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 "gtkdrawingarea.h"
  28
  29
  30 static void gtk_drawing_area_class_init    (GtkDrawingAreaClass *klass);
  31 static void gtk_drawing_area_init          (GtkDrawingArea      *darea);
  32 static void gtk_drawing_area_realize       (GtkWidget           *widget);
  33 static void gtk_drawing_area_size_allocate (GtkWidget           *widget,
  34                                             GtkAllocation       *allocation);
  35 static void gtk_drawing_area_send_configure (GtkDrawingArea     *darea);
  36
  37
  38 GType
  39 gtk_drawing_area_get_type (void)
  40 {
  41   static GType drawing_area_type = 0;
  42
  43   if (!drawing_area_type)
  44     {
  45       static const GTypeInfo drawing_area_info =
  46       {
  47         sizeof (GtkDrawingAreaClass),
  48         NULL,           /* base_init */
  49         NULL,           /* base_finalize */
  50         (GClassInitFunc) gtk_drawing_area_class_init,
  51         NULL,           /* class_finalize */
  52         NULL,           /* class_data */
  53         sizeof (GtkDrawingArea),
  54         0,              /* n_preallocs */
  55         (GInstanceInitFunc) gtk_drawing_area_init,
  56       };
  57
  58       drawing_area_type =
  59         g_type_register_static (GTK_TYPE_WIDGET, "GtkDrawingArea",
  60                                 &drawing_area_info, 0);
  61     }
  62
  63   return drawing_area_type;
  64 }
  65
  66 static void
  67 gtk_drawing_area_class_init (GtkDrawingAreaClass *class)
  68 {
  69   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  70
  71   widget_class->realize = gtk_drawing_area_realize;
  72   widget_class->size_allocate = gtk_drawing_area_size_allocate;
  73 }
  74
  75 static void
  76 gtk_drawing_area_init (GtkDrawingArea *darea)
  77 {
  78   darea->draw_data = NULL;
  79 }
  80
  81
  82 GtkWidget*
  83 gtk_drawing_area_new (void)
  84 {
  85   return g_object_new (GTK_TYPE_DRAWING_AREA, NULL);
  86 }
  87
  88 void
  89 gtk_drawing_area_size (GtkDrawingArea *darea,
  90                        gint            width,
  91                        gint            height)
  92 {
  93   g_return_if_fail (GTK_IS_DRAWING_AREA (darea));
  94
  95   GTK_WIDGET (darea)->requisition.width = width;
  96   GTK_WIDGET (darea)->requisition.height = height;
  97
  98   gtk_widget_queue_resize (GTK_WIDGET (darea));
  99 }
 100
 101 static void
 102 gtk_drawing_area_realize (GtkWidget *widget)
 103 {
 104   GtkDrawingArea *darea;
 105   GdkWindowAttr attributes;
 106   gint attributes_mask;
 107
 108   g_return_if_fail (GTK_IS_DRAWING_AREA (widget));
 109
 110   darea = GTK_DRAWING_AREA (widget);
 111   GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
 112
 113   attributes.window_type = GDK_WINDOW_CHILD;
 114   attributes.x = widget->allocation.x;
 115   attributes.y = widget->allocation.y;
 116   attributes.width = widget->allocation.width;
 117   attributes.height = widget->allocation.height;
 118   attributes.wclass = GDK_INPUT_OUTPUT;
 119   attributes.visual = gtk_widget_get_visual (widget);
 120   attributes.colormap = gtk_widget_get_colormap (widget);
 121   attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
 122
 123   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
 124
 125   widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
 126   gdk_window_set_user_data (widget->window, darea);
 127
 128   widget->style = gtk_style_attach (widget->style, widget->window);
 129   gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
 130
 131   gtk_drawing_area_send_configure (GTK_DRAWING_AREA (widget));
 132 }
 133
 134 static void
 135 gtk_drawing_area_size_allocate (GtkWidget     *widget,
 136                                 GtkAllocation *allocation)
 137 {
 138   g_return_if_fail (GTK_IS_DRAWING_AREA (widget));
 139   g_return_if_fail (allocation != NULL);
 140
 141   widget->allocation = *allocation;
 142
 143   if (GTK_WIDGET_REALIZED (widget))
 144     {
 145       gdk_window_move_resize (widget->window,
 146                               allocation->x, allocation->y,
 147                               allocation->width, allocation->height);
 148
 149       gtk_drawing_area_send_configure (GTK_DRAWING_AREA (widget));
 150     }
 151 }
 152
 153 static void
 154 gtk_drawing_area_send_configure (GtkDrawingArea *darea)
 155 {
 156   GtkWidget *widget;
 157   GdkEvent *event = gdk_event_new (GDK_CONFIGURE);
 158
 159   widget = GTK_WIDGET (darea);
 160
 161   event->configure.window = g_object_ref (widget->window);
 162   event->configure.send_event = TRUE;
 163   event->configure.x = widget->allocation.x;
 164   event->configure.y = widget->allocation.y;
 165   event->configure.width = widget->allocation.width;
 166   event->configure.height = widget->allocation.height;
 167
 168   gtk_widget_event (widget, event);
 169   gdk_event_free (event);
 170 }