diff options
Diffstat (limited to 'src/plugins/platforms/windows/uiautomation/qwindowsuiaprovidercache.cpp')
-rw-r--r-- | src/plugins/platforms/windows/uiautomation/qwindowsuiaprovidercache.cpp | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaprovidercache.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiaprovidercache.cpp new file mode 100644 index 0000000000..9f0a1e126f --- /dev/null +++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaprovidercache.cpp @@ -0,0 +1,106 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the plugins 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 <QtCore/QtConfig> +#ifndef QT_NO_ACCESSIBILITY + +#include "qwindowsuiaprovidercache.h" +#include "qwindowsuiautils.h" +#include "qwindowscontext.h" + +#include <QtCore/QDebug> + +QT_BEGIN_NAMESPACE + +using namespace QWindowsUiAutomation; + + +// Private constructor +QWindowsUiaProviderCache::QWindowsUiaProviderCache() +{ +} + +// shared instance +QWindowsUiaProviderCache *QWindowsUiaProviderCache::instance() +{ + static QWindowsUiaProviderCache providerCache; + return &providerCache; +} + +// Returns the provider instance associated with the ID, or nullptr. +QWindowsUiaBaseProvider *QWindowsUiaProviderCache::providerForId(QAccessible::Id id) const +{ + return providerTable.value(id); +} + +// Inserts a provider in the cache and associates it with an accessibility ID. +void QWindowsUiaProviderCache::insert(QAccessible::Id id, QWindowsUiaBaseProvider *provider) +{ + remove(id); + if (provider) { + providerTable[id] = provider; + inverseTable[provider] = id; + // Connects the destroyed signal to our slot, to remove deleted objects from the cache. + QObject::connect(provider, &QObject::destroyed, this, &QWindowsUiaProviderCache::objectDestroyed); + } +} + +// Removes deleted provider objects from the cache. +void QWindowsUiaProviderCache::objectDestroyed(QObject *obj) +{ + // We have to use the inverse table to map the object address back to its ID, + // since at this point (called from QObject destructor), it has already been + // partially destroyed and we cannot treat it as a provider. + auto it = inverseTable.find(obj); + if (it != inverseTable.end()) { + providerTable.remove(*it); + inverseTable.remove(obj); + } +} + +// Removes a provider with a given id from the cache. +void QWindowsUiaProviderCache::remove(QAccessible::Id id) +{ + inverseTable.remove(providerTable.value(id)); + providerTable.remove(id); +} + +QT_END_NAMESPACE + +#endif // QT_NO_ACCESSIBILITY |