Pileus Git - ~andy/gtk/blob - modules/other/gail/gailpaned.c

   1 /* GAIL - The GNOME Accessibility Enabling Library
   2  * Copyright 2001, 2002, 2003 Sun Microsystems Inc.
   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 #include "config.h"
  21
  22 #include <string.h>
  23 #include <gtk/gtk.h>
  24 #include "gailpaned.h"
  25
  26 static void         gail_paned_class_init          (GailPanedClass *klass);
  27
  28 static void         gail_paned_init                (GailPaned      *paned);
  29
  30 static void         gail_paned_real_initialize     (AtkObject      *obj,
  31                                                     gpointer       data);
  32 static void         gail_paned_size_allocate_gtk   (GtkWidget      *widget,
  33                                                     GtkAllocation  *allocation);
  34 static void         atk_value_interface_init       (AtkValueIface  *iface);
  35 static void         gail_paned_get_current_value   (AtkValue       *obj,
  36                                                     GValue         *value);
  37 static void         gail_paned_get_maximum_value   (AtkValue       *obj,
  38                                                     GValue         *value);
  39 static void         gail_paned_get_minimum_value   (AtkValue       *obj,
  40                                                     GValue         *value);
  41 static gboolean     gail_paned_set_current_value   (AtkValue       *obj,
  42                                                     const GValue   *value);
  43
  44 G_DEFINE_TYPE_WITH_CODE (GailPaned, gail_paned, GAIL_TYPE_CONTAINER,
  45                          G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
  46
  47 static void
  48 gail_paned_class_init (GailPanedClass *klass)
  49 {
  50   AtkObjectClass  *class = ATK_OBJECT_CLASS (klass);
  51
  52   class->initialize = gail_paned_real_initialize;
  53 }
  54
  55 static void
  56 gail_paned_init (GailPaned *paned)
  57 {
  58 }
  59
  60 static void
  61 gail_paned_real_initialize (AtkObject *obj,
  62                             gpointer  data)
  63 {
  64   ATK_OBJECT_CLASS (gail_paned_parent_class)->initialize (obj, data);
  65
  66   g_signal_connect (data,
  67                     "size_allocate",
  68                     G_CALLBACK (gail_paned_size_allocate_gtk),
  69                     NULL);
  70
  71   obj->role = ATK_ROLE_SPLIT_PANE;
  72 }
  73
  74 static void
  75 gail_paned_size_allocate_gtk (GtkWidget      *widget,
  76                               GtkAllocation  *allocation)
  77 {
  78   AtkObject *obj = gtk_widget_get_accessible (widget);
  79
  80   g_object_notify (G_OBJECT (obj), "accessible-value");
  81 }
  82
  83
  84 static void
  85 atk_value_interface_init (AtkValueIface *iface)
  86 {
  87   iface->get_current_value = gail_paned_get_current_value;
  88   iface->get_maximum_value = gail_paned_get_maximum_value;
  89   iface->get_minimum_value = gail_paned_get_minimum_value;
  90   iface->set_current_value = gail_paned_set_current_value;
  91 }
  92
  93 static void
  94 gail_paned_get_current_value (AtkValue             *obj,
  95                               GValue               *value)
  96 {
  97   GtkWidget* widget;
  98   gint current_value;
  99
 100   widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
 101   if (widget == NULL)
 102     /* State is defunct */
 103     return;
 104
 105   current_value = gtk_paned_get_position (GTK_PANED (widget));
 106   memset (value,  0, sizeof (GValue));
 107   g_value_init (value, G_TYPE_INT);
 108   g_value_set_int (value,current_value);
 109 }
 110
 111 static void
 112 gail_paned_get_maximum_value (AtkValue             *obj,
 113                               GValue               *value)
 114 {
 115   GtkWidget* widget;
 116   gint maximum_value;
 117
 118   widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
 119   if (widget == NULL)
 120     /* State is defunct */
 121     return;
 122
 123   g_object_get (GTK_PANED (widget),
 124                 "max-position", &maximum_value,
 125                 NULL);
 126   memset (value,  0, sizeof (GValue));
 127   g_value_init (value, G_TYPE_INT);
 128   g_value_set_int (value, maximum_value);
 129 }
 130
 131 static void
 132 gail_paned_get_minimum_value (AtkValue             *obj,
 133                               GValue               *value)
 134 {
 135   GtkWidget* widget;
 136   gint minimum_value;
 137
 138   widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
 139   if (widget == NULL)
 140     /* State is defunct */
 141     return;
 142
 143   g_object_get (GTK_PANED (widget),
 144                 "min-position", &minimum_value,
 145                 NULL);
 146   memset (value,  0, sizeof (GValue));
 147   g_value_init (value, G_TYPE_INT);
 148   g_value_set_int (value, minimum_value);
 149 }
 150
 151 /*
 152  * Calling atk_value_set_current_value() is no guarantee that the value is
 153  * acceptable; it is necessary to listen for accessible-value signals
 154  * and check whether the current value has been changed or check what the
 155  * maximum and minimum values are.
 156  */
 157
 158 static gboolean
 159 gail_paned_set_current_value (AtkValue             *obj,
 160                               const GValue         *value)
 161 {
 162   GtkWidget* widget;
 163   gint new_value;
 164
 165   widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
 166   if (widget == NULL)
 167     /* State is defunct */
 168     return FALSE;
 169
 170   if (G_VALUE_HOLDS_INT (value))
 171     {
 172       new_value = g_value_get_int (value);
 173       gtk_paned_set_position (GTK_PANED (widget), new_value);
 174
 175       return TRUE;
 176     }
 177   else
 178     return FALSE;
 179 }