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gtk/modules/other/gail/gailcombobox.c
Li Yuan 5d617ee80b Emit property-changed:accessible-name for gailcombobox 
Fix bug #579741. Emit property-changed:accessible-name when selection
of combobox changed.
2009-05-04 11:38:44 +08:00

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/* GAIL - The GNOME Accessibility Implementation Library
* Copyright 2004 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "gailcombobox.h"
static void gail_combo_box_class_init (GailComboBoxClass *klass);
static void gail_combo_box_init (GailComboBox *combo_box);
static void gail_combo_box_real_initialize (AtkObject *obj,
gpointer data);
static void gail_combo_box_changed_gtk (GtkWidget *widget);
static G_CONST_RETURN gchar* gail_combo_box_get_name (AtkObject *obj);
static gint gail_combo_box_get_n_children (AtkObject *obj);
static AtkObject* gail_combo_box_ref_child (AtkObject *obj,
gint i);
static void gail_combo_box_finalize (GObject *object);
static void atk_action_interface_init (AtkActionIface *iface);
static gboolean gail_combo_box_do_action (AtkAction *action,
gint i);
static gboolean idle_do_action (gpointer data);
static gint gail_combo_box_get_n_actions (AtkAction *action);
static G_CONST_RETURN gchar* gail_combo_box_get_description(AtkAction *action,
gint i);
static G_CONST_RETURN gchar* gail_combo_box_get_keybinding (AtkAction *action,
gint i);
static G_CONST_RETURN gchar* gail_combo_box_action_get_name(AtkAction *action,
gint i);
static gboolean gail_combo_box_set_description(AtkAction *action,
gint i,
const gchar *desc);
static void atk_selection_interface_init (AtkSelectionIface *iface);
static gboolean gail_combo_box_add_selection (AtkSelection *selection,
gint i);
static gboolean gail_combo_box_clear_selection (AtkSelection *selection);
static AtkObject* gail_combo_box_ref_selection (AtkSelection *selection,
gint i);
static gint gail_combo_box_get_selection_count (AtkSelection *selection);
static gboolean gail_combo_box_is_child_selected (AtkSelection *selection,
gint i);
static gboolean gail_combo_box_remove_selection (AtkSelection *selection,
gint i);
G_DEFINE_TYPE_WITH_CODE (GailComboBox, gail_combo_box, GAIL_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (ATK_TYPE_ACTION, atk_action_interface_init)
G_IMPLEMENT_INTERFACE (ATK_TYPE_SELECTION, atk_selection_interface_init))
static void
gail_combo_box_class_init (GailComboBoxClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
gobject_class->finalize = gail_combo_box_finalize;
class->get_name = gail_combo_box_get_name;
class->get_n_children = gail_combo_box_get_n_children;
class->ref_child = gail_combo_box_ref_child;
class->initialize = gail_combo_box_real_initialize;
}
static void
gail_combo_box_init (GailComboBox *combo_box)
{
combo_box->press_description = NULL;
combo_box->press_keybinding = NULL;
combo_box->old_selection = -1;
combo_box->name = NULL;
combo_box->popup_set = FALSE;
}
static void
gail_combo_box_real_initialize (AtkObject *obj,
gpointer data)
{
GtkComboBox *combo_box;
GailComboBox *gail_combo_box;
AtkObject *popup;
ATK_OBJECT_CLASS (gail_combo_box_parent_class)->initialize (obj, data);
combo_box = GTK_COMBO_BOX (data);
gail_combo_box = GAIL_COMBO_BOX (obj);
g_signal_connect (combo_box,
"changed",
G_CALLBACK (gail_combo_box_changed_gtk),
NULL);
gail_combo_box->old_selection = gtk_combo_box_get_active (combo_box);
popup = gtk_combo_box_get_popup_accessible (combo_box);
if (popup)
{
atk_object_set_parent (popup, obj);
gail_combo_box->popup_set = TRUE;
}
if (GTK_IS_COMBO_BOX_ENTRY (combo_box))
atk_object_set_parent (gtk_widget_get_accessible (gtk_bin_get_child (GTK_BIN (combo_box))), obj);
obj->role = ATK_ROLE_COMBO_BOX;
}
static void
gail_combo_box_changed_gtk (GtkWidget *widget)
{
GtkComboBox *combo_box;
AtkObject *obj;
GailComboBox *gail_combo_box;
gint index;
combo_box = GTK_COMBO_BOX (widget);
index = gtk_combo_box_get_active (combo_box);
obj = gtk_widget_get_accessible (widget);
gail_combo_box = GAIL_COMBO_BOX (obj);
if (gail_combo_box->old_selection != index)
{
gail_combo_box->old_selection = index;
g_object_notify (G_OBJECT (obj), "accessible-name");
g_signal_emit_by_name (obj, "selection_changed");
}
}
static G_CONST_RETURN gchar*
gail_combo_box_get_name (AtkObject *obj)
{
GtkWidget *widget;
GtkComboBox *combo_box;
GailComboBox *gail_combo_box;
GtkTreeIter iter;
G_CONST_RETURN gchar *name;
GtkTreeModel *model;
gint n_columns;
gint i;
g_return_val_if_fail (GAIL_IS_COMBO_BOX (obj), NULL);
name = ATK_OBJECT_CLASS (gail_combo_box_parent_class)->get_name (obj);
if (name)
return name;
widget = GTK_ACCESSIBLE (obj)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return NULL;
combo_box = GTK_COMBO_BOX (widget);
gail_combo_box = GAIL_COMBO_BOX (obj);
if (gtk_combo_box_get_active_iter (combo_box, &iter))
{
model = gtk_combo_box_get_model (combo_box);
n_columns = gtk_tree_model_get_n_columns (model);
for (i = 0; i < n_columns; i++)
{
GValue value = { 0, };
gtk_tree_model_get_value (model, &iter, i, &value);
if (G_VALUE_HOLDS_STRING (&value))
{
if (gail_combo_box->name) g_free (gail_combo_box->name);
gail_combo_box->name = g_strdup ((gchar *)
g_value_get_string (&value));
g_value_unset (&value);
break;
}
else
g_value_unset (&value);
}
}
return gail_combo_box->name;
}
/*
* The children of a GailComboBox are the list of items and the entry field
* if it is editable.
*/
static gint
gail_combo_box_get_n_children (AtkObject* obj)
{
gint n_children = 0;
GtkWidget *widget;
g_return_val_if_fail (GAIL_IS_COMBO_BOX (obj), 0);
widget = GTK_ACCESSIBLE (obj)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return 0;
n_children++;
if (GTK_IS_COMBO_BOX_ENTRY (widget))
n_children ++;
return n_children;
}
static AtkObject*
gail_combo_box_ref_child (AtkObject *obj,
gint i)
{
GtkWidget *widget;
AtkObject *child;
GailComboBox *box;
g_return_val_if_fail (GAIL_IS_COMBO_BOX (obj), NULL);
widget = GTK_ACCESSIBLE (obj)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return NULL;
if (i == 0)
{
child = gtk_combo_box_get_popup_accessible (GTK_COMBO_BOX (widget));
box = GAIL_COMBO_BOX (obj);
if (box->popup_set == FALSE)
{
atk_object_set_parent (child, obj);
box->popup_set = TRUE;
}
}
else if (i == 1 && GTK_IS_COMBO_BOX_ENTRY (widget))
{
child = gtk_widget_get_accessible (gtk_bin_get_child (GTK_BIN (widget)));
}
else
{
return NULL;
}
return g_object_ref (child);
}
static void
atk_action_interface_init (AtkActionIface *iface)
{
iface->do_action = gail_combo_box_do_action;
iface->get_n_actions = gail_combo_box_get_n_actions;
iface->get_description = gail_combo_box_get_description;
iface->get_keybinding = gail_combo_box_get_keybinding;
iface->get_name = gail_combo_box_action_get_name;
iface->set_description = gail_combo_box_set_description;
}
static gboolean
gail_combo_box_do_action (AtkAction *action,
gint i)
{
GailComboBox *combo_box;
GtkWidget *widget;
widget = GTK_ACCESSIBLE (action)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return FALSE;
if (!GTK_WIDGET_SENSITIVE (widget) || !GTK_WIDGET_VISIBLE (widget))
return FALSE;
combo_box = GAIL_COMBO_BOX (action);
if (i == 0)
{
if (combo_box->action_idle_handler)
return FALSE;
combo_box->action_idle_handler = gdk_threads_add_idle (idle_do_action, combo_box);
return TRUE;
}
else
return FALSE;
}
static gboolean
idle_do_action (gpointer data)
{
GtkComboBox *combo_box;
GtkWidget *widget;
GailComboBox *gail_combo_box;
AtkObject *popup;
gboolean do_popup;
gail_combo_box = GAIL_COMBO_BOX (data);
gail_combo_box->action_idle_handler = 0;
widget = GTK_ACCESSIBLE (gail_combo_box)->widget;
if (widget == NULL || /* State is defunct */
!GTK_WIDGET_SENSITIVE (widget) || !GTK_WIDGET_VISIBLE (widget))
return FALSE;
combo_box = GTK_COMBO_BOX (widget);
popup = gtk_combo_box_get_popup_accessible (combo_box);
do_popup = !GTK_WIDGET_MAPPED (GTK_ACCESSIBLE (popup)->widget);
if (do_popup)
gtk_combo_box_popup (combo_box);
else
gtk_combo_box_popdown (combo_box);
return FALSE;
}
static gint
gail_combo_box_get_n_actions (AtkAction *action)
{
/*
* The default behavior of a combo_box box is to have one action -
*/
return 1;
}
static G_CONST_RETURN gchar*
gail_combo_box_get_description (AtkAction *action,
gint i)
{
if (i == 0)
{
GailComboBox *combo_box;
combo_box = GAIL_COMBO_BOX (action);
return combo_box->press_description;
}
else
return NULL;
}
static G_CONST_RETURN gchar*
gail_combo_box_get_keybinding (AtkAction *action,
gint i)
{
GailComboBox *combo_box;
gchar *return_value = NULL;
combo_box = GAIL_COMBO_BOX (action);
switch (i)
{
case 0:
{
GtkWidget *widget;
GtkWidget *label;
AtkRelationSet *set;
AtkRelation *relation;
GPtrArray *target;
gpointer target_object;
guint key_val;
combo_box = GAIL_COMBO_BOX (action);
widget = GTK_ACCESSIBLE (combo_box)->widget;
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);
if (GTK_IS_ACCESSIBLE (target_object))
{
label = GTK_ACCESSIBLE (target_object)->widget;
}
}
g_object_unref (set);
if (GTK_IS_LABEL (label))
{
key_val = gtk_label_get_mnemonic_keyval (GTK_LABEL (label));
if (key_val != GDK_VoidSymbol)
return_value = gtk_accelerator_name (key_val, GDK_MOD1_MASK);
}
g_free (combo_box->press_keybinding);
combo_box->press_keybinding = return_value;
break; }
default:
break;
}
return return_value;
}
static G_CONST_RETURN gchar*
gail_combo_box_action_get_name (AtkAction *action,
gint i)
{
if (i == 0)
return "press";
else
return NULL;
}
static gboolean
gail_combo_box_set_description (AtkAction *action,
gint i,
const gchar *desc)
{
if (i == 0)
{
GailComboBox *combo_box;
combo_box = GAIL_COMBO_BOX (action);
g_free (combo_box->press_description);
combo_box->press_description = g_strdup (desc);
return TRUE;
}
else
return FALSE;
}
static void
atk_selection_interface_init (AtkSelectionIface *iface)
{
iface->add_selection = gail_combo_box_add_selection;
iface->clear_selection = gail_combo_box_clear_selection;
iface->ref_selection = gail_combo_box_ref_selection;
iface->get_selection_count = gail_combo_box_get_selection_count;
iface->is_child_selected = gail_combo_box_is_child_selected;
iface->remove_selection = gail_combo_box_remove_selection;
/*
* select_all_selection does not make sense for a combo_box
* so no implementation is provided.
*/
}
static gboolean
gail_combo_box_add_selection (AtkSelection *selection,
gint i)
{
GtkComboBox *combo_box;
GtkWidget *widget;
widget = GTK_ACCESSIBLE (selection)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return FALSE;
combo_box = GTK_COMBO_BOX (widget);
gtk_combo_box_set_active (combo_box, i);
return TRUE;
}
static gboolean
gail_combo_box_clear_selection (AtkSelection *selection)
{
GtkComboBox *combo_box;
GtkWidget *widget;
widget = GTK_ACCESSIBLE (selection)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return FALSE;
combo_box = GTK_COMBO_BOX (widget);
gtk_combo_box_set_active (combo_box, -1);
return TRUE;
}
static AtkObject*
gail_combo_box_ref_selection (AtkSelection *selection,
gint i)
{
GtkComboBox *combo_box;
GtkWidget *widget;
AtkObject *obj;
gint index;
widget = GTK_ACCESSIBLE (selection)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return NULL;
combo_box = GTK_COMBO_BOX (widget);
/*
* A combo_box box can have only one selection.
*/
if (i != 0)
return NULL;
obj = gtk_combo_box_get_popup_accessible (combo_box);
index = gtk_combo_box_get_active (combo_box);
return atk_object_ref_accessible_child (obj, index);
}
static gint
gail_combo_box_get_selection_count (AtkSelection *selection)
{
GtkComboBox *combo_box;
GtkWidget *widget;
widget = GTK_ACCESSIBLE (selection)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return 0;
combo_box = GTK_COMBO_BOX (widget);
return (gtk_combo_box_get_active (combo_box) == -1) ? 0 : 1;
}
static gboolean
gail_combo_box_is_child_selected (AtkSelection *selection,
gint i)
{
GtkComboBox *combo_box;
gint j;
GtkWidget *widget;
widget = GTK_ACCESSIBLE (selection)->widget;
if (widget == NULL)
/*
* State is defunct
*/
return FALSE;
combo_box = GTK_COMBO_BOX (widget);
j = gtk_combo_box_get_active (combo_box);
return (j == i);
}
static gboolean
gail_combo_box_remove_selection (AtkSelection *selection,
gint i)
{
if (atk_selection_is_child_selected (selection, i))
atk_selection_clear_selection (selection);
return TRUE;
}
static void
gail_combo_box_finalize (GObject *object)
{
GailComboBox *combo_box = GAIL_COMBO_BOX (object);
g_free (combo_box->press_description);
g_free (combo_box->press_keybinding);
g_free (combo_box->name);
if (combo_box->action_idle_handler)
{
g_source_remove (combo_box->action_idle_handler);
combo_box->action_idle_handler = 0;
}
G_OBJECT_CLASS (gail_combo_box_parent_class)->finalize (object);
}
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