gtk2/gtk/a11y/gtkrangeaccessible.c
2012-02-27 17:06:11 +00:00

316 lines
8.9 KiB
C

/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2001, 2002, 2003 Sun Microsystems Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "gtkrangeaccessible.h"
static void atk_action_interface_init (AtkActionIface *iface);
static void atk_value_interface_init (AtkValueIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkRangeAccessible, _gtk_range_accessible, GTK_TYPE_WIDGET_ACCESSIBLE,
G_IMPLEMENT_INTERFACE (ATK_TYPE_ACTION, atk_action_interface_init)
G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
static void
gtk_range_accessible_value_changed (GtkAdjustment *adjustment,
gpointer data)
{
g_object_notify (G_OBJECT (data), "accessible-value");
}
static void
gtk_range_accessible_initialize (AtkObject *obj,
gpointer data)
{
GtkRangeAccessible *range = GTK_RANGE_ACCESSIBLE (obj);
GtkAdjustment *adj;
GtkRange *gtk_range;
ATK_OBJECT_CLASS (_gtk_range_accessible_parent_class)->initialize (obj, data);
gtk_range = GTK_RANGE (data);
/*
* If a GtkAdjustment already exists for the GtkRange,
* create the GailAdjustment
*/
adj = gtk_range_get_adjustment (gtk_range);
if (adj)
g_signal_connect (adj, "value-changed",
G_CALLBACK (gtk_range_accessible_value_changed),
range);
obj->role = ATK_ROLE_SLIDER;
}
static void
gtk_range_accessible_finalize (GObject *object)
{
GtkRangeAccessible *range = GTK_RANGE_ACCESSIBLE (object);
GtkWidget *widget;
GtkAdjustment *adj;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (object));
if (widget)
{
adj = gtk_range_get_adjustment (GTK_RANGE (widget));
if (adj)
g_signal_handlers_disconnect_by_func (adj,
gtk_range_accessible_value_changed,
range);
}
G_OBJECT_CLASS (_gtk_range_accessible_parent_class)->finalize (object);
}
static void
gtk_range_accessible_notify_gtk (GObject *obj,
GParamSpec *pspec)
{
GtkWidget *widget = GTK_WIDGET (obj);
GtkAdjustment *adj;
AtkObject *range;
if (strcmp (pspec->name, "adjustment") == 0)
{
range = gtk_widget_get_accessible (widget);
adj = gtk_range_get_adjustment (GTK_RANGE (widget));
g_signal_connect (adj, "value-changed",
G_CALLBACK (gtk_range_accessible_value_changed),
range);
}
else
GTK_WIDGET_ACCESSIBLE_CLASS (_gtk_range_accessible_parent_class)->notify_gtk (obj, pspec);
}
static void
_gtk_range_accessible_class_init (GtkRangeAccessibleClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
GtkWidgetAccessibleClass *widget_class = (GtkWidgetAccessibleClass*)klass;
widget_class->notify_gtk = gtk_range_accessible_notify_gtk;
class->initialize = gtk_range_accessible_initialize;
gobject_class->finalize = gtk_range_accessible_finalize;
}
static void
_gtk_range_accessible_init (GtkRangeAccessible *range)
{
}
static void
gtk_range_accessible_get_current_value (AtkValue *obj,
GValue *value)
{
GtkWidget *widget;
GtkAdjustment *adjustment;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
adjustment = gtk_range_get_adjustment (GTK_RANGE (widget));
if (adjustment == NULL)
return;
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, gtk_adjustment_get_value (adjustment));
}
static void
gtk_range_accessible_get_maximum_value (AtkValue *obj,
GValue *value)
{
GtkWidget *widget;
GtkAdjustment *adjustment;
gdouble max;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
adjustment = gtk_range_get_adjustment (GTK_RANGE (widget));
if (adjustment == NULL)
return;
max = gtk_adjustment_get_upper (adjustment)
- gtk_adjustment_get_page_size (adjustment);
if (gtk_range_get_restrict_to_fill_level (GTK_RANGE (widget)))
max = MIN (max, gtk_range_get_fill_level (GTK_RANGE (widget)));
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, max);
}
static void
gtk_range_accessible_get_minimum_value (AtkValue *obj,
GValue *value)
{
GtkWidget *widget;
GtkAdjustment *adjustment;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
adjustment = gtk_range_get_adjustment (GTK_RANGE (widget));
if (adjustment == NULL)
return;
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, gtk_adjustment_get_lower (adjustment));
}
static void
gtk_range_accessible_get_minimum_increment (AtkValue *obj,
GValue *value)
{
GtkWidget *widget;
GtkAdjustment *adjustment;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
adjustment = gtk_range_get_adjustment (GTK_RANGE (widget));
if (adjustment == NULL)
return;
memset (value, 0, sizeof (GValue));
g_value_init (value, G_TYPE_DOUBLE);
g_value_set_double (value, gtk_adjustment_get_minimum_increment (adjustment));
}
static gboolean
gtk_range_accessible_set_current_value (AtkValue *obj,
const GValue *value)
{
GtkWidget *widget;
GtkAdjustment *adjustment;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
adjustment = gtk_range_get_adjustment (GTK_RANGE (widget));
if (adjustment == NULL)
return FALSE;
gtk_adjustment_set_value (adjustment, g_value_get_double (value));
return TRUE;
}
static void
atk_value_interface_init (AtkValueIface *iface)
{
iface->get_current_value = gtk_range_accessible_get_current_value;
iface->get_maximum_value = gtk_range_accessible_get_maximum_value;
iface->get_minimum_value = gtk_range_accessible_get_minimum_value;
iface->get_minimum_increment = gtk_range_accessible_get_minimum_increment;
iface->set_current_value = gtk_range_accessible_set_current_value;
}
static gboolean
gtk_range_accessible_do_action (AtkAction *action,
gint i)
{
GtkWidget *widget;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (action));
if (widget == NULL)
return FALSE;
if (!gtk_widget_get_sensitive (widget) || !gtk_widget_get_visible (widget))
return FALSE;
if (i != 0)
return FALSE;
gtk_widget_activate (widget);
return TRUE;
}
static gint
gtk_range_accessible_get_n_actions (AtkAction *action)
{
return 1;
}
static const gchar *
gtk_range_accessible_get_keybinding (AtkAction *action,
gint i)
{
GtkRangeAccessible *range = GTK_RANGE_ACCESSIBLE (action);
GtkWidget *widget;
GtkWidget *label;
AtkRelationSet *set;
AtkRelation *relation;
GPtrArray *target;
gpointer target_object;
guint key_val;
gchar *return_value = NULL;
if (i != 0)
return NULL;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (range));
if (widget == NULL)
return NULL;
set = atk_object_ref_relation_set (ATK_OBJECT (action));
if (!set)
return NULL;
label = NULL;
relation = atk_relation_set_get_relation_by_type (set, ATK_RELATION_LABELLED_BY);
if (relation)
{
target = atk_relation_get_target (relation);
target_object = g_ptr_array_index (target, 0);
label = gtk_accessible_get_widget (GTK_ACCESSIBLE (target_object));
}
g_object_unref (set);
if (GTK_IS_LABEL (label))
{
key_val = gtk_label_get_mnemonic_keyval (GTK_LABEL (label));
if (key_val != GDK_KEY_VoidSymbol)
return_value = gtk_accelerator_name (key_val, GDK_MOD1_MASK);
}
return return_value;
}
static const gchar *
gtk_range_accessible_action_get_name (AtkAction *action,
gint i)
{
if (i != 0)
return NULL;
return "activate";
}
static void
atk_action_interface_init (AtkActionIface *iface)
{
iface->do_action = gtk_range_accessible_do_action;
iface->get_n_actions = gtk_range_accessible_get_n_actions;
iface->get_keybinding = gtk_range_accessible_get_keybinding;
iface->get_name = gtk_range_accessible_action_get_name;
}