QQmlFinalizerHook Class Reference

#include <qqmlfinalizer_p.h>

Inheritance diagram for QQmlFinalizerHook:

Collaboration diagram for QQmlFinalizerHook:

Public Member Functions
virtual	~QQmlFinalizerHook ()
virtual void	componentFinalized ()=0
	The customization point provided by this interface.

Detailed Description

QQmlFinalizerHook is an internal interface to run code after the current toplevel component has been completed. At first, this might look like QQmlParserStaus' componentComplete functionality by another name - however there is a difference. To understand it, consider the following QML file:

\qml import QtQuick Item { id: root Rectangle { id: rect Rectangle { id: innerRect } } property Item it: Item {id: myItem } } \endqml

This file will instantiate 4 (sub-)components: One for each of root, rect, innerRect and myItem. If the component gets loaded in a synchronous way, each of their componentComplete (if existent) would run directly one after another (in a non-specified order).

However, in the case of an asynchronous instantiation, e.g. via a loader, we might interrupt the (sub-)component construction partway: There can be a delay between the various componentComplete calls, and not all sub-components might have been constructed yet. QQmlFinalizerHook::componentFinalized is instead called after all asynchronously instantiated (sub-)components have been constructed. Notably, all bindings of those components have also been set up.

Note

While the engine does not use qobject_cast, tooling still relies on the interface being marked as such. Thus you should always use the Q_INTERFACES macro in classes deriving from QQmlFinalizerHook.

Definition at line 23 of file qqmlfinalizer_p.h.

Constructor & Destructor Documentation

~QQmlFinalizerHook()

QT_BEGIN_NAMESPACE QQmlFinalizerHook::~QQmlFinalizerHook ( )

virtualdefault

Member Function Documentation

componentFinalized()

void QQmlFinalizerHook::componentFinalized ( )

pure virtual

The customization point provided by this interface.

See the class description for why it is useful and how it compares to componentComplete.

See also

QQmlParserStatus::componentComplete

Implemented in QQuickTableView, QQuickAnimationController, and QQuickBehavior.

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The documentation for this class was generated from the following files:

• qtdeclarative/src/qml/qml/qqmlfinalizer_p.h
• qtdeclarative/src/qml/qml/qqmlfinalizer.cpp