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/*
* Copyright (C) 2011 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Alejandro Piñeiro Iglesias <apinheiro@igalia.com>
*/
/**
* SECTION:nux-base_window-accessible
* @Title: NuxBaseWindowAccessible
* @short_description: Implementation of the ATK interfaces for #nux::BaseWindow
* @see_also: nux::BaseWindow
*
* Right now it is used to:
* * Expose the child of BaseWindow (the layout)
* * Window event notification (activate, deactivate, and so on)
*
* BTW: we consider that one window is active if it has directly the
* keyboard focus, or if one of his child has the keyboard focus (ie:
* the Launcher via GrabKeyboardFocus)
*
* HasKeyboardFocus is not a reliable to check that:
* see bug https://bugs.launchpad.net/nux/+bug/745049
*
* So we need to update the state of the objects using the information
* from the signals OnStartKeyboardReceiver and OnStopKeyboardReceiver
*
* #NuxBaseWindowAccessible implements the required ATK interfaces of
* nux::BaseWindow, exposing as a child the BaseWindow layout
*
*/
#include "nux-base-window-accessible.h"
#include <Nux/Area.h>
#include <Nux/Layout.h>
enum
{
ACTIVATE,
DEACTIVATE,
LAST_SIGNAL
};
static guint signals [LAST_SIGNAL] = { 0, };
/* GObject */
static void nux_base_window_accessible_class_init(NuxBaseWindowAccessibleClass* klass);
static void nux_base_window_accessible_init(NuxBaseWindowAccessible* base_window_accessible);
/* AtkObject.h */
static void nux_base_window_accessible_initialize(AtkObject* accessible,
gpointer data);
static AtkObject* nux_base_window_accessible_get_parent(AtkObject* obj);
static AtkStateSet* nux_base_window_accessible_ref_state_set(AtkObject* obj);
/* private */
static void on_change_keyboard_receiver_cb(AtkObject* accessible,
gboolean focus_in);
G_DEFINE_TYPE(NuxBaseWindowAccessible, nux_base_window_accessible, NUX_TYPE_VIEW_ACCESSIBLE)
struct _NuxBaseWindowAccessiblePrivate
{
/* Cached values (used to avoid extra notifications) */
gboolean active;
gboolean key_focused;
gboolean child_key_focused;
/* so active = key_focused || child_key_focused */
};
#define NUX_BASE_WINDOW_ACCESSIBLE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), NUX_TYPE_BASE_WINDOW_ACCESSIBLE, \
NuxBaseWindowAccessiblePrivate))
static void
nux_base_window_accessible_class_init(NuxBaseWindowAccessibleClass* klass)
{
GObjectClass* gobject_class = G_OBJECT_CLASS(klass);
AtkObjectClass* atk_class = ATK_OBJECT_CLASS(klass);
/* AtkObject */
atk_class->initialize = nux_base_window_accessible_initialize;
atk_class->get_parent = nux_base_window_accessible_get_parent;
atk_class->ref_state_set = nux_base_window_accessible_ref_state_set;
g_type_class_add_private(gobject_class, sizeof(NuxBaseWindowAccessiblePrivate));
/**
* BaseWindow::activate:
* @nux_object: the object which received the signal
*
* The ::activate signal is emitted when the window receives the key
* focus from the underlying window system.
*
* Toolkit implementation note: it is used when anyone adds a global
* event listener to "window:activate"
*/
signals [ACTIVATE] =
g_signal_new("activate",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST,
0, /* default signal handler */
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
/**
* BaseWindow::deactivate:
* @nux_object: the object which received the signal
*
* The ::deactivate signal is emitted when the window loses key
* focus from the underlying window system.
*
* Toolkit implementation note: it is used when anyone adds a global
* event listener to "window:deactivate"
*/
signals [DEACTIVATE] =
g_signal_new("deactivate",
G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST,
0, /* default signal handler */
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
nux_base_window_accessible_init(NuxBaseWindowAccessible* base_window_accessible)
{
NuxBaseWindowAccessiblePrivate* priv =
NUX_BASE_WINDOW_ACCESSIBLE_GET_PRIVATE(base_window_accessible);
base_window_accessible->priv = priv;
}
AtkObject*
nux_base_window_accessible_new(nux::Object* object)
{
AtkObject* accessible = NULL;
g_return_val_if_fail(dynamic_cast<nux::BaseWindow*>(object), NULL);
accessible = ATK_OBJECT(g_object_new(NUX_TYPE_BASE_WINDOW_ACCESSIBLE, NULL));
atk_object_initialize(accessible, object);
return accessible;
}
/* AtkObject.h */
static void
nux_base_window_accessible_initialize(AtkObject* accessible,
gpointer data)
{
nux::Object* nux_object = NULL;
nux::BaseWindow* bwindow = NULL;
ATK_OBJECT_CLASS(nux_base_window_accessible_parent_class)->initialize(accessible, data);
accessible->role = ATK_ROLE_WINDOW;
nux_object = nux_object_accessible_get_object(NUX_OBJECT_ACCESSIBLE(accessible));
bwindow = dynamic_cast<nux::BaseWindow*>(nux_object);
/* This gives us if the window has the underlying key input */
bwindow->begin_key_focus.connect(sigc::bind(sigc::ptr_fun(on_change_keyboard_receiver_cb),
accessible, TRUE));
bwindow->end_key_focus.connect(sigc::bind(sigc::ptr_fun(on_change_keyboard_receiver_cb),
accessible, FALSE));
}
static AtkObject*
nux_base_window_accessible_get_parent(AtkObject* obj)
{
return atk_get_root();
}
static AtkStateSet*
nux_base_window_accessible_ref_state_set(AtkObject* obj)
{
AtkStateSet* state_set = NULL;
NuxBaseWindowAccessible* self = NULL;
nux::Object* nux_object = NULL;
g_return_val_if_fail(NUX_IS_BASE_WINDOW_ACCESSIBLE(obj), NULL);
state_set = ATK_OBJECT_CLASS(nux_base_window_accessible_parent_class)->ref_state_set(obj);
nux_object = nux_object_accessible_get_object(NUX_OBJECT_ACCESSIBLE(obj));
if (nux_object == NULL) /* defunct */
return state_set;
self = NUX_BASE_WINDOW_ACCESSIBLE(obj);
atk_state_set_add_state(state_set, ATK_STATE_FOCUSABLE);
/* HasKeyboardFocus is not a reliable here:
see bug https://bugs.launchpad.net/nux/+bug/745049 */
if (self->priv->active)
{
atk_state_set_add_state(state_set, ATK_STATE_ACTIVE);
atk_state_set_add_state(state_set, ATK_STATE_FOCUSED);
}
return state_set;
}
/* private */
static void
check_active(NuxBaseWindowAccessible* self)
{
gint signal_id;
gboolean is_active;
is_active = (self->priv->key_focused || self->priv->child_key_focused);
if (self->priv->active != is_active)
{
self->priv->active = is_active;
if (is_active)
signal_id = ACTIVATE;
else
signal_id = DEACTIVATE;
atk_object_notify_state_change(ATK_OBJECT(self),
ATK_STATE_ACTIVE, is_active);
g_signal_emit(self, signals [signal_id], 0);
}
}
static void
on_change_keyboard_receiver_cb(AtkObject* object,
gboolean focus_in)
{
NuxBaseWindowAccessible* self = NULL;
/* On the base window, we suppose that the window is active if it
has the key focus (see nux::InputArea) */
self = NUX_BASE_WINDOW_ACCESSIBLE(object);
if (self->priv->key_focused != focus_in)
{
self->priv->key_focused = focus_in;
check_active(self);
}
}
/* public */
void
nux_base_window_set_child_key_focused(NuxBaseWindowAccessible* self,
gboolean value)
{
g_return_if_fail(NUX_IS_BASE_WINDOW_ACCESSIBLE(self));
if (self->priv->child_key_focused != value)
{
self->priv->child_key_focused = value;
check_active(self);
}
}
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