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/*
    Copyright (c) 2006 - 2007 Volker Krause <vkrause@kde.org>
    Copyright (c) 2008 Stephen Kelly <steveire@gmail.com>
    Copyright (c) 2012 Laurent Montel <montel@kde.org>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#ifndef AKONADI_ENTITYTREEVIEW_H
#define AKONADI_ENTITYTREEVIEW_H

#include "akonadi_export.h"

#include <QTreeView>

class KXMLGUIClient;
class QDragMoveEvent;

namespace Akonadi
{

class Collection;
class Item;

/**
 * @short A view to show an item/collection tree provided by an EntityTreeModel.
 *
 * When a KXmlGuiWindow is passed to the constructor, the XMLGUI
 * defined context menu @c akonadi_collectionview_contextmenu or
 * @c akonadi_itemview_contextmenu is used if available.
 *
 * Example:
 *
 * @code
 *
 * using namespace Akonadi;
 *
 * class MyWindow : public KXmlGuiWindow
 * {
 *   public:
 *    MyWindow()
 *      : KXmlGuiWindow()
 *    {
 *      EntityTreeView *view = new EntityTreeView( this, this );
 *      setCentralWidget( view );
 *
 *      EntityTreeModel *model = new EntityTreeModel( ... );
 *      view->setModel( model );
 *    }
 * }
 *
 * @endcode
 *
 * @author Volker Krause <vkrause@kde.org>
 * @author Stephen Kelly <steveire@gmail.com>
 * @since 4.4
 */
class AKONADI_EXPORT EntityTreeView : public QTreeView
{
    Q_OBJECT

public:
    /**
     * Creates a new entity tree view.
     *
     * @param parent The parent widget.
     */
    explicit EntityTreeView(QWidget *parent = 0);

    /**
     * Creates a new entity tree view.
     *
     * @param xmlGuiClient The KXMLGUIClient the view is used in.
     *                     This is needed for the XMLGUI based context menu.
     *                     Passing 0 is ok and will disable the builtin context menu.
     * @param parent The parent widget.
     */
    explicit EntityTreeView(KXMLGUIClient *xmlGuiClient, QWidget *parent = 0);

    /**
     * Destroys the entity tree view.
     */
    virtual ~EntityTreeView();

    /**
     * Sets the XML GUI client which the view is used in.
     *
     * This is needed if you want to use the built-in context menu.
     *
     * @param xmlGuiClient The KXMLGUIClient the view is used in.
     */
    void setXmlGuiClient(KXMLGUIClient *xmlGuiClient);

    /**
     * Return the XML GUI client which the view is used in.
     * @since 4.12
     */
    KXMLGUIClient *xmlGuiClient() const;

    /**
     * @reimp
     * @param model the model to set
     */
    virtual void setModel(QAbstractItemModel *model);

    /**
     * Sets whether the drop action menu is @p enabled and will
     * be shown on drop operation.
     * @param enabled enables drop action menu if set as @c true
     * @since 4.5
     */
    void setDropActionMenuEnabled(bool enabled);

    /**
     * Returns whether the drop action menu is enabled and will
     * be shown on drop operation.
     *
     * @since 4.5
     */
    bool isDropActionMenuEnabled() const;

    /**
     * Return true if we use an manual sorting
     * Necessary to fix dnd menu
     * We must show just move when we move item between two items
     * When automatic no show dnd menu between two items.
     * @since 4.8.1
     */
    bool isManualSortingActive() const;

    /**
     * Set true if we automatic sorting
     * @param active enables automatic sorting if set as @c true
     * @since 4.8.1
     */
    void setManualSortingActive(bool active);

    /**
     * Set the name of the default popup menu (retrieved from the
     * application's XMLGUI file).
     *
     * This menu is used as a fallback if the context of the menu request
     * is neither an item nor a collection, e.g. the click is on an empty
     * area inside the view.  If the click is over an entry in the view,
     * the menu which is applicable to the clicked entry (either an Item
     * or a Collection) is used.
     *
     * @param name The name of the popup menu
     *
     * @since 4.9
     * @note For backwards compatibility, the default is the standard
     * collection popup menu, "akonadi_collectionview_contextmenu".
     * @see KXMLGUIClient, KXMLGUIFactory::container()
     */
    void setDefaultPopupMenu(const QString &name);

Q_SIGNALS:
    /**
     * This signal is emitted whenever the user has clicked
     * a collection in the view.
     *
     * @param collection The clicked collection.
     */
    void clicked(const Akonadi::Collection &collection);

    /**
     * This signal is emitted whenever the user has clicked
     * an item in the view.
     *
     * @param item The clicked item.
     */
    void clicked(const Akonadi::Item &item);

    /**
     * This signal is emitted whenever the user has double clicked
     * a collection in the view.
     *
     * @param collection The double clicked collection.
     */
    void doubleClicked(const Akonadi::Collection &collection);

    /**
     * This signal is emitted whenever the user has double clicked
     * an item in the view.
     *
     * @param item The double clicked item.
     */
    void doubleClicked(const Akonadi::Item &item);

    /**
     * This signal is emitted whenever the current collection
     * in the view has changed.
     *
     * @param collection The new current collection.
     */
    void currentChanged(const Akonadi::Collection &collection);

    /**
     * This signal is emitted whenever the current item
     * in the view has changed.
     *
     * @param item The new current item.
     */
    void currentChanged(const Akonadi::Item &item);

protected:
    using QTreeView::currentChanged;
#ifndef QT_NO_DRAGANDDROP
    virtual void startDrag(Qt::DropActions supportedActions);
    virtual void dragMoveEvent(QDragMoveEvent *event);
    virtual void dropEvent(QDropEvent *event);
#endif
    virtual void timerEvent(QTimerEvent *event);
#ifndef QT_NO_CONTEXTMENU
    virtual void contextMenuEvent(QContextMenuEvent *event);
#endif

private:
    //@cond PRIVATE
    class Private;
    Private *const d;

    Q_PRIVATE_SLOT(d, void itemClicked(const QModelIndex &))
    Q_PRIVATE_SLOT(d, void itemDoubleClicked(const QModelIndex &))
    Q_PRIVATE_SLOT(d, void itemCurrentChanged(const QModelIndex &))
    Q_PRIVATE_SLOT(d, void slotSelectionChanged(const QItemSelection &, const QItemSelection &))
    //@endcond
};

}

#endif