# QVariantAnimation Class Reference
## [[QtCore](index.htm) module]
该QVariantAnimation类提供了动画的抽象基类。[More...](#details)
继承[QAbstractAnimation](qabstractanimation.html)。
通过继承[QPropertyAnimation](qpropertyanimation.html)。
### Methods
* `__init__ (self, QObject parent = None)`
* `QVariant currentValue (self)`
* `int duration (self)`
* `QEasingCurve easingCurve (self)`
* `QVariant endValue (self)`
* `bool event (self, QEvent event)`
* `QVariant interpolated (self, QVariant from, QVariant to, float progress)`
* `QVariant keyValueAt (self, float step)`
* `list-of-tuple-of-float-QVariant keyValues (self)`
* `setDuration (self, int msecs)`
* `setEasingCurve (self, QEasingCurve easing)`
* `setEndValue (self, QVariant value)`
* `setKeyValueAt (self, float step, QVariant value)`
* `setKeyValues (self, list-of-tuple-of-float-QVariant values)`
* `setStartValue (self, QVariant value)`
* `QVariant startValue (self)`
* `updateCurrentTime (self, int)`
* `updateCurrentValue (self, QVariant value)`
* `updateState (self, QAbstractAnimation.State newState, QAbstractAnimation.State oldState)`
### Qt Signals
* `void valueChanged (const QVariant&)`
* * *
## Detailed Description
该QVariantAnimation类提供了动画的抽象基类。
这个类是一部分[The Animation Framework](index.htm)。它可以作为财产和物品的动画一个基类，与共享的功能函数。
QVariantAnimation不能直接使用，因为它是一个抽象类，它有一个叫做纯虚方法[updateCurrentValue](qvariantanimation.html#updateCurrentValue)（ ） 。这个类在执行插值[QVariant](qvariant.html)秒，但保留使用插值到其子类。目前， Qt提供[QPropertyAnimation](qpropertyanimation.html)，这动画的Qt[properties](index.htm#qt-s-property-system)。请参阅[QPropertyAnimation](qpropertyanimation.html)类描述，如果您希望进行动画该等物业。
然后，您可以通过调用设置该属性开始和结束值[setStartValue](qvariantanimation.html#startValue-prop)（）和[setEndValue](qvariantanimation.html#endValue-prop)（ ） ，最后调用[start](qabstractanimation.html#start)（）来启动动画。 QVariantAnimation将插在目标对象的属性，放出[valueChanged](qvariantanimation.html#valueChanged)（ ） 。反应在电流值的变化，你必须重新实现[updateCurrentValue](qvariantanimation.html#updateCurrentValue)（ ）虚函数。
另外，也可以在位于起始和结束值之间规定的步骤来设定值。那么插值会触及这些点在指定的步骤。注意，开始和结束的值在0.0和1.0中定义的键值。
有两种方式会影响QVariantAnimation如何插值的值。你可以通过调用设置缓动曲线[setEasingCurve](qvariantanimation.html#easingCurve-prop)（ ） ，并配置持续时间通过调用[setDuration](qvariantanimation.html#duration-prop)（ ） 。您可以更改的[QVariants](index.htm#qvariants)通过创建QVariantAnimation的子类，并重新实现虚拟内插[interpolated](qvariantanimation.html#interpolated)（）函数。
子类QVariantAnimation可以是一个选择，如果你有[QVariant](qvariant.html)s表示你不希望声明为Qt的属性。但请注意，您在大多数情况下会有所改善您的声明[QVariant](qvariant.html)作为一个属性。
不是所有的[QVariant](qvariant.html)类型的支持。下面是当前支持的列表[QVariant](qvariant.html)类型：
* [Int](qmetatype.html#Type-enum)
* [Double](qmetatype.html#Type-enum)
* [Float](qmetatype.html#Type-enum)
* [QLine](qmetatype.html#Type-enum)
* [QLineF](qmetatype.html#Type-enum)
* [QPoint](qmetatype.html#Type-enum)
* [QPointF](qmetatype.html#Type-enum)
* [QSize](qmetatype.html#Type-enum)
* [QSizeF](qmetatype.html#Type-enum)
* [QRect](qmetatype.html#Type-enum)
* [QRectF](qmetatype.html#Type-enum)
* [QColor](qmetatype.html#Type-enum)
如果您需要进行插值其它不同的类型，包括自定义类型，你必须实现插值为这些自己。要做到这一点，你可以为一个给定类型注册一个插补功能。这个函数有3个参数：起始值，结束值和目前的进展。
例如：
```
[QVariant](qvariant.html) myColorInterpolator(const [QColor](qcolor.html) &start, const [QColor](qcolor.html) &end, [qreal](index.htm#qreal-typedef) progress)
{
...
return [QColor](qcolor.html)(...);
}
...
qRegisterAnimationInterpolator<[QColor](qcolor.html)>(myColorInterpolator);
```
另一种选择是重新实现[interpolated](qvariantanimation.html#interpolated)（ ），它返回插补值进行插补值。
* * *
## Method Documentation
```
QVariantAnimation.__init__ (self, QObject parent = None)
```
该_parent_的说法，如果不是没有，原因_self_通过Qt的，而不是PyQt的拥有。
构建[QVariantAnimation](qvariantanimation.html)对象。_parent_被传递给[QAbstractAnimation](qabstractanimation.html)的构造。
```
QVariant QVariantAnimation.currentValue (self)
```
```
int QVariantAnimation.duration (self)
```
```
QEasingCurve QVariantAnimation.easingCurve (self)
```
[
```
QVariant QVariantAnimation.endValue (self)
```
```
bool QVariantAnimation.event (self, QEvent event)
```
](qeasingcurve.html)
[从重新实现](qeasingcurve.html)[QObject.event](qobject.html#event)（ ） 。
```
QVariant QVariantAnimation.interpolated (self, QVariant from, QVariant to, float progress)
```
这个虚函数返回变体之间的线性插值_from_和_to_在_progress_， 0和1之间，通常的值。您可以在子类中重新实现这个功能[QVariantAnimation](qvariantanimation.html)提供自己的插值算法。
需要注意的是，为了使内插至一个工作[QEasingCurve](qeasingcurve.html)返回一个值大于0小于1 （如更小或更大[QEasingCurve.InBack](qeasingcurve.html#Type-enum)），你应该确保它能够推断。如果数据类型的语义不容许外推这个功能应该处理的优雅。
你应该调用[QVariantAnimation](qvariantanimation.html)如果你想让你的类来处理已经支持Qt的类型实现此功能（见类[QVariantAnimation](qvariantanimation.html)说明支持的类型的列表） 。
**See also** [QEasingCurve](qeasingcurve.html)。
```
QVariant QVariantAnimation.keyValueAt (self, float step)
```
返回关键帧值给定的_step_。给定_step_必须是范围为0到1。如果不存在[KeyValue](qvariantanimation.html#KeyValue-typedef)为_step_，它返回一个无效的[QVariant](qvariant.html)。
**See also** [keyValues](qvariantanimation.html#keyValues)（）和[setKeyValueAt](qvariantanimation.html#setKeyValueAt)（ ） 。
```
list-of-tuple-of-float-QVariant QVariantAnimation.keyValues (self)
```
返回此动画的关键帧。
**See also** [keyValueAt](qvariantanimation.html#keyValueAt)（）和[setKeyValues](qvariantanimation.html#setKeyValues)（ ） 。
```
QVariantAnimation.setDuration (self, int msecs)
```
```
QVariantAnimation.setEasingCurve (self, QEasingCurve easing)
```
```
QVariantAnimation.setEndValue (self, QVariant value)
```
```
QVariantAnimation.setKeyValueAt (self, float step, QVariant value)
```
创建一个关键帧在给定的_step_用给定的_value_。给定_step_必须是范围为0到1。
**See also** [setKeyValues](qvariantanimation.html#setKeyValues)（）和[keyValueAt](qvariantanimation.html#keyValueAt)（ ） 。
```
QVariantAnimation.setKeyValues (self, list-of-tuple-of-float-QVariant values)
```
替换当前设置关键帧与给定_keyValues_。的关键帧的步骤必须在范围0到1。
**See also** [keyValues](qvariantanimation.html#keyValues)（）和[keyValueAt](qvariantanimation.html#keyValueAt)（ ） 。
```
QVariantAnimation.setStartValue (self, QVariant value)
```
```
QVariant QVariantAnimation.startValue (self)
```
```
QVariantAnimation.updateCurrentTime (self, int)
```
从重新实现[QAbstractAnimation.updateCurrentTime](qabstractanimation.html#updateCurrentTime)（ ） 。
```
QVariantAnimation.updateCurrentValue (self, QVariant value)
```
这种方法是抽象的，应在任何子类中重新实现。
这个纯虚函数被调用每次动画的当前值的变化。该_value_参数是新的当前值。
**See also** [currentValue](qvariantanimation.html#currentValue-prop)。
```
QVariantAnimation.updateState (self, QAbstractAnimation.State newState, QAbstractAnimation.State oldState)
```
从重新实现[QAbstractAnimation.updateState](qabstractanimation.html#updateState)（ ） 。
* * *
## Qt Signal Documentation
```
void valueChanged (const QVariant&)
```
这是该信号的默认超载。
[QVariantAnimation](qvariantanimation.html)发出这个信号时的当前_value_变化。
**See also** [currentValue](qvariantanimation.html#currentValue-prop)，[startValue](qvariantanimation.html#startValue-prop)和[endValue](qvariantanimation.html#endValue-prop)。
- PyQt4 中文文档
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- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference