QPropertyAnimation Class

The QPropertyAnimation class animates Qt properties. 更多...

頭：	#include <QPropertyAnimation>
qmake:	QT += core
Since:	Qt 4.6
繼承：	QVariantAnimation

該類在 Qt 4.6 引入。

所有成員列錶，包括繼承成員

特性

propertyName : QByteArray
targetObject : QObject*

公共函數

	QPropertyAnimation (QObject * target , const QByteArray & propertyName , QObject * parent = nullptr)
	QPropertyAnimation (QObject * parent = nullptr)
virtual	~QPropertyAnimation ()
QByteArray	propertyName () const
void	setPropertyName (const QByteArray & propertyName )
void	setTargetObject (QObject * target )
QObject *	targetObject () const

重實現保護函數

virtual bool	event (QEvent * event ) override
virtual void	updateCurrentValue (const QVariant & value ) override
virtual void	updateState (QAbstractAnimation::State newState , QAbstractAnimation::State oldState ) override

詳細描述

QPropertyAnimation interpolates over Qt properties . As property values are stored in QVariant s, the class inherits QVariantAnimation , and supports animation of the same meta types as its super class.

A class declaring properties must be a QObject . To make it possible to animate a property, it must provide a setter (so that QPropertyAnimation can set the property's value). Note that this makes it possible to animate many of Qt's widgets. Let's look at an example:

    QPropertyAnimation *animation = new QPropertyAnimation(myWidget, "geometry");
    animation->setDuration(10000);
    animation->setStartValue(QRect(0, 0, 100, 30));
    animation->setEndValue(QRect(250, 250, 100, 30));
    animation->start();

The property name and the QObject instance of which property should be animated are passed to the constructor. You can then specify the start and end value of the property. The procedure is equal for properties in classes you have implemented yourself--just check with QVariantAnimation that your QVariant type is supported.

The QVariantAnimation class description explains how to set up the animation in detail. Note, however, that if a start value is not set, the property will start at the value it had when the QPropertyAnimation instance was created.

QPropertyAnimation works like a charm on its own. For complex animations that, for instance, contain several objects, QAnimationGroup is provided. An animation group is an animation that can contain other animations, and that can manage when its animations are played. Look at QParallelAnimationGroup 範例。

另請參閱 QVariantAnimation , QAnimationGroup ，和動畫框架 .

特性文檔編製

propertyName : QByteArray

This property holds the target property name for this animation

This property defines the target property name for this animation. The property name is required for the animation to operate.

訪問函數：

QByteArray	propertyName () const
void	setPropertyName (const QByteArray & propertyName )

targetObject : QObject *

This property holds the target QObject for this animation.

This property defines the target QObject for this animation.

訪問函數：

QObject *	targetObject () const
void	setTargetObject (QObject * target )

成員函數文檔編製

QPropertyAnimation:: QPropertyAnimation ( QObject * target , const QByteArray & propertyName , QObject * parent = nullptr)

Construct a QPropertyAnimation object. parent 被傳遞給 QObject 's constructor. The animation changes the property propertyName on target . The default duration is 250ms.

另請參閱 targetObject and propertyName .

QPropertyAnimation:: QPropertyAnimation ( QObject * parent = nullptr)

Construct a QPropertyAnimation object. parent 被傳遞給 QObject 的構造函數。

`[虛擬]` QPropertyAnimation:: ~QPropertyAnimation ()

銷毀 QPropertyAnimation 實例。

`[override virtual protected]` bool QPropertyAnimation:: event ( QEvent * event )

重實現： QVariantAnimation::event (QEvent *event).

`[override virtual protected]` void QPropertyAnimation:: updateCurrentValue (const QVariant & value )

重實現： QVariantAnimation::updateCurrentValue (const QVariant &value).

此虛函數被調用由 QVariantAnimation whenever the current value changes. value is the new, updated value. It updates the current value of the property on the target object.

另請參閱 currentValue and currentTime .

`[override virtual protected]` void QPropertyAnimation:: updateState ( QAbstractAnimation::State newState , QAbstractAnimation::State oldState )

重實現： QVariantAnimation::updateState (QAbstractAnimation::State newState, QAbstractAnimation::State oldState).

若 startValue is not defined when the state of the animation changes from Stopped to Running, the current property value is used as the initial value for the animation.