mutter/clutter/cally/cally-stage.c

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/* CALLY - The Clutter Accessibility Implementation Library
*
* Copyright (C) 2008 Igalia, S.L.
*
* Author: Alejandro Piñeiro Iglesias <apinheiro@igalia.com>
*
* 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.
*/
/**
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* SECTION:cally-stage
* @Title: CallyStage
* @short_description: Implementation of the ATK interfaces for a #ClutterStage
* @see_also: #ClutterStage
*
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* #CallyStage implements the required ATK interfaces for #ClutterStage
*
* Some implementation details: at this moment #CallyStage is used as
* the most similar Window object in this toolkit (ie: emitting window
* related signals), although the real purpose of #ClutterStage is
* being a canvas. Anyway, this is required for applications using
* just clutter, or directly #ClutterStage
*/
#include "config.h"
#include "cally-stage.h"
#include "cally-actor-private.h"
/* AtkObject.h */
static void cally_stage_real_initialize (AtkObject *obj,
gpointer data);
static AtkStateSet* cally_stage_ref_state_set (AtkObject *obj);
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/* AtkWindow */
static void cally_stage_window_interface_init (AtkWindowIface *iface);
/* Auxiliar */
static void cally_stage_activate_cb (ClutterStage *stage,
gpointer data);
static void cally_stage_deactivate_cb (ClutterStage *stage,
gpointer data);
struct _CallyStagePrivate
{
/* NULL means that the stage will receive the focus */
ClutterActor *key_focus;
gboolean active;
};
G_DEFINE_TYPE_WITH_CODE (CallyStage,
cally_stage,
CALLY_TYPE_GROUP,
G_ADD_PRIVATE (CallyStage)
G_IMPLEMENT_INTERFACE (ATK_TYPE_WINDOW,
cally_stage_window_interface_init));
static void
cally_stage_class_init (CallyStageClass *klass)
{
AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
/* AtkObject */
class->initialize = cally_stage_real_initialize;
class->ref_state_set = cally_stage_ref_state_set;
}
static void
cally_stage_init (CallyStage *cally_stage)
{
CallyStagePrivate *priv = cally_stage_get_instance_private (cally_stage);
cally_stage->priv = priv;
priv->active = FALSE;
}
/**
* cally_stage_new:
* @actor: a #ClutterActor
*
* Creates a new #CallyStage for the given @actor. @actor should be a
* #ClutterStage.
*
* Return value: the newly created #AtkObject
*
* Since: 1.4
*/
AtkObject*
cally_stage_new (ClutterActor *actor)
{
GObject *object = NULL;
AtkObject *accessible = NULL;
g_return_val_if_fail (CLUTTER_IS_STAGE (actor), NULL);
object = g_object_new (CALLY_TYPE_STAGE, NULL);
accessible = ATK_OBJECT (object);
atk_object_initialize (accessible, actor);
return accessible;
}
static void
cally_stage_notify_key_focus_cb (ClutterStage *stage,
GParamSpec *pspec,
CallyStage *self)
{
ClutterActor *key_focus = NULL;
AtkObject *new = NULL;
if (self->priv->active == FALSE)
return;
key_focus = clutter_stage_get_key_focus (stage);
if (key_focus != self->priv->key_focus)
{
AtkObject *old = NULL;
if (self->priv->key_focus != NULL)
{
g_object_remove_weak_pointer (G_OBJECT (self->priv->key_focus),
(gpointer *) &self->priv->key_focus);
old = clutter_actor_get_accessible (self->priv->key_focus);
}
else
old = clutter_actor_get_accessible (CLUTTER_ACTOR (stage));
atk_object_notify_state_change (old,
ATK_STATE_FOCUSED,
FALSE);
}
/* we keep notifying the focus gain without checking previous
* key-focus to avoid some missing events due timing
*/
self->priv->key_focus = key_focus;
if (key_focus != NULL)
{
/* ensure that if the key focus goes away, the field inside
* CallyStage is reset. see bug:
*
* https://bugzilla.gnome.org/show_bug.cgi?id=692706
*
* we remove the weak pointer above.
*/
g_object_add_weak_pointer (G_OBJECT (self->priv->key_focus),
(gpointer *) &self->priv->key_focus);
new = clutter_actor_get_accessible (key_focus);
}
else
new = clutter_actor_get_accessible (CLUTTER_ACTOR (stage));
atk_object_notify_state_change (new,
ATK_STATE_FOCUSED,
TRUE);
}
static void
cally_stage_real_initialize (AtkObject *obj,
gpointer data)
{
ClutterStage *stage = NULL;
g_return_if_fail (CALLY_IS_STAGE (obj));
ATK_OBJECT_CLASS (cally_stage_parent_class)->initialize (obj, data);
stage = CLUTTER_STAGE (CALLY_GET_CLUTTER_ACTOR (obj));
g_signal_connect (stage, "activate", G_CALLBACK (cally_stage_activate_cb), obj);
g_signal_connect (stage, "deactivate", G_CALLBACK (cally_stage_deactivate_cb), obj);
g_signal_connect (stage, "notify::key-focus",
G_CALLBACK (cally_stage_notify_key_focus_cb), obj);
atk_object_set_role (obj, ATK_ROLE_WINDOW);
}
static AtkStateSet*
cally_stage_ref_state_set (AtkObject *obj)
{
CallyStage *cally_stage = NULL;
AtkStateSet *state_set = NULL;
ClutterStage *stage = NULL;
g_return_val_if_fail (CALLY_IS_STAGE (obj), NULL);
cally_stage = CALLY_STAGE (obj);
state_set = ATK_OBJECT_CLASS (cally_stage_parent_class)->ref_state_set (obj);
stage = CLUTTER_STAGE (CALLY_GET_CLUTTER_ACTOR (cally_stage));
if (stage == NULL)
return state_set;
if (cally_stage->priv->active)
atk_state_set_add_state (state_set, ATK_STATE_ACTIVE);
return state_set;
}
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/* AtkWindow */
static void
cally_stage_window_interface_init (AtkWindowIface *iface)
{
/* At this moment AtkWindow is just about signals */
}
/* Auxiliar */
static void
cally_stage_activate_cb (ClutterStage *stage,
gpointer data)
{
CallyStage *cally_stage = NULL;
g_return_if_fail (CALLY_IS_STAGE (data));
cally_stage = CALLY_STAGE (data);
cally_stage->priv->active = TRUE;
atk_object_notify_state_change (ATK_OBJECT (cally_stage),
ATK_STATE_ACTIVE, TRUE);
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g_signal_emit_by_name (cally_stage, "activate", 0);
}
static void
cally_stage_deactivate_cb (ClutterStage *stage,
gpointer data)
{
CallyStage *cally_stage = NULL;
g_return_if_fail (CALLY_IS_STAGE (data));
cally_stage = CALLY_STAGE (data);
cally_stage->priv->active = FALSE;
atk_object_notify_state_change (ATK_OBJECT (cally_stage),
ATK_STATE_ACTIVE, FALSE);
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g_signal_emit_by_name (cally_stage, "deactivate", 0);
}