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/* GTK - The GIMP Toolkit
* Copyright 2001 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 "gtkwidget.h"
#include "gtkintl.h"
#include "gtkaccessible.h"
/**
* SECTION:gtkaccessible
* @Short_description: Accessibility support for widgets
* @Title: GtkAccessible
*
* The #GtkAccessible class is the base class for accessible
* implementations for #GtkWidget subclasses. It is a thin
* wrapper around #AtkObject, which adds facilities for associating
* a widget with its accessible object.
*
* An accessible implementation for a third-party widget should
* derive from #GtkAccessible and implement the suitable interfaces
* from ATK, such as #AtkText or #AtkSelection. To establish
* the connection between the widget class and its corresponding
* acccessible implementation, override the get_accessible vfunc
* in #GtkWidgetClass.
*/
struct _GtkAccessiblePrivate
{
GtkWidget *widget;
};
enum {
PROP_0,
PROP_WIDGET
};
G_DEFINE_TYPE_WITH_PRIVATE (GtkAccessible, gtk_accessible, ATK_TYPE_OBJECT)
static void
gtk_accessible_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkAccessible *accessible = GTK_ACCESSIBLE (object);
switch (prop_id)
{
case PROP_WIDGET:
gtk_accessible_set_widget (accessible, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_accessible_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkAccessible *accessible = GTK_ACCESSIBLE (object);
GtkAccessiblePrivate *priv = accessible->priv;
switch (prop_id)
{
case PROP_WIDGET:
g_value_set_object (value, priv->widget);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_accessible_init (GtkAccessible *accessible)
{
accessible->priv = gtk_accessible_get_instance_private (accessible);
}
static AtkStateSet *
gtk_accessible_ref_state_set (AtkObject *object)
{
GtkAccessible *accessible = GTK_ACCESSIBLE (object);
AtkStateSet *state_set;
state_set = ATK_OBJECT_CLASS (gtk_accessible_parent_class)->ref_state_set (object);
if (accessible->priv->widget == NULL)
atk_state_set_add_state (state_set, ATK_STATE_DEFUNCT);
return state_set;
}
static void
gtk_accessible_real_widget_set (GtkAccessible *accessible)
{
atk_object_notify_state_change (ATK_OBJECT (accessible), ATK_STATE_DEFUNCT, FALSE);
}
static void
gtk_accessible_real_widget_unset (GtkAccessible *accessible)
{
atk_object_notify_state_change (ATK_OBJECT (accessible), ATK_STATE_DEFUNCT, TRUE);
}
static void
gtk_accessible_dispose (GObject *object)
{
GtkAccessible *accessible = GTK_ACCESSIBLE (object);
gtk_accessible_set_widget (accessible, NULL);
G_OBJECT_CLASS (gtk_accessible_parent_class)->dispose (object);
}
static void
gtk_accessible_class_init (GtkAccessibleClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
AtkObjectClass *atkobject_class = ATK_OBJECT_CLASS (klass);
klass->widget_set = gtk_accessible_real_widget_set;
klass->widget_unset = gtk_accessible_real_widget_unset;
atkobject_class->ref_state_set = gtk_accessible_ref_state_set;
gobject_class->get_property = gtk_accessible_get_property;
gobject_class->set_property = gtk_accessible_set_property;
gobject_class->dispose = gtk_accessible_dispose;
g_object_class_install_property (gobject_class,
PROP_WIDGET,
g_param_spec_object ("widget",
P_("Widget"),
P_("The widget referenced by this accessible."),
GTK_TYPE_WIDGET,
G_PARAM_READWRITE));
}
/**
* gtk_accessible_set_widget:
* @accessible: a #GtkAccessible
* @widget: (allow-none): a #GtkWidget or %NULL to unset
*
* Sets the #GtkWidget corresponding to the #GtkAccessible.
*
* @accessible will not hold a reference to @widget.
* It is the caller’s responsibility to ensure that when @widget
* is destroyed, the widget is unset by calling this function
* again with @widget set to %NULL.
*/
void
gtk_accessible_set_widget (GtkAccessible *accessible,
GtkWidget *widget)
{
GtkAccessiblePrivate *priv;
GtkAccessibleClass *klass;
g_return_if_fail (GTK_IS_ACCESSIBLE (accessible));
priv = accessible->priv;
klass = GTK_ACCESSIBLE_GET_CLASS (accessible);
if (priv->widget == widget)
return;
if (priv->widget)
klass->widget_unset (accessible);
priv->widget = widget;
if (widget)
klass->widget_set (accessible);
g_object_notify (G_OBJECT (accessible), "widget");
}
/**
* gtk_accessible_get_widget:
* @accessible: a #GtkAccessible
*
* Gets the #GtkWidget corresponding to the #GtkAccessible.
* The returned widget does not have a reference added, so
* you do not need to unref it.
*
* Returns: (nullable) (transfer none): pointer to the #GtkWidget
* corresponding to the #GtkAccessible, or %NULL.
*/
GtkWidget*
gtk_accessible_get_widget (GtkAccessible *accessible)
{
g_return_val_if_fail (GTK_IS_ACCESSIBLE (accessible), NULL);
return accessible->priv->widget;
}
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