qqmlparserstatus.cpp

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/****************************************************************************

** Contact: https://www.qt.io/licensing/

** This file is part of the QtQml module of the Qt Toolkit.

** $QT_BEGIN_LICENSE:LGPL$

** Commercial License Usage

** Licensees holding valid commercial Qt licenses may use this file in

** accordance with the commercial license agreement provided with the

** Software or, alternatively, in accordance with the terms contained in

** a written agreement between you and The Qt Company. For licensing terms

** and conditions see https://www.qt.io/terms-conditions. For further

** information use the contact form at https://www.qt.io/contact-us.

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 3 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL3 included in the

** packaging of this file. Please review the following information to

** ensure the GNU Lesser General Public License version 3 requirements

** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.

** GNU General Public License Usage

** Alternatively, this file may be used under the terms of the GNU

** General Public License version 2.0 or (at your option) the GNU General

** Public license version 3 or any later version approved by the KDE Free

** Qt Foundation. The licenses are as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3

** included in the packaging of this file. Please review the following

** information to ensure the GNU General Public License requirements will

** be met: https://www.gnu.org/licenses/gpl-2.0.html and

** https://www.gnu.org/licenses/gpl-3.0.html.

** $QT_END_LICENSE$

****************************************************************************/

#include "qqmlparserstatus.h"

QT_BEGIN_NAMESPACE

/*!

\class QQmlParserStatus

\since 5.0

\inmodule QtQml

\brief The QQmlParserStatus class provides updates on the QML parser state.

QQmlParserStatus provides a mechanism for classes instantiated by

a QQmlEngine 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).

Be aware that QQmlParserStatus methods are only called when a class is instantiated

by a QQmlEngine. If you create the same class directly from C++, these methods will

not be called automatically. To avoid this problem, it is recommended that you start

deferring operations from classBegin instead of from the initial creation of your class.

This will still prevent multiple revaluations during initial binding assignment in QML,

but will not defer operations invoked from C++.

To use QQmlParserStatus, you must inherit both a QObject-derived class

and QQmlParserStatus, and use the Q_INTERFACES() macro.

\code

class MyObject : public QObject, public QQmlParserStatus

{

Q_OBJECT

Q_INTERFACES(QQmlParserStatus)

public:

MyObject(QObject *parent = 0);

...

void classBegin();

void componentComplete();

}

\endcode

The \l {Qt Quick 1} version of this class is named QDeclarativeParserStatus.

/*! \internal */

QQmlParserStatus::QQmlParserStatus()

: d(nullptr)

{

}

executed 500020 times by 133 tests: end of block

Executed by:

tst_bindingdependencyapi
tst_drawingmodes
tst_examples
tst_flickableinterop
tst_multipointtoucharea_interop
tst_qmlcachegen
tst_qqmlapplicationengine
tst_qqmlbinding
tst_qqmlcomponent
tst_qqmlconnections
tst_qqmlconsole
tst_qqmlcontext
tst_qqmldebugjs
tst_qqmlecmascript
tst_qqmlenginedebugservice
tst_qqmlimport
tst_qqmlincubator
tst_qqmlinfo
tst_qqmlinstantiator
tst_qqmllistmodel
tst_qqmllistmodelworkerscript
tst_qqmllistreference
tst_qqmllocale
tst_qqmlmetaobject
tst_qqmlmetatype
...

500020

/*! \internal */

QQmlParserStatus::~QQmlParserStatus()

{

if(d)

Description

TRUE

evaluated 16 times by 3 tests

Evaluated by:

tst_qqmlincubator
tst_qquicklistview
tst_qquickloader

FALSE

evaluated 456424 times by 128 tests

Evaluated by:

tst_bindingdependencyapi
tst_drawingmodes
tst_examples
tst_flickableinterop
tst_multipointtoucharea_interop
tst_qmlcachegen
tst_qqmlapplicationengine
tst_qqmlbinding
tst_qqmlcomponent
tst_qqmlconnections
tst_qqmlconsole
tst_qqmlcontext
tst_qqmldebugjs
tst_qqmlecmascript
tst_qqmlenginedebugservice
tst_qqmlimport
tst_qqmlincubator
tst_qqmlinfo
tst_qqmllistmodel
tst_qqmllistmodelworkerscript
tst_qqmllistreference
tst_qqmllocale
tst_qqmlmetaobject
tst_qqmlmetatype
tst_qqmlmoduleplugin
...

16-456424

(*d) = nullptr;

executed 16 times by 3 tests: (*d) = nullptr;

Executed by:

tst_qqmlincubator
tst_qquicklistview
tst_qquickloader

}

executed 456440 times by 128 tests: end of block

Executed by:

tst_bindingdependencyapi
tst_drawingmodes
tst_examples
tst_flickableinterop
tst_multipointtoucharea_interop
tst_qmlcachegen
tst_qqmlapplicationengine
tst_qqmlbinding
tst_qqmlcomponent
tst_qqmlconnections
tst_qqmlconsole
tst_qqmlcontext
tst_qqmldebugjs
tst_qqmlecmascript
tst_qqmlenginedebugservice
tst_qqmlimport
tst_qqmlincubator
tst_qqmlinfo
tst_qqmllistmodel
tst_qqmllistmodelworkerscript
tst_qqmllistreference
tst_qqmllocale
tst_qqmlmetaobject
tst_qqmlmetatype
tst_qqmlmoduleplugin
...

456440

100

101

/*!

102

\fn void QQmlParserStatus::classBegin()

103

104

Invoked after class creation, but before any properties have been set.

/*!

\fn void QQmlParserStatus::componentComplete()

109

110

Invoked after the root component that caused this instantiation has

111

completed construction. At this point all static values and binding values

112

have been assigned to the class.

113

114

115

QT_END_NAMESPACE

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