264 lines
7.3 KiB
C
264 lines
7.3 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright 2001 Sun Microsystems Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include "gtkwidget.h"
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#include "gtkintl.h"
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#include "gtkaccessible.h"
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/**
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* SECTION:gtkaccessible
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* @Short_description: Accessibility support for widgets
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* @Title: GtkAccessible
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*
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* The #GtkAccessible class is the base class for accessible
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* implementations for #GtkWidget subclasses. It is a thin
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* wrapper around #AtkObject, which adds facilities for associating
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* a widget with its accessible object.
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*
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* An accessible implementation for a third-party widget should
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* derive from #GtkAccessible and implement the suitable interfaces
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* from ATK, such as #AtkText or #AtkSelection. To establish
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* the connection between the widget class and its corresponding
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* acccessible implementation, override the get_accessible vfunc
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* in #GtkWidgetClass.
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*/
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struct _GtkAccessiblePrivate
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{
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GtkWidget *widget;
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};
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enum {
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PROP_0,
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PROP_WIDGET
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};
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static void gtk_accessible_real_connect_widget_destroyed (GtkAccessible *accessible);
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G_DEFINE_TYPE (GtkAccessible, gtk_accessible, ATK_TYPE_OBJECT)
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static void
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gtk_accessible_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkAccessible *accessible = GTK_ACCESSIBLE (object);
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switch (prop_id)
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{
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case PROP_WIDGET:
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gtk_accessible_set_widget (accessible, g_value_get_object (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_accessible_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkAccessible *accessible = GTK_ACCESSIBLE (object);
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GtkAccessiblePrivate *priv = accessible->priv;
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switch (prop_id)
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{
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case PROP_WIDGET:
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g_value_set_object (value, priv->widget);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_accessible_init (GtkAccessible *accessible)
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{
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accessible->priv = G_TYPE_INSTANCE_GET_PRIVATE (accessible,
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GTK_TYPE_ACCESSIBLE,
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GtkAccessiblePrivate);
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}
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static AtkStateSet *
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gtk_accessible_ref_state_set (AtkObject *object)
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{
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GtkAccessible *accessible = GTK_ACCESSIBLE (object);
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AtkStateSet *state_set;
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state_set = ATK_OBJECT_CLASS (gtk_accessible_parent_class)->ref_state_set (object);
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if (accessible->priv->widget == NULL)
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atk_state_set_add_state (state_set, ATK_STATE_DEFUNCT);
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return state_set;
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}
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static void
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gtk_accessible_real_widget_set (GtkAccessible *accessible)
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{
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atk_object_notify_state_change (ATK_OBJECT (accessible), ATK_STATE_DEFUNCT, FALSE);
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}
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static void
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gtk_accessible_real_widget_unset (GtkAccessible *accessible)
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{
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atk_object_notify_state_change (ATK_OBJECT (accessible), ATK_STATE_DEFUNCT, TRUE);
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}
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static void
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gtk_accessible_dispose (GObject *object)
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{
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GtkAccessible *accessible = GTK_ACCESSIBLE (object);
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gtk_accessible_set_widget (accessible, NULL);
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G_OBJECT_CLASS (gtk_accessible_parent_class)->dispose (object);
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}
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static void
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gtk_accessible_class_init (GtkAccessibleClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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AtkObjectClass *atkobject_class = ATK_OBJECT_CLASS (klass);
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klass->connect_widget_destroyed = gtk_accessible_real_connect_widget_destroyed;
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klass->widget_set = gtk_accessible_real_widget_set;
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klass->widget_unset = gtk_accessible_real_widget_unset;
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atkobject_class->ref_state_set = gtk_accessible_ref_state_set;
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gobject_class->get_property = gtk_accessible_get_property;
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gobject_class->set_property = gtk_accessible_set_property;
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gobject_class->dispose = gtk_accessible_dispose;
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g_object_class_install_property (gobject_class,
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PROP_WIDGET,
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g_param_spec_object ("widget",
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P_("Widget"),
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P_("The widget referenced by this accessible."),
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GTK_TYPE_WIDGET,
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G_PARAM_READWRITE));
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g_type_class_add_private (klass, sizeof (GtkAccessiblePrivate));
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}
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/**
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* gtk_accessible_set_widget:
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* @accessible: a #GtkAccessible
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* @widget: (allow-none): a #GtkWidget or %NULL to unset
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*
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* Sets the #GtkWidget corresponding to the #GtkAccessible.
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*
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* <note><para>@accessible will not hold a reference to @widget.
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* It is the caller's responsibility to ensure that when @widget
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* is destroyed, the widget is unset by calling this function
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* again with @widget set to %NULL.</para></note>
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* Since: 2.22
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*/
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void
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gtk_accessible_set_widget (GtkAccessible *accessible,
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GtkWidget *widget)
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{
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GtkAccessiblePrivate *priv;
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GtkAccessibleClass *klass;
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g_return_if_fail (GTK_IS_ACCESSIBLE (accessible));
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priv = accessible->priv;
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klass = GTK_ACCESSIBLE_GET_CLASS (accessible);
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if (priv->widget == widget)
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return;
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if (priv->widget)
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klass->widget_unset (accessible);
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priv->widget = widget;
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if (widget)
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klass->widget_set (accessible);
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g_object_notify (G_OBJECT (accessible), "widget");
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}
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/**
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* gtk_accessible_get_widget:
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* @accessible: a #GtkAccessible
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*
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* Gets the #GtkWidget corresponding to the #GtkAccessible.
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* The returned widget does not have a reference added, so
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* you do not need to unref it.
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*
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* Returns: (transfer none): pointer to the #GtkWidget
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* corresponding to the #GtkAccessible, or %NULL.
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*
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* Since: 2.22
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*/
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GtkWidget*
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gtk_accessible_get_widget (GtkAccessible *accessible)
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{
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g_return_val_if_fail (GTK_IS_ACCESSIBLE (accessible), NULL);
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return accessible->priv->widget;
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}
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/**
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* gtk_accessible_connect_widget_destroyed:
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* @accessible: a #GtkAccessible
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*
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* This function specifies the callback function to be called
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* when the widget corresponding to a GtkAccessible is destroyed.
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*
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* Deprecated: 3.4: Use gtk_accessible_set_widget() and its vfuncs.
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*/
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void
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gtk_accessible_connect_widget_destroyed (GtkAccessible *accessible)
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{
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GtkAccessibleClass *class;
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g_return_if_fail (GTK_IS_ACCESSIBLE (accessible));
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class = GTK_ACCESSIBLE_GET_CLASS (accessible);
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if (class->connect_widget_destroyed)
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class->connect_widget_destroyed (accessible);
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}
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static void
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gtk_accessible_widget_destroyed (GtkWidget *widget,
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GtkAccessible *accessible)
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{
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gtk_accessible_set_widget (accessible, NULL);
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}
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static void
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gtk_accessible_real_connect_widget_destroyed (GtkAccessible *accessible)
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{
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GtkAccessiblePrivate *priv = accessible->priv;
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if (priv->widget)
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g_signal_connect (priv->widget, "destroy",
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G_CALLBACK (gtk_accessible_widget_destroyed), accessible);
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}
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