1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the QtDeclarative module of the Qt Toolkit.
9 ** $QT_BEGIN_LICENSE:LGPL$
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16 ** GNU Lesser General Public License Usage
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40 ****************************************************************************/
42 #include "private/qdeclarativefastproperties_p.h"
44 #include <private/qdeclarativeitem_p.h>
48 // Adding entries to the QDeclarativeFastProperties class allows the QML
49 // binding optimizer to bypass Qt's meta system and read and, more
50 // importantly, subscribe to properties directly. Any property that is
51 // primarily read from bindings is a candidate for inclusion as a fast
54 static void QObject_objectName(QObject *object, void *output, QDeclarativeNotifierEndpoint *endpoint)
57 endpoint->connect(QDeclarativeData::get(object, true)->objectNameNotifier());
58 *((QString *)output) = object->objectName();
61 QDeclarativeFastProperties::QDeclarativeFastProperties()
63 add(&QDeclarativeItem::staticMetaObject, QDeclarativeItem::staticMetaObject.indexOfProperty("parent"),
64 QDeclarativeItemPrivate::parentProperty);
65 add(&QObject::staticMetaObject, QObject::staticMetaObject.indexOfProperty("objectName"),
69 int QDeclarativeFastProperties::accessorIndexForProperty(const QMetaObject *metaObject, int propertyIndex)
72 Q_ASSERT(propertyIndex >= 0);
74 // Find the "real" metaObject
75 while (metaObject->propertyOffset() > propertyIndex)
76 metaObject = metaObject->superClass();
78 QHash<QPair<const QMetaObject *, int>, int>::Iterator iter =
79 m_index.find(qMakePair(metaObject, propertyIndex));
80 if (iter != m_index.end())
86 void QDeclarativeFastProperties::add(const QMetaObject *metaObject, int propertyIndex, Accessor accessor)
89 Q_ASSERT(propertyIndex >= 0);
91 // Find the "real" metaObject
92 while (metaObject->propertyOffset() > propertyIndex)
93 metaObject = metaObject->superClass();
95 QPair<const QMetaObject *, int> data = qMakePair(metaObject, propertyIndex);
96 int accessorIndex = m_accessors.count();
97 m_accessors.append(accessor);
98 m_index.insert(data, accessorIndex);