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/usr/include/evolution-3.10/libgnomecanvas/gnome-canvas-widget.h is in evolution-dev 3.10.4-0ubuntu1.

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/*
 * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
 * All rights reserved.
 *
 * This file is part of the Gnome Library.
 *
 * The Gnome 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.
 *
 * The Gnome 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 the Gnome Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
  @NOTATION@
 */
/* Widget item type for GnomeCanvas widget
 *
 * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget.  Tk is
 * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
 *
 *
 * Author: Federico Mena <federico@nuclecu.unam.mx>
 */

#ifndef GNOME_CANVAS_WIDGET_H
#define GNOME_CANVAS_WIDGET_H

#include <libgnomecanvas/gnome-canvas.h>

G_BEGIN_DECLS

/* Widget item for canvas.  The widget is positioned with respect to an anchor point.
 * The following object arguments are available:
 *
 * name			type			read/write	description
 * ------------------------------------------------------------------------------------------
 * widget		GtkWidget*		RW		Pointer to the widget
 * x			gdouble			RW		X coordinate of anchor point
 * y			gdouble			RW		Y coordinate of anchor point
 * width		gdouble			RW		Width of widget (see below)
 * height		gdouble			RW		Height of widget (see below)
 * size_pixels		boolean			RW		Specifies whether the widget size
 *								is specified in pixels or canvas units.
 *								If it is in pixels, then the widget will not
 *								be scaled when the canvas zoom factor changes.
 *								Otherwise, it will be scaled.
 */

#define GNOME_TYPE_CANVAS_WIDGET            (gnome_canvas_widget_get_type ())
#define GNOME_CANVAS_WIDGET(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GNOME_TYPE_CANVAS_WIDGET, GnomeCanvasWidget))
#define GNOME_CANVAS_WIDGET_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GNOME_TYPE_CANVAS_WIDGET, GnomeCanvasWidgetClass))
#define GNOME_IS_CANVAS_WIDGET(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GNOME_TYPE_CANVAS_WIDGET))
#define GNOME_IS_CANVAS_WIDGET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GNOME_TYPE_CANVAS_WIDGET))
#define GNOME_CANVAS_WIDGET_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GNOME_TYPE_CANVAS_WIDGET, GnomeCanvasWidgetClass))

typedef struct _GnomeCanvasWidget GnomeCanvasWidget;
typedef struct _GnomeCanvasWidgetClass GnomeCanvasWidgetClass;

struct _GnomeCanvasWidget {
	GnomeCanvasItem item;

	GtkWidget *widget;		/* The child widget */

	gdouble x, y;			/* Position at anchor */
	gdouble width, height;		/* Dimensions of widget */

	gint cx, cy;			/* Top-left canvas coordinates for widget */
	gint cwidth, cheight;		/* Size of widget in pixels */

	guint size_pixels : 1;		/* Is size specified in (unchanging) pixels or units (get scaled)? */
	guint in_destroy : 1;		/* Is child widget being destroyed? */
};

struct _GnomeCanvasWidgetClass {
	GnomeCanvasItemClass parent_class;
};

/* Standard Gtk function */
GType gnome_canvas_widget_get_type (void) G_GNUC_CONST;

G_END_DECLS

#endif