QPropertyAnimation ¶

概要 ¶

详细描述 ¶

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.

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 范例。

另请参阅

QVariantAnimation QAnimationGroup 动画框架

class QPropertyAnimation ( [ parent=None ] ) ¶

QPropertyAnimation(target, propertyName[, parent=None])

param parent

QObject

param target

QObject

param propertyName

QByteArray

构造 QPropertyAnimation 对象。 parent 会被传递给 QObject ‘s constructor.

构造 QPropertyAnimation 对象。 parent 会被传递给 QObject ‘s constructor. The animation changes the property propertyName on target . The default duration is 250ms.

另请参阅

targetObject propertyName

PySide2.QtCore.QPropertyAnimation. propertyName ( ) ¶

返回类型

QByteArray

另请参阅

setPropertyName()

PySide2.QtCore.QPropertyAnimation. setPropertyName ( propertyName ) ¶

参数

propertyName – QByteArray

另请参阅

propertyName()

PySide2.QtCore.QPropertyAnimation. setTargetObject ( target ) ¶

参数

target – QObject

另请参阅

targetObject()

PySide2.QtCore.QPropertyAnimation. targetObject ( ) ¶

返回类型

QObject

另请参阅

setTargetObject()