gtkdrawingarea.c 4.98 KB
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/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 */
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/*
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 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
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 * 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/. 
 */

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#include "gtkdrawingarea.h"


static void gtk_drawing_area_class_init    (GtkDrawingAreaClass *klass);
static void gtk_drawing_area_init          (GtkDrawingArea      *darea);
static void gtk_drawing_area_realize       (GtkWidget           *widget);
static void gtk_drawing_area_size_allocate (GtkWidget           *widget,
					    GtkAllocation       *allocation);
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static void gtk_drawing_area_send_configure (GtkDrawingArea     *darea);
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GType
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gtk_drawing_area_get_type (void)
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{
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  static GType drawing_area_type = 0;
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  if (!drawing_area_type)
    {
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      static const GTypeInfo drawing_area_info =
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      {
	sizeof (GtkDrawingAreaClass),
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	NULL,		/* base_init */
	NULL,		/* base_finalize */
	(GClassInitFunc) gtk_drawing_area_class_init,
	NULL,		/* class_finalize */
	NULL,		/* class_data */
	sizeof (GtkDrawingArea),
	0,		/* n_preallocs */
	(GInstanceInitFunc) gtk_drawing_area_init,
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      };

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      drawing_area_type =
	g_type_register_static (GTK_TYPE_WIDGET, "GtkDrawingArea",
				&drawing_area_info, 0);
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    }

  return drawing_area_type;
}

static void
gtk_drawing_area_class_init (GtkDrawingAreaClass *class)
{
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  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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  widget_class->realize = gtk_drawing_area_realize;
  widget_class->size_allocate = gtk_drawing_area_size_allocate;
}

static void
gtk_drawing_area_init (GtkDrawingArea *darea)
{
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  darea->draw_data = NULL;
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}


GtkWidget*
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gtk_drawing_area_new (void)
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{
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  return g_object_new (GTK_TYPE_DRAWING_AREA, NULL);
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}

void
gtk_drawing_area_size (GtkDrawingArea *darea,
		       gint            width,
		       gint            height)
{
  g_return_if_fail (GTK_IS_DRAWING_AREA (darea));

  GTK_WIDGET (darea)->requisition.width = width;
  GTK_WIDGET (darea)->requisition.height = height;
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  gtk_widget_queue_resize (GTK_WIDGET (darea));
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}

static void
gtk_drawing_area_realize (GtkWidget *widget)
{
  GtkDrawingArea *darea;
  GdkWindowAttr attributes;
  gint attributes_mask;

  g_return_if_fail (GTK_IS_DRAWING_AREA (widget));

  darea = GTK_DRAWING_AREA (widget);
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
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  attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
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  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

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  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
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  gdk_window_set_user_data (widget->window, darea);

  widget->style = gtk_style_attach (widget->style, widget->window);
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
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  gtk_drawing_area_send_configure (GTK_DRAWING_AREA (widget));
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}

static void
gtk_drawing_area_size_allocate (GtkWidget     *widget,
				GtkAllocation *allocation)
{
  g_return_if_fail (GTK_IS_DRAWING_AREA (widget));
  g_return_if_fail (allocation != NULL);

  widget->allocation = *allocation;

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
			      allocation->x, allocation->y,
			      allocation->width, allocation->height);

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      gtk_drawing_area_send_configure (GTK_DRAWING_AREA (widget));
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    }
}
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static void
gtk_drawing_area_send_configure (GtkDrawingArea *darea)
{
  GtkWidget *widget;
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  GdkEvent *event = gdk_event_new (GDK_CONFIGURE);
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  widget = GTK_WIDGET (darea);

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  event->configure.window = g_object_ref (widget->window);
  event->configure.send_event = TRUE;
  event->configure.x = widget->allocation.x;
  event->configure.y = widget->allocation.y;
  event->configure.width = widget->allocation.width;
  event->configure.height = widget->allocation.height;
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  gtk_widget_event (widget, event);
  gdk_event_free (event);
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}