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gtk2/gtk/a11y/gailmenuitem.c
Benjamin Otte bbda677728 a11y: Remove AtkText implementation from GailMenuitem 
AtkText should only be implemented by text editing widgets. For just
giving out a small text string, AtkObject::name should be used.
2011-07-05 16:08:09 -04:00

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/* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "gailmenuitem.h"
#include "gailsubmenuitem.h"
#include <libgail-util/gailmisc.h>
#define KEYBINDING_SEPARATOR ";"
static void gail_menu_item_class_init (GailMenuItemClass *klass);
static void gail_menu_item_init (GailMenuItem *menu_item);
static void gail_menu_item_real_initialize
(AtkObject *obj,
gpointer data);
static gint gail_menu_item_get_n_children (AtkObject *obj);
static AtkObject* gail_menu_item_ref_child (AtkObject *obj,
gint i);
static AtkStateSet* gail_menu_item_ref_state_set (AtkObject *obj);
static void gail_menu_item_finalize (GObject *object);
static void gail_menu_item_label_map_gtk (GtkWidget *widget,
gpointer data);
static void gail_menu_item_init_textutil (GailMenuItem *item,
GtkWidget *label);
static void gail_menu_item_notify_label_gtk (GObject *obj,
GParamSpec *pspec,
gpointer data);
static const gchar * gail_menu_item_get_name (AtkObject *object);
static void atk_action_interface_init (AtkActionIface *iface);
static gboolean gail_menu_item_do_action (AtkAction *action,
gint i);
static gboolean idle_do_action (gpointer data);
static gint gail_menu_item_get_n_actions (AtkAction *action);
static const gchar* gail_menu_item_action_get_name (AtkAction *action,
gint i);
static const gchar* gail_menu_item_get_keybinding (AtkAction *action,
gint i);
static void menu_item_select (GtkMenuItem *item);
static void menu_item_deselect (GtkMenuItem *item);
static void menu_item_selection (GtkMenuItem *item,
gboolean selected);
static gboolean find_accel (GtkAccelKey *key,
GClosure *closure,
gpointer data);
static gboolean find_accel_new (GtkAccelKey *key,
GClosure *closure,
gpointer data);
static GtkWidget* get_label_from_container (GtkWidget *container);
static gchar * get_text_from_label_widget (GtkWidget *widget);
G_DEFINE_TYPE_WITH_CODE (GailMenuItem, gail_menu_item, GAIL_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (ATK_TYPE_ACTION, atk_action_interface_init))
static void
gail_menu_item_class_init (GailMenuItemClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
gobject_class->finalize = gail_menu_item_finalize;
class->get_n_children = gail_menu_item_get_n_children;
class->ref_child = gail_menu_item_ref_child;
class->ref_state_set = gail_menu_item_ref_state_set;
class->initialize = gail_menu_item_real_initialize;
class->get_name = gail_menu_item_get_name;
}
static void
gail_menu_item_real_initialize (AtkObject *obj,
gpointer data)
{
GtkWidget *widget;
GtkWidget *parent;
GailMenuItem *item = GAIL_MENU_ITEM (obj);
GtkWidget *label;
ATK_OBJECT_CLASS (gail_menu_item_parent_class)->initialize (obj, data);
item->textutil = NULL;
item->text = NULL;
label = get_label_from_container (GTK_WIDGET (data));
if (gtk_widget_get_mapped (label))
gail_menu_item_init_textutil (item, label);
else
g_signal_connect (label,
"map",
G_CALLBACK (gail_menu_item_label_map_gtk),
item);
g_signal_connect (data,
"select",
G_CALLBACK (menu_item_select),
NULL);
g_signal_connect (data,
"deselect",
G_CALLBACK (menu_item_deselect),
NULL);
widget = GTK_WIDGET (data);
parent = gtk_widget_get_parent (widget);
if (GTK_IS_MENU (parent))
{
GtkWidget *parent_widget;
parent_widget = gtk_menu_get_attach_widget (GTK_MENU (parent));
if (!GTK_IS_MENU_ITEM (parent_widget))
parent_widget = gtk_widget_get_parent (widget);
if (parent_widget)
{
atk_object_set_parent (obj, gtk_widget_get_accessible (parent_widget));
}
}
g_object_set_data (G_OBJECT (obj), "atk-component-layer",
GINT_TO_POINTER (ATK_LAYER_POPUP));
if (GTK_IS_TEAROFF_MENU_ITEM (data))
obj->role = ATK_ROLE_TEAR_OFF_MENU_ITEM;
else if (GTK_IS_SEPARATOR_MENU_ITEM (data))
obj->role = ATK_ROLE_SEPARATOR;
else
obj->role = ATK_ROLE_MENU_ITEM;
}
static void
gail_menu_item_init (GailMenuItem *menu_item)
{
menu_item->click_keybinding = NULL;
}
static void
gail_menu_item_label_map_gtk (GtkWidget *widget,
gpointer data)
{
GailMenuItem *item;
item = GAIL_MENU_ITEM (data);
gail_menu_item_init_textutil (item, widget);
}
static void
gail_menu_item_notify_label_gtk (GObject *obj,
GParamSpec *pspec,
gpointer data)
{
AtkObject* atk_obj = ATK_OBJECT (data);
GtkLabel *label;
GailMenuItem *menu_item;
if (strcmp (pspec->name, "label") == 0)
{
const gchar* label_text;
label = GTK_LABEL (obj);
label_text = gtk_label_get_text (label);
menu_item = GAIL_MENU_ITEM (atk_obj);
gail_text_util_text_setup (menu_item->textutil, label_text);
if (atk_obj->name == NULL)
{
/*
* The label has changed so notify a change in accessible-name
*/
g_object_notify (G_OBJECT (atk_obj), "accessible-name");
}
/*
* The label is the only property which can be changed
*/
g_signal_emit_by_name (atk_obj, "visible_data_changed");
}
}
static void
gail_menu_item_init_textutil (GailMenuItem *item,
GtkWidget *label)
{
gchar *label_text;
if (item->textutil == NULL)
{
item->textutil = gail_text_util_new ();
g_signal_connect (label,
"notify",
(GCallback) gail_menu_item_notify_label_gtk,
item);
}
label_text = get_text_from_label_widget (label);
gail_text_util_text_setup (item->textutil, label_text ? label_text : "");
g_free (label_text);
}
static GtkWidget*
get_label_from_container (GtkWidget *container)
{
GtkWidget *label;
GList *children, *tmp_list;
if (!GTK_IS_CONTAINER (container))
return NULL;
children = gtk_container_get_children (GTK_CONTAINER (container));
label = NULL;
for (tmp_list = children; tmp_list != NULL; tmp_list = tmp_list->next)
{
if (GTK_IS_LABEL (tmp_list->data))
{
label = tmp_list->data;
break;
}
else if (GTK_IS_CELL_VIEW (tmp_list->data))
{
label = tmp_list->data;
break;
}
/*
* * Get label from menu item in desktop background preferences
* * option menu. See bug #144084.
* */
else if (GTK_IS_BOX (tmp_list->data))
{
label = get_label_from_container (GTK_WIDGET (tmp_list->data));
if (label)
break;
}
}
g_list_free (children);
return label;
}
static gchar *
get_text_from_label_widget (GtkWidget *label)
{
if (GTK_IS_LABEL (label))
return g_strdup (gtk_label_get_text (GTK_LABEL (label)));
else if (GTK_IS_CELL_VIEW (label))
{
GList *cells, *l;
GtkTreeModel *model;
GtkTreeIter iter;
GtkTreePath *path;
GtkCellArea *area;
gchar *text;
model = gtk_cell_view_get_model (GTK_CELL_VIEW (label));
path = gtk_cell_view_get_displayed_row (GTK_CELL_VIEW (label));
gtk_tree_model_get_iter (model, &iter, path);
gtk_tree_path_free (path);
area = gtk_cell_layout_get_area (GTK_CELL_LAYOUT (label));
gtk_cell_area_apply_attributes (area, model, &iter, FALSE, FALSE);
cells = gtk_cell_layout_get_cells (GTK_CELL_LAYOUT (label));
for (l = cells; l; l = l->next)
{
GtkCellRenderer *cell = l->data;
if (GTK_IS_CELL_RENDERER_TEXT (cell))
{
g_object_get (cell, "text", &text, NULL);
break;
}
}
g_list_free (cells);
return text;
}
return NULL;
}
AtkObject*
gail_menu_item_new (GtkWidget *widget)
{
GObject *object;
AtkObject *accessible;
g_return_val_if_fail (GTK_IS_MENU_ITEM (widget), NULL);
if (gtk_menu_item_get_submenu (GTK_MENU_ITEM (widget)))
return gail_sub_menu_item_new (widget);
object = g_object_new (GAIL_TYPE_MENU_ITEM, NULL);
accessible = ATK_OBJECT (object);
atk_object_initialize (accessible, widget);
return accessible;
}
GList *
get_children (GtkWidget *submenu)
{
GList *children;
children = gtk_container_get_children (GTK_CONTAINER (submenu));
if (g_list_length (children) == 0)
{
/*
* If menu is empty it may be because the menu items are created only
* on demand. For example, in gnome-panel the menu items are created
* only when "show" signal is emitted on the menu.
*
* The following hack forces the menu items to be created.
*/
if (!gtk_widget_get_visible (submenu))
{
/* FIXME GTK_WIDGET_SET_FLAGS (submenu, GTK_VISIBLE); */
g_signal_emit_by_name (submenu, "show");
/* FIXME GTK_WIDGET_UNSET_FLAGS (submenu, GTK_VISIBLE); */
}
g_list_free (children);
children = gtk_container_get_children (GTK_CONTAINER (submenu));
}
return children;
}
/*
* If a menu item has a submenu return the items of the submenu as the
* accessible children; otherwise expose no accessible children.
*/
static gint
gail_menu_item_get_n_children (AtkObject* obj)
{
GtkWidget *widget;
GtkWidget *submenu;
gint count = 0;
g_return_val_if_fail (GAIL_IS_MENU_ITEM (obj), count);
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
if (widget == NULL)
return count;
submenu = gtk_menu_item_get_submenu (GTK_MENU_ITEM (widget));
if (submenu)
{
GList *children;
children = get_children (submenu);
count = g_list_length (children);
g_list_free (children);
}
return count;
}
static AtkObject*
gail_menu_item_ref_child (AtkObject *obj,
gint i)
{
AtkObject *accessible;
GtkWidget *widget;
GtkWidget *submenu;
g_return_val_if_fail (GAIL_IS_MENU_ITEM (obj), NULL);
g_return_val_if_fail ((i >= 0), NULL);
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
if (widget == NULL)
return NULL;
submenu = gtk_menu_item_get_submenu (GTK_MENU_ITEM (widget));
if (submenu)
{
GList *children;
GList *tmp_list;
children = get_children (submenu);
tmp_list = g_list_nth (children, i);
if (!tmp_list)
{
g_list_free (children);
return NULL;
}
accessible = gtk_widget_get_accessible (GTK_WIDGET (tmp_list->data));
g_list_free (children);
g_object_ref (accessible);
}
else
accessible = NULL;
return accessible;
}
static AtkStateSet*
gail_menu_item_ref_state_set (AtkObject *obj)
{
AtkObject *menu_item;
AtkStateSet *state_set, *parent_state_set;
state_set = ATK_OBJECT_CLASS (gail_menu_item_parent_class)->ref_state_set (obj);
menu_item = atk_object_get_parent (obj);
if (menu_item)
{
if (!GTK_IS_MENU_ITEM (gtk_accessible_get_widget (GTK_ACCESSIBLE (menu_item))))
return state_set;
parent_state_set = atk_object_ref_state_set (menu_item);
if (!atk_state_set_contains_state (parent_state_set, ATK_STATE_SELECTED))
{
atk_state_set_remove_state (state_set, ATK_STATE_FOCUSED);
atk_state_set_remove_state (state_set, ATK_STATE_SHOWING);
}
}
return state_set;
}
static void
atk_action_interface_init (AtkActionIface *iface)
{
iface->do_action = gail_menu_item_do_action;
iface->get_n_actions = gail_menu_item_get_n_actions;
iface->get_name = gail_menu_item_action_get_name;
iface->get_keybinding = gail_menu_item_get_keybinding;
}
static gboolean
gail_menu_item_do_action (AtkAction *action,
gint i)
{
if (i == 0)
{
GtkWidget *item;
GailMenuItem *gail_menu_item;
item = gtk_accessible_get_widget (GTK_ACCESSIBLE (action));
if (item == NULL)
/* State is defunct */
return FALSE;
if (!gtk_widget_get_sensitive (item) || !gtk_widget_get_visible (item))
return FALSE;
gail_menu_item = GAIL_MENU_ITEM (action);
if (gail_menu_item->action_idle_handler)
return FALSE;
else
{
gail_menu_item->action_idle_handler =
gdk_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
idle_do_action,
g_object_ref (gail_menu_item),
(GDestroyNotify) g_object_unref);
}
return TRUE;
}
else
return FALSE;
}
static void
ensure_menus_unposted (GailMenuItem *menu_item)
{
AtkObject *parent;
GtkWidget *widget;
parent = atk_object_get_parent (ATK_OBJECT (menu_item));
while (parent)
{
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (parent));
if (GTK_IS_MENU (widget))
{
if (gtk_widget_get_mapped (widget))
gtk_menu_shell_cancel (GTK_MENU_SHELL (widget));
return;
}
parent = atk_object_get_parent (parent);
}
}
static gboolean
idle_do_action (gpointer data)
{
GtkWidget *item;
GtkWidget *item_parent;
GailMenuItem *menu_item;
gboolean item_mapped;
menu_item = GAIL_MENU_ITEM (data);
menu_item->action_idle_handler = 0;
item = gtk_accessible_get_widget (GTK_ACCESSIBLE (menu_item));
if (item == NULL /* State is defunct */ ||
!gtk_widget_get_sensitive (item) || !gtk_widget_get_visible (item))
return FALSE;
item_parent = gtk_widget_get_parent (item);
gtk_menu_shell_select_item (GTK_MENU_SHELL (item_parent), item);
item_mapped = gtk_widget_get_mapped (item);
/*
* This is what is called when <Return> is pressed for a menu item
*/
g_signal_emit_by_name (item_parent, "activate_current",
/*force_hide*/ 1);
if (!item_mapped)
ensure_menus_unposted (menu_item);
return FALSE;
}
static gint
gail_menu_item_get_n_actions (AtkAction *action)
{
/*
* Menu item has 1 action
*/
return 1;
}
static const gchar*
gail_menu_item_action_get_name (AtkAction *action,
gint i)
{
if (i == 0)
return "click";
else
return NULL;
}
static const gchar*
gail_menu_item_get_keybinding (AtkAction *action,
gint i)
{
/*
* This function returns a string of the form A;B;C where
* A is the keybinding for the widget; B is the keybinding to traverse
* from the menubar and C is the accelerator.
* The items in the keybinding to traverse from the menubar are separated
* by ":".
*/
GailMenuItem *gail_menu_item;
gchar *keybinding = NULL;
gchar *item_keybinding = NULL;
gchar *full_keybinding = NULL;
gchar *accelerator = NULL;
gail_menu_item = GAIL_MENU_ITEM (action);
if (i == 0)
{
GtkWidget *item;
GtkWidget *temp_item;
GtkWidget *child;
GtkWidget *parent;
item = gtk_accessible_get_widget (GTK_ACCESSIBLE (action));
if (item == NULL)
/* State is defunct */
return NULL;
temp_item = item;
while (TRUE)
{
GdkModifierType mnemonic_modifier = 0;
guint key_val;
gchar *key, *temp_keybinding;
child = gtk_bin_get_child (GTK_BIN (temp_item));
if (child == NULL)
{
/* Possibly a tear off menu item; it could also be a menu
* separator generated by gtk_item_factory_create_items()
*/
return NULL;
}
parent = gtk_widget_get_parent (temp_item);
if (!parent)
{
/*
* parent can be NULL when activating a window from the panel
*/
return NULL;
}
g_return_val_if_fail (GTK_IS_MENU_SHELL (parent), NULL);
if (GTK_IS_MENU_BAR (parent))
{
GtkWidget *toplevel;
toplevel = gtk_widget_get_toplevel (parent);
if (toplevel && GTK_IS_WINDOW (toplevel))
mnemonic_modifier = gtk_window_get_mnemonic_modifier (
GTK_WINDOW (toplevel));
}
if (GTK_IS_LABEL (child))
{
key_val = gtk_label_get_mnemonic_keyval (GTK_LABEL (child));
if (key_val != GDK_KEY_VoidSymbol)
{
key = gtk_accelerator_name (key_val, mnemonic_modifier);
if (full_keybinding)
temp_keybinding = g_strconcat (key, ":", full_keybinding, NULL);
else
temp_keybinding = g_strconcat (key, NULL);
if (temp_item == item)
{
item_keybinding = g_strdup (key);
}
g_free (key);
g_free (full_keybinding);
full_keybinding = temp_keybinding;
}
else
{
/* No keybinding */
g_free (full_keybinding);
full_keybinding = NULL;
break;
}
}
if (GTK_IS_MENU_BAR (parent))
/* We have reached the menu bar so we are finished */
break;
g_return_val_if_fail (GTK_IS_MENU (parent), NULL);
temp_item = gtk_menu_get_attach_widget (GTK_MENU (parent));
if (!GTK_IS_MENU_ITEM (temp_item))
{
/*
* Menu is attached to something other than a menu item;
* probably an option menu
*/
g_free (full_keybinding);
full_keybinding = NULL;
break;
}
}
parent = gtk_widget_get_parent (item);
if (GTK_IS_MENU (parent))
{
GtkAccelGroup *group;
GtkAccelKey *key;
group = gtk_menu_get_accel_group (GTK_MENU (parent));
if (group)
{
key = gtk_accel_group_find (group, find_accel, item);
}
else
{
/*
* If the menu item is created using GtkAction and GtkUIManager
* we get here.
*/
key = NULL;
child = gtk_bin_get_child (GTK_BIN (item));
if (GTK_IS_ACCEL_LABEL (child))
{
GtkAccelLabel *accel_label;
GClosure *accel_closure;
accel_label = GTK_ACCEL_LABEL (child);
g_object_get (accel_label,
"accel-closure", &accel_closure,
NULL);
if (accel_closure)
{
key = gtk_accel_group_find (gtk_accel_group_from_accel_closure (accel_closure),
find_accel_new,
accel_closure);
}
}
}
if (key)
{
accelerator = gtk_accelerator_name (key->accel_key,
key->accel_mods);
}
}
}
/*
* Concatenate the bindings
*/
if (item_keybinding || full_keybinding || accelerator)
{
gchar *temp;
if (item_keybinding)
{
keybinding = g_strconcat (item_keybinding, KEYBINDING_SEPARATOR, NULL);
g_free (item_keybinding);
}
else
keybinding = g_strconcat (KEYBINDING_SEPARATOR, NULL);
if (full_keybinding)
{
temp = g_strconcat (keybinding, full_keybinding,
KEYBINDING_SEPARATOR, NULL);
g_free (full_keybinding);
}
else
temp = g_strconcat (keybinding, KEYBINDING_SEPARATOR, NULL);
g_free (keybinding);
keybinding = temp;
if (accelerator)
{
temp = g_strconcat (keybinding, accelerator, NULL);
g_free (accelerator);
g_free (keybinding);
keybinding = temp;
}
}
g_free (gail_menu_item->click_keybinding);
gail_menu_item->click_keybinding = keybinding;
return keybinding;
}
static void
gail_menu_item_finalize (GObject *object)
{
GailMenuItem *menu_item = GAIL_MENU_ITEM (object);
g_free (menu_item->click_keybinding);
if (menu_item->action_idle_handler)
{
g_source_remove (menu_item->action_idle_handler);
menu_item->action_idle_handler = 0;
}
if (menu_item->textutil)
{
g_object_unref (menu_item->textutil);
}
if (menu_item->text)
{
g_free (menu_item->text);
menu_item->text = NULL;
}
G_OBJECT_CLASS (gail_menu_item_parent_class)->finalize (object);
}
static const gchar *
gail_menu_item_get_name (AtkObject *obj)
{
const gchar* name;
GtkWidget *widget;
GtkWidget *label;
name = ATK_OBJECT_CLASS (gail_menu_item_parent_class)->get_name (obj);
if (name)
return name;
widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
if (widget == NULL)
return NULL;
label = get_label_from_container (widget);
if (GTK_IS_LABEL (label))
return gtk_label_get_text (GTK_LABEL(label));
return NULL;
}
static void
menu_item_select (GtkMenuItem *item)
{
menu_item_selection (item, TRUE);
}
static void
menu_item_deselect (GtkMenuItem *item)
{
menu_item_selection (item, FALSE);
}
static void
menu_item_selection (GtkMenuItem *item,
gboolean selected)
{
AtkObject *obj, *parent;
gint i;
obj = gtk_widget_get_accessible (GTK_WIDGET (item));
atk_object_notify_state_change (obj, ATK_STATE_SELECTED, selected);
for (i = 0; i < atk_object_get_n_accessible_children (obj); i++)
{
AtkObject *child;
child = atk_object_ref_accessible_child (obj, i);
atk_object_notify_state_change (child, ATK_STATE_SHOWING, selected);
g_object_unref (child);
}
parent = atk_object_get_parent (obj);
g_signal_emit_by_name (parent, "selection_changed");
}
static gboolean
find_accel (GtkAccelKey *key,
GClosure *closure,
gpointer data)
{
/*
* We assume that closure->data points to the widget
* pending gtk_widget_get_accel_closures being made public
*/
return data == (gpointer) closure->data;
}
static gboolean
find_accel_new (GtkAccelKey *key,
GClosure *closure,
gpointer data)
{
return data == (gpointer) closure;
}
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