Pileus Git - ~andy/gtk/blob - gtk/gtkdrawingarea.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <config.h>
  28 #include "gtkalias.h"
  29 #include "gtkdrawingarea.h"
  30
  31
  32 static void gtk_drawing_area_class_init    (GtkDrawingAreaClass *klass);
  33 static void gtk_drawing_area_init          (GtkDrawingArea      *darea);
  34 static void gtk_drawing_area_realize       (GtkWidget           *widget);
  35 static void gtk_drawing_area_size_allocate (GtkWidget           *widget,
  36                                             GtkAllocation       *allocation);
  37 static void gtk_drawing_area_send_configure (GtkDrawingArea     *darea);
  38
  39
  40 GType
  41 gtk_drawing_area_get_type (void)
  42 {
  43   static GType drawing_area_type = 0;
  44
  45   if (!drawing_area_type)
  46     {
  47       static const GTypeInfo drawing_area_info =
  48       {
  49         sizeof (GtkDrawingAreaClass),
  50         NULL,           /* base_init */
  51         NULL,           /* base_finalize */
  52         (GClassInitFunc) gtk_drawing_area_class_init,
  53         NULL,           /* class_finalize */
  54         NULL,           /* class_data */
  55         sizeof (GtkDrawingArea),
  56         0,              /* n_preallocs */
  57         (GInstanceInitFunc) gtk_drawing_area_init,
  58       };
  59
  60       drawing_area_type =
  61         g_type_register_static (GTK_TYPE_WIDGET, "GtkDrawingArea",
  62                                 &drawing_area_info, 0);
  63     }
  64
  65   return drawing_area_type;
  66 }
  67
  68 static void
  69 gtk_drawing_area_class_init (GtkDrawingAreaClass *class)
  70 {
  71   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  72
  73   widget_class->realize = gtk_drawing_area_realize;
  74   widget_class->size_allocate = gtk_drawing_area_size_allocate;
  75 }
  76
  77 static void
  78 gtk_drawing_area_init (GtkDrawingArea *darea)
  79 {
  80   darea->draw_data = NULL;
  81 }
  82
  83
  84 GtkWidget*
  85 gtk_drawing_area_new (void)
  86 {
  87   return g_object_new (GTK_TYPE_DRAWING_AREA, NULL);
  88 }
  89
  90 void
  91 gtk_drawing_area_size (GtkDrawingArea *darea,
  92                        gint            width,
  93                        gint            height)
  94 {
  95   g_return_if_fail (GTK_IS_DRAWING_AREA (darea));
  96
  97   GTK_WIDGET (darea)->requisition.width = width;
  98   GTK_WIDGET (darea)->requisition.height = height;
  99
 100   gtk_widget_queue_resize (GTK_WIDGET (darea));
 101 }
 102
 103 static void
 104 gtk_drawing_area_realize (GtkWidget *widget)
 105 {
 106   GtkDrawingArea *darea;
 107   GdkWindowAttr attributes;
 108   gint attributes_mask;
 109
 110   g_return_if_fail (GTK_IS_DRAWING_AREA (widget));
 111
 112   darea = GTK_DRAWING_AREA (widget);
 113   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 114
 115   attributes.window_type = GDK_WINDOW_CHILD;
 116   attributes.x = widget->allocation.x;
 117   attributes.y = widget->allocation.y;
 118   attributes.width = widget->allocation.width;
 119   attributes.height = widget->allocation.height;
 120   attributes.wclass = GDK_INPUT_OUTPUT;
 121   attributes.visual = gtk_widget_get_visual (widget);
 122   attributes.colormap = gtk_widget_get_colormap (widget);
 123   attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 124
 125   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 126
 127   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
 128   gdk_window_set_user_data (widget->window, darea);
 129
 130   widget->style = gtk_style_attach (widget->style, widget->window);
 131   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 132
 133   gtk_drawing_area_send_configure (GTK_DRAWING_AREA (widget));
 134 }
 135
 136 static void
 137 gtk_drawing_area_size_allocate (GtkWidget     *widget,
 138                                 GtkAllocation *allocation)
 139 {
 140   g_return_if_fail (GTK_IS_DRAWING_AREA (widget));
 141   g_return_if_fail (allocation != NULL);
 142
 143   widget->allocation = *allocation;
 144
 145   if (GTK_WIDGET_REALIZED (widget))
 146     {
 147       gdk_window_move_resize (widget->window,
 148                               allocation->x, allocation->y,
 149                               allocation->width, allocation->height);
 150
 151       gtk_drawing_area_send_configure (GTK_DRAWING_AREA (widget));
 152     }
 153 }
 154
 155 static void
 156 gtk_drawing_area_send_configure (GtkDrawingArea *darea)
 157 {
 158   GtkWidget *widget;
 159   GdkEvent *event = gdk_event_new (GDK_CONFIGURE);
 160
 161   widget = GTK_WIDGET (darea);
 162
 163   event->configure.window = g_object_ref (widget->window);
 164   event->configure.send_event = TRUE;
 165   event->configure.x = widget->allocation.x;
 166   event->configure.y = widget->allocation.y;
 167   event->configure.width = widget->allocation.width;
 168   event->configure.height = widget->allocation.height;
 169
 170   gtk_widget_event (widget, event);
 171   gdk_event_free (event);
 172 }