# QDeclarativeItem Class Reference
## [[QtDeclarative](index.htm) module]
该QDeclarativeItem类提供了最基本的QML中所有可视的项目。[More...](#details)
继承[QGraphicsObject](qgraphicsobject.html)和[QDeclarativeParserStatus](qdeclarativeparserstatus.html)。
### Types
* `enum TransformOrigin { TopLeft, Top, TopRight, Left, ..., BottomRight }`
### Methods
* `__init__ (self, QDeclarativeItem parent = None)`
* `float baselineOffset (self)`
* `QRectF boundingRect (self)`
* `QRectF childrenRect (self)`
* `classBegin (self)`
* `bool clip (self)`
* `componentComplete (self)`
* `bool event (self, QEvent)`
* `geometryChanged (self, QRectF newGeometry, QRectF oldGeometry)`
* `bool hasFocus (self)`
* `bool heightValid (self)`
* `float implicitHeight (self)`
* `float implicitWidth (self)`
* `inputMethodEvent (self, QInputMethodEvent)`
* `QVariant inputMethodQuery (self, Qt.InputMethodQuery query)`
* `bool isComponentComplete (self)`
* `QVariant itemChange (self, QGraphicsItem.GraphicsItemChange, QVariant)`
* `bool keepMouseGrab (self)`
* `keyPressEvent (self, QKeyEvent event)`
* `keyReleaseEvent (self, QKeyEvent event)`
* `paint (self, QPainter, QStyleOptionGraphicsItem, QWidget)`
* `QDeclarativeItem parentItem (self)`
* `bool sceneEvent (self, QEvent)`
* `setBaselineOffset (self, float)`
* `setClip (self, bool)`
* `setHeight (self, float)`
* `setImplicitHeight (self, float)`
* `setImplicitWidth (self, float)`
* `setKeepMouseGrab (self, bool)`
* `setParentItem (self, QDeclarativeItem parent)`
* `setSmooth (self, bool)`
* `setTransformOrigin (self, TransformOrigin)`
* `setWidth (self, float)`
* `bool smooth (self)`
* `TransformOrigin transformOrigin (self)`
* `bool widthValid (self)`
* * *
## Detailed Description
该QDeclarativeItem类提供了最基本的QML中所有可视的项目。
Qt中声明的所有视觉项目都继承自QDeclarativeItem 。虽然QDeclarativeItem没有视觉外观,它定义了所有属于通用的可视化项目的属性 - 例如x和y位置,宽度和高度,[anchoring](index.htm#anchor-layout)和按键处理。
你可以继承QDeclarativeItem提供继承这些功能你自己的自定义可视项目。需要注意的是,因为它不画任何东西, QDeclarativeItem设置[QGraphicsItem.ItemHasNoContents](qgraphicsitem.html#GraphicsItemFlag-enum)标志。如果子类QDeclarativeItem创建一个可视化的项目,您将需要取消设置此标志。
* * *
## Type Documentation
```
QDeclarativeItem.TransformOrigin
```
控制点哪些简单的变换一样的规模应用。
| Constant | Value | Description |
| --- | --- | --- |
| `QDeclarativeItem.TopLeft` | `0` | 该项目的左上角。 |
| `QDeclarativeItem.Top` | `1` | 该项目的顶部的中心点。 |
| `QDeclarativeItem.TopRight` | `2` | 该项目的右上角。 |
| `QDeclarativeItem.Left` | `3` | 最左边的点的垂直中间。 |
| `QDeclarativeItem.Center` | `4` | 该项目的中心。 |
| `QDeclarativeItem.Right` | `5` | 最右点的垂直中间。 |
| `QDeclarativeItem.BottomLeft` | `6` | 该项目的左下角。 |
| `QDeclarativeItem.Bottom` | `7` | 该项目的底部的中心点。 |
| `QDeclarativeItem.BottomRight` | `8` | 该项目的右下角。 |
* * *
## Method Documentation
```
QDeclarativeItem.__init__ (self, QDeclarativeItem 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。
构造一个[QDeclarativeItem](qdeclarativeitem.html)用给定的_parent_。
```
float QDeclarativeItem.baselineOffset (self)
```
```
QRectF QDeclarativeItem.boundingRect (self)
```
[](qrectf.html)
```
QRectF QDeclarativeItem.childrenRect (self)
```
[
```
QDeclarativeItem.classBegin (self)
```
```
bool QDeclarativeItem.clip (self)
```
```
QDeclarativeItem.componentComplete (self)
```
```
bool QDeclarativeItem.event (self, QEvent)
```
```
QDeclarativeItem.geometryChanged (self, QRectF newGeometry, QRectF oldGeometry)
```
调用此函数从处理这个项目的变化几何_oldGeometry_至_newGeometry_。如果两个几何是相同的,它不会做任何事情。
```
bool QDeclarativeItem.hasFocus (self)
```
```
bool QDeclarativeItem.heightValid (self)
```
返回是否高度属性已显式设置。
```
float QDeclarativeItem.implicitHeight (self)
```
```
float QDeclarativeItem.implicitWidth (self)
```
```
QDeclarativeItem.inputMethodEvent (self, QInputMethodEvent)
```
```
QVariant QDeclarativeItem.inputMethodQuery (self, Qt.InputMethodQuery query)
```
```
bool QDeclarativeItem.isComponentComplete (self)
```
返回True如果建设QML组件是完整的,否则返回False 。
它通常是可取的延迟一定的处理,直到该组件完成。
](qrectf.html)
[**See also**](qrectf.html) [componentComplete](qdeclarativeparserstatus.html#componentComplete)( ) 。
```
QVariant QDeclarativeItem.itemChange (self, QGraphicsItem.GraphicsItemChange, QVariant)
```
```
bool QDeclarativeItem.keepMouseGrab (self)
```
返回一个值,指示鼠标输入是否应该保持这资料的独家。
**See also** [setKeepMouseGrab](qdeclarativeitem.html#setKeepMouseGrab)( ) 。
```
QDeclarativeItem.keyPressEvent (self, QKeyEvent event)
```
```
QDeclarativeItem.keyReleaseEvent (self, QKeyEvent event)
```
```
QDeclarativeItem.paint (self, QPainter, QStyleOptionGraphicsItem, QWidget)
```
```
QDeclarativeItem QDeclarativeItem.parentItem (self)
```
[
```
bool QDeclarativeItem.sceneEvent (self, QEvent)
```
```
QDeclarativeItem.setBaselineOffset (self, float)
```
```
QDeclarativeItem.setClip (self, bool)
```
```
QDeclarativeItem.setHeight (self, float)
```
```
QDeclarativeItem.setImplicitHeight (self, float)
```
设置项的隐含高度_h_。这是由确定的内容的其他属性隐含的高度。
](qdeclarativeitem.html)
[**See also**](qdeclarativeitem.html) [implicitHeight](qdeclarativeitem.html#implicitHeight-prop)( ) 。
```
QDeclarativeItem.setImplicitWidth (self, float)
```
设置项的隐含宽度_w_。这是由确定的内容的其他属性隐含的宽度。
**See also** [implicitWidth](qdeclarativeitem.html#implicitWidth-prop)( ) 。
```
QDeclarativeItem.setKeepMouseGrab (self, bool)
```
该标志指示鼠标是否应该保留此项目设置为_keep_。
这对于那些希望抓住并保持鼠标交互下一个预定义手势的项目有用。例如,一个项目,有兴趣水平移动鼠标可设置keepMouseGrab为True一旦已超过阈值。一旦keepMouseGrab已被设置为True,则过滤项将不响应鼠标事件。
如果该项目没有表明它希望保留鼠标抓取,过滤项目可能窃取抢。例如, Flickable可能会尝试,如果它检测到用户已经开始移动视偷鼠标抓取。
**See also** [keepMouseGrab](qdeclarativeitem.html#keepMouseGrab)( ) 。
```
QDeclarativeItem.setParentItem (self, QDeclarativeItem parent)
```
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。
```
QDeclarativeItem.setSmooth (self, bool)
```
```
QDeclarativeItem.setTransformOrigin (self, TransformOrigin)
```
设置变换_origin_。
**See also** [transformOrigin](qdeclarativeitem.html#transformOrigin)( ) 。
```
QDeclarativeItem.setWidth (self, float)
```
```
bool QDeclarativeItem.smooth (self)
```
```
TransformOrigin QDeclarativeItem.transformOrigin (self)
```
[
返回当前变换原点。
](qdeclarativeitem.html#TransformOrigin-enum)
[**See also**](qdeclarativeitem.html#TransformOrigin-enum) [setTransformOrigin](qdeclarativeitem.html#setTransformOrigin)( ) 。
```
bool QDeclarativeItem.widthValid (self)
```
返回是否width属性被显式设置。
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- 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