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 <string.h>
  21 #include <gtk/gtk.h>
  22 #include "gailpaned.h"
  23
  24 static void         gail_paned_class_init          (GailPanedClass *klass);
  25
  26 static void         gail_paned_init                (GailPaned      *paned);
  27
  28 static void         gail_paned_real_initialize     (AtkObject      *obj,
  29                                                     gpointer       data);
  30 static void         gail_paned_size_allocate_gtk   (GtkWidget      *widget,
  31                                                     GtkAllocation  *allocation);
  32
  33 static AtkStateSet* gail_paned_ref_state_set       (AtkObject      *accessible);
  34
  35 static void         atk_value_interface_init       (AtkValueIface  *iface);
  36 static void         gail_paned_get_current_value   (AtkValue       *obj,
  37                                                     GValue         *value);
  38 static void         gail_paned_get_maximum_value   (AtkValue       *obj,
  39                                                     GValue         *value);
  40 static void         gail_paned_get_minimum_value   (AtkValue       *obj,
  41                                                     GValue         *value);
  42 static gboolean     gail_paned_set_current_value   (AtkValue       *obj,
  43                                                     const GValue   *value);
  44
  45 G_DEFINE_TYPE_WITH_CODE (GailPaned, gail_paned, GAIL_TYPE_CONTAINER,
  46                          G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
  47
  48 static void
  49 gail_paned_class_init (GailPanedClass *klass)
  50 {
  51   AtkObjectClass  *class = ATK_OBJECT_CLASS (klass);
  52
  53   class->ref_state_set = gail_paned_ref_state_set;
  54   class->initialize = gail_paned_real_initialize;
  55 }
  56
  57 static void
  58 gail_paned_init (GailPaned *paned)
  59 {
  60 }
  61
  62 AtkObject*
  63 gail_paned_new (GtkWidget *widget)
  64 {
  65   GObject *object;
  66   AtkObject *accessible;
  67
  68   g_return_val_if_fail (GTK_IS_PANED (widget), NULL);
  69
  70   object = g_object_new (GAIL_TYPE_PANED, NULL);
  71
  72   accessible = ATK_OBJECT (object);
  73   atk_object_initialize (accessible, widget);
  74
  75   return accessible;
  76 }
  77
  78 static AtkStateSet*
  79 gail_paned_ref_state_set (AtkObject *accessible)
  80 {
  81   AtkStateSet *state_set;
  82   GtkWidget *widget;
  83
  84   state_set = ATK_OBJECT_CLASS (gail_paned_parent_class)->ref_state_set (accessible);
  85   widget = GTK_ACCESSIBLE (accessible)->widget;
  86
  87   if (widget == NULL)
  88     return state_set;
  89
  90   if (GTK_IS_VPANED (widget))
  91     atk_state_set_add_state (state_set, ATK_STATE_VERTICAL);
  92   else if (GTK_IS_HPANED (widget))
  93     atk_state_set_add_state (state_set, ATK_STATE_HORIZONTAL);
  94
  95   return state_set;
  96 }
  97
  98 static void
  99 gail_paned_real_initialize (AtkObject *obj,
 100                             gpointer  data)
 101 {
 102   ATK_OBJECT_CLASS (gail_paned_parent_class)->initialize (obj, data);
 103
 104   g_signal_connect (data,
 105                     "size_allocate",
 106                     G_CALLBACK (gail_paned_size_allocate_gtk),
 107                     NULL);
 108
 109   obj->role = ATK_ROLE_SPLIT_PANE;
 110 }
 111
 112 static void
 113 gail_paned_size_allocate_gtk (GtkWidget      *widget,
 114                               GtkAllocation  *allocation)
 115 {
 116   AtkObject *obj = gtk_widget_get_accessible (widget);
 117
 118   g_object_notify (G_OBJECT (obj), "accessible-value");
 119 }
 120
 121
 122 static void
 123 atk_value_interface_init (AtkValueIface *iface)
 124 {
 125   iface->get_current_value = gail_paned_get_current_value;
 126   iface->get_maximum_value = gail_paned_get_maximum_value;
 127   iface->get_minimum_value = gail_paned_get_minimum_value;
 128   iface->set_current_value = gail_paned_set_current_value;
 129 }
 130
 131 static void
 132 gail_paned_get_current_value (AtkValue             *obj,
 133                               GValue               *value)
 134 {
 135   GtkWidget* widget;
 136   gint current_value;
 137
 138   widget = GTK_ACCESSIBLE (obj)->widget;
 139   if (widget == NULL)
 140     /* State is defunct */
 141     return;
 142
 143   current_value = gtk_paned_get_position (GTK_PANED (widget));
 144   memset (value,  0, sizeof (GValue));
 145   g_value_init (value, G_TYPE_INT);
 146   g_value_set_int (value,current_value);
 147 }
 148
 149 static void
 150 gail_paned_get_maximum_value (AtkValue             *obj,
 151                               GValue               *value)
 152 {
 153   GtkWidget* widget;
 154   gint maximum_value;
 155
 156   widget = GTK_ACCESSIBLE (obj)->widget;
 157   if (widget == NULL)
 158     /* State is defunct */
 159     return;
 160
 161   maximum_value = GTK_PANED (widget)->max_position;
 162   memset (value,  0, sizeof (GValue));
 163   g_value_init (value, G_TYPE_INT);
 164   g_value_set_int (value, maximum_value);
 165 }
 166
 167 static void
 168 gail_paned_get_minimum_value (AtkValue             *obj,
 169                               GValue               *value)
 170 {
 171   GtkWidget* widget;
 172   gint minimum_value;
 173
 174   widget = GTK_ACCESSIBLE (obj)->widget;
 175   if (widget == NULL)
 176     /* State is defunct */
 177     return;
 178
 179   minimum_value = GTK_PANED (widget)->min_position;
 180   memset (value,  0, sizeof (GValue));
 181   g_value_init (value, G_TYPE_INT);
 182   g_value_set_int (value, minimum_value);
 183 }
 184
 185 /*
 186  * Calling atk_value_set_current_value() is no guarantee that the value is
 187  * acceptable; it is necessary to listen for accessible-value signals
 188  * and check whether the current value has been changed or check what the
 189  * maximum and minimum values are.
 190  */
 191
 192 static gboolean
 193 gail_paned_set_current_value (AtkValue             *obj,
 194                               const GValue         *value)
 195 {
 196   GtkWidget* widget;
 197   gint new_value;
 198
 199   widget = GTK_ACCESSIBLE (obj)->widget;
 200   if (widget == NULL)
 201     /* State is defunct */
 202     return FALSE;
 203
 204   if (G_VALUE_HOLDS_INT (value))
 205     {
 206       new_value = g_value_get_int (value);
 207       gtk_paned_set_position (GTK_PANED (widget), new_value);
 208
 209       return TRUE;
 210     }
 211   else
 212     return FALSE;
 213 }