Pileus Git - ~andy/gtk/blob - modules/other/gail/gailprogressbar.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 "gailprogressbar.h"
  25 #include "gailadjustment.h"
  26
  27 static void      gail_progress_bar_class_init        (GailProgressBarClass *klass);
  28 static void      gail_progress_bar_init              (GailProgressBar *bar);
  29 static void      gail_progress_bar_real_initialize   (AtkObject      *obj,
  30                                                       gpointer       data);
  31 static void      gail_progress_bar_finalize          (GObject        *object);
  32
  33
  34 static void      atk_value_interface_init            (AtkValueIface  *iface);
  35
  36
  37 static void      gail_progress_bar_real_notify_gtk   (GObject        *obj,
  38                                                       GParamSpec     *pspec);
  39
  40 static void      gail_progress_bar_get_current_value (AtkValue       *obj,
  41                                                       GValue         *value);
  42 static void      gail_progress_bar_get_maximum_value (AtkValue       *obj,
  43                                                       GValue         *value);
  44 static void      gail_progress_bar_get_minimum_value (AtkValue       *obj,
  45                                                       GValue         *value);
  46 static void      gail_progress_bar_value_changed     (GtkAdjustment  *adjustment,
  47                                                       gpointer       data);
  48
  49 G_DEFINE_TYPE_WITH_CODE (GailProgressBar, gail_progress_bar, GAIL_TYPE_WIDGET,
  50                          G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
  51
  52 static void
  53 gail_progress_bar_class_init            (GailProgressBarClass *klass)
  54 {
  55   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  56   AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
  57   GailWidgetClass *widget_class;
  58
  59   widget_class = (GailWidgetClass*)klass;
  60
  61   widget_class->notify_gtk = gail_progress_bar_real_notify_gtk;
  62
  63   class->initialize = gail_progress_bar_real_initialize;
  64
  65   gobject_class->finalize = gail_progress_bar_finalize;
  66 }
  67
  68 static void
  69 gail_progress_bar_init (GailProgressBar *bar)
  70 {
  71 }
  72
  73 static void
  74 gail_progress_bar_real_initialize (AtkObject *obj,
  75                                    gpointer  data)
  76 {
  77   GailProgressBar *progress_bar = GAIL_PROGRESS_BAR (obj);
  78   GtkProgress *gtk_progress;
  79
  80   ATK_OBJECT_CLASS (gail_progress_bar_parent_class)->initialize (obj, data);
  81
  82   gtk_progress = GTK_PROGRESS (data);
  83   /*
  84    * If a GtkAdjustment already exists for the spin_button,
  85    * create the GailAdjustment
  86    */
  87   if (gtk_progress->adjustment)
  88     {
  89       progress_bar->adjustment = gail_adjustment_new (gtk_progress->adjustment);
  90       g_signal_connect (gtk_progress->adjustment,
  91                         "value-changed",
  92                         G_CALLBACK (gail_progress_bar_value_changed),
  93                         obj);
  94     }
  95   else
  96     progress_bar->adjustment = NULL;
  97
  98   obj->role = ATK_ROLE_PROGRESS_BAR;
  99 }
 100
 101 static void
 102 atk_value_interface_init (AtkValueIface *iface)
 103 {
 104   iface->get_current_value = gail_progress_bar_get_current_value;
 105   iface->get_maximum_value = gail_progress_bar_get_maximum_value;
 106   iface->get_minimum_value = gail_progress_bar_get_minimum_value;
 107 }
 108
 109 static void
 110 gail_progress_bar_get_current_value (AtkValue   *obj,
 111                                      GValue     *value)
 112 {
 113   GailProgressBar *progress_bar;
 114
 115   g_return_if_fail (GAIL_IS_PROGRESS_BAR (obj));
 116
 117   progress_bar = GAIL_PROGRESS_BAR (obj);
 118   if (progress_bar->adjustment == NULL)
 119     /*
 120      * Adjustment has not been specified
 121      */
 122     return;
 123
 124   atk_value_get_current_value (ATK_VALUE (progress_bar->adjustment), value);
 125 }
 126
 127 static void
 128 gail_progress_bar_get_maximum_value (AtkValue   *obj,
 129                                      GValue     *value)
 130 {
 131   GailProgressBar *progress_bar;
 132
 133   g_return_if_fail (GAIL_IS_PROGRESS_BAR (obj));
 134
 135   progress_bar = GAIL_PROGRESS_BAR (obj);
 136   if (progress_bar->adjustment == NULL)
 137     /*
 138      * Adjustment has not been specified
 139      */
 140     return;
 141
 142   atk_value_get_maximum_value (ATK_VALUE (progress_bar->adjustment), value);
 143 }
 144
 145 static void
 146 gail_progress_bar_get_minimum_value (AtkValue    *obj,
 147                                      GValue      *value)
 148 {
 149   GailProgressBar *progress_bar;
 150
 151   g_return_if_fail (GAIL_IS_PROGRESS_BAR (obj));
 152
 153   progress_bar = GAIL_PROGRESS_BAR (obj);
 154   if (progress_bar->adjustment == NULL)
 155     /*
 156      * Adjustment has not been specified
 157      */
 158     return;
 159
 160   atk_value_get_minimum_value (ATK_VALUE (progress_bar->adjustment), value);
 161 }
 162
 163 static void
 164 gail_progress_bar_finalize (GObject            *object)
 165 {
 166   GailProgressBar *progress_bar = GAIL_PROGRESS_BAR (object);
 167
 168   if (progress_bar->adjustment)
 169     {
 170       g_object_unref (progress_bar->adjustment);
 171       progress_bar->adjustment = NULL;
 172     }
 173
 174   G_OBJECT_CLASS (gail_progress_bar_parent_class)->finalize (object);
 175 }
 176
 177
 178 static void
 179 gail_progress_bar_real_notify_gtk (GObject           *obj,
 180                                    GParamSpec        *pspec)
 181 {
 182   GtkWidget *widget = GTK_WIDGET (obj);
 183   GailProgressBar *progress_bar = GAIL_PROGRESS_BAR (gtk_widget_get_accessible (widget));
 184
 185   if (strcmp (pspec->name, "adjustment") == 0)
 186     {
 187       /*
 188        * Get rid of the GailAdjustment for the GtkAdjustment
 189        * which was associated with the progress_bar.
 190        */
 191       if (progress_bar->adjustment)
 192         {
 193           g_object_unref (progress_bar->adjustment);
 194           progress_bar->adjustment = NULL;
 195         }
 196       /*
 197        * Create the GailAdjustment when notify for "adjustment" property
 198        * is received
 199        */
 200       progress_bar->adjustment = gail_adjustment_new (GTK_PROGRESS (widget)->adjustment);
 201       g_signal_connect (GTK_PROGRESS (widget)->adjustment,
 202                         "value-changed",
 203                         G_CALLBACK (gail_progress_bar_value_changed),
 204                         progress_bar);
 205     }
 206   else
 207     GAIL_WIDGET_CLASS (gail_progress_bar_parent_class)->notify_gtk (obj, pspec);
 208 }
 209
 210 static void
 211 gail_progress_bar_value_changed (GtkAdjustment    *adjustment,
 212                                  gpointer         data)
 213 {
 214   GailProgressBar *progress_bar;
 215
 216   g_return_if_fail (adjustment != NULL);
 217   g_return_if_fail (data != NULL);
 218
 219   progress_bar = GAIL_PROGRESS_BAR (data);
 220
 221   g_object_notify (G_OBJECT (progress_bar), "accessible-value");
 222 }