1 files changed, 99 insertions, 0 deletions
diff --git a/src/plugins/platforms/winrt/uiautomation/qwinrtuiaprovidercache.cpp b/src/plugins/platforms/winrt/uiautomation/qwinrtuiaprovidercache.cpp
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+++ b/src/plugins/platforms/winrt/uiautomation/qwinrtuiaprovidercache.cpp
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 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 <QtGui/qtguiglobal.h>
+#if QT_CONFIG(accessibility)
+
+#include "qwinrtuiaprovidercache.h"
+
+QT_BEGIN_NAMESPACE
+
+// Private constructor
+QWinRTUiaProviderCache::QWinRTUiaProviderCache()
+{
+}
+
+// shared instance
+QWinRTUiaProviderCache *QWinRTUiaProviderCache::instance()
+{
+    static QWinRTUiaProviderCache providerCache;
+    return &providerCache;
+}
+
+// Returns the provider instance associated with the ID, or nullptr.
+QWinRTUiaBaseProvider *QWinRTUiaProviderCache::providerForId(QAccessible::Id id) const
+{
+    return m_providerTable.value(id);
+}
+
+// Inserts a provider in the cache and associates it with an accessibility ID.
+void QWinRTUiaProviderCache::insert(QAccessible::Id id, QWinRTUiaBaseProvider *provider)
+{
+    remove(id);
+    if (provider) {
+        m_providerTable[id] = provider;
+        m_inverseTable[provider] = id;
+        // Connects the destroyed signal to our slot, to remove deleted objects from the cache.
+        QObject::connect(provider, &QObject::destroyed, this, &QWinRTUiaProviderCache::objectDestroyed);
+    }
+}
+
+// Removes deleted provider objects from the cache.
+void QWinRTUiaProviderCache::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 = m_inverseTable.find(obj);
+    if (it != m_inverseTable.end()) {
+        m_providerTable.remove(*it);
+        m_inverseTable.remove(obj);
+    }
+}
+
+// Removes a provider with a given id from the cache.
+void QWinRTUiaProviderCache::remove(QAccessible::Id id)
+{
+    m_inverseTable.remove(m_providerTable.value(id));
+    m_providerTable.remove(id);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(accessibility)