RootContext method

[rockstar]

can any one briefly explain what will rootContext method do in QDeclaritiveView class ....

I didn't understand what was written in documentation........

[leon.anavi]

Please have look again at "QDeclarativeContext class references":http://developer.qt.nokia.com/doc/qt-4.8/qdeclarativeview.html#rootContext:

bq. QDeclarativeContext * QDeclarativeView::rootContext () const
This function returns the root of the context hierarchy. Each QML component is instantiated in a QDeclarativeContext. QDeclarativeContext's are essential for passing data to QML components. In QML, contexts are arranged hierarchically and this hierarchy is managed by the QDeclarativeEngine.

What is bothering you in this description?

[lgeyer]

... and make sure that you've followed the documentation to "QDeclarativeContext":http://doc.qt.nokia.com/4.8-snapshot/qdeclarativecontext.html and "QDeclarativeEngine":http://doc.qt.nokia.com/4.8-snapshot/qdeclarativeengine.html, which contain a brief explanation of both.

[rockstar]

bq. this function returns root of the context hierarchy....

can u briefly explain this sentence.......

[lgeyer]

Different QDeclarativeContexts are organized the same way as QObjects are - as a tree. Each QDeclarativeContext has one parent context and n child contexts. As in every tree there is exactly one root element, which has n children, but no parent.

As each QDeclarativeEngine has its own context tree each QDeclarativeEngine has its own root context element, which is automatically created and accessible through QDeclarativeEngine::rootContext(). See "The Context Hierarchy":http://doc.qt.nokia.com/4.8-snapshot/qdeclarativecontext.html#the-context-hierarchy.

A "QDeclarativeContext":http://doc.qt.nokia.com/4.8-snapshot/qdeclarativecontext.html#details is used to pass data between QML and C++.

[rockstar]

thanks Lukas........