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Diffstat (limited to 'src/declarative/qml/qdeclarativefastproperties.cpp')
-rw-r--r-- | src/declarative/qml/qdeclarativefastproperties.cpp | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/declarative/qml/qdeclarativefastproperties.cpp b/src/declarative/qml/qdeclarativefastproperties.cpp new file mode 100644 index 00000000..2c4d6223 --- /dev/null +++ b/src/declarative/qml/qdeclarativefastproperties.cpp @@ -0,0 +1,101 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "private/qdeclarativefastproperties_p.h" + +#include <private/qdeclarativeitem_p.h> + +QT_BEGIN_NAMESPACE + +// Adding entries to the QDeclarativeFastProperties class allows the QML +// binding optimizer to bypass Qt's meta system and read and, more +// importantly, subscribe to properties directly. Any property that is +// primarily read from bindings is a candidate for inclusion as a fast +// property. + +static void QObject_objectName(QObject *object, void *output, QDeclarativeNotifierEndpoint *endpoint) +{ + if (endpoint) + endpoint->connect(QDeclarativeData::get(object, true)->objectNameNotifier()); + *((QString *)output) = object->objectName(); +} + +QDeclarativeFastProperties::QDeclarativeFastProperties() +{ + add(&QDeclarativeItem::staticMetaObject, QDeclarativeItem::staticMetaObject.indexOfProperty("parent"), + QDeclarativeItemPrivate::parentProperty); + add(&QObject::staticMetaObject, QObject::staticMetaObject.indexOfProperty("objectName"), + QObject_objectName); +} + +int QDeclarativeFastProperties::accessorIndexForProperty(const QMetaObject *metaObject, int propertyIndex) +{ + Q_ASSERT(metaObject); + Q_ASSERT(propertyIndex >= 0); + + // Find the "real" metaObject + while (metaObject->propertyOffset() > propertyIndex) + metaObject = metaObject->superClass(); + + QHash<QPair<const QMetaObject *, int>, int>::Iterator iter = + m_index.find(qMakePair(metaObject, propertyIndex)); + if (iter != m_index.end()) + return *iter; + else + return -1; +} + +void QDeclarativeFastProperties::add(const QMetaObject *metaObject, int propertyIndex, Accessor accessor) +{ + Q_ASSERT(metaObject); + Q_ASSERT(propertyIndex >= 0); + + // Find the "real" metaObject + while (metaObject->propertyOffset() > propertyIndex) + metaObject = metaObject->superClass(); + + QPair<const QMetaObject *, int> data = qMakePair(metaObject, propertyIndex); + int accessorIndex = m_accessors.count(); + m_accessors.append(accessor); + m_index.insert(data, accessorIndex); +} + +QT_END_NAMESPACE |