Pileus Git - ~andy/gtk/blob - gtk/a11y/gailadjustment.c

   1 /* GAIL - The GNOME Accessibility Implementation 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 "gailadjustment.h"
  25
  26 static void      gail_adjustment_class_init        (GailAdjustmentClass *klass);
  27
  28 static void      gail_adjustment_init              (GailAdjustment      *adjustment);
  29
  30 static void      gail_adjustment_real_initialize   (AtkObject           *obj,
  31                                                     gpointer            data);
  32
  33 static void      atk_value_interface_init          (AtkValueIface       *iface);
  34
  35 static void      gail_adjustment_get_current_value (AtkValue            *obj,
  36                                                     GValue              *value);
  37 static void      gail_adjustment_get_maximum_value (AtkValue            *obj,
  38                                                     GValue              *value);
  39 static void      gail_adjustment_get_minimum_value (AtkValue            *obj,
  40                                                     GValue              *value);
  41 static void      gail_adjustment_get_minimum_increment (AtkValue        *obj,
  42                                                     GValue              *value);
  43 static gboolean  gail_adjustment_set_current_value (AtkValue            *obj,
  44                                                     const GValue        *value);
  45
  46 G_DEFINE_TYPE_WITH_CODE (GailAdjustment, gail_adjustment, ATK_TYPE_OBJECT,
  47                          G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
  48
  49 static void
  50 gail_adjustment_class_init (GailAdjustmentClass *klass)
  51 {
  52   AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
  53
  54   class->initialize = gail_adjustment_real_initialize;
  55 }
  56
  57 static void
  58 gail_adjustment_init (GailAdjustment *adjustment)
  59 {
  60 }
  61
  62 AtkObject*
  63 gail_adjustment_new (GtkAdjustment *adjustment)
  64 {
  65   GObject *object;
  66   AtkObject *atk_object;
  67
  68   g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), NULL);
  69
  70   object = g_object_new (GAIL_TYPE_ADJUSTMENT, NULL);
  71
  72   atk_object = ATK_OBJECT (object);
  73   atk_object_initialize (atk_object, adjustment);
  74
  75   return atk_object;
  76 }
  77
  78 static void
  79 gail_adjustment_real_initialize (AtkObject *obj,
  80                                  gpointer  data)
  81 {
  82   GtkAdjustment *adjustment;
  83   GailAdjustment *gail_adjustment;
  84
  85   ATK_OBJECT_CLASS (gail_adjustment_parent_class)->initialize (obj, data);
  86
  87   adjustment = GTK_ADJUSTMENT (data);
  88
  89   obj->role = ATK_ROLE_UNKNOWN;
  90   gail_adjustment = GAIL_ADJUSTMENT (obj);
  91   gail_adjustment->adjustment = adjustment;
  92
  93   g_object_add_weak_pointer (G_OBJECT (adjustment),
  94                              (gpointer *) &gail_adjustment->adjustment);
  95 }
  96
  97 static void
  98 atk_value_interface_init (AtkValueIface *iface)
  99 {
 100   iface->get_current_value = gail_adjustment_get_current_value;
 101   iface->get_maximum_value = gail_adjustment_get_maximum_value;
 102   iface->get_minimum_value = gail_adjustment_get_minimum_value;
 103   iface->get_minimum_increment = gail_adjustment_get_minimum_increment;
 104   iface->set_current_value = gail_adjustment_set_current_value;
 105 }
 106
 107 static void
 108 gail_adjustment_get_current_value (AtkValue             *obj,
 109                                    GValue               *value)
 110 {
 111   GtkAdjustment* adjustment;
 112   gdouble current_value;
 113
 114   adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
 115   if (adjustment == NULL)
 116   {
 117     /* State is defunct */
 118     return;
 119   }
 120
 121   current_value = gtk_adjustment_get_value (adjustment);
 122   memset (value,  0, sizeof (GValue));
 123   g_value_init (value, G_TYPE_DOUBLE);
 124   g_value_set_double (value,current_value);
 125 }
 126
 127 static void
 128 gail_adjustment_get_maximum_value (AtkValue             *obj,
 129                                    GValue               *value)
 130 {
 131   GtkAdjustment* adjustment;
 132   gdouble maximum_value;
 133
 134   adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
 135   if (adjustment == NULL)
 136   {
 137     /* State is defunct */
 138     return;
 139   }
 140
 141   maximum_value = gtk_adjustment_get_upper (adjustment);
 142   memset (value,  0, sizeof (GValue));
 143   g_value_init (value, G_TYPE_DOUBLE);
 144   g_value_set_double (value, maximum_value);
 145 }
 146
 147 static void
 148 gail_adjustment_get_minimum_value (AtkValue             *obj,
 149                                    GValue               *value)
 150 {
 151   GtkAdjustment* adjustment;
 152   gdouble minimum_value;
 153
 154   adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
 155   if (adjustment == NULL)
 156   {
 157     /* State is defunct */
 158     return;
 159   }
 160
 161   minimum_value = gtk_adjustment_get_lower (adjustment);
 162   memset (value,  0, sizeof (GValue));
 163   g_value_init (value, G_TYPE_DOUBLE);
 164   g_value_set_double (value, minimum_value);
 165 }
 166
 167 static void
 168 gail_adjustment_get_minimum_increment (AtkValue        *obj,
 169                                        GValue          *value)
 170 {
 171   GtkAdjustment* adjustment;
 172   gdouble minimum_increment;
 173
 174   adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
 175   if (adjustment == NULL)
 176   {
 177     /* State is defunct */
 178     return;
 179   }
 180
 181   if (gtk_adjustment_get_step_increment (adjustment) != 0 &&
 182       gtk_adjustment_get_page_increment (adjustment) != 0)
 183     {
 184       if (ABS (gtk_adjustment_get_step_increment (adjustment)) < ABS (gtk_adjustment_get_page_increment (adjustment)))
 185         minimum_increment = gtk_adjustment_get_step_increment (adjustment);
 186       else
 187         minimum_increment = gtk_adjustment_get_page_increment (adjustment);
 188     }
 189   else if (gtk_adjustment_get_step_increment (adjustment) == 0 &&
 190            gtk_adjustment_get_page_increment (adjustment) == 0)
 191     {
 192       minimum_increment = 0;
 193     }
 194   else if (gtk_adjustment_get_step_increment (adjustment) == 0)
 195     {
 196       minimum_increment = gtk_adjustment_get_page_increment (adjustment);
 197     }
 198   else
 199     {
 200       minimum_increment = gtk_adjustment_get_step_increment (adjustment);
 201     }
 202
 203   memset (value,  0, sizeof (GValue));
 204   g_value_init (value, G_TYPE_DOUBLE);
 205   g_value_set_double (value, minimum_increment);
 206 }
 207
 208 static gboolean
 209 gail_adjustment_set_current_value (AtkValue             *obj,
 210                                    const GValue         *value)
 211 {
 212   if (G_VALUE_HOLDS_DOUBLE (value))
 213   {
 214     GtkAdjustment* adjustment;
 215     gdouble new_value;
 216
 217     adjustment = GAIL_ADJUSTMENT (obj)->adjustment;
 218     if (adjustment == NULL)
 219     {
 220       /* State is defunct */
 221       return FALSE;
 222     }
 223     new_value = g_value_get_double (value);
 224     gtk_adjustment_set_value (adjustment, new_value);
 225
 226     return TRUE;
 227   }
 228   else
 229     return FALSE;
 230 }