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41
42 #include "private/qdeclarativefastproperties_p.h"
43
44 #include <private/qdeclarativeitem_p.h>
45
46 QT_BEGIN_NAMESPACE
47
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
52 // property.
53
QObject_objectName(QObject * object,void * output,QDeclarativeNotifierEndpoint * endpoint)54 static void QObject_objectName(QObject *object, void *output, QDeclarativeNotifierEndpoint *endpoint)
55 {
56 if (endpoint)
57 endpoint->connect(QDeclarativeData::get(object, true)->objectNameNotifier());
58 *((QString *)output) = object->objectName();
59 }
60
QDeclarativeFastProperties()61 QDeclarativeFastProperties::QDeclarativeFastProperties()
62 {
63 add(&QDeclarativeItem::staticMetaObject, QDeclarativeItem::staticMetaObject.indexOfProperty("parent"),
64 QDeclarativeItemPrivate::parentProperty);
65 add(&QObject::staticMetaObject, QObject::staticMetaObject.indexOfProperty("objectName"),
66 QObject_objectName);
67 }
68
accessorIndexForProperty(const QMetaObject * metaObject,int propertyIndex)69 int QDeclarativeFastProperties::accessorIndexForProperty(const QMetaObject *metaObject, int propertyIndex)
70 {
71 Q_ASSERT(metaObject);
72 Q_ASSERT(propertyIndex >= 0);
73
74 // Find the "real" metaObject
75 while (metaObject->propertyOffset() > propertyIndex)
76 metaObject = metaObject->superClass();
77
78 QHash<QPair<const QMetaObject *, int>, int>::Iterator iter =
79 m_index.find(qMakePair(metaObject, propertyIndex));
80 if (iter != m_index.end())
81 return *iter;
82 else
83 return -1;
84 }
85
add(const QMetaObject * metaObject,int propertyIndex,Accessor accessor)86 void QDeclarativeFastProperties::add(const QMetaObject *metaObject, int propertyIndex, Accessor accessor)
87 {
88 Q_ASSERT(metaObject);
89 Q_ASSERT(propertyIndex >= 0);
90
91 // Find the "real" metaObject
92 while (metaObject->propertyOffset() > propertyIndex)
93 metaObject = metaObject->superClass();
94
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);
99 }
100
101 QT_END_NAMESPACE
102