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| ** This file is part of the QtDeclarative module of the Qt Toolkit. |
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| |
| #include "qdeclarativeparserstatus.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| /*! |
| \class QDeclarativeParserStatus |
| \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 */ |
| QDeclarativeParserStatus::QDeclarativeParserStatus() |
| : d(0) |
| { |
| } |
| |
| /*! \internal */ |
| QDeclarativeParserStatus::~QDeclarativeParserStatus() |
| { |
| if(d) |
| (*d) = 0; |
| } |
| |
| /*! |
| \fn void QDeclarativeParserStatus::classBegin() |
| |
| Invoked after class creation, but before any properties have been set. |
| */ |
| |
| /*! |
| \fn void QDeclarativeParserStatus::componentComplete() |
| |
| Invoked after the root component that caused this instantiation has |
| completed construction. At this point all static values and binding values |
| have been assigned to the class. |
| */ |
| |
| QT_END_NAMESPACE |