libgtkmm-3.0-dev 3.22.0-1 / usr / include / gtkmm-3.0 / gtkmm / widget.h

// Generated by gmmproc 2.50.0 -- DO NOT MODIFY!
#ifndef _GTKMM_WIDGET_H
#define _GTKMM_WIDGET_H

#include <gtkmmconfig.h>


#include <glibmm/ustring.h>
#include <sigc++/sigc++.h>

/* Copyright (C) 2002, 2003 The gtkmm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */


#include <vector>

#include <pangomm/context.h>
#include <pangomm/layout.h>

#ifdef GTKMM_ATKMM_ENABLED
#include <atkmm/object.h>
#include <atkmm/implementor.h>
#endif //GTKMM_ATKMM_ENABLED

#include <gtkmm/object.h>
#include <gtkmm/buildable.h>
#include <gdkmm/event.h>
#include <gdkmm/types.h>
#include <gdkmm/window.h>
#include <gdkmm/dragcontext.h>
#include <gdkmm/pixbuf.h>
#include <gdkmm/screen.h>
#include <gtkmm/enums.h>
#include <gdkmm/display.h>
#include <gtkmm/targetlist.h>
#include <gtkmm/clipboard.h>
#include <gtkmm/requisition.h>
#include <gtkmm/stylecontext.h>
#include <gtkmm/widgetpath.h>
#include <giomm/actiongroup.h>


#ifndef DOXYGEN_SHOULD_SKIP_THIS
extern "C"
{
typedef struct _GtkTargetEntry GtkTargetEntry;
}
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

#ifndef DOXYGEN_SHOULD_SKIP_THIS
using GtkWidget = struct _GtkWidget;
using GtkWidgetClass = struct _GtkWidgetClass;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Gtk
{ class Widget_Class; } // namespace Gtk
#endif //DOXYGEN_SHOULD_SKIP_THIS

namespace Gtk
{


/** @addtogroup gtkmmEnums gtkmm Enums and Flags */

/** 
 *  @var DestDefaults DEST_DEFAULT_MOTION
 * If set for a widget, GTK+, during a drag over this
 * widget will check if the drag matches this widget’s list of possible targets
 * and actions.
 * GTK+ will then call gdk_drag_status() as appropriate.
 * 
 *  @var DestDefaults DEST_DEFAULT_HIGHLIGHT
 * If set for a widget, GTK+ will draw a highlight on
 * this widget as long as a drag is over this widget and the widget drag format
 * and action are acceptable.
 * 
 *  @var DestDefaults DEST_DEFAULT_DROP
 * If set for a widget, when a drop occurs, GTK+ will
 * will check if the drag matches this widget’s list of possible targets and
 * actions. If so, GTK+ will call gtk_drag_get_data() on behalf of the widget.
 * Whether or not the drop is successful, GTK+ will call gtk_drag_finish(). If
 * the action was a move, then if the drag was successful, then <tt>true</tt> will be
 * passed for the @a delete parameter to gtk_drag_finish().
 * 
 *  @var DestDefaults DEST_DEFAULT_ALL
 * If set, specifies that all default actions should
 * be taken.
 * 
 *  @enum DestDefaults
 * 
 * The Gtk::DestDefaults enumeration specifies the various
 * types of action that will be taken on behalf
 * of the user for a drag destination site.
 *
 * @ingroup gtkmmEnums
 * @par Bitwise operators:
 * <tt>%DestDefaults operator|(DestDefaults, DestDefaults)</tt><br>
 * <tt>%DestDefaults operator&(DestDefaults, DestDefaults)</tt><br>
 * <tt>%DestDefaults operator^(DestDefaults, DestDefaults)</tt><br>
 * <tt>%DestDefaults operator~(DestDefaults)</tt><br>
 * <tt>%DestDefaults& operator|=(DestDefaults&, DestDefaults)</tt><br>
 * <tt>%DestDefaults& operator&=(DestDefaults&, DestDefaults)</tt><br>
 * <tt>%DestDefaults& operator^=(DestDefaults&, DestDefaults)</tt><br>
 */
enum DestDefaults
{
  DEST_DEFAULT_MOTION = 1 << 0,
  DEST_DEFAULT_HIGHLIGHT = 1 << 1,
  DEST_DEFAULT_DROP = 1 << 2,
  DEST_DEFAULT_ALL = 0x07
};

/** @ingroup gtkmmEnums */
inline DestDefaults operator|(DestDefaults lhs, DestDefaults rhs)
  { return static_cast<DestDefaults>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs)); }

/** @ingroup gtkmmEnums */
inline DestDefaults operator&(DestDefaults lhs, DestDefaults rhs)
  { return static_cast<DestDefaults>(static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs)); }

/** @ingroup gtkmmEnums */
inline DestDefaults operator^(DestDefaults lhs, DestDefaults rhs)
  { return static_cast<DestDefaults>(static_cast<unsigned>(lhs) ^ static_cast<unsigned>(rhs)); }

/** @ingroup gtkmmEnums */
inline DestDefaults operator~(DestDefaults flags)
  { return static_cast<DestDefaults>(~static_cast<unsigned>(flags)); }

/** @ingroup gtkmmEnums */
inline DestDefaults& operator|=(DestDefaults& lhs, DestDefaults rhs)
  { return (lhs = static_cast<DestDefaults>(static_cast<unsigned>(lhs) | static_cast<unsigned>(rhs))); }

/** @ingroup gtkmmEnums */
inline DestDefaults& operator&=(DestDefaults& lhs, DestDefaults rhs)
  { return (lhs = static_cast<DestDefaults>(static_cast<unsigned>(lhs) & static_cast<unsigned>(rhs))); }

/** @ingroup gtkmmEnums */
inline DestDefaults& operator^=(DestDefaults& lhs, DestDefaults rhs)
  { return (lhs = static_cast<DestDefaults>(static_cast<unsigned>(lhs) ^ static_cast<unsigned>(rhs))); }

} // namespace Gtk

#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class Value<Gtk::DestDefaults> : public Glib::Value_Flags<Gtk::DestDefaults>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

namespace Gtk
{

/** 
 *  @var WidgetHelpType WIDGET_HELP_TOOLTIP
 * Tooltip.
 * 
 *  @var WidgetHelpType WIDGET_HELP_WHATS_THIS
 * What’s this.
 * 
 *  @enum WidgetHelpType
 * 
 * Kinds of widget-specific help. Used by the signal_show_help() signal.
 *
 * @ingroup gtkmmEnums
 */
enum WidgetHelpType
{
  WIDGET_HELP_TOOLTIP,
  WIDGET_HELP_WHATS_THIS
};

} // namespace Gtk

#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class Value<Gtk::WidgetHelpType> : public Glib::Value_Enum<Gtk::WidgetHelpType>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

namespace Gtk
{

/** 
 *  @var DragResult DRAG_RESULT_SUCCESS
 * The drag operation was successful.
 * 
 *  @var DragResult DRAG_RESULT_NO_TARGET
 * No suitable drag target.
 * 
 *  @var DragResult DRAG_RESULT_USER_CANCELLED
 * The user cancelled the drag operation.
 * 
 *  @var DragResult DRAG_RESULT_TIMEOUT_EXPIRED
 * The drag operation timed out.
 * 
 *  @var DragResult DRAG_RESULT_GRAB_BROKEN
 * The pointer or keyboard grab used
 * for the drag operation was broken.
 * 
 *  @var DragResult DRAG_RESULT_ERROR
 * The drag operation failed due to some
 * unspecified error.
 * 
 *  @enum DragResult
 * 
 * Gives an indication why a drag operation failed.
 * The value can by obtained by connecting to the
 * Gtk::Widget::signal_drag_failed() signal.
 *
 * @ingroup gtkmmEnums
 */
enum DragResult
{
  DRAG_RESULT_SUCCESS,
  DRAG_RESULT_NO_TARGET,
  DRAG_RESULT_USER_CANCELLED,
  DRAG_RESULT_TIMEOUT_EXPIRED,
  DRAG_RESULT_GRAB_BROKEN,
  DRAG_RESULT_ERROR
};

} // namespace Gtk

#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class Value<Gtk::DragResult> : public Glib::Value_Enum<Gtk::DragResult>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

namespace Gtk
{


class Action;
class Style;
class AccelGroup;
class Adjustment;
class Window;
class Container;
class Settings;
class Tooltip;
class StockID; //deprecated.

// Gtk::Allocation is a typedef of Gdk::Rectangle because GtkAllocation is
// a typedef of GdkRectangle.
typedef Gdk::Rectangle Allocation;

/** @defgroup Widgets Widgets
 */

//TODO: Deal with the GtkObject->GObject change:
/** Abstract Widget (Base class for all widgets)
 *
 * As the base class of all widgets this contains all of the properties
 * and methods common to all widgets.  It is an abstract class that
 * can not be instantiated.
 *
 * Important part of widgets are the *_event signals and virtual methods
 * that every widget have. Those are events coming directly from gdk and
 * thus also from XLib. By overriding those virtual methods you can
 * trap everything a widget can ever do.
 * In order to capture events from a widget, the event mask must
 * first be set with ().
 *
 * Only widgets with a Gdk::Window on the server side are allowed to
 * capture events.  Widgets in the Gtk::Misc group for example lack
 * a Gdk::Window.
 */

class Widget
: public Object,
  public Buildable
#ifdef GTKMM_ATKMM_ENABLED
  ,public Atk::Implementor
#endif //GTKMM_ATKMM_ENABLED
{
  public:
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  typedef Widget CppObjectType;
  typedef Widget_Class CppClassType;
  typedef GtkWidget BaseObjectType;
  typedef GtkWidgetClass BaseClassType;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

  Widget(Widget&& src) noexcept;
  Widget& operator=(Widget&& src) noexcept;

  // noncopyable
  Widget(const Widget&) = delete;
  Widget& operator=(const Widget&) = delete;

  /** Destroys the widget. The widget will be automatically removed from the parent container.
   */
  ~Widget() noexcept override;

#ifndef DOXYGEN_SHOULD_SKIP_THIS

private:
  friend class Widget_Class;
  static CppClassType widget_class_;

protected:
  explicit Widget(const Glib::ConstructParams& construct_params);
  explicit Widget(GtkWidget* castitem);

#endif /* DOXYGEN_SHOULD_SKIP_THIS */

public:

  /** Get the GType for this class, for use with the underlying GObject type system.
   */
  static GType get_type()      G_GNUC_CONST;

#ifndef DOXYGEN_SHOULD_SKIP_THIS


  static GType get_base_type() G_GNUC_CONST;
#endif

  ///Provides access to the underlying C GtkObject.
  GtkWidget*       gobj()       { return reinterpret_cast<GtkWidget*>(gobject_); }

  ///Provides access to the underlying C GtkObject.
  const GtkWidget* gobj() const { return reinterpret_cast<GtkWidget*>(gobject_); }


public:
  //C++ methods used to invoke GTK+ virtual functions:

protected:
  //GTK+ Virtual Functions (override these to change behaviour):

  //Default Signal Handlers::
  /// This is a default handler for the signal signal_show().
  virtual void on_show();
  /// This is a default handler for the signal signal_hide().
  virtual void on_hide();
  /// This is a default handler for the signal signal_map().
  virtual void on_map();
  /// This is a default handler for the signal signal_unmap().
  virtual void on_unmap();
  /// This is a default handler for the signal signal_realize().
  virtual void on_realize();
  /// This is a default handler for the signal signal_unrealize().
  virtual void on_unrealize();
  /// This is a default handler for the signal signal_size_allocate().
  virtual void on_size_allocate(Allocation& allocation);
  /// This is a default handler for the signal signal_state_changed().
  virtual void on_state_changed(Gtk::StateType previous_state);
  /// This is a default handler for the signal signal_parent_changed().
  virtual void on_parent_changed(Widget* previous_parent);
  /// This is a default handler for the signal signal_hierarchy_changed().
  virtual void on_hierarchy_changed(Widget* previous_toplevel);
  /// This is a default handler for the signal signal_style_updated().
  virtual void on_style_updated();
  /// This is a default handler for the signal signal_direction_changed().
  virtual void on_direction_changed(TextDirection direction);
  /// This is a default handler for the signal signal_grab_notify().
  virtual void on_grab_notify(bool was_grabbed);
  /// This is a default handler for the signal signal_child_notify().
  virtual void on_child_notify(GParamSpec* pspec);
  /// This is a default handler for the signal signal_mnemonic_activate().
  virtual bool on_mnemonic_activate(bool group_cycling);
  /// This is a default handler for the signal signal_grab_focus().
  virtual void on_grab_focus();
  /// This is a default handler for the signal signal_focus().
  virtual bool on_focus(DirectionType direction);
  /// This is a default handler for the signal signal_event().
  virtual bool on_event(GdkEvent* gdk_event);
  /// This is a default handler for the signal signal_button_press_event().
  virtual bool on_button_press_event(GdkEventButton* button_event);
  /// This is a default handler for the signal signal_button_release_event().
  virtual bool on_button_release_event(GdkEventButton* release_event);
  /// This is a default handler for the signal signal_scroll_event().
  virtual bool on_scroll_event(GdkEventScroll* scroll_event);
  /// This is a default handler for the signal signal_motion_notify_event().
  virtual bool on_motion_notify_event(GdkEventMotion* motion_event);
  /// This is a default handler for the signal signal_delete_event().
  virtual bool on_delete_event(GdkEventAny* any_event);
  /// This is a default handler for the signal signal_draw().
  virtual bool on_draw(const ::Cairo::RefPtr< ::Cairo::Context>& cr);
  /// This is a default handler for the signal signal_key_press_event().
  virtual bool on_key_press_event(GdkEventKey* key_event);
  /// This is a default handler for the signal signal_key_release_event().
  virtual bool on_key_release_event(GdkEventKey* key_event);
  /// This is a default handler for the signal signal_enter_notify_event().
  virtual bool on_enter_notify_event(GdkEventCrossing* crossing_event);
  /// This is a default handler for the signal signal_leave_notify_event().
  virtual bool on_leave_notify_event(GdkEventCrossing* crossing_event);
  /// This is a default handler for the signal signal_configure_event().
  virtual bool on_configure_event(GdkEventConfigure* configure_event);
  /// This is a default handler for the signal signal_focus_in_event().
  virtual bool on_focus_in_event(GdkEventFocus* focus_event);
  /// This is a default handler for the signal signal_focus_out_event().
  virtual bool on_focus_out_event(GdkEventFocus* gdk_event);
  /// This is a default handler for the signal signal_map_event().
  virtual bool on_map_event(GdkEventAny* any_event);
  /// This is a default handler for the signal signal_unmap_event().
  virtual bool on_unmap_event(GdkEventAny* any_event);
  /// This is a default handler for the signal signal_property_notify_event().
  virtual bool on_property_notify_event(GdkEventProperty* property_event);
  /// This is a default handler for the signal signal_selection_clear_event().
  virtual bool on_selection_clear_event(GdkEventSelection* selection_event);
  /// This is a default handler for the signal signal_selection_request_event().
  virtual bool on_selection_request_event(GdkEventSelection* selection_event);
  /// This is a default handler for the signal signal_selection_notify_event().
  virtual bool on_selection_notify_event(GdkEventSelection* selection_event);
  /// This is a default handler for the signal signal_proximity_in_event().
  virtual bool on_proximity_in_event(GdkEventProximity* proximity_event);
  /// This is a default handler for the signal signal_proximity_out_event().
  virtual bool on_proximity_out_event(GdkEventProximity* proximity_event);
  /// This is a default handler for the signal signal_visibility_notify_event().
  virtual bool on_visibility_notify_event(GdkEventVisibility* visibility_event);
  /// This is a default handler for the signal signal_window_state_event().
  virtual bool on_window_state_event(GdkEventWindowState* window_state_event);
  /// This is a default handler for the signal signal_selection_get().
  virtual void on_selection_get(SelectionData& selection_data, guint info, guint time);
  /// This is a default handler for the signal signal_selection_received().
  virtual void on_selection_received(const SelectionData& selection_data, guint time);
  /// This is a default handler for the signal signal_drag_begin().
  virtual void on_drag_begin(const Glib::RefPtr<Gdk::DragContext>& context);
  /// This is a default handler for the signal signal_drag_end().
  virtual void on_drag_end(const Glib::RefPtr<Gdk::DragContext>& context);
  /// This is a default handler for the signal signal_drag_data_get().
  virtual void on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>& context, SelectionData& selection_data, guint info, guint time);
  /// This is a default handler for the signal signal_drag_data_delete().
  virtual void on_drag_data_delete(const Glib::RefPtr<Gdk::DragContext>& context);
  /// This is a default handler for the signal signal_drag_leave().
  virtual void on_drag_leave(const Glib::RefPtr<Gdk::DragContext>& context, guint time);
  /// This is a default handler for the signal signal_drag_motion().
  virtual bool on_drag_motion(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time);
  /// This is a default handler for the signal signal_drag_drop().
  virtual bool on_drag_drop(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time);
  /// This is a default handler for the signal signal_drag_data_received().
  virtual void on_drag_data_received(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, const SelectionData& selection_data, guint info, guint time);
  /// This is a default handler for the signal signal_screen_changed().
  virtual void on_screen_changed(const Glib::RefPtr<Gdk::Screen>& previous_screen);


private:

  
public:
  friend class Main;
  
  
  /** Flags a widget to be displayed. Any widget that isn’t shown will
   * not appear on the screen. If you want to show all the widgets in a
   * container, it’s easier to call show_all() on the
   * container, instead of individually showing the widgets.
   * 
   * Remember that you have to show the containers containing a widget,
   * in addition to the widget itself, before it will appear onscreen.
   * 
   * When a toplevel container is shown, it is immediately realized and
   * mapped; other shown widgets are realized and mapped when their
   * toplevel container is realized and mapped.
   */
  void show();
  
  /** Shows a widget. If the widget is an unmapped toplevel widget
   * (i.e. a Gtk::Window that has not yet been shown), enter the main
   * loop and wait for the window to actually be mapped. Be careful;
   * because the main loop is running, anything can happen during
   * this function.
   */
  void show_now();
  
  /** Reverses the effects of show(), causing the widget to be
   * hidden (invisible to the user).
   */
  void hide();

  
  /** Recursively shows a widget, and any child widgets (if the widget is
   * a container).
   */
  void show_all();

/* QUEUE DRAWS */

  
  /** Equivalent to calling queue_draw_area() for the
   * entire area of a widget.
   */
  void queue_draw();
  
  /** Convenience function that calls queue_draw_region() on
   * the region created from the given coordinates.
   * 
   * The region here is specified in widget coordinates.
   * Widget coordinates are a bit odd; for historical reasons, they are
   * defined as @a widget->window coordinates for widgets that return <tt>true</tt> for
   * get_has_window(), and are relative to @a widget->allocation.x,
   *  @a widget->allocation.y otherwise.
   * 
   *  @a width or @a height may be 0, in this case this function does
   * nothing. Negative values for @a width and @a height are not allowed.
   * 
   * @param x X coordinate of upper-left corner of rectangle to redraw.
   * @param y Y coordinate of upper-left corner of rectangle to redraw.
   * @param width Width of region to draw.
   * @param height Height of region to draw.
   */
  void queue_draw_area(int x, int y, int width, int height);
  
  /** Invalidates the area of @a widget defined by @a region by calling
   * gdk_window_invalidate_region() on the widget’s window and all its
   * child windows. Once the main loop becomes idle (after the current
   * batch of events has been processed, roughly), the window will
   * receive expose events for the union of all regions that have been
   * invalidated.
   * 
   * Normally you would only use this function in widget
   * implementations. You might also use it to schedule a redraw of a
   * Gtk::DrawingArea or some portion thereof.
   * 
   * @newin{3,0}
   * 
   * @param region Region to draw.
   */
  void queue_draw_region(const ::Cairo::RefPtr<const ::Cairo::Region>& region);
  
  /** This function is only for use in widget implementations.
   * Flags a widget to have its size renegotiated; should
   * be called when a widget for some reason has a new size request.
   * For example, when you change the text in a Gtk::Label, Gtk::Label
   * queues a resize to ensure there’s enough space for the new text.
   * 
   * Note that you cannot call queue_resize() on a widget
   * from inside its implementation of the GtkWidgetClass::size_allocate 
   * virtual method. Calls to queue_resize() from inside
   * GtkWidgetClass::size_allocate will be silently ignored.
   */
  void queue_resize();
  
  /** This function is only for use in widget implementations.
   * 
   * Flags the widget for a rerun of the GtkWidgetClass::size_allocate
   * function. Use this function instead of queue_resize()
   * when the @a widget's size request didn't change but it wants to
   * reposition its contents.
   * 
   * An example user of this function is set_halign().
   * 
   * @newin{3,20}
   */
  void queue_allocate();

  
  /** This function is only used by Gtk::Container subclasses, to assign a size
   * and position to their child widgets.
   * 
   * In this function, the allocation may be adjusted. It will be forced
   * to a 1x1 minimum size, and the adjust_size_allocation virtual
   * method on the child will be used to adjust the allocation. Standard
   * adjustments include removing the widget’s margins, and applying the
   * widget’s Gtk::Widget::property_halign() and Gtk::Widget::property_valign() properties.
   * 
   * For baseline support in containers you need to use size_allocate_with_baseline()
   * instead.
   * 
   * @param allocation Position and size to be allocated to @a widget.
   */
  void size_allocate(const Allocation& allocation);

  
  /** This function is only used by Gtk::Container subclasses, to assign a size,
   * position and (optionally) baseline to their child widgets.
   * 
   * In this function, the allocation and baseline may be adjusted. It
   * will be forced to a 1x1 minimum size, and the
   * adjust_size_allocation virtual and adjust_baseline_allocation
   * methods on the child will be used to adjust the allocation and
   * baseline. Standard adjustments include removing the widget's
   * margins, and applying the widget’s Gtk::Widget::property_halign() and
   * Gtk::Widget::property_valign() properties.
   * 
   * If the child widget does not have a valign of Gtk::ALIGN_BASELINE the
   * baseline argument is ignored and -1 is used instead.
   * 
   * @newin{3,10}
   * 
   * @param allocation Position and size to be allocated to @a widget.
   * @param baseline The baseline of the child, or -1.
   */
  void size_allocate(const Allocation& allocation, int baseline);

   //deprecated

  
  /** Gets whether the widget prefers a height-for-width layout
   * or a width-for-height layout.
   * 
   * Gtk::Bin widgets generally propagate the preference of
   * their child, container widgets need to request something either in
   * context of their children or in context of their allocation
   * capabilities.
   * 
   * @newin{3,0}
   * 
   * @return The Gtk::SizeRequestMode preferred by @a widget.
   */
  SizeRequestMode get_request_mode() const;
  
  /** Retrieves a widget’s initial minimum and natural width.
   * 
   * This call is specific to height-for-width requests.
   * 
   * The returned request will be modified by the
   * GtkWidgetClass::adjust_size_request virtual method and by any
   * Gtk::SizeGroups that have been applied. That is, the returned request
   * is the one that should be used for layout, not necessarily the one
   * returned by the widget itself.
   * 
   * @newin{3,0}
   * 
   * @param minimum_width Location to store the minimum width, or <tt>nullptr</tt>.
   * @param natural_width Location to store the natural width, or <tt>nullptr</tt>.
   */
  void get_preferred_width(int& minimum_width, int& natural_width) const;
  
  /** Retrieves a widget’s minimum and natural height if it would be given
   * the specified @a width.
   * 
   * The returned request will be modified by the
   * GtkWidgetClass::adjust_size_request virtual method and by any
   * Gtk::SizeGroups that have been applied. That is, the returned request
   * is the one that should be used for layout, not necessarily the one
   * returned by the widget itself.
   * 
   * @newin{3,0}
   * 
   * @param width The width which is available for allocation.
   * @param minimum_height Location for storing the minimum height, or <tt>nullptr</tt>.
   * @param natural_height Location for storing the natural height, or <tt>nullptr</tt>.
   */
  void get_preferred_height_for_width(int width, int& minimum_height, int& natural_height) const;
  
  /** Retrieves a widget’s minimum and natural height and the corresponding baselines if it would be given
   * the specified @a width, or the default height if @a width is -1. The baselines may be -1 which means
   * that no baseline is requested for this widget.
   * 
   * The returned request will be modified by the
   * GtkWidgetClass::adjust_size_request and GtkWidgetClass::adjust_baseline_request virtual methods
   * and by any Gtk::SizeGroups that have been applied. That is, the returned request
   * is the one that should be used for layout, not necessarily the one
   * returned by the widget itself.
   * 
   * @newin{3,10}
   * 
   * @param width The width which is available for allocation, or -1 if none.
   * @param minimum_height Location for storing the minimum height, or <tt>nullptr</tt>.
   * @param natural_height Location for storing the natural height, or <tt>nullptr</tt>.
   * @param minimum_baseline Location for storing the baseline for the minimum height, or <tt>nullptr</tt>.
   * @param natural_baseline Location for storing the baseline for the natural height, or <tt>nullptr</tt>.
   */
  void get_preferred_height_for_width(int width, int& minimum_height, int& natural_height, int& minimum_baseline, int& natural_baseline) const;
  
  /** Retrieves a widget’s initial minimum and natural height.
   * 
   * This call is specific to width-for-height requests.
   * 
   * The returned request will be modified by the
   * GtkWidgetClass::adjust_size_request virtual method and by any
   * Gtk::SizeGroups that have been applied. That is, the returned request
   * is the one that should be used for layout, not necessarily the one
   * returned by the widget itself.
   * 
   * @newin{3,0}
   * 
   * @param minimum_height Location to store the minimum height, or <tt>nullptr</tt>.
   * @param natural_height Location to store the natural height, or <tt>nullptr</tt>.
   */
  void get_preferred_height(int& minimum_height, int& natural_height) const;
  
  /** Retrieves a widget’s minimum and natural width if it would be given
   * the specified @a height.
   * 
   * The returned request will be modified by the
   * GtkWidgetClass::adjust_size_request virtual method and by any
   * Gtk::SizeGroups that have been applied. That is, the returned request
   * is the one that should be used for layout, not necessarily the one
   * returned by the widget itself.
   * 
   * @newin{3,0}
   * 
   * @param height The height which is available for allocation.
   * @param minimum_width Location for storing the minimum width, or <tt>nullptr</tt>.
   * @param natural_width Location for storing the natural width, or <tt>nullptr</tt>.
   */
  void get_preferred_width_for_height(int height, int& minimum_width, int& natural_width) const;
  
  /** Retrieves the minimum and natural size of a widget, taking
   * into account the widget’s preference for height-for-width management.
   * 
   * This is used to retrieve a suitable size by container widgets which do
   * not impose any restrictions on the child placement. It can be used
   * to deduce toplevel window and menu sizes as well as child widgets in
   * free-form containers such as GtkLayout.
   * 
   * Handle with care. Note that the natural height of a height-for-width
   * widget will generally be a smaller size than the minimum height, since the required
   * height for the natural width is generally smaller than the required height for
   * the minimum width.
   * 
   * Use get_preferred_height_and_baseline_for_width() if you want to support
   * baseline alignment.
   * 
   * @newin{3,0}
   * 
   * @param minimum_size Location for storing the minimum size, or <tt>nullptr</tt>.
   * @param natural_size Location for storing the natural size, or <tt>nullptr</tt>.
   */
  void get_preferred_size(Requisition& minimum_size, Requisition& natural_size) const;


  /** Installs an accelerator for this @a widget in @a accel_group that causes
   *  @a accel_signal to be emitted if the accelerator is activated.
   * The @a accel_group needs to be added to the widget’s toplevel via
   * Gtk::Window::add_accel_group(), and the signal must be of type SIGNAL_ACTION.
   * Accelerators added through this function are not user changeable during
   * runtime. If you want to support accelerators that can be changed by the
   * user, use Gtk::AccelMap::add_entry() and set_accel_path() or
   * Gtk::MenuItem::set_accel_path() instead.
   * 
   * @param accel_signal Widget signal to emit on accelerator activation.
   * @param accel_group Accel group for this widget, added to its toplevel.
   * @param accel_key GDK keyval of the accelerator.
   * @param accel_mods Modifier key combination of the accelerator.
   * @param accel_flags Flag accelerators, e.g. Gtk::ACCEL_VISIBLE.
   */
  void add_accelerator(const Glib::ustring& accel_signal, const Glib::RefPtr<AccelGroup>& accel_group, guint accel_key, Gdk::ModifierType accel_mods, AccelFlags accel_flags);

  
  /** Removes an accelerator from @a widget, previously installed with
   * add_accelerator().
   * 
   * @param accel_group Accel group for this widget.
   * @param accel_key GDK keyval of the accelerator.
   * @param accel_mods Modifier key combination of the accelerator.
   * @return Whether an accelerator was installed and could be removed.
   */
  bool remove_accelerator(const Glib::RefPtr<AccelGroup>& accel_group, guint accel_key, Gdk::ModifierType accel_mods);
  
  /** Given an accelerator group, @a accel_group, and an accelerator path,
   *  @a accel_path, sets up an accelerator in @a accel_group so whenever the
   * key binding that is defined for @a accel_path is pressed, @a widget
   * will be activated.  This removes any accelerators (for any
   * accelerator group) installed by previous calls to
   * set_accel_path(). Associating accelerators with
   * paths allows them to be modified by the user and the modifications
   * to be saved for future use. (See Gtk::AccelMap::save().)
   * 
   * This function is a low level function that would most likely
   * be used by a menu creation system like Gtk::UIManager. If you
   * use Gtk::UIManager, setting up accelerator paths will be done
   * automatically.
   * 
   * Even when you you aren’t using Gtk::UIManager, if you only want to
   * set up accelerators on menu items Gtk::MenuItem::set_accel_path()
   * provides a somewhat more convenient interface.
   * 
   * Note that @a accel_path string will be stored in a Quark. Therefore, if you
   * pass a static string, you can save some memory by interning it first with
   * Glib::intern_static_string().
   * 
   * @param accel_path Path used to look up the accelerator.
   * @param accel_group A Gtk::AccelGroup.
   */
  void set_accel_path(const Glib::ustring& accel_path, const Glib::RefPtr<AccelGroup>& accel_group);

  //GList* gtk_widget_list_accel_closures();

  
  /** Emits the Gtk::Widget::signal_mnemonic_activate() signal.
   * 
   * The default handler for this signal activates the @a widget if
   *  @a group_cycling is <tt>false</tt>, and just grabs the focus if @a group_cycling
   * is <tt>true</tt>.
   * 
   * @param group_cycling <tt>true</tt> if there are other widgets with the same mnemonic.
   * @return <tt>true</tt> if the signal has been handled.
   */
  bool mnemonic_activate(bool group_cycling);

  
  //Probably not useful. Too C-specific: _WRAP_METHOD(bool can_activate_accel(guint signal_id) const, gtk_widget_can_activate_accel)

  //TODO: Use C++ type
  
  /** Rarely-used function. This function is used to emit
   * the event signals on a widget (those signals should never
   * be emitted without using this function to do so).
   * If you want to synthesize an event though, don’t use this function;
   * instead, use gtk_main_do_event() so the event will behave as if
   * it were in the event queue. Don’t synthesize expose events; instead,
   * use gdk_window_invalidate_rect() to invalidate a region of the
   * window.
   * 
   * @param gdk_event A Gdk::Event.
   * @return Return from the event signal emission (<tt>true</tt> if
   * the event was handled).
   */
  bool event(GdkEvent* gdk_event);
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Very rarely-used function. This function is used to emit
   * an expose event on a widget. This function is not normally used
   * directly. The only time it is used is when propagating an expose
   * event to a windowless child widget (get_has_window() is <tt>false</tt>),
   * and that is normally done using Gtk::Container::propagate_draw().
   * 
   * If you want to force an area of a window to be redrawn,
   * use gdk_window_invalidate_rect() or gdk_window_invalidate_region().
   * To cause the redraw to be done immediately, follow that call
   * with a call to gdk_window_process_updates().
   * 
   * Deprecated: 3.22: Application and widget code should not handle
   * expose events directly; invalidation should use the Gtk::Widget
   * API, and drawing should only happen inside Gtk::Widget::signal_draw()
   * implementations
   * 
   * @deprecated %Application and widget code should not handle expose events directly; invalidation should use the Gtk::Widget API, and drawing should only happen inside signal_draw() implementations.
   * 
   * @param gdk_event A expose Gdk::Event.
   * @return Return from the event signal emission (<tt>true</tt> if
   * the event was handled).
   */
  int send_expose(GdkEvent* gdk_event);
#endif // GTKMM_DISABLE_DEPRECATED


  /** Sends the focus change @a gdk_event to @a widget
   * 
   * This function is not meant to be used by applications. The only time it
   * should be used is when it is necessary for a Gtk::Widget to assign focus
   * to a widget that is semantically owned by the first widget even though
   * it’s not a direct child - for instance, a search entry in a floating
   * window similar to the quick search in Gtk::TreeView.
   * 
   * An example of its usage is:
   * 
   * 
   * [C example ellipted]
   * 
   * @newin{2,20}
   * 
   * @param gdk_event A Gdk::Event of type GDK_FOCUS_CHANGE.
   * @return The return value from the event signal emission: <tt>true</tt>
   * if the event was handled, and <tt>false</tt> otherwise.
   */
  bool send_focus_change(GdkEvent* gdk_event);
  
  /** For widgets that can be “activated” (buttons, menu items, etc.)
   * this function activates them. Activation is what happens when you
   * press Enter on a widget during key navigation. If @a widget isn't
   * activatable, the function returns <tt>false</tt>.
   * 
   * @return <tt>true</tt> if the widget was activatable.
   */
  bool activate();

  //TODO: When we can break ABI/API, change to void reparent(Container& new_parent).
  // gtk_widget_reparent() is deprecated, but we want to keep Gtk::Widget::reparent().
  /** Moves a widget from one Gtk::Container to another, handling reference
   * count issues to avoid destroying the widget.
   *
   * @param new_parent A Gtk::Container to move the widget into.
   */
  void reparent(Widget& new_parent);
  

  bool intersect(const Gdk::Rectangle& area) const;
  
  /** Computes the intersection of a @a widget’s area and @a area, storing
   * the intersection in @a intersection, and returns <tt>true</tt> if there was
   * an intersection.  @a intersection may be <tt>nullptr</tt> if you’re only
   * interested in whether there was an intersection.
   * 
   * @param area A rectangle.
   * @param intersection Rectangle to store intersection of @a widget and @a area.
   * @return <tt>true</tt> if there was an intersection.
   */
  bool intersect(const Gdk::Rectangle& area, Gdk::Rectangle& intersection) const;

 
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Computes the intersection of a @a widget’s area and @a region, returning
   * the intersection. The result may be empty, use cairo_region_is_empty() to
   * check.
   * 
   * Deprecated: 3.14: Use get_allocation() and
   * cairo_region_intersect_rectangle() to get the same behavior.
   * 
   * @deprecated Use get_allocation() and Cairo::Region::intersect(const Cairo::RectangleInt&) to get the same behavior.
   * 
   * @param region A #cairo_region_t, in the same coordinate system as
   *  @a widget->allocation. That is, relative to @a widget->window
   * for widgets which return <tt>false</tt> from get_has_window();
   * relative to the parent window of @a widget->window otherwise.
   * @return A newly allocated region holding the intersection of @a widget
   * and @a region.
   */
  ::Cairo::RefPtr< ::Cairo::Region> region_intersect(const ::Cairo::RefPtr< ::Cairo::Region>& region) const;
#endif // GTKMM_DISABLE_DEPRECATED


  /** Stops emission of Gtk::Widget::signal_child_notify() signals on @a widget. The
   * signals are queued until thaw_child_notify() is called
   * on @a widget.
   * 
   * This is the analogue of Glib::object_freeze_notify() for child properties.
   */
  void freeze_child_notify();
  
  /** Emits a Gtk::Widget::signal_child_notify() signal for the
   * [child property][child-properties] @a child_property
   * on @a widget.
   * 
   * This is the analogue of Glib::object_notify() for child properties.
   * 
   * Also see Gtk::Container::child_notify().
   * 
   * @param child_property The name of a child property installed on the
   * class of @a widget’s parent.
   */
  void child_notify(const Glib::ustring& child_property);
  
  /** Reverts the effect of a previous call to freeze_child_notify().
   * This causes all queued Gtk::Widget::signal_child_notify() signals on @a widget to be
   * emitted.
   */
  void thaw_child_notify();

  
  /** Specifies whether @a widget can own the input focus. See
   * grab_focus() for actually setting the input focus on a
   * widget.
   * 
   * @newin{2,18}
   * 
   * @param can_focus Whether or not @a widget can own the input focus.
   */
  void set_can_focus(bool can_focus =  true);
  
  /** Determines whether @a widget can own the input focus. See
   * set_can_focus().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget can own the input focus, <tt>false</tt> otherwise.
   */
  bool get_can_focus() const;
  
  /** Determines if the widget has the global input focus. See
   * is_focus() for the difference between having the global
   * input focus, and only having the focus within a toplevel.
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if the widget has the global input focus.
   */
  bool has_focus() const;

  
  /** Determines if the widget is the focus widget within its
   * toplevel. (This does not mean that the Gtk::Widget::property_has_focus() property is
   * necessarily set; Gtk::Widget::property_has_focus() will only be set if the
   * toplevel widget additionally has the global input focus.)
   * 
   * @return <tt>true</tt> if the widget is the focus widget.
   */
  bool is_focus() const;
  
  /** Determines if the widget should show a visible indication that
   * it has the global input focus. This is a convenience function for
   * use in signal_draw() handlers that takes into account whether focus
   * indication should currently be shown in the toplevel window of
   *  @a widget. See Gtk::Window::get_focus_visible() for more information
   * about focus indication.
   * 
   * To find out if the widget has the global input focus, use
   * has_focus().
   * 
   * @newin{3,2}
   * 
   * @return <tt>true</tt> if the widget should display a “focus rectangle”.
   */
  bool has_visible_focus() const;
  
  /** Causes @a widget to have the keyboard focus for the Gtk::Window it's
   * inside. @a widget must be a focusable widget, such as a Gtk::Entry;
   * something like Gtk::Frame won’t work.
   * 
   * More precisely, it must have the Gtk::CAN_FOCUS flag set. Use
   * set_can_focus() to modify that flag.
   * 
   * The widget also needs to be realized and mapped. This is indicated by the
   * related signals. Grabbing the focus immediately after creating the widget
   * will likely fail and cause critical warnings.
   */
  void grab_focus();
  
  /** Sets whether the widget should grab focus when it is clicked with the mouse.
   * Making mouse clicks not grab focus is useful in places like toolbars where
   * you don’t want the keyboard focus removed from the main area of the
   * application.
   * 
   * @newin{3,20}
   * 
   * @param focus_on_click Whether the widget should grab focus when clicked with the mouse.
   */
  void set_focus_on_click(bool focus_on_click =  true);
  
  /** Returns whether the widget should grab focus when it is clicked with the mouse.
   * See set_focus_on_click().
   * 
   * @newin{3,20}
   * 
   * @return <tt>true</tt> if the widget should grab focus when it is clicked with
   * the mouse.
   */
  bool get_focus_on_click() const;
  
  /** Specifies whether @a widget can be a default widget. See
   * grab_default() for details about the meaning of
   * “default”.
   * 
   * @newin{2,18}
   * 
   * @param can_default Whether or not @a widget can be a default widget.
   */
  void set_can_default(bool can_default =  true);
  
  /** Determines whether @a widget can be a default widget. See
   * set_can_default().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget can be a default widget, <tt>false</tt> otherwise.
   */
  bool get_can_default() const;
  
  /** Determines whether @a widget is the current default widget within its
   * toplevel. See set_can_default().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget is the current default widget within
   * its toplevel, <tt>false</tt> otherwise.
   */
  bool has_default() const;
  
  /** Causes @a widget to become the default widget. @a widget must be able to be
   * a default widget; typically you would ensure this yourself
   * by calling set_can_default() with a <tt>true</tt> value.
   * The default widget is activated when
   * the user presses Enter in a window. Default widgets must be
   * activatable, that is, activate() should affect them. Note
   * that Gtk::Entry widgets require the “activates-default” property
   * set to <tt>true</tt> before they activate the default widget when Enter
   * is pressed and the Gtk::Entry is focused.
   */
  void grab_default();
  
  /** Specifies whether @a widget will be treated as the default widget
   * within its toplevel when it has the focus, even if another widget
   * is the default.
   * 
   * See grab_default() for details about the meaning of
   * “default”.
   * 
   * @newin{2,18}
   * 
   * @param receives_default Whether or not @a widget can be a default widget.
   */
  void set_receives_default(bool receives_default =  true);
  
  /** Determines whether @a widget is always treated as the default widget
   * within its toplevel when it has the focus, even if another widget
   * is the default.
   * 
   * See set_receives_default().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget acts as the default widget when focused,
   * <tt>false</tt> otherwise.
   */
  bool get_receives_default() const;
  
  /** Determines whether the widget is currently grabbing events, so it
   * is the only widget receiving input events (keyboard and mouse).
   * 
   * See also gtk_grab_add().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if the widget is in the grab_widgets stack.
   */
  bool has_grab() const;
  
  /** Returns <tt>true</tt> if @a device has been shadowed by a GTK+
   * device grab on another widget, so it would stop sending
   * events to @a widget. This may be used in the
   * Gtk::Widget::signal_grab_notify() signal to check for specific
   * devices. See gtk_device_grab_add().
   * 
   * @newin{3,0}
   * 
   * @param device A Gdk::Device.
   * @return <tt>true</tt> if there is an ongoing grab on @a device
   * by another Gtk::Widget than @a widget.
   */
  bool device_is_shadowed(const Glib::RefPtr<const Gdk::Device>& device);


  /** Block events to everything else than this widget and its children. This
   * way you can get modal behaviour (usually not recommended). One practical
   * example could be when implementing a key-binding widget that needs
   * exclusive access to the key combination that the user presses next.
   *
   * Calls to add_modal_grab should be paired with calls to remove_modal_grab.
   */
  void add_modal_grab();

  /** Remove the modal grab of the widget in case it was previously grabbed.
   */
  void remove_modal_grab();

  /** Retrieve the widget which is currently grabbing all events.
   */
  static Widget* get_current_modal_grab();

  
  /** Widgets can be named, which allows you to refer to them from a
   * CSS file. You can apply a style to widgets with a particular name
   * in the CSS file. See the documentation for the CSS syntax (on the
   * same page as the docs for Gtk::StyleContext).
   * 
   * Note that the CSS syntax has certain special characters to delimit
   * and represent elements in a selector (period, #, >, *...), so using
   * these will make your widget impossible to match by name. Any combination
   * of alphanumeric symbols, dashes and underscores will suffice.
   * 
   * @param name Name for the widget.
   */
  void set_name(const Glib::ustring& name);
  void unset_name();
  
  /** Retrieves the name of a widget. See set_name() for the
   * significance of widget names.
   * 
   * @return Name of the widget. This string is owned by GTK+ and
   * should not be modified or freed.
   */
  Glib::ustring get_name() const;

  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** This function is for use in widget implementations. Sets the state
   * of a widget (insensitive, prelighted, etc.) Usually you should set
   * the state using wrapper functions such as set_sensitive().
   * 
   * Deprecated: 3.0: Use set_state_flags() instead.
   * 
   * @deprecated Use set_state_flags() instead.
   * 
   * @param state New state for @a widget.
   */
  void set_state(StateType state);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Returns the widget’s state. See set_state().
   * 
   * @newin{2,18}
   * 
   * Deprecated: 3.0: Use get_state_flags() instead.
   * 
   * @deprecated Use get_state_flags() instead.
   * 
   * @return The state of @a widget.
   */
  StateType get_state() const;
#endif // GTKMM_DISABLE_DEPRECATED


  /** This function is for use in widget implementations. Turns on flag
   * values in the current widget state (insensitive, prelighted, etc.).
   * 
   * This function accepts the values Gtk::STATE_FLAG_DIR_LTR and
   * Gtk::STATE_FLAG_DIR_RTL but ignores them. If you want to set the widget's
   * direction, use set_direction().
   * 
   * It is worth mentioning that any other state than Gtk::STATE_FLAG_INSENSITIVE,
   * will be propagated down to all non-internal children if @a widget is a
   * Gtk::Container, while Gtk::STATE_FLAG_INSENSITIVE itself will be propagated
   * down to all Gtk::Container children by different means than turning on the
   * state flag down the hierarchy, both get_state_flags() and
   * is_sensitive() will make use of these.
   * 
   * @newin{3,0}
   * 
   * @param flags State flags to turn on.
   * @param clear Whether to clear state before turning on @a flags.
   */
  void set_state_flags(StateFlags flags, bool clear =  true);
  
  /** This function is for use in widget implementations. Turns off flag
   * values for the current widget state (insensitive, prelighted, etc.).
   * See set_state_flags().
   * 
   * @newin{3,0}
   * 
   * @param flags State flags to turn off.
   */
  void unset_state_flags(StateFlags flags);
  
  /** Returns the widget state as a flag set. It is worth mentioning
   * that the effective Gtk::STATE_FLAG_INSENSITIVE state will be
   * returned, that is, also based on parent insensitivity, even if
   *  @a widget itself is sensitive.
   * 
   * Also note that if you are looking for a way to obtain the
   * Gtk::StateFlags to pass to a Gtk::StyleContext method, you
   * should look at Gtk::StyleContext::get_state().
   * 
   * @newin{3,0}
   * 
   * @return The state flags for widget.
   */
  StateFlags get_state_flags() const;

  
  /** Sets the sensitivity of a widget. A widget is sensitive if the user
   * can interact with it. Insensitive widgets are “grayed out” and the
   * user can’t interact with them. Insensitive widgets are known as
   * “inactive”, “disabled”, or “ghosted” in some other toolkits.
   * 
   * @param sensitive <tt>true</tt> to make the widget sensitive.
   */
  void set_sensitive(bool sensitive =  true);
  
  /** Returns the widget’s sensitivity (in the sense of returning
   * the value that has been set using set_sensitive()).
   * 
   * The effective sensitivity of a widget is however determined by both its
   * own and its parent widget’s sensitivity. See is_sensitive().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if the widget is sensitive.
   */
  bool get_sensitive() const;
  
  /** Returns the widget’s effective sensitivity, which means
   * it is sensitive itself and also its parent widget is sensitive
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if the widget is effectively sensitive.
   */
  bool is_sensitive() const;
  
  /** Sets the visibility state of @a widget. Note that setting this to
   * <tt>true</tt> doesn’t mean the widget is actually viewable, see
   * get_visible().
   * 
   * This function simply calls show() or hide()
   * but is nicer to use when the visibility of the widget depends on
   * some condition.
   * 
   * @newin{2,18}
   * 
   * @param visible Whether the widget should be shown or not.
   */
  void set_visible(bool visible =  true);
  
  /** Determines whether the widget is visible. If you want to
   * take into account whether the widget’s parent is also marked as
   * visible, use is_visible() instead.
   * 
   * This function does not check if the widget is obscured in any way.
   * 
   * See set_visible().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if the widget is visible.
   */
  bool get_visible() const;
  
  /** Determines whether the widget and all its parents are marked as
   * visible.
   * 
   * This function does not check if the widget is obscured in any way.
   * 
   * See also get_visible() and set_visible()
   * 
   * @newin{3,8}
   * 
   * @return <tt>true</tt> if the widget and all its parents are visible.
   */
  bool is_visible() const;
  
  /** Determines whether @a widget has a Gdk::Window of its own. See
   * set_has_window().
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget has a window, <tt>false</tt> otherwise.
   */
  bool get_has_window() const;
  
  /** Determines whether @a widget is a toplevel widget.
   * 
   * Currently only Gtk::Window and Gtk::Invisible (and out-of-process
   * Gtk::Plugs) are toplevel widgets. Toplevel widgets have no parent
   * widget.
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget is a toplevel, <tt>false</tt> otherwise.
   */
  bool get_is_toplevel() const;
  
  /** Determines whether @a widget can be drawn to. A widget can be drawn
   * to if it is mapped and visible.
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if @a widget is drawable, <tt>false</tt> otherwise.
   */
  bool get_is_drawable() const;
  
  /** Determines whether @a widget is realized.
   * 
   * @newin{2,20}
   * 
   * @return <tt>true</tt> if @a widget is realized, <tt>false</tt> otherwise.
   */
  bool get_realized() const;
  
  /** Whether the widget is mapped.
   * 
   * @newin{2,20}
   * 
   * @return <tt>true</tt> if the widget is mapped, <tt>false</tt> otherwise.
   */
  bool get_mapped() const;
  
  /** Sets whether the application intends to draw on the widget in
   * an Gtk::Widget::signal_draw() handler.
   * 
   * This is a hint to the widget and does not affect the behavior of
   * the GTK+ core; many widgets ignore this flag entirely. For widgets
   * that do pay attention to the flag, such as Gtk::EventBox and Gtk::Window,
   * the effect is to suppress default themed drawing of the widget's
   * background. (Children of the widget will still be drawn.) The application
   * is then entirely responsible for drawing the widget background.
   * 
   * Note that the background is still drawn when the widget is mapped.
   * 
   * @param app_paintable <tt>true</tt> if the application will paint on the widget.
   */
  void set_app_paintable(bool app_paintable =  true);
  
  /** Determines whether the application intends to draw on the widget in
   * an Gtk::Widget::signal_draw() handler.
   * 
   * See set_app_paintable()
   * 
   * @newin{2,18}
   * 
   * @return <tt>true</tt> if the widget is app paintable.
   */
  bool get_app_paintable() const;
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Widgets are double buffered by default; you can use this function
   * to turn off the buffering. “Double buffered” simply means that
   * gdk_window_begin_draw_frame() and gdk_window_end_draw_frame() are called
   * automatically around expose events sent to the
   * widget. gdk_window_begin_draw_frame() diverts all drawing to a widget's
   * window to an offscreen buffer, and gdk_window_end_draw_frame() draws the
   * buffer to the screen. The result is that users see the window
   * update in one smooth step, and don’t see individual graphics
   * primitives being rendered.
   * 
   * In very simple terms, double buffered widgets don’t flicker,
   * so you would only use this function to turn off double buffering
   * if you had special needs and really knew what you were doing.
   * 
   * @note if you turn off double-buffering, you have to handle
   * expose events, since even the clearing to the background color or
   * pixmap will not happen automatically (as it is done in
   * gdk_window_begin_draw_frame()).
   * 
   * In 3.10 GTK and GDK have been restructured for translucent drawing. Since
   * then expose events for double-buffered widgets are culled into a single
   * event to the toplevel GDK window. If you now unset double buffering, you
   * will cause a separate rendering pass for every widget. This will likely
   * cause rendering problems - in particular related to stacking - and usually
   * increases rendering times significantly.
   * 
   * Deprecated: 3.14: This function does not work under non-X11 backends or with
   * non-native windows.
   * It should not be used in newly written code.
   * 
   * @deprecated This does not work under non-X11 backends, and it should not be used in newly written code.
   * 
   * @param double_buffered <tt>true</tt> to double-buffer a widget.
   */
  void set_double_buffered(bool double_buffered =  true);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Determines whether the widget is double buffered.
   * 
   * See set_double_buffered()
   * 
   * @newin{2,18}
   * 
   * @deprecated This should not be used in newly written code.
   * 
   * @return <tt>true</tt> if the widget is double buffered.
   */
  bool get_double_buffered() const;
#endif // GTKMM_DISABLE_DEPRECATED


  /** Sets whether the entire widget is queued for drawing when its size
   * allocation changes. By default, this setting is <tt>true</tt> and
   * the entire widget is redrawn on every size change. If your widget
   * leaves the upper left unchanged when made bigger, turning this
   * setting off will improve performance.
   * 
   * Note that for widgets where get_has_window() is <tt>false</tt>
   * setting this flag to <tt>false</tt> turns off all allocation on resizing:
   * the widget will not even redraw if its position changes; this is to
   * allow containers that don’t draw anything to avoid excess
   * invalidations. If you set this flag on a widget with no window that
   * does draw on @a widget->window, you are
   * responsible for invalidating both the old and new allocation of the
   * widget when the widget is moved and responsible for invalidating
   * regions newly when the widget increases size.
   * 
   * @param redraw_on_allocate If <tt>true</tt>, the entire widget will be redrawn
   * when it is allocated to a new size. Otherwise, only the
   * new portion of the widget will be redrawn.
   */
  void set_redraw_on_allocate(bool redraw_on_allocate =  true);

  
  /** Sets whether @a widget should be mapped along with its when its parent
   * is mapped and @a widget has been shown with show().
   * 
   * The child visibility can be set for widget before it is added to
   * a container with set_parent(), to avoid mapping
   * children unnecessary before immediately unmapping them. However
   * it will be reset to its default state of <tt>true</tt> when the widget
   * is removed from a container.
   * 
   * Note that changing the child visibility of a widget does not
   * queue a resize on the widget. Most of the time, the size of
   * a widget is computed from all visible children, whether or
   * not they are mapped. If this is not the case, the container
   * can queue a resize itself.
   * 
   * This function is only useful for container implementations and
   * never should be called by an application.
   * 
   * @param visible If <tt>true</tt>, @a widget should be mapped along with its parent.
   */
  void set_child_visible(bool visible =  true);
  
  /** Gets the value set with set_child_visible().
   * If you feel a need to use this function, your code probably
   * needs reorganization.
   * 
   * This function is only useful for container implementations and
   * never should be called by an application.
   * 
   * @return <tt>true</tt> if the widget is mapped with the parent.
   */
  bool get_child_visible() const;

  
  /** Returns the widget’s window if it is realized, <tt>nullptr</tt> otherwise
   * 
   * @newin{2,14}
   * 
   * @return  @a widget’s window.
   */
  Glib::RefPtr<Gdk::Window> get_window();
  
  /** Returns the widget’s window if it is realized, <tt>nullptr</tt> otherwise
   * 
   * @newin{2,14}
   * 
   * @return  @a widget’s window.
   */
  Glib::RefPtr<const Gdk::Window> get_window() const;

  
  /** Registers a Gdk::Window with the widget and sets it up so that
   * the widget receives events for it. Call unregister_window()
   * when destroying the window.
   * 
   * Before 3.8 you needed to call gdk_window_set_user_data() directly to set
   * this up. This is now deprecated and you should use register_window()
   * instead. Old code will keep working as is, although some new features like
   * transparency might not work perfectly.
   * 
   * @newin{3,8}
   * 
   * @param window A Gdk::Window.
   */
  void register_window(const Glib::RefPtr<Gdk::Window>& window);
  
  /** Unregisters a Gdk::Window from the widget that was previously set up with
   * register_window(). You need to call this when the window is
   * no longer used by the widget, such as when you destroy it.
   * 
   * @newin{3,8}
   * 
   * @param window A Gdk::Window.
   */
  void unregister_window(const Glib::RefPtr<Gdk::Window>& window);

  
  /** Returns the width that has currently been allocated to @a widget.
   * This function is intended to be used when implementing handlers
   * for the Gtk::Widget::signal_draw() function.
   * 
   * @return The width of the @a widget.
   */
  int get_allocated_width() const;
  
  /** Returns the height that has currently been allocated to @a widget.
   * This function is intended to be used when implementing handlers
   * for the Gtk::Widget::signal_draw() function.
   * 
   * @return The height of the @a widget.
   */
  int get_allocated_height() const;
  
  /** Returns the baseline that has currently been allocated to @a widget.
   * This function is intended to be used when implementing handlers
   * for the Gtk::Widget::signal_draw() function, and when allocating child
   * widgets in Gtk::Widget::size_allocate.
   * 
   * @newin{3,10}
   * 
   * @return The baseline of the @a widget, or -1 if none.
   */
  int get_allocated_baseline() const;
  
  /** Retrieves the widget’s allocated size.
   * 
   * This function returns the last values passed to
   * size_allocate_with_baseline(). The value differs from
   * the size returned in get_allocation() in that functions
   * like set_halign() can adjust the allocation, but not
   * the value returned by this function.
   * 
   * If a widget is not visible, its allocated size is 0.
   * 
   * @newin{3,20}
   * 
   * @param allocation A pointer to a Gtk::Allocation to copy to.
   * @param baseline A pointer to an integer to copy to.
   */
  void get_allocated_size(Allocation& allocation, int& baseline) const;

  /** Retrieves the widget's location.
   * Note, when implementing a Container: a widget's allocation will be its "adjusted" allocation,
   * that is, the widget's parent container typically calls size_allocate() with an allocation,
   * and that allocation is then adjusted (to handle margin and alignment for example) before
   * assignment to the widget. get_allocation() returns the adjusted allocation that was actually
   * assigned to the widget. The adjusted allocation is guaranteed to be completely contained
   * within the size_allocate() allocation, however. So a Container is guaranteed that its
   * children stay inside the assigned bounds, but not that they have exactly the bounds the
   * container assigned. There is no way to get the original allocation assigned by
   * size_allocate(), since it isn't stored. If a container implementation needs that information
   * it will have to track it itself.
   *
   * @return The widget's allocated area.
   */
  Allocation get_allocation() const;
  

  /** Sets the widget’s allocation.  This should not be used
   * directly, but from within a widget’s size_allocate method.
   * 
   * The allocation set should be the “adjusted” or actual
   * allocation. If you’re implementing a Gtk::Container, you want to use
   * size_allocate() instead of set_allocation().
   * The GtkWidgetClass::adjust_size_allocation virtual method adjusts the
   * allocation inside size_allocate() to create an adjusted
   * allocation.
   * 
   * @newin{2,18}
   * 
   * @param allocation A pointer to a Gtk::Allocation to copy from.
   */
  void set_allocation(const Allocation& allocation);

  
  /** Sets the widget’s clip.  This must not be used directly,
   * but from within a widget’s size_allocate method.
   * It must be called after set_allocation() (or after chaining up
   * to the parent class), because that function resets the clip.
   * 
   * The clip set should be the area that @a widget draws on. If @a widget is a
   * Gtk::Container, the area must contain all children's clips.
   * 
   * If this function is not called by @a widget during a signal_size_allocate() handler,
   * the clip will be set to @a widget's allocation.
   * 
   * @newin{3,14}
   * 
   * @param clip A pointer to a Gtk::Allocation to copy from.
   */
  void set_clip(const Allocation& clip);

  /** Retrieves the widget’s clip area.
   *
   * The clip area is the area in which all of the widget's drawing will
   * happen. Other toolkits call it the bounding box.
   *
   * Historically, in GTK+ the clip area has been equal to the allocation
   * retrieved via get_allocation().
   *
   * @newin{3,14}
   */
  Allocation get_clip() const;
  

  /** Returns the parent container of @a widget.
   * 
   * @return The parent container of @a widget, or <tt>nullptr</tt>.
   */
  Container* get_parent();
  
  /** Returns the parent container of @a widget.
   * 
   * @return The parent container of @a widget, or <tt>nullptr</tt>.
   */
  const Container* get_parent() const;

  
  /** Gets @a widget’s parent window.
   * 
   * @return The parent window of @a widget.
   */
  Glib::RefPtr<Gdk::Window> get_parent_window();
  
  /** Gets @a widget’s parent window.
   * 
   * @return The parent window of @a widget.
   */
  Glib::RefPtr<const Gdk::Window> get_parent_window() const;
  
  /** Sets a non default parent window for @a widget.
   * 
   * For Gtk::Window classes, setting a @a parent_window effects whether
   * the window is a toplevel window or can be embedded into other
   * widgets.
   * 
   * For Gtk::Window classes, this needs to be called before the
   * window is realized.
   * 
   * @param parent_window The new parent window.
   */
  void set_parent_window(const Glib::RefPtr<const Gdk::Window>& parent_window);

  
  /** This function is used by custom widget implementations; if you're
   * writing an app, you’d use grab_focus() to move the focus
   * to a particular widget, and Gtk::Container::set_focus_chain() to
   * change the focus tab order. So you may want to investigate those
   * functions instead.
   * 
   * child_focus() is called by containers as the user moves
   * around the window using keyboard shortcuts. @a direction indicates
   * what kind of motion is taking place (up, down, left, right, tab
   * forward, tab backward). child_focus() emits the
   * Gtk::Widget::signal_focus() signal; widgets override the default handler
   * for this signal in order to implement appropriate focus behavior.
   * 
   * The default signal_focus() handler for a widget should return <tt>true</tt> if
   * moving in @a direction left the focus on a focusable location inside
   * that widget, and <tt>false</tt> if moving in @a direction moved the focus
   * outside the widget. If returning <tt>true</tt>, widgets normally
   * call grab_focus() to place the focus accordingly;
   * if returning <tt>false</tt>, they don’t modify the current focus location.
   * 
   * @param direction Direction of focus movement.
   * @return <tt>true</tt> if focus ended up inside @a widget.
   */
  bool child_focus(DirectionType direction);

  
  /** This function should be called whenever keyboard navigation within
   * a single widget hits a boundary. The function emits the
   * Gtk::Widget::signal_keynav_failed() signal on the widget and its return
   * value should be interpreted in a way similar to the return value of
   * child_focus():
   * 
   * When <tt>true</tt> is returned, stay in the widget, the failed keyboard
   * navigation is OK and/or there is nowhere we can/should move the
   * focus to.
   * 
   * When <tt>false</tt> is returned, the caller should continue with keyboard
   * navigation outside the widget, e.g. by calling
   * child_focus() on the widget’s toplevel.
   * 
   * The default signal_keynav_failed() handler returns <tt>true</tt> for
   * Gtk::DIR_TAB_FORWARD and Gtk::DIR_TAB_BACKWARD. For the other
   * values of Gtk::DirectionType it returns <tt>false</tt>.
   * 
   * Whenever the default handler returns <tt>true</tt>, it also calls
   * error_bell() to notify the user of the failed keyboard
   * navigation.
   * 
   * A use case for providing an own implementation of signal_keynav_failed()
   * (either by connecting to it or by overriding it) would be a row of
   * Gtk::Entry widgets where the user should be able to navigate the
   * entire row with the cursor keys, as e.g. known from user interfaces
   * that require entering license keys.
   * 
   * @newin{2,12}
   * 
   * @param direction Direction of focus movement.
   * @return <tt>true</tt> if stopping keyboard navigation is fine, <tt>false</tt>
   * if the emitting widget should try to handle the keyboard
   * navigation attempt in its parent container(s).
   */
  bool keynav_failed(DirectionType direction);
  
  /** Notifies the user about an input-related error on this widget. 
   * If the Gtk::Settings gtk-error-bell property is true, it calls
   * Gdk::Window::beep(), otherwise it does nothing.
   * 
   * Note that the effect of Gdk::Window::beep() can be configured in many
   * ways, depending on the windowing backend and the desktop environment
   * or window manager that is used.
   * 
   * @newin{2,12}
   */
  void error_bell();

  
  /** Sets the minimum size of a widget; that is, the widget’s size
   * request will be at least @a width by @a height. You can use this 
   * function to force a widget to be larger than it normally would be.
   * 
   * In most cases, Gtk::Window::set_default_size() is a better choice for
   * toplevel windows than this function; setting the default size will
   * still allow users to shrink the window. Setting the size request
   * will force them to leave the window at least as large as the size
   * request. When dealing with window sizes,
   * Gtk::Window::set_geometry_hints() can be a useful function as well.
   * 
   * Note the inherent danger of setting any fixed size - themes,
   * translations into other languages, different fonts, and user action
   * can all change the appropriate size for a given widget. So, it's
   * basically impossible to hardcode a size that will always be
   * correct.
   * 
   * The size request of a widget is the smallest size a widget can
   * accept while still functioning well and drawing itself correctly.
   * However in some strange cases a widget may be allocated less than
   * its requested size, and in many cases a widget may be allocated more
   * space than it requested.
   * 
   * If the size request in a given direction is -1 (unset), then
   * the “natural” size request of the widget will be used instead.
   * 
   * The size request set here does not include any margin from the
   * Gtk::Widget properties margin-left, margin-right, margin-top, and
   * margin-bottom, but it does include pretty much all other padding
   * or border properties set by any subclass of Gtk::Widget.
   * 
   * @param width Width @a widget should request, or -1 to unset.
   * @param height Height @a widget should request, or -1 to unset.
   */
  void set_size_request(int width =  -1, int height =  -1);
  
  /** Gets the size request that was explicitly set for the widget using
   * set_size_request(). A value of -1 stored in @a width or
   *  @a height indicates that that dimension has not been set explicitly
   * and the natural requisition of the widget will be used instead. See
   * set_size_request(). To get the size a widget will
   * actually request, call get_preferred_size() instead of
   * this function.
   * 
   * @param width Return location for width, or <tt>nullptr</tt>.
   * @param height Return location for height, or <tt>nullptr</tt>.
   */
  void get_size_request(int& width, int& height) const;

  
  /** Sets the event mask (see Gdk::EventMask) for a widget. The event
   * mask determines which events a widget will receive. Keep in mind
   * that different widgets have different default event masks, and by
   * changing the event mask you may disrupt a widget’s functionality,
   * so be careful. This function must be called while a widget is
   * unrealized. Consider add_events() for widgets that are
   * already realized, or if you want to preserve the existing event
   * mask. This function can’t be used with widgets that have no window.
   * (See get_has_window()).  To get events on those widgets,
   * place them inside a Gtk::EventBox and receive events on the event
   * box.
   * 
   * @param events Event mask.
   */
  void set_events(Gdk::EventMask events);
  
  /** Adds the events in the bitfield @a events to the event mask for
   *  @a widget. See set_events() and the
   * [input handling overview][event-masks] for details.
   * 
   * @param events An event mask, see Gdk::EventMask.
   */
  void add_events(Gdk::EventMask events);

  
  /** Sets the device event mask (see Gdk::EventMask) for a widget. The event
   * mask determines which events a widget will receive from @a device. Keep
   * in mind that different widgets have different default event masks, and by
   * changing the event mask you may disrupt a widget’s functionality,
   * so be careful. This function must be called while a widget is
   * unrealized. Consider add_device_events() for widgets that are
   * already realized, or if you want to preserve the existing event
   * mask. This function can’t be used with windowless widgets (which return
   * <tt>false</tt> from get_has_window());
   * to get events on those widgets, place them inside a Gtk::EventBox
   * and receive events on the event box.
   * 
   * @newin{3,0}
   * 
   * @param device A Gdk::Device.
   * @param events Event mask.
   */
  void set_device_events(const Glib::RefPtr<const Gdk::Device>& device, Gdk::EventMask events);
  
  /** Adds the device events in the bitfield @a events to the event mask for
   *  @a widget. See set_device_events() for details.
   * 
   * @newin{3,0}
   * 
   * @param device A Gdk::Device.
   * @param events An event mask, see Gdk::EventMask.
   */
  void add_device_events(const Glib::RefPtr<const Gdk::Device>& device, Gdk::EventMask events);

  
  /** Request the @a widget to be rendered partially transparent,
   * with opacity 0 being fully transparent and 1 fully opaque. (Opacity values
   * are clamped to the [0,1] range.).
   * This works on both toplevel widget, and child widgets, although there
   * are some limitations:
   * 
   * For toplevel widgets this depends on the capabilities of the windowing
   * system. On X11 this has any effect only on X screens with a compositing manager
   * running. See is_composited(). On Windows it should work
   * always, although setting a window’s opacity after the window has been
   * shown causes it to flicker once on Windows.
   * 
   * For child widgets it doesn’t work if any affected widget has a native window, or
   * disables double buffering.
   * 
   * @newin{3,8}
   * 
   * @param opacity Desired opacity, between 0 and 1.
   */
  void set_opacity(double opacity);
  
  /** Fetches the requested opacity for this widget.
   * See set_opacity().
   * 
   * @newin{3,8}
   * 
   * @return The requested opacity for this widget.
   */
  double get_opacity() const;

  
  /** Enables or disables a Gdk::Device to interact with @a widget
   * and all its children.
   * 
   * It does so by descending through the Gdk::Window hierarchy
   * and enabling the same mask that is has for core events
   * (i.e. the one that gdk_window_get_events() returns).
   * 
   * @newin{3,0}
   * 
   * @param device A Gdk::Device.
   * @param enabled Whether to enable the device.
   */
  void set_device_enabled(const Glib::RefPtr<Gdk::Device>& device, bool enabled =  true);
  
  /** Returns whether @a device can interact with @a widget and its
   * children. See set_device_enabled().
   * 
   * @newin{3,0}
   * 
   * @param device A Gdk::Device.
   * @return <tt>true</tt> is @a device is enabled for @a widget.
   */
  bool get_device_enabled(const Glib::RefPtr<const Gdk::Device>& device) const;

  
  /** This function returns the topmost widget in the container hierarchy
   *  @a widget is a part of. If @a widget has no parent widgets, it will be
   * returned as the topmost widget. No reference will be added to the
   * returned widget; it should not be unreferenced.
   * 
   * Note the difference in behavior vs. get_ancestor();
   * `gtk_widget_get_ancestor (widget, GTK_TYPE_WINDOW)`
   * would return
   * <tt>nullptr</tt> if @a widget wasn’t inside a toplevel window, and if the
   * window was inside a Gtk::Window-derived widget which was in turn
   * inside the toplevel Gtk::Window. While the second case may
   * seem unlikely, it actually happens when a Gtk::Plug is embedded
   * inside a Gtk::Socket within the same application.
   * 
   * To reliably find the toplevel Gtk::Window, use
   * get_toplevel() and call is_toplevel()
   * on the result.
   * 
   * [C example ellipted]
   * 
   * @return The topmost ancestor of @a widget, or @a widget itself
   * if there’s no ancestor.
   */
  Container* get_toplevel();
  
  /** This function returns the topmost widget in the container hierarchy
   *  @a widget is a part of. If @a widget has no parent widgets, it will be
   * returned as the topmost widget. No reference will be added to the
   * returned widget; it should not be unreferenced.
   * 
   * Note the difference in behavior vs. get_ancestor();
   * `gtk_widget_get_ancestor (widget, GTK_TYPE_WINDOW)`
   * would return
   * <tt>nullptr</tt> if @a widget wasn’t inside a toplevel window, and if the
   * window was inside a Gtk::Window-derived widget which was in turn
   * inside the toplevel Gtk::Window. While the second case may
   * seem unlikely, it actually happens when a Gtk::Plug is embedded
   * inside a Gtk::Socket within the same application.
   * 
   * To reliably find the toplevel Gtk::Window, use
   * get_toplevel() and call is_toplevel()
   * on the result.
   * 
   * [C example ellipted]
   * 
   * @return The topmost ancestor of @a widget, or @a widget itself
   * if there’s no ancestor.
   */
  const Container* get_toplevel() const;

  
  /** Gets the first ancestor of @a widget with type @a widget_type. For example,
   * `gtk_widget_get_ancestor (widget, GTK_TYPE_BOX)` gets
   * the first Gtk::Box that’s an ancestor of @a widget. No reference will be
   * added to the returned widget; it should not be unreferenced. See note
   * about checking for a toplevel Gtk::Window in the docs for
   * get_toplevel().
   * 
   * Note that unlike is_ancestor(), get_ancestor()
   * considers @a widget to be an ancestor of itself.
   * 
   * @param widget_type Ancestor type.
   * @return The ancestor widget, or <tt>nullptr</tt> if not found.
   */
  Widget* get_ancestor(GType widget_type);
  
  /** Gets the first ancestor of @a widget with type @a widget_type. For example,
   * `gtk_widget_get_ancestor (widget, GTK_TYPE_BOX)` gets
   * the first Gtk::Box that’s an ancestor of @a widget. No reference will be
   * added to the returned widget; it should not be unreferenced. See note
   * about checking for a toplevel Gtk::Window in the docs for
   * get_toplevel().
   * 
   * Note that unlike is_ancestor(), get_ancestor()
   * considers @a widget to be an ancestor of itself.
   * 
   * @param widget_type Ancestor type.
   * @return The ancestor widget, or <tt>nullptr</tt> if not found.
   */
  const Widget* get_ancestor(GType widget_type) const;


  /** Gets the visual that will be used to render @a widget.
   * 
   * @return The visual for @a widget.
   */
  Glib::RefPtr<Gdk::Visual> get_visual();

  
  /** Get the Gdk::Screen from the toplevel window associated with
   * this widget. This function can only be called after the widget
   * has been added to a widget hierarchy with a Gtk::Window
   * at the top.
   * 
   * In general, you should only create screen specific
   * resources when a widget has been realized, and you should
   * free those resources when the widget is unrealized.
   * 
   * @newin{2,2}
   * 
   * @return The Gdk::Screen for the toplevel for this widget.
   */
  Glib::RefPtr<Gdk::Screen> get_screen();
  
  /** Get the Gdk::Screen from the toplevel window associated with
   * this widget. This function can only be called after the widget
   * has been added to a widget hierarchy with a Gtk::Window
   * at the top.
   * 
   * In general, you should only create screen specific
   * resources when a widget has been realized, and you should
   * free those resources when the widget is unrealized.
   * 
   * @newin{2,2}
   * 
   * @return The Gdk::Screen for the toplevel for this widget.
   */
  Glib::RefPtr<const Gdk::Screen> get_screen() const;

  
  /** Checks whether there is a Gdk::Screen is associated with
   * this widget. All toplevel widgets have an associated
   * screen, and all widgets added into a hierarchy with a toplevel
   * window at the top.
   * 
   * @newin{2,2}
   * 
   * @return <tt>true</tt> if there is a Gdk::Screen associated
   * with the widget.
   */
  bool has_screen() const;

  
  /** Retrieves the internal scale factor that maps from window coordinates
   * to the actual device pixels. On traditional systems this is 1, on
   * high density outputs, it can be a higher value (typically 2).
   * 
   * See gdk_window_get_scale_factor().
   * 
   * @newin{3,10}
   * 
   * @return The scale factor for @a widget.
   */
  int get_scale_factor() const;

  
  /** Get the Gdk::Display for the toplevel window associated with
   * this widget. This function can only be called after the widget
   * has been added to a widget hierarchy with a Gtk::Window at the top.
   * 
   * In general, you should only create display specific
   * resources when a widget has been realized, and you should
   * free those resources when the widget is unrealized.
   * 
   * @newin{2,2}
   * 
   * @return The Gdk::Display for the toplevel for this widget.
   */
  Glib::RefPtr<Gdk::Display> get_display();
  
  /** Get the Gdk::Display for the toplevel window associated with
   * this widget. This function can only be called after the widget
   * has been added to a widget hierarchy with a Gtk::Window at the top.
   * 
   * In general, you should only create display specific
   * resources when a widget has been realized, and you should
   * free those resources when the widget is unrealized.
   * 
   * @newin{2,2}
   * 
   * @return The Gdk::Display for the toplevel for this widget.
   */
  Glib::RefPtr<const Gdk::Display> get_display() const;

  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Get the root window where this widget is located. This function can
   * only be called after the widget has been added to a widget
   * hierarchy with Gtk::Window at the top.
   * 
   * The root window is useful for such purposes as creating a popup
   * Gdk::Window associated with the window. In general, you should only
   * create display specific resources when a widget has been realized,
   * and you should free those resources when the widget is unrealized.
   * 
   * @newin{2,2}
   * 
   * Deprecated: 3.12: Use gdk_screen_get_root_window() instead
   * 
   * @deprecated Use Gdk::Screen::get_root_window() instead.
   * 
   * @return The Gdk::Window root window for the toplevel for this widget.
   */
  Glib::RefPtr<Gdk::Window> get_root_window();
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Get the root window where this widget is located. This function can
   * only be called after the widget has been added to a widget
   * hierarchy with Gtk::Window at the top.
   * 
   * The root window is useful for such purposes as creating a popup
   * Gdk::Window associated with the window. In general, you should only
   * create display specific resources when a widget has been realized,
   * and you should free those resources when the widget is unrealized.
   * 
   * @newin{2,2}
   * 
   * Deprecated: 3.12: Use gdk_screen_get_root_window() instead
   * 
   * @deprecated Use Gdk::Screen::get_root_window() instead.
   * 
   * @return The Gdk::Window root window for the toplevel for this widget.
   */
  Glib::RefPtr<const Gdk::Window> get_root_window() const;
#endif // GTKMM_DISABLE_DEPRECATED


  /** Gets the settings object holding the settings used for this widget.
   * 
   * Note that this function can only be called when the Gtk::Widget
   * is attached to a toplevel, since the settings object is specific
   * to a particular Gdk::Screen.
   * 
   * @return The relevant Gtk::Settings object.
   */
  Glib::RefPtr<Settings> get_settings();

  
  /** Returns the clipboard object for the given selection to
   * be used with @a widget. @a widget must have a Gdk::Display
   * associated with it, so must be attached to a toplevel
   * window.
   * 
   * @newin{2,2}
   * 
   * @param selection A Gdk::Atom which identifies the clipboard
   * to use. Gdk::SELECTION_CLIPBOARD gives the
   * default clipboard. Another common value
   * is Gdk::SELECTION_PRIMARY, which gives
   * the primary X selection.
   * @return The appropriate clipboard object. If no
   * clipboard already exists, a new one will
   * be created. Once a clipboard object has
   * been created, it is persistent for all time.
   */
  Glib::RefPtr<Clipboard> get_clipboard(const Glib::ustring& selection);
  
  /** Returns the clipboard object for the given selection to
   * be used with @a widget. @a widget must have a Gdk::Display
   * associated with it, so must be attached to a toplevel
   * window.
   * 
   * @newin{2,2}
   * 
   * @param selection A Gdk::Atom which identifies the clipboard
   * to use. Gdk::SELECTION_CLIPBOARD gives the
   * default clipboard. Another common value
   * is Gdk::SELECTION_PRIMARY, which gives
   * the primary X selection.
   * @return The appropriate clipboard object. If no
   * clipboard already exists, a new one will
   * be created. Once a clipboard object has
   * been created, it is persistent for all time.
   */
  Glib::RefPtr<const Clipboard> get_clipboard(const Glib::ustring& selection) const;

  
  /** Gets whether the widget would like any available extra horizontal
   * space. When a user resizes a Gtk::Window, widgets with expand=<tt>true</tt>
   * generally receive the extra space. For example, a list or
   * scrollable area or document in your window would often be set to
   * expand.
   * 
   * Containers should use compute_expand() rather than
   * this function, to see whether a widget, or any of its children,
   * has the expand flag set. If any child of a widget wants to
   * expand, the parent may ask to expand also.
   * 
   * This function only looks at the widget’s own hexpand flag, rather
   * than computing whether the entire widget tree rooted at this widget
   * wants to expand.
   * 
   * @return Whether hexpand flag is set.
   */
  bool get_hexpand() const;
  
  /** Sets whether the widget would like any available extra horizontal
   * space. When a user resizes a Gtk::Window, widgets with expand=<tt>true</tt>
   * generally receive the extra space. For example, a list or
   * scrollable area or document in your window would often be set to
   * expand.
   * 
   * Call this function to set the expand flag if you would like your
   * widget to become larger horizontally when the window has extra
   * room.
   * 
   * By default, widgets automatically expand if any of their children
   * want to expand. (To see if a widget will automatically expand given
   * its current children and state, call compute_expand(). A
   * container can decide how the expandability of children affects the
   * expansion of the container by overriding the compute_expand virtual
   * method on Gtk::Widget.).
   * 
   * Setting hexpand explicitly with this function will override the
   * automatic expand behavior.
   * 
   * This function forces the widget to expand or not to expand,
   * regardless of children.  The override occurs because
   * set_hexpand() sets the hexpand-set property (see
   * set_hexpand_set()) which causes the widget’s hexpand
   * value to be used, rather than looking at children and widget state.
   * 
   * @param expand Whether to expand.
   */
  void set_hexpand(bool expand =  true);
  
  /** Gets whether set_hexpand() has been used to
   * explicitly set the expand flag on this widget.
   * 
   * If hexpand is set, then it overrides any computed
   * expand value based on child widgets. If hexpand is not
   * set, then the expand value depends on whether any
   * children of the widget would like to expand.
   * 
   * There are few reasons to use this function, but it’s here
   * for completeness and consistency.
   * 
   * @return Whether hexpand has been explicitly set.
   */
  bool get_hexpand_set() const;
  
  /** Sets whether the hexpand flag (see get_hexpand()) will
   * be used.
   * 
   * The hexpand-set property will be set automatically when you call
   * set_hexpand() to set hexpand, so the most likely
   * reason to use this function would be to unset an explicit expand
   * flag.
   * 
   * If hexpand is set, then it overrides any computed
   * expand value based on child widgets. If hexpand is not
   * set, then the expand value depends on whether any
   * children of the widget would like to expand.
   * 
   * There are few reasons to use this function, but it’s here
   * for completeness and consistency.
   * 
   * @param set Value for hexpand-set property.
   */
  void set_hexpand_set(bool set =  true);
  
  /** Gets whether the widget would like any available extra vertical
   * space.
   * 
   * See get_hexpand() for more detail.
   * 
   * @return Whether vexpand flag is set.
   */
  bool get_vexpand() const;
  
  /** Sets whether the widget would like any available extra vertical
   * space.
   * 
   * See set_hexpand() for more detail.
   * 
   * @param expand Whether to expand.
   */
  void set_vexpand(bool expand =  true);
  
  /** Gets whether set_vexpand() has been used to
   * explicitly set the expand flag on this widget.
   * 
   * See get_hexpand_set() for more detail.
   * 
   * @return Whether vexpand has been explicitly set.
   */
  bool get_vexpand_set() const;
  
  /** Sets whether the vexpand flag (see get_vexpand()) will
   * be used.
   * 
   * See set_hexpand_set() for more detail.
   * 
   * @param set Value for vexpand-set property.
   */
  void set_vexpand_set(bool set =  true);
  
  /** Mark @a widget as needing to recompute its expand flags. Call
   * this function when setting legacy expand child properties
   * on the child of a container.
   * 
   * See compute_expand().
   */
  void queue_compute_expand();
  
  /** Computes whether a container should give this widget extra space
   * when possible. Containers should check this, rather than
   * looking at get_hexpand() or get_vexpand().
   * 
   * This function already checks whether the widget is visible, so
   * visibility does not need to be checked separately. Non-visible
   * widgets are not expanded.
   * 
   * The computed expand value uses either the expand setting explicitly
   * set on the widget itself, or, if none has been explicitly set,
   * the widget may expand if some of its children do.
   * 
   * @param orientation Expand direction.
   * @return Whether widget tree rooted here should be expanded.
   */
  bool compute_expand(Orientation orientation);

  
  /** Returns <tt>true</tt> if @a widget is multiple pointer aware. See
   * set_support_multidevice() for more information.
   * 
   * @return <tt>true</tt> if @a widget is multidevice aware.
   */
  bool get_support_multidevice() const;
  
  /** Enables or disables multiple pointer awareness. If this setting is <tt>true</tt>,
   *  @a widget will start receiving multiple, per device enter/leave events. Note
   * that if custom Gdk::Windows are created in Gtk::Widget::signal_realize(),
   * gdk_window_set_support_multidevice() will have to be called manually on them.
   * 
   * @newin{3,0}
   * 
   * @param support_multidevice <tt>true</tt> to support input from multiple devices.
   */
  void set_support_multidevice(bool support_multidevice =  true);

  
#ifdef  GTKMM_ATKMM_ENABLED

  /** Returns the accessible object that describes the widget to an
   * assistive technology.
   * 
   * If accessibility support is not available, this Atk::Object
   * instance may be a no-op. Likewise, if no class-specific Atk::Object
   * implementation is available for the widget instance in question,
   * it will inherit an Atk::Object implementation from the first ancestor
   * class for which such an implementation is defined.
   * 
   * The documentation of the
   * [ATK](http://developer.gnome.org/atk/stable/)
   * library contains more information about accessible objects and their uses.
   * 
   * @return The Atk::Object associated with @a widget.
   */
  Glib::RefPtr<Atk::Object> get_accessible();
#endif //  GTKMM_ATKMM_ENABLED

  
#ifdef  GTKMM_ATKMM_ENABLED

  /** Returns the accessible object that describes the widget to an
   * assistive technology.
   * 
   * If accessibility support is not available, this Atk::Object
   * instance may be a no-op. Likewise, if no class-specific Atk::Object
   * implementation is available for the widget instance in question,
   * it will inherit an Atk::Object implementation from the first ancestor
   * class for which such an implementation is defined.
   * 
   * The documentation of the
   * [ATK](http://developer.gnome.org/atk/stable/)
   * library contains more information about accessible objects and their uses.
   * 
   * @return The Atk::Object associated with @a widget.
   */
  Glib::RefPtr<const Atk::Object> get_accessible() const;
#endif //  GTKMM_ATKMM_ENABLED


  /** Gets the value of the Gtk::Widget::property_halign() property.
   * 
   * For backwards compatibility reasons this method will never return
   * Gtk::ALIGN_BASELINE, but instead it will convert it to
   * Gtk::ALIGN_FILL. Baselines are not supported for horizontal
   * alignment.
   * 
   * @return The horizontal alignment of @a widget.
   */
  Align get_halign() const;
  
  /** Sets the horizontal alignment of @a widget.
   * See the Gtk::Widget::property_halign() property.
   * 
   * @param align The horizontal alignment.
   */
  void set_halign(Align align);
  
  /** Gets the value of the Gtk::Widget::property_valign() property.
   * 
   * For backwards compatibility reasons this method will never return
   * Gtk::ALIGN_BASELINE, but instead it will convert it to
   * Gtk::ALIGN_FILL. If your widget want to support baseline aligned
   * children it must use get_valign_with_baseline(), or
   * `g_object_get (widget, "valign", &value, <tt>nullptr</tt>)`, which will
   * also report the true value.
   * 
   * @return The vertical alignment of @a widget, ignoring baseline alignment.
   */
  Align get_valign() const;
  
  /** Gets the value of the Gtk::Widget::property_valign() property, including
   * Gtk::ALIGN_BASELINE.
   * 
   * @newin{3,10}
   * 
   * @return The vertical alignment of @a widget.
   */
  Align get_valign_with_baseline() const;
  
  /** Sets the vertical alignment of @a widget.
   * See the Gtk::Widget::property_valign() property.
   * 
   * @param align The vertical alignment.
   */
  void set_valign(Align align);
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Gets the value of the Gtk::Widget::property_margin_left() property.
   * 
   * Deprecated: 3.12: Use get_margin_start() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use get_margin_start() instead.
   * 
   * @return The left margin of @a widget.
   */
  int get_margin_left() const;
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the left margin of @a widget.
   * See the Gtk::Widget::property_margin_left() property.
   * 
   * Deprecated: 3.12: Use set_margin_start() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use set_margin_start() instead.
   * 
   * @param margin The left margin.
   */
  void set_margin_left(int margin);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Gets the value of the Gtk::Widget::property_margin_right() property.
   * 
   * Deprecated: 3.12: Use get_margin_end() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use get_margin_end() instead.
   * 
   * @return The right margin of @a widget.
   */
  int get_margin_right() const;
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the right margin of @a widget.
   * See the Gtk::Widget::property_margin_right() property.
   * 
   * Deprecated: 3.12: Use set_margin_end() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use set_margin_end() instead.
   * 
   * @param margin The right margin.
   */
  void set_margin_right(int margin);
#endif // GTKMM_DISABLE_DEPRECATED


  /** Gets the value of the Gtk::Widget::property_margin_start() property.
   * 
   * @newin{3,12}
   * 
   * @return The start margin of @a widget.
   */
  int get_margin_start() const;
  
  /** Sets the start margin of @a widget.
   * See the Gtk::Widget::property_margin_start() property.
   * 
   * @newin{3,12}
   * 
   * @param margin The start margin.
   */
  void set_margin_start(int margin);
  
  /** Gets the value of the Gtk::Widget::property_margin_end() property.
   * 
   * @newin{3,12}
   * 
   * @return The end margin of @a widget.
   */
  int get_margin_end() const;
  
  /** Sets the end margin of @a widget.
   * See the Gtk::Widget::property_margin_end() property.
   * 
   * @newin{3,12}
   * 
   * @param margin The end margin.
   */
  void set_margin_end(int margin);
  
  /** Gets the value of the Gtk::Widget::property_margin_top() property.
   * 
   * @newin{3,0}
   * 
   * @return The top margin of @a widget.
   */
  int get_margin_top() const;
  
  /** Sets the top margin of @a widget.
   * See the Gtk::Widget::property_margin_top() property.
   * 
   * @newin{3,0}
   * 
   * @param margin The top margin.
   */
  void set_margin_top(int margin);
  
  /** Gets the value of the Gtk::Widget::property_margin_bottom() property.
   * 
   * @newin{3,0}
   * 
   * @return The bottom margin of @a widget.
   */
  int get_margin_bottom() const;
  
  /** Sets the bottom margin of @a widget.
   * See the Gtk::Widget::property_margin_bottom() property.
   * 
   * @newin{3,0}
   * 
   * @param margin The bottom margin.
   */
  void set_margin_bottom(int margin);

  
  /** Returns the event mask (see Gdk::EventMask) for the widget. These are the
   * events that the widget will receive.
   * 
   * @note Internally, the widget event mask will be the logical OR of the event
   * mask set through set_events() or add_events(), and the
   * event mask necessary to cater for every Gtk::EventController created for the
   * widget.
   * 
   * @return Event mask for @a widget.
   */
  Gdk::EventMask get_events() const;
  
  /** Returns the events mask for the widget corresponding to an specific device. These
   * are the events that the widget will receive when @a device operates on it.
   * 
   * @newin{3,0}
   * 
   * @param device A Gdk::Device.
   * @return Device event mask for @a widget.
   */
  Gdk::EventMask get_device_events(const Glib::RefPtr<const Gdk::Device>& device) const;
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Obtains the location of the mouse pointer in widget coordinates.
   * Widget coordinates are a bit odd; for historical reasons, they are
   * defined as @a widget->window coordinates for widgets that return <tt>true</tt> for
   * get_has_window(); and are relative to @a widget->allocation.x,
   *  @a widget->allocation.y otherwise.
   * 
   * Deprecated: 3.4: Use gdk_window_get_device_position() instead.
   * 
   * @deprecated Use Gdk::Window::get_device_position instead.
   * 
   * @param x Return location for the X coordinate, or <tt>nullptr</tt>.
   * @param y Return location for the Y coordinate, or <tt>nullptr</tt>.
   */
  void get_pointer(int & x, int & y) const;
#endif // GTKMM_DISABLE_DEPRECATED


  /** Determines whether @a widget is somewhere inside @a ancestor, possibly with
   * intermediate containers.
   * 
   * @param ancestor Another Gtk::Widget.
   * @return <tt>true</tt> if @a ancestor contains @a widget as a child,
   * grandchild, great grandchild, etc.
   */
  bool is_ancestor(Widget & ancestor) const;

  
  /** Translate coordinates relative to @a src_widget’s allocation to coordinates
   * relative to @a dest_widget’s allocations. In order to perform this
   * operation, both widgets must be realized, and must share a common
   * toplevel.
   * 
   * @param dest_widget A Gtk::Widget.
   * @param src_x X position relative to @a src_widget.
   * @param src_y Y position relative to @a src_widget.
   * @param dest_x Location to store X position relative to @a dest_widget.
   * @param dest_y Location to store Y position relative to @a dest_widget.
   * @return <tt>false</tt> if either widget was not realized, or there
   * was no common ancestor. In this case, nothing is stored in
   * * @a dest_x and * @a dest_y. Otherwise <tt>true</tt>.
   */
  bool translate_coordinates(Widget& dest_widget, int src_x, int src_y, int& dest_x, int& dest_y);

   //deprecated broadly in favour of StyleContext.;

  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the color to use for a widget.
   * 
   * All other style values are left untouched.
   * 
   * This function does not act recursively. Setting the color of a
   * container does not affect its children. Note that some widgets that
   * you may not think of as containers, for instance Gtk::Buttons,
   * are actually containers.
   * 
   * This API is mostly meant as a quick way for applications to
   * change a widget appearance. If you are developing a widgets
   * library and intend this change to be themeable, it is better
   * done by setting meaningful CSS classes in your
   * widget/container implementation through Gtk::StyleContext::add_class().
   * 
   * This way, your widget library can install a Gtk::CssProvider
   * with the Gtk::STYLE_PROVIDER_PRIORITY_FALLBACK priority in order
   * to provide a default styling for those widgets that need so, and
   * this theming may fully overridden by the user’s theme.
   * 
   * Note that for complex widgets this may bring in undesired
   * results (such as uniform background color everywhere), in
   * these cases it is better to fully style such widgets through a
   * Gtk::CssProvider with the Gtk::STYLE_PROVIDER_PRIORITY_APPLICATION
   * priority.
   * 
   * @newin{3,0}
   * 
   * Deprecated:3.16: Use a custom style provider and style classes instead
   * 
   * @deprecated Use a custom style provider and style classes instead.
   * 
   * @param state The state for which to set the color.
   * @param color The color to assign, or <tt>nullptr</tt> to undo the effect
   * of previous calls to override_color().
   */
  void override_color(const Gdk::RGBA& color, StateFlags state =  STATE_FLAG_NORMAL);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Undoes the effect of previous calls to override_color().
   *
   * @newin{3,0}
   * @deprecated Use a custom style provider and style classes instead.
   *
   * @param state The state for which to use the color of the user's theme.
   */
  void unset_color(StateFlags state = STATE_FLAG_NORMAL);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the background color to use for a widget.
   * 
   * All other style values are left untouched.
   * See override_color().
   * 
   * @newin{3,0}
   * 
   * Deprecated: 3.16: This function is not useful in the context of CSS-based
   * rendering. If you wish to change the way a widget renders its background
   * you should use a custom CSS style, through an application-specific
   * Gtk::StyleProvider and a CSS style class. You can also override the default
   * drawing of a widget through the Gtk::Widget::signal_draw() signal, and use Cairo to
   * draw a specific color, regardless of the CSS style.
   * 
   * @deprecated Use a custom style provider and style classes instead.
   * 
   * @param state The state for which to set the background color.
   * @param color The color to assign, or <tt>nullptr</tt> to undo the effect
   * of previous calls to override_background_color().
   */
  void override_background_color(const Gdk::RGBA& color, StateFlags state =  STATE_FLAG_NORMAL);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Undoes the effect of previous calls to override_background_color().
   *
   * @newin{3,0}
   * @deprecated Use a custom style provider and style classes instead.
   *
   * @param state The state for which to use the background color of the user's theme.
   */
  void unset_background_color(StateFlags state = STATE_FLAG_NORMAL);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the font to use for a widget. All other style values are
   * left untouched. See override_color().
   * 
   * @newin{3,0}
   * 
   * Deprecated: 3.16: This function is not useful in the context of CSS-based
   * rendering. If you wish to change the font a widget uses to render its text
   * you should use a custom CSS style, through an application-specific
   * Gtk::StyleProvider and a CSS style class.
   * 
   * @deprecated Use a custom style provider and style classes instead.
   * 
   * @param font_desc The font description to use, or <tt>nullptr</tt> to undo
   * the effect of previous calls to override_font().
   */
  void override_font(const Pango::FontDescription& font_desc);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Undoes the effect of previous calls to override_font().
   *
   * @newin{3,0}
   * @deprecated Use a custom style provider and style classes instead.
   */
  void unset_font();
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets a symbolic color for a widget.
   * 
   * All other style values are left untouched.
   * See override_color() for overriding the foreground
   * or background color.
   * 
   * @newin{3,0}
   * 
   * Deprecated: 3.16: This function is not useful in the context of CSS-based
   * rendering. If you wish to change the color used to render symbolic icons
   * you should use a custom CSS style, through an application-specific
   * Gtk::StyleProvider and a CSS style class.
   * 
   * @deprecated Use a custom style provider and style classes instead.
   * 
   * @param name The name of the symbolic color to modify.
   * @param color The color to assign (does not need
   * to be allocated), or <tt>nullptr</tt> to undo the effect of previous
   * calls to override_symbolic_color().
   */
  void override_symbolic_color(const Glib::ustring& name, const Gdk::RGBA& color);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Undoes the effect of previous calls to override_symbolic_color().
   *
   * @newin{3,0}
   * @deprecated Use a custom style provider and style classes instead.
   *
   * @param name The name of the symbolic color to fetch from the user's theme.
   */
  void unset_symbolic_color(const Glib::ustring& name);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the cursor color to use in a widget, overriding the
   * cursor-color and secondary-cursor-color
   * style properties. All other style values are left untouched.
   * See also modify_style().
   * 
   * Note that the underlying properties have the Gdk::Color type,
   * so the alpha value in @a primary and @a secondary will be ignored.
   * 
   * @newin{3,0}
   * 
   * Deprecated: 3.16: This function is not useful in the context of CSS-based
   * rendering. If you wish to change the color used to render the primary
   * and secondary cursors you should use a custom CSS style, through an
   * application-specific Gtk::StyleProvider and a CSS style class.
   * 
   * @deprecated Use a custom style provider and style classes instead.
   * 
   * @param cursor The color to use for primary cursor (does not need to be
   * allocated), or <tt>nullptr</tt> to undo the effect of previous calls to
   * of override_cursor().
   * @param secondary_cursor The color to use for secondary cursor (does not
   * need to be allocated), or <tt>nullptr</tt> to undo the effect of previous
   * calls to of override_cursor().
   */
  void override_cursor(const Gdk::RGBA& cursor, const Gdk::RGBA& secondary_cursor);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Undoes the effect of previous calls to override_cursor().
   *
   * @newin{3,0}
   * @deprecated Use a custom style provider and style classes instead.
   */
  void unset_cursor();
#endif // GTKMM_DISABLE_DEPRECATED


   //deprecated

  
  /** Updates the style context of @a widget and all descendants
   * by updating its widget path. Gtk::Containers may want
   * to use this on a child when reordering it in a way that a different
   * style might apply to it. See also Gtk::Container::get_path_for_child().
   * 
   * @newin{3,0}
   */
  void reset_style();

  //The parameter name is "the_property_name" to avoid a warning because there is a method with the "property_name" name.
  /** Gets the value of a style property of @a widget.
   * @param the_property_name The name of a style property.
   * @param value Location to return the property value.
   */
  template <class PropertyType>
  void get_style_property(const Glib::ustring& the_property_name, PropertyType& value) const;

  
  /** Creates a new Pango::Context with the appropriate font map,
   * font options, font description, and base direction for drawing
   * text for this widget. See also get_pango_context().
   * 
   * @return The new Pango::Context.
   */
  Glib::RefPtr<Pango::Context> create_pango_context();
  
  /** Gets a Pango::Context with the appropriate font map, font description,
   * and base direction for this widget. Unlike the context returned
   * by create_pango_context(), this context is owned by
   * the widget (it can be used until the screen for the widget changes
   * or the widget is removed from its toplevel), and will be updated to
   * match any changes to the widget’s attributes. This can be tracked
   * by using the Gtk::Widget::signal_screen_changed() signal on the widget.
   * 
   * @return The Pango::Context for the widget.
   */
  Glib::RefPtr<Pango::Context> get_pango_context();

  
  /** Sets the #cairo_font_options_t used for Pango rendering in this widget.
   * When not set, the default font options for the Gdk::Screen will be used.
   * 
   * @newin{3,18}
   * 
   * @param options A #cairo_font_options_t, or <tt>nullptr</tt> to unset any
   * previously set default font options.
   */
  void set_font_options(const ::Cairo::FontOptions& options);
  /** Undoes the effect of previous calls to set_font_options().
   *
   * @newin{3,20}
   */
  void unset_font_options();
  // This returns a const, so we assume that we must copy it:
   

  /** Returns the #cairo_font_options_t used for Pango rendering. When not set,
   * the defaults font options for the Gdk::Screen will be used.
   * 
   * @newin{3,18}
   * 
   * @return The #cairo_font_options_t or <tt>nullptr</tt> if not set.
   */
  ::Cairo::FontOptions get_font_options() const;

  
  /** Creates a new Pango::Layout with the appropriate font map,
   * font description, and base direction for drawing text for
   * this widget.
   * 
   * If you keep a Pango::Layout created in this way around, you need
   * to re-create it when the widget Pango::Context is replaced.
   * This can be tracked by using the Gtk::Widget::signal_screen_changed() signal
   * on the widget.
   * 
   * @param text Text to set on the layout (can be <tt>nullptr</tt>).
   * @return The new Pango::Layout.
   */
  Glib::RefPtr<Pango::Layout> create_pango_layout(const Glib::ustring& text);

   //deprecated.
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** A convenience function that uses the theme engine and style
   * settings for @a widget to look up @a stock_id and render it to
   * a pixbuf. @a stock_id should be a stock icon ID such as
   * Gtk::STOCK_OPEN or Gtk::STOCK_OK. @a size should be a size
   * such as Gtk::ICON_SIZE_MENU.
   * 
   * The pixels in the returned Gdk::Pixbuf are shared with the rest of
   * the application and should not be modified. The pixbuf should be freed
   * after use with Glib::object_unref().
   * 
   * @newin{3,0}
   * 
   * Deprecated: 3.10: Use Gtk::IconTheme::load_icon() instead.
   * 
   * @deprecated Use IconTheme::load_icon() instead.
   * 
   * @param stock_id A stock ID.
   * @param size A stock size (Gtk::IconSize). A size of `(GtkIconSize)-1`
   * means render at the size of the source and don’t scale (if there are
   * multiple source sizes, GTK+ picks one of the available sizes).
   * @return A new pixbuf, or <tt>nullptr</tt> if the
   * stock ID wasn’t known.
   */
  Glib::RefPtr<Gdk::Pixbuf> render_icon_pixbuf(const StockID& stock_id, IconSize size);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets a widgets composite name. The widget must be
   * a composite child of its parent; see push_composite_child().
   * 
   * Deprecated: 3.10: Use class_set_template(), or don’t use this API at all.
   * 
   * @deprecated Use gtk_widget_class_set_template(), or don't use this API at all.
   * 
   * @param name The name to set.
   */
  void set_composite_name(const Glib::ustring& name);
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED
  /** @deprecated Use gtk_widget_class_set_template(), or don't use this API at all.
   */
  void unset_composite_name();
#endif // GTKMM_DISABLE_DEPRECATED
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Obtains the composite name of a widget.
   * 
   * Deprecated: 3.10: Use class_set_template(), or don’t use this API at all.
   * 
   * @deprecated Use gtk_widget_class_set_template(), or don't use this API at all.
   * 
   * @return The composite name of @a widget, or an empty string if @a widget is not
   * a composite child.
   */
  Glib::ustring get_composite_name() const;
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Makes all newly-created widgets as composite children until
   * the corresponding pop_composite_child() call.
   * 
   * A composite child is a child that’s an implementation detail of the
   * container it’s inside and should not be visible to people using the
   * container. Composite children aren’t treated differently by GTK+ (but
   * see Gtk::Container::foreach() vs. Gtk::Container::forall()), but e.g. GUI
   * builders might want to treat them in a different way.
   * 
   * Deprecated: 3.10: This API never really worked well and was mostly unused, now
   * we have a more complete mechanism for composite children, see class_set_template().
   * 
   * @deprecated This API never really worked well and was mostly unused, now we have a more complete mechanism for composite children, see gtk_widget_class_set_template().
   */
  static void push_composite_child();
#endif // GTKMM_DISABLE_DEPRECATED


#ifndef GTKMM_DISABLE_DEPRECATED

  /** Cancels the effect of a previous call to push_composite_child().
   * 
   * Deprecated: 3.10: Use class_set_template(), or don’t use this API at all.
   * 
   * @deprecated Use gtk_widget_class_set_template(), or don't use this API at all.
   */
  static void pop_composite_child();
#endif // GTKMM_DISABLE_DEPRECATED


/* Directionality of Text */

  
  /** Sets the reading direction on a particular widget. This direction
   * controls the primary direction for widgets containing text,
   * and also the direction in which the children of a container are
   * packed. The ability to set the direction is present in order
   * so that correct localization into languages with right-to-left
   * reading directions can be done. Generally, applications will
   * let the default reading direction present, except for containers
   * where the containers are arranged in an order that is explicitly
   * visual rather than logical (such as buttons for text justification).
   * 
   * If the direction is set to Gtk::TEXT_DIR_NONE, then the value
   * set by set_default_direction() will be used.
   * 
   * @param dir The new direction.
   */
  void set_direction(TextDirection dir);
  
  /** Gets the reading direction for a particular widget. See
   * set_direction().
   * 
   * @return The reading direction for the widget.
   */
  TextDirection get_direction() const;

  
  /** Sets the default reading direction for widgets where the
   * direction has not been explicitly set by set_direction().
   * 
   * @param dir The new default direction. This cannot be
   * Gtk::TEXT_DIR_NONE.
   */
  static void set_default_direction(TextDirection dir);
  
  /** Obtains the current default reading direction. See
   * set_default_direction().
   * 
   * @return The current default direction.
   */
  static TextDirection get_default_direction();

  
  /** Sets a shape for this widget’s GDK window. This allows for
   * transparent windows etc., see gdk_window_shape_combine_region()
   * for more information.
   * 
   * @newin{3,0}
   * 
   * @param region Shape to be added, or <tt>nullptr</tt> to remove an existing shape.
   */
  void shape_combine_region(const ::Cairo::RefPtr<const ::Cairo::Region>& region);
  
  /** Sets an input shape for this widget’s GDK window. This allows for
   * windows which react to mouse click in a nonrectangular region, see
   * gdk_window_input_shape_combine_region() for more information.
   * 
   * @newin{3,0}
   * 
   * @param region Shape to be added, or <tt>nullptr</tt> to remove an existing shape.
   */
  void input_shape_combine_region(const ::Cairo::RefPtr<const ::Cairo::Region>& region);

  
  /** Returns the Gtk::WidgetPath representing @a widget, if the widget
   * is not connected to a toplevel widget, a partial path will be
   * created.
   * 
   * @return The Gtk::WidgetPath representing @a widget.
   */
  WidgetPath get_path() const;
   //deprecated

 
  /** Returns a newly allocated list of the widgets, normally labels, for
   * which this widget is the target of a mnemonic (see for example,
   * Gtk::Label::set_mnemonic_widget()).
   * 
   * The widgets in the list are not individually referenced. If you
   * want to iterate through the list and perform actions involving
   * callbacks that might destroy the widgets, you
   * must call `g_list_foreach (result,
   * (GFunc)g_object_ref, <tt>nullptr</tt>)` first, and then unref all the
   * widgets afterwards.
   * 
   * @newin{2,4}
   * 
   * @return The list of
   * mnemonic labels; free this list
   * with Glib::list_free() when you are done with it.
   */
  std::vector<Widget*> list_mnemonic_labels();
 

  /** Returns a newly allocated list of the widgets, normally labels, for
   * which this widget is the target of a mnemonic (see for example,
   * Gtk::Label::set_mnemonic_widget()).
   * 
   * The widgets in the list are not individually referenced. If you
   * want to iterate through the list and perform actions involving
   * callbacks that might destroy the widgets, you
   * must call `g_list_foreach (result,
   * (GFunc)g_object_ref, <tt>nullptr</tt>)` first, and then unref all the
   * widgets afterwards.
   * 
   * @newin{2,4}
   * 
   * @return The list of
   * mnemonic labels; free this list
   * with Glib::list_free() when you are done with it.
   */
  std::vector<const Widget*> list_mnemonic_labels() const;
 
  /** Adds a widget to the list of mnemonic labels for
   * this widget. (See list_mnemonic_labels()). Note the
   * list of mnemonic labels for the widget is cleared when the
   * widget is destroyed, so the caller must make sure to update
   * its internal state at this point as well.
   * 
   * @newin{2,4}
   * 
   * @param label A Gtk::Widget that acts as a mnemonic label for @a widget.
   */
  void add_mnemonic_label(Widget& label);
 
  /** Removes a widget from the list of mnemonic labels for
   * this widget. (See list_mnemonic_labels()). The widget
   * must have previously been added to the list with
   * add_mnemonic_label().
   * 
   * @newin{2,4}
   * 
   * @param label A Gtk::Widget that was previously set as a mnemonic label for
   *  @a widget with add_mnemonic_label().
   */
  void remove_mnemonic_label(Widget& label);

  //TODO: Should drag_get_data() be const?
  
  /** @param context The drag context.
   * @param target The target (form of the data) to retrieve.
   * @param time A timestamp for retrieving the data. This will
   * generally be the time received in a Gtk::Widget::signal_drag_motion()"
   * or Gtk::Widget::signal_drag_drop()" signal.
   */
  void drag_get_data(const Glib::RefPtr<Gdk::DragContext>& context, const Glib::ustring& target, guint32 time);

  
  /** 
   */
  void drag_highlight();
  
  /** 
   */
  void drag_unhighlight();

  //TODO: Change the defaults? Maybe we should use ALL for DestDefaults. See other drag_dest_set() methods here and in other widgets.
  void drag_dest_set(DestDefaults flags = DestDefaults(0), Gdk::DragAction actions = Gdk::DragAction(0));
  void drag_dest_set(const std::vector<TargetEntry>& targets, DestDefaults flags = DEST_DEFAULT_ALL, Gdk::DragAction actions = Gdk::ACTION_COPY);
  

  /** @param proxy_window The window to which to forward drag events.
   * @param protocol The drag protocol which the @a proxy_window accepts
   * (You can use gdk_drag_get_protocol() to determine this).
   * @param use_coordinates If <tt>true</tt>, send the same coordinates to the
   * destination, because it is an embedded
   * subwindow.
   */
  void drag_dest_set_proxy(const Glib::RefPtr<Gdk::Window>& proxy_window, Gdk::DragProtocol protocol, bool use_coordinates);
  
  /** 
   */
  void drag_dest_unset();
  
  /** Looks for a match between @a context-&gt;targets and the
   *  @a dest_target_list, returning the first matching target, otherwise
   * returning Gdk::NONE. @a dest_target_list should usually be the return
   * value from gtk_drag_dest_get_target_list(), but some widgets may
   * have different valid targets for different parts of the widget; in
   * that case, they will have to implement a drag_motion handler that
   * passes the correct target list to this function.
   * 
   * @param context Drag context.
   * @param target_list List of droppable targets.
   * @return First target that the source offers and the dest can accept, or Gdk::NONE.
   */
  Glib::ustring drag_dest_find_target(const Glib::RefPtr<Gdk::DragContext>& context, const Glib::RefPtr<TargetList>& target_list) const;
  Glib::ustring drag_dest_find_target(const Glib::RefPtr<Gdk::DragContext>& context) const;

  
  /** 
   */
  Glib::RefPtr<TargetList> drag_dest_get_target_list();
  
  /** 
   */
  Glib::RefPtr<const TargetList> drag_dest_get_target_list() const;
  
  /** @param target_list List of droppable targets, or <tt>nullptr</tt> for none.
   */
  void drag_dest_set_target_list(const Glib::RefPtr<TargetList>& target_list);

  
  /** 
   */
  void drag_dest_add_text_targets();
  
  /** 
   */
  void drag_dest_add_image_targets();
  
  /** 
   */
  void drag_dest_add_uri_targets();

  void drag_source_set(const std::vector<TargetEntry>& targets, Gdk::ModifierType start_button_mask = Gdk::MODIFIER_MASK, Gdk::DragAction actions = Gdk::ACTION_COPY);
  

  /** Undoes the effects of gtk_drag_source_set().
   */
  void drag_source_unset();

  
  /** Sets the icon that will be used for drags from a particular widget
   * from a Gdk::Pixbuf. GTK+ retains a reference for @a pixbuf and will 
   * release it when it is no longer needed.
   * 
   * @param pixbuf The Gdk::Pixbuf for the drag icon.
   */
  void drag_source_set_icon(const Glib::RefPtr<Gdk::Pixbuf>& pixbuf);
  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** Sets the icon that will be used for drags from a particular source
   * to a stock icon.
   * 
   * Deprecated: 3.10: Use gtk_drag_source_set_icon_name() instead.
   * 
   * @deprecated Use the drag_source_set_icon() that takes a Glib::ustring instead.
   * 
   * @param stock_id The ID of the stock icon to use.
   */
  void drag_source_set_icon(const StockID& stock_id);
#endif // GTKMM_DISABLE_DEPRECATED


  /** Sets the icon that will be used for drags from a particular source
   * to a themed icon. See the docs for Gtk::IconTheme for more details.
   * 
   * @newin{2,8}
   * 
   * @param icon_name Name of icon to use.
   */
  void drag_source_set_icon(const Glib::ustring& icon_name);

  
  /** Add the text targets supported by Gtk::SelectionData to
   * the target list of the drag source.  The targets
   * are added with @a info = 0. If you need another value, 
   * use Gtk::TargetList::add_text_targets() and
   * gtk_drag_source_set_target_list().
   * 
   * @newin{2,6}
   */
  void drag_source_add_text_targets();
  
  /** Add the URI targets supported by Gtk::SelectionData to
   * the target list of the drag source.  The targets
   * are added with @a info = 0. If you need another value, 
   * use Gtk::TargetList::add_uri_targets() and
   * gtk_drag_source_set_target_list().
   * 
   * @newin{2,6}
   */
  void drag_source_add_uri_targets();
  
  /** Add the writable image targets supported by Gtk::SelectionData to
   * the target list of the drag source. The targets
   * are added with @a info = 0. If you need another value, 
   * use Gtk::TargetList::add_image_targets() and
   * gtk_drag_source_set_target_list().
   * 
   * @newin{2,6}
   */
  void drag_source_add_image_targets();

  
#ifndef GTKMM_DISABLE_DEPRECATED

  /** @deprecated Use the drag_begin() that takes x,y coordinates.
   * 
   * @param targets The targets (data formats) in which the
   * source can provide the data.
   * @param actions A bitmask of the allowed drag actions for this drag.
   * @param button The button the user clicked to start the drag.
   * @param gdk_event The event that triggered the start of the drag.
   */
  Glib::RefPtr<Gdk::DragContext> drag_begin(const Glib::RefPtr<TargetList>& targets, Gdk::DragAction actions, int button, GdkEvent* gdk_event);
#endif // GTKMM_DISABLE_DEPRECATED


  /** 
   */
  Glib::RefPtr<Gdk::DragContext> drag_begin(const Glib::RefPtr<TargetList>& targets, Gdk::DragAction actions, int button, GdkEvent* gdk_event, int x, int y);
  
  /** @param start_x X coordinate of start of drag.
   * @param start_y Y coordinate of start of drag.
   * @param current_x Current X coordinate.
   * @param current_y Current Y coordinate.
   */
  bool drag_check_threshold(int start_x, int start_y, int current_x, int current_y);

  //These should be a method of Gdk::DragContext, but gdkmm can't depend on gtkmm.
  static Widget* drag_get_source_widget(const Glib::RefPtr<Gdk::DragContext>& context);
  void drag_set_as_icon(const Glib::RefPtr<Gdk::DragContext>& context, int hot_x, int hot_y);

  
  /** This function works like queue_resize(),
   * except that the widget is not invalidated.
   * 
   * @newin{2,4}
   */
  void queue_resize_no_redraw();
  //TODO: _WRAP_METHOD(GdkFrameClock* get_frame_clock(), gtk_widget_get_frame_clock)
  
  /** Returns the current value of the Gtk::Widget::property_no_show_all() property,
   * which determines whether calls to show_all()
   * will affect this widget.
   * 
   * @newin{2,4}
   * 
   * @return The current value of the “no-show-all” property.
   */
  bool get_no_show_all() const;
  
  /** Sets the Gtk::Widget::property_no_show_all() property, which determines whether
   * calls to show_all() will affect this widget.
   * 
   * This is mostly for use in constructing widget hierarchies with externally
   * controlled visibility, see Gtk::UIManager.
   * 
   * @newin{2,4}
   * 
   * @param no_show_all The new value for the “no-show-all” property.
   */
  void set_no_show_all(bool no_show_all =  true);

  //Used when implementing containers:
  
  /** This function is useful only when implementing subclasses of
   * Gtk::Container.
   * Sets the container as the parent of @a widget, and takes care of
   * some details such as updating the state and style of the child
   * to reflect its new location. The opposite function is
   * unparent().
   * 
   * @param parent Parent container.
   */
  void set_parent(Widget& parent);
  
  /** This function is only for use in widget implementations.
   * Should be called by implementations of the remove method
   * on Gtk::Container, to dissociate a child from the container.
   */
  void unparent();

  //TODO: When exactly do we need to custom containers need to call map() on the child widgets?
  //Most containers that derive from GtkContainer do not need to, but GtkNotebook does.
  
  /** This function is only for use in widget implementations. Causes
   * a widget to be mapped if it isn’t already.
   */
  void map();
  
  /** This function is only for use in widget implementations. Causes
   * a widget to be unmapped if it’s currently mapped.
   */
  void unmap();

#ifndef GTKMM_DISABLE_DEPRECATED
  /** Draws a text caret on @a cr at @a location.
   * This is not a style function but merely a convenience function for drawing
   * the standard cursor shape.
   *
   * @deprecated Use StyleContext::render_insertion_cursor() instead.
   */
  void draw_insertion_cursor(const ::Cairo::RefPtr< ::Cairo::Context>& cr, const Gdk::Rectangle& location, bool is_primary, TextDirection direction, bool draw_arrow = true);
#endif // GTKMM_DISABLE_DEPRECATED
  

  // Gtk+ 2.12 tooltip API
  
  /** Replaces the default, usually yellow, window used for displaying
   * tooltips with @a custom_window. GTK+ will take care of showing and
   * hiding @a custom_window at the right moment, to behave likewise as
   * the default tooltip window. If @a custom_window is <tt>nullptr</tt>, the default
   * tooltip window will be used.
   * 
   * If the custom window should have the default theming it needs to
   * have the name “gtk-tooltip”, see set_name().
   * 
   * @newin{2,12}
   * 
   * @param custom_window A Gtk::Window, or <tt>nullptr</tt>.
   */
  void set_tooltip_window(Window& custom_window);
  
  /** Returns the Gtk::Window of the current tooltip. This can be the
   * GtkWindow created by default, or the custom tooltip window set
   * using set_tooltip_window().
   * 
   * @newin{2,12}
   * 
   * @return The Gtk::Window of the current tooltip.
   */
  Window* get_tooltip_window();
  
  /** Triggers a tooltip query on the display where the toplevel of @a widget
   * is located. See Gtk::Tooltip::trigger_tooltip_query() for more
   * information.
   * 
   * @newin{2,12}
   */
  void trigger_tooltip_query();
  
  /** Sets @a text as the contents of the tooltip. This function will take
   * care of setting Gtk::Widget::property_has_tooltip() to <tt>true</tt> and of the default
   * handler for the Gtk::Widget::signal_query_tooltip() signal.
   * 
   * See also the Gtk::Widget::property_tooltip_text() property and Gtk::Tooltip::set_text().
   * 
   * @newin{2,12}
   * 
   * @param text The contents of the tooltip for @a widget.
   */
  void set_tooltip_text(const Glib::ustring& text);
  
  /** Gets the contents of the tooltip for @a widget.
   * 
   * @newin{2,12}
   * 
   * @return The tooltip text.
   */
  Glib::ustring get_tooltip_text() const;
  
  /** Sets @a markup as the contents of the tooltip, which is marked up with
   * the Pango text markup language.
   * 
   * This function will take care of setting GtkWidget:has-tooltip to <tt>true</tt>
   * and of the default handler for the GtkWidget::query-tooltip signal.
   * 
   * See also the GtkWidget:tooltip-markup property and
   * Gtk::Tooltip::set_markup().
   * 
   * @newin{2,12}
   * 
   * @param markup The contents of the tooltip for @a widget.
   */
  void set_tooltip_markup(const Glib::ustring& markup);
  
  /** Gets the contents of the tooltip for @a widget.
   * 
   * @newin{2,12}
   * 
   * @return The tooltip text.
   */
  Glib::ustring get_tooltip_markup() const;
  
  /** Sets the has-tooltip property on @a widget to @a has_tooltip.  See
   * Gtk::Widget::property_has_tooltip() for more information.
   * 
   * @newin{2,12}
   * 
   * @param has_tooltip Whether or not @a widget has a tooltip.
   */
  void set_has_tooltip(bool has_tooltip =  TRUE);
  
  /** Returns the current value of the has-tooltip property.  See
   * Gtk::Widget::property_has_tooltip() for more information.
   * 
   * @newin{2,12}
   * 
   * @return Current value of has-tooltip on @a widget.
   */
  bool get_has_tooltip() const;

  int get_width() const;
  int get_height() const;

  
  /** Whether @a widget can rely on having its alpha channel
   * drawn correctly. On X11 this function returns whether a
   * compositing manager is running for @a widget’s screen.
   * 
   * Please note that the semantics of this call will change
   * in the future if used on a widget that has a composited
   * window in its hierarchy (as set by gdk_window_set_composited()).
   * 
   * @newin{2,10}
   * 
   * @return <tt>true</tt> if the widget can rely on its alpha
   * channel being drawn correctly.
   */
  bool is_composited() const;

  
  /** Returns whether the widget is currently being destroyed.
   * This information can sometimes be used to avoid doing
   * unnecessary work.
   * 
   * @return <tt>true</tt> if @a widget is being destroyed.
   */
  bool in_destruction() const;

  
  /** Returns the style context associated to @a widget. The returned object is
   * guaranteed to be the same for the lifetime of @a widget.
   * 
   * @return A Gtk::StyleContext. This memory is owned by @a widget and
   * must not be freed.
   */
  Glib::RefPtr<StyleContext> get_style_context();
  
  /** Returns the style context associated to @a widget. The returned object is
   * guaranteed to be the same for the lifetime of @a widget.
   * 
   * @return A Gtk::StyleContext. This memory is owned by @a widget and
   * must not be freed.
   */
  Glib::RefPtr<Gtk::StyleContext> get_style_context() const;

  
  /** Returns the modifier mask the @a widget’s windowing system backend
   * uses for a particular purpose.
   * 
   * See gdk_keymap_get_modifier_mask().
   * 
   * @newin{3,4}
   * 
   * @param intent The use case for the modifier mask.
   * @return The modifier mask used for @a intent.
   */
  Gdk::ModifierType get_modifier_mask(Gdk::ModifierIntent intent);

//TODO: guint gtk_widget_add_tick_callback (GtkWidget *widget,  GtkTickCallback callback, gpointer user_data, GDestroyNotify   notify);
//TODO: void gtk_widget_remove_tick_callback (GtkWidget *widget,  guint id);

  //This is mostly only needed by the class itself, so it could be protected,
  //but it is sometimes helpful to call it from outside:
  
  /** Inserts @a group into @a widget. Children of @a widget that implement
   * Gtk::Actionable can then be associated with actions in @a group by
   * setting their “action-name” to
   *  @a prefix.`action-name`.
   * 
   * If @a group is <tt>nullptr</tt>, a previously inserted group for @a name is removed
   * from @a widget.
   * 
   * @newin{3,6}
   * 
   * @param name The prefix for actions in @a group.
   * @param group A ActionGroup, or <tt>nullptr</tt>.
   */
  void insert_action_group(const Glib::ustring& name, const Glib::RefPtr<Gio::ActionGroup>& group);

  /** Removes a group from the widget.
   * See insert_action_group().
   *
   * @param name The prefix for actions.
   *
   * @newin{3,10}
   */
  void remove_action_group(const Glib::ustring& name);

  
  /** Retrieves the ActionGroup that was registered using @a prefix. The resulting
   * ActionGroup may have been registered to @a widget or any Gtk::Widget in its
   * ancestry.
   * 
   * If no action group was found matching @a prefix, then <tt>nullptr</tt> is returned.
   * 
   * @newin{3,16}
   * 
   * @param prefix The “prefix” of the action group.
   * @return A ActionGroup or <tt>nullptr</tt>.
   */
  Glib::RefPtr<Gio::ActionGroup> get_action_group(const Glib::ustring& prefix);
  
  /** Retrieves the ActionGroup that was registered using @a prefix. The resulting
   * ActionGroup may have been registered to @a widget or any Gtk::Widget in its
   * ancestry.
   * 
   * If no action group was found matching @a prefix, then <tt>nullptr</tt> is returned.
   * 
   * @newin{3,16}
   * 
   * @param prefix The “prefix” of the action group.
   * @return A ActionGroup or <tt>nullptr</tt>.
   */
  Glib::RefPtr<const Gio::ActionGroup> get_action_group(const Glib::ustring& prefix) const;

 
  /** Retrieves a <tt>nullptr</tt>-terminated array of strings containing the prefixes of
   * ActionGroup's available to @a widget.
   * 
   * @newin{3,16}
   * 
   * @return A <tt>nullptr</tt>-terminated array of strings.
   */
  std::vector<Glib::ustring> list_action_prefixes() const;

  
  /** Sets the font map to use for Pango rendering. When not set, the widget
   * will inherit the font map from its parent.
   * 
   * @newin{3,18}
   * 
   * @param font_map A Pango::FontMap, or <tt>nullptr</tt> to unset any previously
   * set font map.
   */
  void set_font_map(const Glib::RefPtr<Pango::FontMap>& font_map);
  
  /** Gets the font map that has been set with set_font_map().
   * 
   * @newin{3,18}
   * 
   * @return A Pango::FontMap, or <tt>nullptr</tt>.
   */
  Glib::RefPtr<Pango::FontMap> get_font_map();
  
  /** Gets the font map that has been set with set_font_map().
   * 
   * @newin{3,18}
   * 
   * @return A Pango::FontMap, or <tt>nullptr</tt>.
   */
  Glib::RefPtr<const Pango::FontMap> get_font_map() const;

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%show()</tt>
   *
   * The signal_show() signal is emitted when @a widget is shown, for example with
   * Gtk::Widget::show().
   */

  Glib::SignalProxy< void > signal_show();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%hide()</tt>
   *
   * The signal_hide() signal is emitted when @a widget is hidden, for example with
   * Gtk::Widget::hide().
   */

  Glib::SignalProxy< void > signal_hide();


  /// Emitted on mapping of a widget to the screen.
  //- See {flags.mapped}.
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%map()</tt>
   *
   * The signal_map() signal is emitted when @a widget is going to be mapped, that is
   * when the widget is visible (which is controlled with
   * Gtk::Widget::set_visible()) and all its parents up to the toplevel widget
   * are also visible. Once the map has occurred, Gtk::Widget::signal_map_event() will
   * be emitted.
   * 
   * The signal_map() signal can be used to determine whether a widget will be drawn,
   * for instance it can resume an animation that was stopped during the
   * emission of Gtk::Widget::signal_unmap().
   */

  Glib::SignalProxy< void > signal_map();


  //- See {flags.mapped}.
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%unmap()</tt>
   *
   * The signal_unmap() signal is emitted when @a widget is going to be unmapped, which
   * means that either it or any of its parents up to the toplevel widget have
   * been set as hidden.
   * 
   * As signal_unmap() indicates that a widget will not be shown any longer, it can be
   * used to, for example, stop an animation on the widget.
   */

  Glib::SignalProxy< void > signal_unmap();


  /// Emitted on realization of a widget.
  //- See {flags.realized}.  This is also responsible for
  //- setting {flags.realized} when it is done.  Therefore,
  //- when overriding the impl method, you should call the
  //- default realize method.
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%realize()</tt>
   *
   * The signal_realize() signal is emitted when @a widget is associated with a
   * Gdk::Window, which means that Gtk::Widget::realize() has been called or the
   * widget has been mapped (that is, it is going to be drawn).
   */

  Glib::SignalProxy< void > signal_realize();


  //- See {flags.realized}.  This should not be called by the user.
  //__WRAP(meth|sig|impl,void unrealize_(),gtk_widget_unrealize,"unrealize")
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%unrealize()</tt>
   *
   * The signal_unrealize() signal is emitted when the Gdk::Window associated with
   *  @a widget is destroyed, which means that Gtk::Widget::unrealize() has been
   * called or the widget has been unmapped (that is, it is going to be
   * hidden).
   */

  Glib::SignalProxy< void > signal_unrealize();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%size_allocate(Allocation& allocation)</tt>
   *
   * @param allocation The region which has been
   * allocated to the widget.
   */

  Glib::SignalProxy< void,Allocation& > signal_size_allocate();


// Changed signals -- inform widget of internal changes.
// We rename parent_set => parent_changed
//  and      style_set  => style_changed
//  to avoid confusion with set_parent and set_style.

  
#ifndef GTKMM_DISABLE_DEPRECATED

  /**
   * @par Slot Prototype:
   * <tt>void on_my_%state_changed(Gtk::StateType previous_state)</tt>
   *
   * The signal_state_changed() signal is emitted when the widget state changes.
   * See Gtk::Widget::get_state().
   * 
   * Deprecated: 3.0: Use Gtk::Widget::signal_state_flags_changed() instead.
   * 
   * @deprecated Use signal_state_flags_changed() instead.
   * 
   * @param previous_state The previous state.
   */

  Glib::SignalProxy< void,Gtk::StateType > signal_state_changed();
#endif // GTKMM_DISABLE_DEPRECATED


  //TODO: Remove no_default_handler when we can break ABI:
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%state_flags_changed(Gtk::StateFlags previous_state_flags)</tt>
   *
   * The signal_state_flags_changed() signal is emitted when the widget state
   * changes, see Gtk::Widget::get_state_flags().
   * 
   * @newin{3,0}
   * 
   * @param previous_state_flags The previous state flags.
   */

  Glib::SignalProxy< void,Gtk::StateFlags > signal_state_flags_changed();


  /// Informs objects that their parent changed.
  //- The widget passed is the former parent, which may be 0 if
  //- there was no parent. (was parent_set in GTK+)
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%parent_changed(Widget* previous_parent)</tt>
   *
   * The signal_parent_set() signal is emitted when a new parent
   * has been set on a widget.
   * 
   * @param previous_parent The previous parent, or <tt>nullptr</tt> if the widget
   * just got its initial parent.
   */

  Glib::SignalProxy< void,Widget* > signal_parent_changed();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%hierarchy_changed(Widget* previous_toplevel)</tt>
   *
   * The signal_hierarchy_changed() signal is emitted when the
   * anchored state of a widget changes. A widget is
   * “anchored” when its toplevel
   * ancestor is a Gtk::Window. This signal is emitted when
   * a widget changes from un-anchored to anchored or vice-versa.
   * 
   * @param previous_toplevel The previous toplevel ancestor, or <tt>nullptr</tt>
   * if the widget was previously unanchored.
   */

  Glib::SignalProxy< void,Widget* > signal_hierarchy_changed();


   //uses deprecated GtkStyle.
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%style_updated()</tt>
   *
   * The signal_style_updated() signal is a convenience signal that is emitted when the
   * Gtk::StyleContext::signal_changed() signal is emitted on the @a widget's associated
   * Gtk::StyleContext as returned by Gtk::Widget::get_style_context().
   * 
   * Note that style-modifying functions like Gtk::Widget::override_color() also
   * cause this signal to be emitted.
   * 
   * @newin{3,0}
   */

  Glib::SignalProxy< void > signal_style_updated();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%direction_changed(TextDirection direction)</tt>
   *
   * The signal_direction_changed() signal is emitted when the text direction
   * of a widget changes.
   * 
   * @param direction The previous text direction of @a widget.
   */

  Glib::SignalProxy< void,TextDirection > signal_direction_changed();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%grab_notify(bool was_grabbed)</tt>
   *
   * The signal_grab_notify() signal is emitted when a widget becomes
   * shadowed by a GTK+ grab (not a pointer or keyboard grab) on
   * another widget, or when it becomes unshadowed due to a grab
   * being removed.
   * 
   * A widget is shadowed by a gtk_grab_add() when the topmost
   * grab widget in the grab stack of its window group is not
   * its ancestor.
   * 
   * @param was_grabbed <tt>false</tt> if the widget becomes shadowed, <tt>true</tt>
   * if it becomes unshadowed.
   */

  Glib::SignalProxy< void,bool > signal_grab_notify();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%child_notify(GParamSpec* pspec)</tt>
   *
   * The signal_child_notify() signal is emitted for each
   * [child property][child-properties]  that has
   * changed on an object. The signal's detail holds the property name.
   * 
   * @param pspec The ParamSpec of the changed child property.
   */

  Glib::SignalProxy< void,GParamSpec* > signal_child_notify();


  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%mnemonic_activate(bool group_cycling)</tt>
   *
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,bool > signal_mnemonic_activate();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%grab_focus()</tt>
   *
   * 
   */

  Glib::SignalProxy< void > signal_grab_focus();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%focus(DirectionType direction)</tt>
   *
   * @return <tt>true</tt> to stop other handlers from being invoked for the event. <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,DirectionType > signal_focus();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%event(GdkEvent* gdk_event)</tt>
   *
   * The GTK+ main loop will emit three signals for each GDK event delivered
   * to a widget: one generic signal_event() signal, another, more specific,
   * signal that matches the type of event delivered (e.g.\ Gtk::Widget::signal_key_press_event()) and finally a generic
   * Gtk::Widget::signal_event_after() signal.
   * 
   * @param gdk_event The Gdk::Event which triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event
   * and to cancel the emission of the second specific signal_event() signal.
   * <tt>false</tt> to propagate the event further and to allow the emission of
   * the second signal. The signal_event_after() signal is emitted regardless of
   * the return value.
   */

  Glib::SignalProxy< bool,GdkEvent* > signal_event();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%event_after(GdkEvent* gdk_event)</tt>
   *
   * After the emission of the Gtk::Widget::signal_event() signal and (optionally)
   * the second more specific signal, signal_event_after() will be emitted
   * regardless of the previous two signals handlers return values.
   * 
   * @param gdk_event The Gdk::Event which triggered this signal.
   */

  Glib::SignalProxy< void,GdkEvent* > signal_event_after();


  /** Event triggered by user pressing button.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%button_press_event(GdkEventButton* button_event)</tt>
   *
   * The signal_button_press_event() signal will be emitted when a button
   * (typically from a mouse) is pressed.
   * 
   * To receive this signal, the Gdk::Window associated to the
   * widget needs to enable the Gdk::BUTTON_PRESS_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param button_event The Gdk::EventButton which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventButton* > signal_button_press_event();


  /** Event triggered by user releasing button.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%button_release_event(GdkEventButton* release_event)</tt>
   *
   * The signal_button_release_event() signal will be emitted when a button
   * (typically from a mouse) is released.
   * 
   * To receive this signal, the Gdk::Window associated to the
   * widget needs to enable the Gdk::BUTTON_RELEASE_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param release_event The Gdk::EventButton which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventButton* > signal_button_release_event();


  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%scroll_event(GdkEventScroll* scroll_event)</tt>
   *
   * The signal_scroll_event() signal is emitted when a button in the 4 to 7
   * range is pressed. Wheel mice are usually configured to generate
   * button press events for buttons 4 and 5 when the wheel is turned.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::SCROLL_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param scroll_event The Gdk::EventScroll which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventScroll* > signal_scroll_event();


  /** Event triggered by user moving pointer.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%motion_notify_event(GdkEventMotion* motion_event)</tt>
   *
   * The signal_motion_notify_event() signal is emitted when the pointer moves
   * over the widget's Gdk::Window.
   * 
   * To receive this signal, the Gdk::Window associated to the widget
   * needs to enable the Gdk::POINTER_MOTION_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param motion_event The Gdk::EventMotion which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventMotion* > signal_motion_notify_event();


  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%delete_event(GdkEventAny* any_event)</tt>
   *
   * The signal_delete_event() signal is emitted if a user requests that
   * a toplevel window is closed. The default handler for this signal
   * destroys the window. Connecting Gtk::Widget::hide_on_delete() to
   * this signal will cause the window to be hidden instead, so that
   * it can later be shown again without reconstructing it.
   * 
   * @param any_event The event which triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventAny* > signal_delete_event();


  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%draw(const ::Cairo::RefPtr< ::Cairo::Context>& cr)</tt>
   *
   * This signal is emitted when a widget is supposed to render itself.
   * The @a widget's top left corner must be painted at the origin of
   * the passed in context and be sized to the values returned by
   * Gtk::Widget::get_allocated_width() and
   * Gtk::Widget::get_allocated_height().
   * 
   * Signal handlers connected to this signal can modify the cairo
   * context passed as @a cr in any way they like and don't need to
   * restore it. The signal emission takes care of calling cairo_save()
   * before and cairo_restore() after invoking the handler.
   * 
   * The signal handler will get a @a cr with a clip region already set to the
   * widget's dirty region, i.e. to the area that needs repainting.  Complicated
   * widgets that want to avoid redrawing themselves completely can get the full
   * extents of the clip region with gdk_cairo_get_clip_rectangle(), or they can
   * get a finer-grained representation of the dirty region with
   * cairo_copy_clip_rectangle_list().
   * 
   * @newin{3,0}
   * 
   * @param cr The cairo context to draw to.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,const ::Cairo::RefPtr< ::Cairo::Context>& > signal_draw();


  /** Event triggered by a key press will widget has focus.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%key_press_event(GdkEventKey* key_event)</tt>
   *
   * The signal_key_press_event() signal is emitted when a key is pressed. The signal
   * emission will reoccur at the key-repeat rate when the key is kept pressed.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::KEY_PRESS_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param key_event The Gdk::EventKey which triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventKey* > signal_key_press_event();


  /** Event triggered by a key release will widget has focus.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%key_release_event(GdkEventKey* key_event)</tt>
   *
   * The signal_key_release_event() signal is emitted when a key is released.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::KEY_RELEASE_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param key_event The Gdk::EventKey which triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventKey* > signal_key_release_event();


  /** Event triggered by pointer entering widget area.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%enter_notify_event(GdkEventCrossing* crossing_event)</tt>
   *
   * The signal_enter_notify_event() will be emitted when the pointer enters
   * the @a widget's window.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::ENTER_NOTIFY_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param crossing_event The Gdk::EventCrossing which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventCrossing* > signal_enter_notify_event();


  /** Event triggered by pointer leaving widget area.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%leave_notify_event(GdkEventCrossing* crossing_event)</tt>
   *
   * The signal_leave_notify_event() will be emitted when the pointer leaves
   * the @a widget's window.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::LEAVE_NOTIFY_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param crossing_event The Gdk::EventCrossing which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventCrossing* > signal_leave_notify_event();


  /** Event triggered by a window resizing.
   *
   * @par Slot Prototype:
   * <tt>bool on_my_%configure_event(GdkEventConfigure* configure_event)</tt>
   *
   * The signal_configure_event() signal will be emitted when the size, position or
   * stacking of the @a widget's window has changed.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::STRUCTURE_MASK mask. GDK will enable this mask
   * automatically for all new windows.
   * 
   * @param configure_event The Gdk::EventConfigure which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventConfigure* > signal_configure_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%focus_in_event(GdkEventFocus* focus_event)</tt>
   *
   * The signal_focus_in_event() signal will be emitted when the keyboard focus
   * enters the @a widget's window.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::FOCUS_CHANGE_MASK mask.
   * 
   * @param focus_event The Gdk::EventFocus which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventFocus* > signal_focus_in_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%focus_out_event(GdkEventFocus* gdk_event)</tt>
   *
   * The signal_focus_out_event() signal will be emitted when the keyboard focus
   * leaves the @a widget's window.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::FOCUS_CHANGE_MASK mask.
   * 
   * @param gdk_event The Gdk::EventFocus which triggered this
   * signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventFocus* > signal_focus_out_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%map_event(GdkEventAny* any_event)</tt>
   *
   * The signal_map_event() signal will be emitted when the @a widget's window is
   * mapped. A window is mapped when it becomes visible on the screen.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::STRUCTURE_MASK mask. GDK will enable this mask
   * automatically for all new windows.
   * 
   * @param any_event The Gdk::EventAny which triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventAny* > signal_map_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%unmap_event(GdkEventAny* any_event)</tt>
   *
   * The signal_unmap_event() signal will be emitted when the @a widget's window is
   * unmapped. A window is unmapped when it becomes invisible on the screen.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::STRUCTURE_MASK mask. GDK will enable this mask
   * automatically for all new windows.
   * 
   * @param any_event The Gdk::EventAny which triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventAny* > signal_unmap_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%property_notify_event(GdkEventProperty* property_event)</tt>
   *
   * The signal_property_notify_event() signal will be emitted when a property on
   * the @a widget's window has been changed or deleted.
   * 
   * To receive this signal, the Gdk::Window associated to the widget needs
   * to enable the Gdk::PROPERTY_CHANGE_MASK mask.
   * 
   * @param property_event The Gdk::EventProperty which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventProperty* > signal_property_notify_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%selection_clear_event(GdkEventSelection* selection_event)</tt>
   *
   * The signal_selection_clear_event() signal will be emitted when the
   * the @a widget's window has lost ownership of a selection.
   * 
   * @param selection_event The Gdk::EventSelection which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventSelection* > signal_selection_clear_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%selection_request_event(GdkEventSelection* selection_event)</tt>
   *
   * The signal_selection_request_event() signal will be emitted when
   * another client requests ownership of the selection owned by
   * the @a widget's window.
   * 
   * @param selection_event The Gdk::EventSelection which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventSelection* > signal_selection_request_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%selection_notify_event(GdkEventSelection* selection_event)</tt>
   *
   * @return <tt>true</tt> to stop other handlers from being invoked for the event. <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventSelection* > signal_selection_notify_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%proximity_in_event(GdkEventProximity* proximity_event)</tt>
   *
   * To receive this signal the Gdk::Window associated to the widget needs
   * to enable the Gdk::PROXIMITY_IN_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param proximity_event The Gdk::EventProximity which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventProximity* > signal_proximity_in_event();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%proximity_out_event(GdkEventProximity* proximity_event)</tt>
   *
   * To receive this signal the Gdk::Window associated to the widget needs
   * to enable the Gdk::PROXIMITY_OUT_MASK mask.
   * 
   * This signal will be sent to the grab widget if there is one.
   * 
   * @param proximity_event The Gdk::EventProximity which triggered
   * this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventProximity* > signal_proximity_out_event();

  
#ifndef GTKMM_DISABLE_DEPRECATED

  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%visibility_notify_event(GdkEventVisibility* visibility_event)</tt>
   *
   * The signal_visibility_notify_event() will be emitted when the @a widget's
   * window is obscured or unobscured.
   * 
   * To receive this signal the Gdk::Window associated to the widget needs
   * to enable the Gdk::VISIBILITY_NOTIFY_MASK mask.
   * 
   * Deprecated: 3.12: Modern composited windowing systems with pervasive
   * transparency make it impossible to track the visibility of a window
   * reliably, so this signal can not be guaranteed to provide useful
   * information.
   * 
   * @deprecated Modern composited windowing systems with pervasive transparency make it impossible to track the visibility of a window reliably, so this signal can not be guaranteed to provide useful information.
   * 
   * @param visibility_event The Gdk::EventVisibility which
   * triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventVisibility* > signal_visibility_notify_event();
#endif // GTKMM_DISABLE_DEPRECATED


  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%window_state_event(GdkEventWindowState* window_state_event)</tt>
   *
   * The signal_window_state_event() will be emitted when the state of the
   * toplevel window associated to the @a widget changes.
   * 
   * To receive this signal the Gdk::Window associated to the widget
   * needs to enable the Gdk::STRUCTURE_MASK mask. GDK will enable
   * this mask automatically for all new windows.
   * 
   * @param window_state_event The Gdk::EventWindowState which
   * triggered this signal.
   * @return <tt>true</tt> to stop other handlers from being invoked for the
   * event. <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventWindowState* > signal_window_state_event();


  //We use the optional custom_c_callback parameter with _WRAP_SIGNAL() for some of these,
  //so that we can write special code to wrap the non-const SelectionData& output parameters:
  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%selection_get(SelectionData& selection_data, guint info, guint time)</tt>
   *
   * 
   */

  Glib::SignalProxy< void,SelectionData&,guint,guint > signal_selection_get();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%selection_received(const SelectionData& selection_data, guint time)</tt>
   *
   * 
   */

  Glib::SignalProxy< void,const SelectionData&,guint > signal_selection_received();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%drag_begin(const Glib::RefPtr<Gdk::DragContext>& context)</tt>
   *
   * The signal_drag_begin() signal is emitted on the drag source when a drag is
   * started. A typical reason to connect to this signal is to set up a
   * custom drag icon with e.g. gtk_drag_source_set_icon_pixbuf().
   * 
   * Note that some widgets set up a drag icon in the default handler of
   * this signal, so you may have to use Glib::signal_connect_after() to
   * override what the default handler did.
   * 
   * @param context The drag context.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::DragContext>& > signal_drag_begin();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%drag_end(const Glib::RefPtr<Gdk::DragContext>& context)</tt>
   *
   * The signal_drag_end() signal is emitted on the drag source when a drag is
   * finished.  A typical reason to connect to this signal is to undo
   * things done in Gtk::Widget::signal_drag_begin().
   * 
   * @param context The drag context.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::DragContext>& > signal_drag_end();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%drag_data_get(const Glib::RefPtr<Gdk::DragContext>& context, SelectionData& selection_data, guint info, guint time)</tt>
   *
   * The signal_drag_data_get() signal is emitted on the drag source when the drop
   * site requests the data which is dragged. It is the responsibility of
   * the signal handler to fill @a selection_data with the data in the format which
   * is indicated by @a info. See Gtk::SelectionData::set() and
   * Gtk::SelectionData::set_text().
   * 
   * @param context The drag context.
   * @param selection_data The Gtk::SelectionData to be filled with the dragged data.
   * @param info The info that has been registered with the target in the
   * Gtk::TargetList.
   * @param time The timestamp at which the data was requested.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::DragContext>&,SelectionData&,guint,guint > signal_drag_data_get();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%drag_data_delete(const Glib::RefPtr<Gdk::DragContext>& context)</tt>
   *
   * The signal_drag_data_delete() signal is emitted on the drag source when a drag
   * with the action Gdk::ACTION_MOVE is successfully completed. The signal
   * handler is responsible for deleting the data that has been dropped. What
   * "delete" means depends on the context of the drag operation.
   * 
   * @param context The drag context.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::DragContext>& > signal_drag_data_delete();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%drag_failed(const Glib::RefPtr<Gdk::DragContext>& context, DragResult result)</tt>
   *
   * The signal_drag_failed() signal is emitted on the drag source when a drag has
   * failed. The signal handler may hook custom code to handle a failed DnD
   * operation based on the type of error, it returns <tt>true</tt> is the failure has
   * been already handled (not showing the default "drag operation failed"
   * animation), otherwise it returns <tt>false</tt>.
   * 
   * @newin{2,12}
   * 
   * @param context The drag context.
   * @param result The result of the drag operation.
   * @return <tt>true</tt> if the failed drag operation has been already handled.
   */

  Glib::SignalProxy< bool,const Glib::RefPtr<Gdk::DragContext>&,DragResult > signal_drag_failed();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%drag_leave(const Glib::RefPtr<Gdk::DragContext>& context, guint time)</tt>
   *
   * The signal_drag_leave() signal is emitted on the drop site when the cursor
   * leaves the widget. A typical reason to connect to this signal is to
   * undo things done in Gtk::Widget::signal_drag_motion(), e.g. undo highlighting
   * with gtk_drag_unhighlight().
   * 
   * 
   * Likewise, the Gtk::Widget::signal_drag_leave() signal is also emitted before the 
   * signal_drag_drop() signal, for instance to allow cleaning up of a preview item  
   * created in the Gtk::Widget::signal_drag_motion() signal handler.
   * 
   * @param context The drag context.
   * @param time The timestamp of the motion event.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::DragContext>&,guint > signal_drag_leave();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%drag_motion(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time)</tt>
   *
   * The signal_drag_motion() signal is emitted on the drop site when the user
   * moves the cursor over the widget during a drag. The signal handler
   * must determine whether the cursor position is in a drop zone or not.
   * If it is not in a drop zone, it returns <tt>false</tt> and no further processing
   * is necessary. Otherwise, the handler returns <tt>true</tt>. In this case, the
   * handler is responsible for providing the necessary information for
   * displaying feedback to the user, by calling gdk_drag_status().
   * 
   * If the decision whether the drop will be accepted or rejected can't be
   * made based solely on the cursor position and the type of the data, the
   * handler may inspect the dragged data by calling gtk_drag_get_data() and
   * defer the gdk_drag_status() call to the Gtk::Widget::signal_drag_data_received()
   * handler. Note that you must pass Gtk::DEST_DEFAULT_DROP,
   * Gtk::DEST_DEFAULT_MOTION or Gtk::DEST_DEFAULT_ALL to gtk_drag_dest_set()
   * when using the drag-motion signal that way.
   * 
   * Also note that there is no drag-enter signal. The drag receiver has to
   * keep track of whether he has received any drag-motion signals since the
   * last Gtk::Widget::signal_drag_leave() and if not, treat the drag-motion signal as
   * an "enter" signal. Upon an "enter", the handler will typically highlight
   * the drop site with gtk_drag_highlight().
   * 
   * [C example ellipted]
   * 
   * @param context The drag context.
   * @param x The x coordinate of the current cursor position.
   * @param y The y coordinate of the current cursor position.
   * @param time The timestamp of the motion event.
   * @return Whether the cursor position is in a drop zone.
   */

  Glib::SignalProxy< bool,const Glib::RefPtr<Gdk::DragContext>&,int,int,guint > signal_drag_motion();

  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%drag_drop(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, guint time)</tt>
   *
   * The signal_drag_drop() signal is emitted on the drop site when the user drops
   * the data onto the widget. The signal handler must determine whether
   * the cursor position is in a drop zone or not. If it is not in a drop
   * zone, it returns <tt>false</tt> and no further processing is necessary.
   * Otherwise, the handler returns <tt>true</tt>. In this case, the handler must
   * ensure that gtk_drag_finish() is called to let the source know that
   * the drop is done. The call to gtk_drag_finish() can be done either
   * directly or in a Gtk::Widget::signal_drag_data_received() handler which gets
   * triggered by calling gtk_drag_get_data() to receive the data for one
   * or more of the supported targets.
   * 
   * @param context The drag context.
   * @param x The x coordinate of the current cursor position.
   * @param y The y coordinate of the current cursor position.
   * @param time The timestamp of the motion event.
   * @return Whether the cursor position is in a drop zone.
   */

  Glib::SignalProxy< bool,const Glib::RefPtr<Gdk::DragContext>&,int,int,guint > signal_drag_drop();

  
  /**
   * @par Slot Prototype:
   * <tt>void on_my_%drag_data_received(const Glib::RefPtr<Gdk::DragContext>& context, int x, int y, const SelectionData& selection_data, guint info, guint time)</tt>
   *
   * The signal_drag_data_received() signal is emitted on the drop site when the
   * dragged data has been received. If the data was received in order to
   * determine whether the drop will be accepted, the handler is expected
   * to call gdk_drag_status() and not finish the drag.
   * If the data was received in response to a Gtk::Widget::signal_drag_drop() signal
   * (and this is the last target to be received), the handler for this
   * signal is expected to process the received data and then call
   * gtk_drag_finish(), setting the @a success parameter depending on
   * whether the data was processed successfully.
   * 
   * Applications must create some means to determine why the signal was emitted 
   * and therefore whether to call gdk_drag_status() or gtk_drag_finish(). 
   * 
   * The handler may inspect the selected action with
   * gdk_drag_context_get_selected_action() before calling
   * gtk_drag_finish(), e.g. to implement Gdk::ACTION_ASK as
   * shown in the following example:
   * 
   * [C example ellipted]
   * 
   * @param context The drag context.
   * @param x Where the drop happened.
   * @param y Where the drop happened.
   * @param selection_data The received data.
   * @param info The info that has been registered with the target in the
   * Gtk::TargetList.
   * @param time The timestamp at which the data was received.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::DragContext>&,int,int,const SelectionData&,guint,guint > signal_drag_data_received();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%screen_changed(const Glib::RefPtr<Gdk::Screen>& previous_screen)</tt>
   *
   * The signal_screen_changed() signal gets emitted when the
   * screen of a widget has changed.
   * 
   * @param previous_screen The previous screen, or <tt>nullptr</tt> if the
   * widget was not associated with a screen before.
   */

  Glib::SignalProxy< void,const Glib::RefPtr<Gdk::Screen>& > signal_screen_changed();


  /**
   * @par Slot Prototype:
   * <tt>void on_my_%composited_changed()</tt>
   *
   * The signal_composited_changed() signal is emitted when the composited
   * status of @a widgets screen changes.
   * See gdk_screen_is_composited().
   */

  Glib::SignalProxy< void > signal_composited_changed();


//TODO: The signal_id is very C-like here:
  //_WRAP_SIGNAL(bool can_activate_accel(guint signal_id), "can_activate_accel")

   // TODO: Remove no_default_handler when we can break ABI:
  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%popup_menu()</tt>
   *
   * This signal gets emitted whenever a widget should pop up a context
   * menu. This usually happens through the standard key binding mechanism;
   * by pressing a certain key while a widget is focused, the user can cause
   * the widget to pop up a menu.  For example, the Gtk::Entry widget creates
   * a menu with clipboard commands. See the
   * [Popup Menu Migration Checklist][checklist-popup-menu]
   * for an example of how to use this signal.
   * 
   * @return <tt>true</tt> if a menu was activated.
   */

  Glib::SignalProxy< bool > signal_popup_menu();
 //Note that popup-menu is a keybinding signal, but is really meant to be wrapped.

  //Keybinding signals:
  
  
   // TODO: Remove no_default_handler when we can break ABI:
 

  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%query_tooltip(int x, int y, bool keyboard_tooltip, const Glib::RefPtr<Tooltip>& tooltip)</tt>
   *
   * Emitted when Gtk::Widget::property_has_tooltip() is <tt>true</tt> and the hover timeout
   * has expired with the cursor hovering "above" @a widget; or emitted when @a widget got
   * focus in keyboard mode.
   * 
   * Using the given coordinates, the signal handler should determine
   * whether a tooltip should be shown for @a widget. If this is the case
   * <tt>true</tt> should be returned, <tt>false</tt> otherwise.  Note that if
   *  @a keyboard_tooltip is <tt>true</tt>, the values of @a x and @a y are undefined and
   * should not be used.
   * 
   * The signal handler is free to manipulate @a tooltip with the therefore
   * destined function calls.
   * 
   * @newin{2,12}
   * 
   * @param x The x coordinate of the cursor position where the request has
   * been emitted, relative to @a widget's left side.
   * @param y The y coordinate of the cursor position where the request has
   * been emitted, relative to @a widget's top.
   * @param keyboard_tooltip <tt>true</tt> if the tooltip was triggered using the keyboard.
   * @param tooltip A Gtk::Tooltip.
   * @return <tt>true</tt> if @a tooltip should be shown right now, <tt>false</tt> otherwise.
   */

  Glib::SignalProxy< bool,int,int,bool,const Glib::RefPtr<Tooltip>& > signal_query_tooltip();


  //(This was added to GTK+ 2.8 but forgotten by us until gtkmm 2.13/14):
  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%grab_broken_event(GdkEventGrabBroken* grab_broken_event)</tt>
   *
   * Emitted when a pointer or keyboard grab on a window belonging
   * to @a widget gets broken.
   * 
   * On X11, this happens when the grab window becomes unviewable
   * (i.e. it or one of its ancestors is unmapped), or if the same
   * application grabs the pointer or keyboard again.
   * 
   * @newin{2,8}
   * 
   * @param grab_broken_event The Gdk::EventGrabBroken event.
   * @return <tt>true</tt> to stop other handlers from being invoked for
   * the event. <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventGrabBroken* > signal_grab_broken_event();


  // TODO: Remove no_default_handler when we can break ABI:
  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%damage_event(GdkEventExpose* expose_event)</tt>
   *
   * Emitted when a redirected window belonging to @a widget gets drawn into.
   * The region/area members of the event shows what area of the redirected
   * drawable was drawn into.
   * 
   * @newin{2,14}
   * 
   * @param expose_event The Gdk::EventExpose event.
   * @return <tt>true</tt> to stop other handlers from being invoked for the event.
   * <tt>false</tt> to propagate the event further.
   */

  Glib::SignalProxy< bool,GdkEventExpose* > signal_damage_event();


  // TODO: Remove no_default_handler when we can break ABI:
  
  /**
   * @par Slot Prototype:
   * <tt>bool on_my_%touch_event(GdkEventTouch* touch_event)</tt>
   *
   */

  Glib::SignalProxy< bool,GdkEventTouch* > signal_touch_event();


  /** The name of the widget.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Glib::ustring > property_name() ;

/** The name of the widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Glib::ustring > property_name() const;

  /** The parent widget of this widget. Must be a Container widget.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Container* > property_parent() ;

/** The parent widget of this widget. Must be a Container widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Container* > property_parent() const;

  /** Override for width request of the widget, or -1 if natural request should be used.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_width_request() ;

/** Override for width request of the widget, or -1 if natural request should be used.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_width_request() const;

  /** Override for height request of the widget, or -1 if natural request should be used.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_height_request() ;

/** Override for height request of the widget, or -1 if natural request should be used.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_height_request() const;

  /** Whether the widget is visible.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_visible() ;

/** Whether the widget is visible.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_visible() const;

  /** Whether the widget responds to input.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_sensitive() ;

/** Whether the widget responds to input.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_sensitive() const;

  /** Whether the application will paint directly on the widget.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_app_paintable() ;

/** Whether the application will paint directly on the widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_app_paintable() const;

  /** Whether the widget can accept the input focus.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_can_focus() ;

/** Whether the widget can accept the input focus.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_can_focus() const;

  /** Whether the widget has the input focus.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_has_focus() ;

/** Whether the widget has the input focus.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_has_focus() const;

  /** Whether the widget is the focus widget within the toplevel.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_is_focus() ;

/** Whether the widget is the focus widget within the toplevel.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_is_focus() const;

  /** Whether the widget should grab focus when it is clicked with the mouse.
   * 
   * This property is only relevant for widgets that can take focus.
   * 
   * Before 3.20, several widgets (GtkButton, GtkFileChooserButton,
   * GtkComboBox) implemented this property individually.
   * 
   * @newin{3,20}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_focus_on_click() ;

/** Whether the widget should grab focus when it is clicked with the mouse.
   * 
   * This property is only relevant for widgets that can take focus.
   * 
   * Before 3.20, several widgets (GtkButton, GtkFileChooserButton,
   * GtkComboBox) implemented this property individually.
   * 
   * @newin{3,20}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_focus_on_click() const;

  /** Whether the widget can be the default widget.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_can_default() ;

/** Whether the widget can be the default widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_can_default() const;

  /** Whether the widget is the default widget.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_has_default() ;

/** Whether the widget is the default widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_has_default() const;

  /** If TRUE, the widget will receive the default action when it is focused.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_receives_default() ;

/** If TRUE, the widget will receive the default action when it is focused.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_receives_default() const;

  /** Whether the widget is part of a composite widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_composite_child() const;


#ifndef GTKMM_DISABLE_DEPRECATED

/** The style of the widget, which contains information about how it will look (colors, etc).
   * 
   * Deprecated: Use Gtk::StyleContext instead
   * 
   * @deprecated Don't use this API. There is no Style class in gtkmm 3.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Glib::RefPtr<Style> > property_style() ;

/** The style of the widget, which contains information about how it will look (colors, etc).
   * 
   * Deprecated: Use Gtk::StyleContext instead
   * 
   * @deprecated Don't use this API. There is no Style class in gtkmm 3.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Style> > property_style() const;

#endif // GTKMM_DISABLE_DEPRECATED

  /** The event mask that decides what kind of GdkEvents this widget gets.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Gdk::EventMask > property_events() ;

/** The event mask that decides what kind of GdkEvents this widget gets.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Gdk::EventMask > property_events() const;

  /** Enables or disables the emission of Gtk::Widget::signal_query_tooltip() on @a widget.
   * A value of <tt>true</tt> indicates that @a widget can have a tooltip, in this case
   * the widget will be queried using Gtk::Widget::signal_query_tooltip() to determine
   * whether it will provide a tooltip or not.
   * 
   * Note that setting this property to <tt>true</tt> for the first time will change
   * the event masks of the GdkWindows of this widget to include leave-notify
   * and motion-notify events.  This cannot and will not be undone when the
   * property is set to <tt>false</tt> again.
   * 
   * @newin{2,12}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_has_tooltip() ;

/** Enables or disables the emission of Gtk::Widget::signal_query_tooltip() on @a widget.
   * A value of <tt>true</tt> indicates that @a widget can have a tooltip, in this case
   * the widget will be queried using Gtk::Widget::signal_query_tooltip() to determine
   * whether it will provide a tooltip or not.
   * 
   * Note that setting this property to <tt>true</tt> for the first time will change
   * the event masks of the GdkWindows of this widget to include leave-notify
   * and motion-notify events.  This cannot and will not be undone when the
   * property is set to <tt>false</tt> again.
   * 
   * @newin{2,12}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_has_tooltip() const;

  /** Sets the text of tooltip to be the given string, which is marked up
   * with the [Pango text markup language][PangoMarkupFormat].
   * Also see Gtk::Tooltip::set_markup().
   * 
   * This is a convenience property which will take care of getting the
   * tooltip shown if the given string is not <tt>nullptr</tt>: Gtk::Widget::property_has_tooltip()
   * will automatically be set to <tt>true</tt> and there will be taken care of
   * Gtk::Widget::signal_query_tooltip() in the default signal handler.
   * 
   * Note that if both Gtk::Widget::property_tooltip_text() and Gtk::Widget::property_tooltip_markup()
   * are set, the last one wins.
   * 
   * @newin{2,12}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Glib::ustring > property_tooltip_markup() ;

/** Sets the text of tooltip to be the given string, which is marked up
   * with the [Pango text markup language][PangoMarkupFormat].
   * Also see Gtk::Tooltip::set_markup().
   * 
   * This is a convenience property which will take care of getting the
   * tooltip shown if the given string is not <tt>nullptr</tt>: Gtk::Widget::property_has_tooltip()
   * will automatically be set to <tt>true</tt> and there will be taken care of
   * Gtk::Widget::signal_query_tooltip() in the default signal handler.
   * 
   * Note that if both Gtk::Widget::property_tooltip_text() and Gtk::Widget::property_tooltip_markup()
   * are set, the last one wins.
   * 
   * @newin{2,12}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Glib::ustring > property_tooltip_markup() const;

  /** Sets the text of tooltip to be the given string.
   * 
   * Also see Gtk::Tooltip::set_text().
   * 
   * This is a convenience property which will take care of getting the
   * tooltip shown if the given string is not <tt>nullptr</tt>: Gtk::Widget::property_has_tooltip()
   * will automatically be set to <tt>true</tt> and there will be taken care of
   * Gtk::Widget::signal_query_tooltip() in the default signal handler.
   * 
   * Note that if both Gtk::Widget::property_tooltip_text() and Gtk::Widget::property_tooltip_markup()
   * are set, the last one wins.
   * 
   * @newin{2,12}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Glib::ustring > property_tooltip_text() ;

/** Sets the text of tooltip to be the given string.
   * 
   * Also see Gtk::Tooltip::set_text().
   * 
   * This is a convenience property which will take care of getting the
   * tooltip shown if the given string is not <tt>nullptr</tt>: Gtk::Widget::property_has_tooltip()
   * will automatically be set to <tt>true</tt> and there will be taken care of
   * Gtk::Widget::signal_query_tooltip() in the default signal handler.
   * 
   * Note that if both Gtk::Widget::property_tooltip_text() and Gtk::Widget::property_tooltip_markup()
   * are set, the last one wins.
   * 
   * @newin{2,12}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Glib::ustring > property_tooltip_text() const;

  /** The widget's window if it is realized, <tt>nullptr</tt> otherwise.
   * 
   * @newin{2,14}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Glib::RefPtr<Gdk::Window> > property_window() const;


  /** Whether gtk_widget_show_all() should not affect this widget.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_no_show_all() ;

/** Whether gtk_widget_show_all() should not affect this widget.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_no_show_all() const;

  
#ifndef GTKMM_DISABLE_DEPRECATED

/** Whether the widget is double buffered.
   * 
   * @newin{2,18}
   * 
   * Deprecated: 3.14: Widgets should not use this property.
   * 
   * @deprecated Widgets should not use this property.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_double_buffered() ;

/** Whether the widget is double buffered.
   * 
   * @newin{2,18}
   * 
   * Deprecated: 3.14: Widgets should not use this property.
   * 
   * @deprecated Widgets should not use this property.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_double_buffered() const;

#endif // GTKMM_DISABLE_DEPRECATED


  /** How to distribute horizontal space if widget gets extra space, see Gtk::Align
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Align > property_halign() ;

/** How to distribute horizontal space if widget gets extra space, see Gtk::Align
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Align > property_halign() const;

  /** How to distribute vertical space if widget gets extra space, see Gtk::Align
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Align > property_valign() ;

/** How to distribute vertical space if widget gets extra space, see Gtk::Align
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Align > property_valign() const;

  
#ifndef GTKMM_DISABLE_DEPRECATED

/** Margin on left side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * Deprecated: 3.12: Use Gtk::Widget::property_margin_start() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use property_margin_start() instead.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin_left() ;

/** Margin on left side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * Deprecated: 3.12: Use Gtk::Widget::property_margin_start() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use property_margin_start() instead.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin_left() const;

#endif // GTKMM_DISABLE_DEPRECATED

  
#ifndef GTKMM_DISABLE_DEPRECATED

/** Margin on right side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * Deprecated: 3.12: Use Gtk::Widget::property_margin_end() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use property_margin_end() instead.
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin_right() ;

/** Margin on right side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * Deprecated: 3.12: Use Gtk::Widget::property_margin_end() instead.
   * 
   * @newin{3,0}
   * 
   * @deprecated Use property_margin_end() instead.
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin_right() const;

#endif // GTKMM_DISABLE_DEPRECATED

  /** Margin on start of widget, horizontally. This property supports
   * left-to-right and right-to-left text directions.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,12}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin_start() ;

/** Margin on start of widget, horizontally. This property supports
   * left-to-right and right-to-left text directions.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,12}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin_start() const;

  /** Margin on end of widget, horizontally. This property supports
   * left-to-right and right-to-left text directions.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,12}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin_end() ;

/** Margin on end of widget, horizontally. This property supports
   * left-to-right and right-to-left text directions.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,12}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin_end() const;

  /** Margin on top side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin_top() ;

/** Margin on top side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin_top() const;

  /** Margin on bottom side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin_bottom() ;

/** Margin on bottom side of widget.
   * 
   * This property adds margin outside of the widget's normal size
   * request, the margin will be added in addition to the size from
   * Gtk::Widget::set_size_request() for example.
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin_bottom() const;

  /** Sets all four sides' margin at once. If read, returns max
   * margin on any side.
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< int > property_margin() ;

/** Sets all four sides' margin at once. If read, returns max
   * margin on any side.
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_margin() const;

  /** Whether to expand horizontally. See Gtk::Widget::set_hexpand().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_hexpand() ;

/** Whether to expand horizontally. See Gtk::Widget::set_hexpand().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_hexpand() const;

  /** Whether to use the Gtk::Widget::property_hexpand() property. See Gtk::Widget::get_hexpand_set().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_hexpand_set() ;

/** Whether to use the Gtk::Widget::property_hexpand() property. See Gtk::Widget::get_hexpand_set().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_hexpand_set() const;

  /** Whether to expand vertically. See Gtk::Widget::set_vexpand().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_vexpand() ;

/** Whether to expand vertically. See Gtk::Widget::set_vexpand().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_vexpand() const;

  /** Whether to use the Gtk::Widget::property_vexpand() property. See Gtk::Widget::get_vexpand_set().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_vexpand_set() ;

/** Whether to use the Gtk::Widget::property_vexpand() property. See Gtk::Widget::get_vexpand_set().
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_vexpand_set() const;

  /** Whether to expand in both directions. Setting this sets both Gtk::Widget::property_hexpand() and Gtk::Widget::property_vexpand()
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< bool > property_expand() ;

/** Whether to expand in both directions. Setting this sets both Gtk::Widget::property_hexpand() and Gtk::Widget::property_vexpand()
   * 
   * @newin{3,0}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< bool > property_expand() const;

  /** The requested opacity of the widget. See Gtk::Widget::set_opacity() for
   * more details about window opacity.
   * 
   * Before 3.8 this was only available in GtkWindow
   * 
   * @newin{3,8}
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< double > property_opacity() ;

/** The requested opacity of the widget. See Gtk::Widget::set_opacity() for
   * more details about window opacity.
   * 
   * Before 3.8 this was only available in GtkWindow
   * 
   * @newin{3,8}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< double > property_opacity() const;

  /** The scale factor of the widget. See Gtk::Widget::get_scale_factor() for
   * more details about widget scaling.
   * 
   * @newin{3,10}
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< int > property_scale_factor() const;


protected:

  //comment in GTK+ header: "seldomly overidden"
    virtual void dispatch_child_properties_changed_vfunc(guint p1, GParamSpec** p2);


    virtual void show_all_vfunc();

  
#ifdef  GTKMM_ATKMM_ENABLED
  virtual Glib::RefPtr<Atk::Object> get_accessible_vfunc();

#endif //  GTKMM_ATKMM_ENABLED


    virtual SizeRequestMode get_request_mode_vfunc() const;

    virtual void get_preferred_width_vfunc(int& minimum_width, int& natural_width) const;

    virtual void get_preferred_height_for_width_vfunc(int width, int& minimum_height, int& natural_height) const;

    virtual void get_preferred_height_vfunc(int& minimum_height, int& natural_height) const;

    virtual void get_preferred_width_for_height_vfunc(int height, int& minimum_width, int& natural_width) const;

  //TODO: Wrap all the new vfuncs when we can break ABI.

protected:
  Widget();

  
  /** Creates the GDK (windowing system) resources associated with a
   * widget.  For example, @a widget->window will be created when a widget
   * is realized.  Normally realization happens implicitly; if you show
   * a widget and all its parent containers, then the widget will be
   * realized and mapped automatically.
   * 
   * Realizing a widget requires all
   * the widget’s parent widgets to be realized; calling
   * realize() realizes the widget’s parents in addition to
   *  @a widget itself. If a widget is not yet inside a toplevel window
   * when you realize it, bad things will happen.
   * 
   * This function is primarily used in widget implementations, and
   * isn’t very useful otherwise. Many times when you think you might
   * need it, a better approach is to connect to a signal that will be
   * called after the widget is realized automatically, such as
   * Gtk::Widget::signal_draw(). Or simply Glib::signal_connect() to the
   * Gtk::Widget::signal_realize() signal.
   */
  void realize();
  
  /** This function is only useful in widget implementations.
   * Causes a widget to be unrealized (frees all GDK resources
   * associated with the widget, such as @a widget->window).
   */
  void unrealize();

 
  /** Draws @a widget to @a cr. The top left corner of the widget will be
   * drawn to the currently set origin point of @a cr.
   * 
   * You should pass a cairo context as @a cr argument that is in an
   * original state. Otherwise the resulting drawing is undefined. For
   * example changing the operator using cairo_set_operator() or the
   * line width using cairo_set_line_width() might have unwanted side
   * effects.
   * You may however change the context’s transform matrix - like with
   * cairo_scale(), cairo_translate() or cairo_set_matrix() and clip
   * region with cairo_clip() prior to calling this function. Also, it
   * is fine to modify the context with cairo_save() and
   * cairo_push_group() prior to calling this function.
   * 
   * Note that special-purpose widgets may contain special code for
   * rendering to the screen and might appear differently on screen
   * and when rendered using draw().
   * 
   * @newin{3,0}
   * 
   * @param cr A cairo context to draw to.
   */
  void draw(const ::Cairo::RefPtr< ::Cairo::Context>& cr);

  
  /** Marks the widget as being realized.
   * 
   * This function should only ever be called in a derived widget's
   * “map” or “unmap” implementation.
   * 
   * @newin{2,20}
   * 
   * @param mapped <tt>true</tt> to mark the widget as mapped.
   */
  void set_mapped(bool mapped =  true);
  
  /** Marks the widget as being realized. This function must only be 
   * called after all Gdk::Windows for the @a widget have been created 
   * and registered.
   * 
   * This function should only ever be called in a derived widget's
   * “realize” or “unrealize” implementation.
   * 
   * @newin{2,20}
   * 
   * @param realized <tt>true</tt> to mark the widget as realized.
   */
  void set_realized(bool realized =  true);

  
  /** Specifies whether @a widget has a Gdk::Window of its own. Note that
   * all realized widgets have a non-<tt>nullptr</tt> “window” pointer
   * (get_window() never returns a <tt>nullptr</tt> window when a widget
   * is realized), but for many of them it’s actually the Gdk::Window of
   * one of its parent widgets. Widgets that do not create a %window for
   * themselves in Gtk::Widget::signal_realize() must announce this by
   * calling this function with @a has_window = <tt>false</tt>.
   * 
   * This function should only be called by widget implementations,
   * and they should call it in their init() function.
   * 
   * @newin{2,18}
   * 
   * @param has_window Whether or not @a widget has a window.
   */
  void set_has_window(bool has_window =  true);

  /** Sets a widget's window. This function should only be used in a
   * widget's Gtk::Widget::on_realize() implementation. The %window passed is
   * usually either a new window created with Gdk::Window::create(), or the
   * window of its parent widget as returned by get_parent_window().
   *
   * Widgets must indicate whether they will create their own Gdk::Window
   * by calling set_has_window(). This is usually done in the
   * widget's constructor.
   *
   * This function should only be called by custom widget implementations,
   * and they should call it in their on_realize() function.
   *
   * @newin{2,18}
   *
   * @param window A Gdk::Window.
   */
  void set_window(const Glib::RefPtr<Gdk::Window>& window);
  

  /** This function is supposed to be called in Gtk::Widget::signal_draw()
   * implementations for widgets that support multiple windows.
   *  @a cr must be untransformed from invoking of the draw function.
   * This function will return <tt>true</tt> if the contents of the given
   *  @a window are supposed to be drawn and <tt>false</tt> otherwise. Note
   * that when the drawing was not initiated by the windowing
   * system this function will return <tt>true</tt> for all windows, so
   * you need to draw the bottommost window first. Also, do not
   * use “else if” statements to check which window should be drawn.
   * 
   * @newin{3,0}
   * 
   * @param cr A cairo context.
   * @param window The window to check. @a window may not be an input-only
   * window.
   * @return <tt>true</tt> if @a window should be drawn.
   */
  static bool should_draw_window(const ::Cairo::RefPtr<const ::Cairo::Context>& cr, const Glib::RefPtr<const Gdk::Window>& window);

 /** Transforms the given cairo context @a cr from widget-relative
  * coordinates to window-relative coordinates.
  * If the widget's window is not an ancestor of @a window, no
  * modification will be applied.
  *
  * This is the inverse to the transformation GTK applies when
  * preparing an expose event to be emitted with the Widget's draw
  * signal. It is intended to help porting multiwindow widgets from
  * GTK+ 2 to the rendering architecture of GTK+ 3.
  *
  * @param cr The cairo context to transform.
  * @param window The window to transform the context to.
  *
  * @newin{3,0}
  */
  void transform_cairo_context_to_window(const ::Cairo::RefPtr< ::Cairo::Context>& cr, const Glib::RefPtr<const Gdk::Window>& window);
  

#ifndef GTKMM_DISABLE_DEPRECATED
  /**  Retrieves the widget's requisition.
   *
   * This method should only be used by widget implementations in
   * order to discover whether the widget's requisition has actually
   * changed after some internal state change (so that they can call
   * queue_resize() instead of queue_draw()).
   *
   * Normally, size_request() should be used.
   *
   * @result The widget's requisition.
   *
   * @newin{2,20}
   * @deprecated Use get_preferred_size() instead.
   */
  Requisition get_requisition() const;
  
#endif // GTKMM_DISABLE_DEPRECATED

   //deprecated
   //deprecated.

  //The parameter name is "the_property_name" to avoid a warning because there is a method with the "property_name" name.
  
  /** Gets the value of a style property of @a widget.
   *
   * It is usually easier to use get_style_property(), to avoid the use of
   * Glib::Value.
   *
   * @param the_property_name The name of a style property.
   * @param value Location to return the property value.
   */
  void get_style_property_value(const Glib::ustring& the_property_name, Glib::ValueBase& value) const;

  void realize_if_needed();


};

#ifndef DOXYGEN_SHOULD_SKIP_THIS

//The parameter name is "the_property_name" to avoid a warning because there is a method with the "property_name" name.
template <class PropertyType>
void Widget::get_style_property(const Glib::ustring& the_property_name, PropertyType& value) const
{
  Glib::Value<PropertyType> property_value;
  property_value.init(Glib::Value<PropertyType>::value_type());

  this->get_style_property_value(the_property_name, property_value);

  value = property_value.get();
}

#endif /* DOXYGEN_SHOULD_SKIP_THIS */

} // namespace Gtk


namespace Glib
{
  /** A Glib::wrap() method for this object.
   *
   * @param object The C instance.
   * @param take_copy False if the result should take ownership of the C instance. True if it should take a new copy or ref.
   * @result A C++ instance that wraps this C instance.
   *
   * @relates Gtk::Widget
   */
  Gtk::Widget* wrap(GtkWidget* object, bool take_copy = false);
} //namespace Glib


#endif /* _GTKMM_WIDGET_H */