<commit_before>/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 <NAME>, <NAME> and <NAME>
 *
 * 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 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */

#include "config.h"
#include "gtkdrawingarea.h"
#include "gtkintl.h"


/**
 * SECTION:gtkdrawingarea
 * @Short_description: A widget for custom user interface elements
 * @Title: GtkDrawingArea
 * @See_also: #GtkImage
 *
 * The #GtkDrawingArea widget is used for creating custom user interface
 * elements. It's essentially a blank widget; you can draw on it. After
 * creating a drawing area, the application may want to connect to:
 *
 * <itemizedlist>
 *   <listitem>
 *     <para>
 *     Mouse and button press signals to respond to input from
 *     the user. (Use gtk_widget_add_events() to enable events
 *     you wish to receive.)
 *     </para>
 *   </listitem>
 *   <listitem>
 *     <para>
 *     The #GtkWidget::realize signal to take any necessary actions
 *     when the widget is instantiated on a particular display.
 *     (Create GDK resources in response to this signal.)
 *     </para>
 *   </listitem>
 *   <listitem>
 *     <para>
 *     The #GtkWidget::configure-event signal to take any necessary
 *     actions when the widget changes size.
 *     </para>
 *   </listitem>
 *   <listitem>
 *     <para>
 *     The #GtkWidget::draw signal to handle redrawing the
 *     contents of the widget.
 *     </para>
 *   </listitem>
 * </itemizedlist>
 *
 * The following code portion demonstrates using a drawing
 * area to display a circle in the normal widget foreground
 * color.
 *
 * Note that GDK automatically clears the exposed area to the
 * background color before sending the expose event, and that
 * drawing is implicitly clipped to the exposed area.
 *
 * <example>
 * <title>Simple GtkDrawingArea usage</title>
 * <programlisting>
 * gboolean
 * draw_callback (GtkWidget *widget, cairo_t *cr, gpointer data)
 * {
 *   guint width, height;
 *   GdkRGBA color;
 *
 *   width = gtk_widget_get_allocated_width (widget);
 *   height = gtk_widget_get_allocated_height (widget);
 *   cairo_arc (cr,
 *              width / 2.0, height / 2.0,
 *              MIN (width, height) / 2.0,
 *              0, 2 * G_PI);
 *
 *   gtk_style_context_get_color (gtk_widget_get_style_context (widget),
 *                                0,
 *                                &amp;color);
 *   gdk_cairo_set_source_rgba (cr, &amp;color);
 *
 *   cairo_fill (cr);
 *
 *  return FALSE;
 * }
 * [...]
 *   GtkWidget &ast;drawing_area = gtk_drawing_area_new (<!-- -->);
 *   gtk_widget_set_size_request (drawing_area, 100, 100);
 *   g_signal_connect (G_OBJECT (drawing_area), "draw",
 *                     G_CALLBACK (draw_callback), NULL);
 * </programlisting>
 * </example>
 *
 * Draw signals are normally delivered when a drawing area first comes
 * onscreen, or when it's covered by another window and then uncovered.
 * You can also force an expose event by adding to the "damage region"
 * of the drawing area's window; gtk_widget_queue_draw_area() and
 * gdk_window_invalidate_rect() are equally good ways to do this.
 * You'll then get a draw signal for the invalid region.
 *
 * The available routines for drawing are documented on the <link
 * linkend="gdk3-Cairo-Interaction">GDK Drawing Primitives</link> page
 * and the cairo documentation.
 *
 * To receive mouse events on a drawing area, you will need to enable
 * them with gtk_widget_add_events(). To receive keyboard events, you
 * will need to set the #GTK_CAN_FOCUS flag on the drawing area, and
 * should probably draw some user-visible indication that the drawing
 * area is focused. Use the GTK_HAS_FOCUS() macro in your expose event
 * handler to decide whether to draw the focus indicator. See
 * gtk_paint_focus() for one way to draw focus.
 */

static void gtk_drawing_area_realize       (GtkWidget           *widget);
static void gtk_drawing_area_size_allocate (GtkWidget           *widget,
                                            GtkAllocation       *allocation);
static void gtk_drawing_area_send_configure (GtkDrawingArea     *darea);

G_DEFINE_TYPE (GtkDrawingArea, gtk_drawing_area, GTK_TYPE_WIDGET)

static void
gtk_drawing_area_class_init (GtkDrawingAreaClass *class)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);<commit_msg>Do not use old functions in the docs.<commit_after>/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 <NAME>, <NAME> and <NAME>
 *
 * 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 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */

#include "config.h"
#include "gtkdrawingarea.h"
#include "gtkintl.h"


/**
 * SECTION:gtkdrawingarea
 * @Short_description: A widget for custom user interface elements
 * @Title: GtkDrawingArea
 * @See_also: #GtkImage
 *
 * The #GtkDrawingArea widget is used for creating custom user interface
 * elements. It's essentially a blank widget; you can draw on it. After
 * creating a drawing area, the application may want to connect to:
 *
 * <itemizedlist>
 *   <listitem>
 *     <para>
 *     Mouse and button press signals to respond to input from
 *     the user. (Use gtk_widget_add_events() to enable events
 *     you wish to receive.)
 *     </para>
 *   </listitem>
 *   <listitem>
 *     <para>
 *     The #GtkWidget::realize signal to take any necessary actions
 *     when the widget is instantiated on a particular display.
 *     (Create GDK resources in response to this signal.)
 *     </para>
 *   </listitem>
 *   <listitem>
 *     <para>
 *     The #GtkWidget::configure-event signal to take any necessary
 *     actions when the widget changes size.
 *     </para>
 *   </listitem>
 *   <listitem>
 *     <para>
 *     The #GtkWidget::draw signal to handle redrawing the
 *     contents of the widget.
 *     </para>
 *   </listitem>
 * </itemizedlist>
 *
 * The following code portion demonstrates using a drawing
 * area to display a circle in the normal widget foreground
 * color.
 *
 * Note that GDK automatically clears the exposed area to the
 * background color before sending the expose event, and that
 * drawing is implicitly clipped to the exposed area.
 *
 * <example>
 * <title>Simple GtkDrawingArea usage</title>
 * <programlisting>
 * gboolean
 * draw_callback (GtkWidget *widget, cairo_t *cr, gpointer data)
 * {
 *   guint width, height;
 *   GdkRGBA color;
 *
 *   width = gtk_widget_get_allocated_width (widget);
 *   height = gtk_widget_get_allocated_height (widget);
 *   cairo_arc (cr,
 *              width / 2.0, height / 2.0,
 *              MIN (width, height) / 2.0,
 *              0, 2 * G_PI);
 *
 *   gtk_style_context_get_color (gtk_widget_get_style_context (widget),
 *                                0,
 *                                &amp;color);
 *   gdk_cairo_set_source_rgba (cr, &amp;color);
 *
 *   cairo_fill (cr);
 *
 *  return FALSE;
 * }
 * [...]
 *   GtkWidget &ast;drawing_area = gtk_drawing_area_new (<!-- -->);
 *   gtk_widget_set_size_request (drawing_area, 100, 100);
 *   g_signal_connect (G_OBJECT (drawing_area), "draw",
 *                     G_CALLBACK (draw_callback), NULL);
 * </programlisting>
 * </example>
 *
 * Draw signals are normally delivered when a drawing area first comes
 * onscreen, or when it's covered by another window and then uncovered.
 * You can also force an expose event by adding to the "damage region"
 * of the drawing area's window; gtk_widget_queue_draw_area() and
 * gdk_window_invalidate_rect() are equally good ways to do this.
 * You'll then get a draw signal for the invalid region.
 *
 * The available routines for drawing are documented on the <link
 * linkend="gdk3-Cairo-Interaction">GDK Drawing Primitives</link> page
 * and the cairo documentation.
 *
 * To receive mouse events on a drawing area, you will need to enable
 * them with gtk_widget_add_events(). To receive keyboard events, you
 * will need to set the "can-focus" property on the drawing area, and you
 * should probably draw some user-visible indication that the drawing
 * area is focused. Use gtk_widget_has_focus() in your expose event
 * handler to decide whether to draw the focus indicator. See
 * gtk_render_focus() for one way to draw focus.
 */

static void gtk_drawing_area_realize       (GtkWidget           *widget);
static void gtk_drawing_area_size_allocate (GtkWidget           *widget,
                                            GtkAllocation       *allocation);
static void gtk_drawing_area_send_configure (GtkDrawingArea     *darea);

G_DEFINE_TYPE (GtkDrawingArea, gtk_drawing_area, GTK_TYPE_WIDGET)

static void
gtk_drawing_area_class_init (GtkDrawingAreaClass *class)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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