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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <QtGui/qtguiglobal.h>
#if QT_CONFIG(accessibility)
#include "qwindowsuiaprovidercache.h"
#include "qwindowsuiautils.h"
#include "qwindowscontext.h"
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 m_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) {
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, &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 = 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 QWindowsUiaProviderCache::remove(QAccessible::Id id)
{
m_inverseTable.remove(m_providerTable.value(id));
m_providerTable.remove(id);
}
QT_END_NAMESPACE
#endif // QT_CONFIG(accessibility)
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