# QVariantAnimation Class Reference
## [[QtCore](index.htm) module]
該QVariantAnimation類提供了動畫的抽象基類。[More...](#details)
繼承[QAbstractAnimation](qabstractanimation.html)。
通過繼承[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
該QVariantAnimation類提供了動畫的抽象基類。
這個類是一部分[The Animation Framework](index.htm)。它可以作為財產和物品的動畫一個基類,與共享的功能函數。
QVariantAnimation不能直接使用,因為它是一個抽象類,它有一個叫做純虛方法[updateCurrentValue](qvariantanimation.html#updateCurrentValue)( ) 。這個類在執行插值[QVariant](qvariant.html)秒,但保留使用插值到其子類。目前, Qt提供[QPropertyAnimation](qpropertyanimation.html),這動畫的Qt[properties](index.htm#qt-s-property-system)。請參閱[QPropertyAnimation](qpropertyanimation.html)類描述,如果您希望進行動畫該等物業。
然后,您可以通過調用設置該屬性開始和結束值[setStartValue](qvariantanimation.html#startValue-prop)()和[setEndValue](qvariantanimation.html#endValue-prop)( ) ,最后調用[start](qabstractanimation.html#start)()來啟動動畫。 QVariantAnimation將插在目標對象的屬性,放出[valueChanged](qvariantanimation.html#valueChanged)( ) 。反應在電流值的變化,你必須重新實現[updateCurrentValue](qvariantanimation.html#updateCurrentValue)( )虛函數。
另外,也可以在位于起始和結束值之間規定的步驟來設定值。那么插值會觸及這些點在指定的步驟。注意,開始和結束的值在0.0和1.0中定義的鍵值。
有兩種方式會影響QVariantAnimation如何插值的值。你可以通過調用設置緩動曲線[setEasingCurve](qvariantanimation.html#easingCurve-prop)( ) ,并配置持續時間通過調用[setDuration](qvariantanimation.html#duration-prop)( ) 。您可以更改的[QVariants](index.htm#qvariants)通過創建QVariantAnimation的子類,并重新實現虛擬內插[interpolated](qvariantanimation.html#interpolated)()函數。
子類QVariantAnimation可以是一個選擇,如果你有[QVariant](qvariant.html)s表示你不希望聲明為Qt的屬性。但請注意,您在大多數情況下會有所改善您的聲明[QVariant](qvariant.html)作為一個屬性。
不是所有的[QVariant](qvariant.html)類型的支持。下面是當前支持的列表[QVariant](qvariant.html)類型:
* [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)
如果您需要進行插值其它不同的類型,包括自定義類型,你必須實現插值為這些自己。要做到這一點,你可以為一個給定類型注冊一個插補功能。這個函數有3個參數:起始值,結束值和目前的進展。
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);
```
另一種選擇是重新實現[interpolated](qvariantanimation.html#interpolated)( ),它返回插補值進行插補值。
* * *
## Method Documentation
```
QVariantAnimation.__init__ (self, QObject?parent?=?None)
```
該_parent_的說法,如果不是沒有,原因_self_通過Qt的,而不是PyQt的擁有。
構建[QVariantAnimation](qvariantanimation.html)對象。_parent_被傳遞給[QAbstractAnimation](qabstractanimation.html)的構造。
```
QVariant QVariantAnimation.currentValue (self)
```
```
int QVariantAnimation.duration (self)
```
```
QEasingCurve QVariantAnimation.easingCurve (self)
```
[
```
QVariant QVariantAnimation.endValue (self)
```
```
bool QVariantAnimation.event (self, QEvent?event)
```
](qeasingcurve.html)
[從重新實現](qeasingcurve.html)[QObject.event](qobject.html#event)( ) 。
```
QVariant QVariantAnimation.interpolated (self, QVariant?from, QVariant?to, float?progress)
```
這個虛函數返回變體之間的線性插值_from_和_to_在_progress_, 0和1之間,通常的值。您可以在子類中重新實現這個功能[QVariantAnimation](qvariantanimation.html)提供自己的插值算法。
需要注意的是,為了使內插至一個工作[QEasingCurve](qeasingcurve.html)返回一個值大于0小于1 (如更小或更大[QEasingCurve.InBack](qeasingcurve.html#Type-enum)),你應該確保它能夠推斷。如果數據類型的語義不容許外推這個功能應該處理的優雅。
你應該調用[QVariantAnimation](qvariantanimation.html)如果你想讓你的類來處理已經支持Qt的類型實現此功能(見類[QVariantAnimation](qvariantanimation.html)說明支持的類型的列表) 。
**See also** [QEasingCurve](qeasingcurve.html)。
```
QVariant QVariantAnimation.keyValueAt (self, float?step)
```
返回關鍵幀值給定的_step_。給定_step_必須是范圍為0到1。如果不存在[KeyValue](qvariantanimation.html#KeyValue-typedef)為_step_,它返回一個無效的[QVariant](qvariant.html)。
**See also** [keyValues](qvariantanimation.html#keyValues)()和[setKeyValueAt](qvariantanimation.html#setKeyValueAt)( ) 。
```
list-of-tuple-of-float-QVariant QVariantAnimation.keyValues (self)
```
返回此動畫的關鍵幀。
**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)
```
創建一個關鍵幀在給定的_step_用給定的_value_。給定_step_必須是范圍為0到1。
**See also** [setKeyValues](qvariantanimation.html#setKeyValues)()和[keyValueAt](qvariantanimation.html#keyValueAt)( ) 。
```
QVariantAnimation.setKeyValues (self, list-of-tuple-of-float-QVariant?values)
```
替換當前設置關鍵幀與給定_keyValues_。的關鍵幀的步驟必須在范圍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)
```
從重新實現[QAbstractAnimation.updateCurrentTime](qabstractanimation.html#updateCurrentTime)( ) 。
```
QVariantAnimation.updateCurrentValue (self, QVariant?value)
```
這種方法是抽象的,應在任何子類中重新實現。
這個純虛函數被調用每次動畫的當前值的變化。該_value_參數是新的當前值。
**See also** [currentValue](qvariantanimation.html#currentValue-prop)。
```
QVariantAnimation.updateState (self, QAbstractAnimation.State?newState, QAbstractAnimation.State?oldState)
```
從重新實現[QAbstractAnimation.updateState](qabstractanimation.html#updateState)( ) 。
* * *
## Qt Signal Documentation
```
void valueChanged (const QVariant&)
```
這是該信號的默認超載。
[QVariantAnimation](qvariantanimation.html)發出這個信號時的當前_value_變化。
**See also** [currentValue](qvariantanimation.html#currentValue-prop),[startValue](qvariantanimation.html#startValue-prop)和[endValue](qvariantanimation.html#endValue-prop)。
- PyQt4 中文文檔
- PyQt Class Reference
- QAbstractAnimation Class Reference
- QAbstractButton Class Reference
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- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- 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