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author | Michael Brasser <michael.brasser@nokia.com> | 2010-04-16 01:40:20 (GMT) |
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committer | Michael Brasser <michael.brasser@nokia.com> | 2010-04-16 01:41:23 (GMT) |
commit | 9ec14dcfa1d53b209e7a34b6163aac876771751e (patch) | |
tree | 809a88e793c1e4b0367e37976f1d02b2df2ec343 /src/declarative/qml/qdeclarativeparserstatus.cpp | |
parent | fc399f2cd81772fed179d59a6f53abe69a81083a (diff) | |
download | Qt-9ec14dcfa1d53b209e7a34b6163aac876771751e.zip Qt-9ec14dcfa1d53b209e7a34b6163aac876771751e.tar.gz Qt-9ec14dcfa1d53b209e7a34b6163aac876771751e.tar.bz2 |
Class documentation fixes for declarative.
Diffstat (limited to 'src/declarative/qml/qdeclarativeparserstatus.cpp')
-rw-r--r-- | src/declarative/qml/qdeclarativeparserstatus.cpp | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/src/declarative/qml/qdeclarativeparserstatus.cpp b/src/declarative/qml/qdeclarativeparserstatus.cpp index ec6260e..978bfb4 100644 --- a/src/declarative/qml/qdeclarativeparserstatus.cpp +++ b/src/declarative/qml/qdeclarativeparserstatus.cpp @@ -45,8 +45,36 @@ QT_BEGIN_NAMESPACE /*! \class QDeclarativeParserStatus - \since 4.7 - \brief The QDeclarativeParserStatus class provides updates on the parser state. + \since 4.7 + \brief The QDeclarativeParserStatus class provides updates on the QML parser state. + + QDeclarativeParserStatus provides a mechanism for classes instantiated by + a QDeclarativeEngine to receive notification at key points in their creation. + + This class is often used for optimization purposes, as it allows you to defer an + expensive operation until after all the properties have been set on an + object. For example, QML's \l {Text} element uses the parser status + to defer text layout until all of its properties have been set (we + don't want to layout when the \c text is assigned, and then relayout + when the \c font is assigned, and relayout again when the \c width is assigned, + and so on). + + To use QDeclarativeParserStatus, you must inherit both a QObject-derived class + and QDeclarativeParserStatus, and use the Q_INTERFACES() macro. + + \code + class MyObject : public QObject, public QDeclarativeParserStatus + { + Q_OBJECT + Q_INTERFACES(QDeclarativeParserStatus) + + public: + MyObject(QObject *parent = 0); + ... + void classBegin(); + void componentComplete(); + } + \endcode */ /*! \internal */ |