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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qaccessiblecache_p.h"
#ifndef QT_NO_ACCESSIBILITY
QT_BEGIN_NAMESPACE
/*!
\class QAccessibleCache
\internal
\brief Maintains a cache of accessible interfaces.
*/
Q_GLOBAL_STATIC(QAccessibleCache, qAccessibleCache)
QAccessibleCache *QAccessibleCache::instance()
{
return qAccessibleCache;
}
/*
The ID is always in the range [INT_MAX+1, UINT_MAX].
This makes it easy on windows to reserve the positive integer range
for the index of a child and not clash with the unique ids.
*/
QAccessible::Id QAccessibleCache::acquireId() const
{
static const QAccessible::Id FirstId = QAccessible::Id(INT_MAX) + 1;
static QAccessible::Id lastUsedId = FirstId;
while (idToInterface.contains(lastUsedId)) {
// (wrap back when when we reach UINT_MAX - 1)
// -1 because on Android -1 is taken for the "View" so just avoid it completely for consistency
if (lastUsedId == UINT_MAX - 1)
lastUsedId = FirstId;
else
++lastUsedId;
}
return lastUsedId;
}
QAccessibleInterface *QAccessibleCache::interfaceForId(QAccessible::Id id) const
{
return idToInterface.value(id);
}
QAccessible::Id QAccessibleCache::insert(QObject *object, QAccessibleInterface *iface) const
{
Q_ASSERT(iface);
Q_UNUSED(object)
// object might be 0
Q_ASSERT(!objectToId.contains(object));
Q_ASSERT_X(!idToInterface.values().contains(iface), "", "Accessible interface inserted into cache twice!");
QAccessible::Id id = acquireId();
QObject *obj = iface->object();
Q_ASSERT(object == obj);
if (obj) {
objectToId.insert(obj, id);
connect(obj, &QObject::destroyed, this, &QAccessibleCache::objectDestroyed);
}
idToInterface.insert(id, iface);
return id;
}
void QAccessibleCache::objectDestroyed(QObject* obj)
{
QAccessible::Id id = objectToId.value(obj);
if (id) {
Q_ASSERT_X(idToInterface.contains(id), "", "QObject with accessible interface deleted, where interface not in cache!");
deleteInterface(id, obj);
}
}
void QAccessibleCache::deleteInterface(QAccessible::Id id, QObject *obj)
{
QAccessibleInterface *iface = idToInterface.take(id);
if (!obj)
obj = iface->object();
if (obj)
objectToId.remove(obj);
delete iface;
#ifdef Q_OS_MAC
removeCocoaElement(id);
#endif
}
QT_END_NAMESPACE
#endif
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