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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qiosplatformaccessibility.h"

#include <QtGui/QtGui>
#include "qioswindow.h"

QIOSPlatformAccessibility::QIOSPlatformAccessibility()
{}

QIOSPlatformAccessibility::~QIOSPlatformAccessibility()
{}


void invalidateCache(QAccessibleInterface *iface)
{
    if (!iface || !iface->isValid()) {
        qWarning() << "invalid accessible interface: " << iface;
        return;
    }

    // This will invalidate everything regardless of what window the
    // interface belonged to. We might want to revisit this strategy later.
    // (Therefore this function still takes the interface as argument)
    // It is also responsible for the bug that focus gets temporary lost
    // when items get added or removed from the screen
    foreach (QWindow *win, QGuiApplication::topLevelWindows()) {
        if (win && win->handle()) {
            QIOSWindow *window = static_cast<QIOSWindow*>(win->handle());
            window->clearAccessibleCache();
        }
    }
}


void QIOSPlatformAccessibility::notifyAccessibilityUpdate(QAccessibleEvent *event)
{
    switch (event->type()) {
    case QAccessible::ObjectCreated:
    case QAccessible::ObjectShow:
    case QAccessible::ObjectHide:
    case QAccessible::ObjectDestroyed:
        invalidateCache(event->accessibleInterface());
        break;
    default:
        break;
    }
}