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42 #include "qqmlparserstatus.h"
47 \class QQmlParserStatus
49 \brief The QQmlParserStatus class provides updates on the QML parser state.
51 QQmlParserStatus provides a mechanism for classes instantiated by
52 a QQmlEngine to receive notification at key points in their creation.
54 This class is often used for optimization purposes, as it allows you to defer an
55 expensive operation until after all the properties have been set on an
56 object. For example, QML's \l {Text} element uses the parser status
57 to defer text layout until all of its properties have been set (we
58 don't want to layout when the \c text is assigned, and then relayout
59 when the \c font is assigned, and relayout again when the \c width is assigned,
62 To use QQmlParserStatus, you must inherit both a QObject-derived class
63 and QQmlParserStatus, and use the Q_INTERFACES() macro.
66 class MyObject : public QObject, public QQmlParserStatus
69 Q_INTERFACES(QQmlParserStatus)
72 MyObject(QObject *parent = 0);
75 void componentComplete();
81 QQmlParserStatus::QQmlParserStatus()
87 QQmlParserStatus::~QQmlParserStatus()
94 \fn void QQmlParserStatus::classBegin()
96 Invoked after class creation, but before any properties have been set.
100 \fn void QQmlParserStatus::componentComplete()
102 Invoked after the root component that caused this instantiation has
103 completed construction. At this point all static values and binding values
104 have been assigned to the class.