# QRubberBand Class Reference
## [[QtGui](index.htm) module]
该QRubberBand类提供了一个矩形或线条,可以显示一个选择或边界。[More...](#details)
继承[QWidget](qwidget.html)。
### Types
* `enum Shape { Line, Rectangle }`
### Methods
* `__init__ (self, Shape, QWidget parent = None)`
* `changeEvent (self, QEvent)`
* `bool event (self, QEvent e)`
* `initStyleOption (self, QStyleOptionRubberBand option)`
* `move (self, QPoint p)`
* `move (self, int ax, int ay)`
* `moveEvent (self, QMoveEvent)`
* `paintEvent (self, QPaintEvent)`
* `resize (self, int w, int h)`
* `resize (self, QSize s)`
* `resizeEvent (self, QResizeEvent)`
* `setGeometry (self, QRect r)`
* `setGeometry (self, int ax, int ay, int aw, int ah)`
* `Shape shape (self)`
* `showEvent (self, QShowEvent)`
* * *
## Detailed Description
该QRubberBand类提供了一个矩形或线条,可以显示一个选择或边界。
一种橡胶带通常用来显示一个新的边界区域(如在一个[QSplitter](qsplitter.html)或[QDockWidget](qdockwidget.html)那是出坞) 。历史上使用这种已实施[QPainter](qpainter.html)和XOR ,但这种方法并不总是正确的,因为渲染可能发生在下面的橡皮筋窗口工作,但橡皮筋之前已经被“抹掉” 。
每当你需要渲染围绕一个给定区域橡皮筋(或代表一行),你可以创建一个QRubberBand ,然后调用[setGeometry](qrubberband.html#setGeometry)( )[move](qrubberband.html#move)()或[resize](qrubberband.html#resize)()来定位并调整其大小。一个常见的模式是这样做与鼠标事件一起使用。例如:
```
void Widget.mousePressEvent([QMouseEvent](qmouseevent.html) *event)
{
origin = event->pos();
if (!rubberBand)
rubberBand = new QRubberBand(QRubberBand.Rectangle, this);
rubberBand->setGeometry([QRect](qrect.html)(origin, [QSize](qsize.html)()));
rubberBand->show();
}
void Widget.mouseMoveEvent([QMouseEvent](qmouseevent.html) *event)
{
rubberBand->setGeometry([QRect](qrect.html)(origin, event->pos()).normalized());
}
void Widget.mouseReleaseEvent([QMouseEvent](qmouseevent.html) *event)
{
rubberBand->hide();
// determine selection, for example using QRect.intersects()
// and QRect.contains().
}
```
如果你传递一个父QRubberBand的构造函数,橡皮筋将只显示内部其父,但停留在其他的子控件的顶部。如果没有父母传递, QRubberBand将作为一个顶级窗口部件。
Call [show](qwidget.html#show)()以使橡胶带清晰可见;也当橡胶带不是顶层。隐藏或销毁的部件将使得橡胶带消失。橡胶带可以是一个[Rectangle](qrubberband.html#Shape-enum)或[Line](qrubberband.html#Shape-enum)(垂直或水平) ,这取决于[shape](qrubberband.html#shape)( )获给予该建造。
* * *
## Type Documentation
```
QRubberBand.Shape
```
此枚举指定什么形状的[QRubberBand](qrubberband.html)应该有。这是向下传递到样式系统的绘图提示,并且可以由每个被解释[QStyle](qstyle.html)。
| Constant | Value | Description |
| --- | --- | --- |
| `QRubberBand.Line` | `0` | A [QRubberBand](qrubberband.html)可以代表一个垂直或水平线。几何中仍给予[rect](qwidget.html#rect-prop)( )而行,将填补在大多数款式给定的几何形状。 |
| `QRubberBand.Rectangle` | `1` | A [QRubberBand](qrubberband.html)可以表示一个矩形。有些款式会将此解释为填充(通常半透明)长方形或矩形轮廓。 |
* * *
## Method Documentation
```
QRubberBand.__init__ (self, Shape, QWidget 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。
构造形状的橡皮筋_s_,与父_p_。
默认情况下,一个长方形的橡胶带(_s_ is `Rectangle`)将使用的掩模,使该矩形的小边界是所有可见。有些款式(例如,原生的Mac OS X )将改变这一点,并调用[QWidget.setWindowOpacity](qwidget.html#windowOpacity-prop)( )方法使一个半透明填充选择矩形。
```
QRubberBand.changeEvent (self, QEvent)
```
从重新实现[QWidget.changeEvent](qwidget.html#changeEvent)( ) 。
```
bool QRubberBand.event (self, QEvent e)
```
从重新实现[QObject.event](qobject.html#event)( ) 。
```
QRubberBand.initStyleOption (self, QStyleOptionRubberBand option)
```
初始化_option_与其它的值[QRubberBand](qrubberband.html)。当他们需要一个这种方法是有用的子类[QStyleOptionRubberBand](qstyleoptionrubberband.html),但不希望在所有的信息填写自己。
**See also** [QStyleOption.initFrom](qstyleoption.html#initFrom)( ) 。
```
QRubberBand.move (self, QPoint p)
```
移动橡皮筋到点(_x_,_y_) 。
**See also** [resize](qrubberband.html#resize)( ) 。
```
QRubberBand.move (self, int ax, int ay)
```
这是一个重载函数。
移动橡皮筋指向_p_。
**See also** [resize](qrubberband.html#resize)( ) 。
```
QRubberBand.moveEvent (self, QMoveEvent)
```
从重新实现[QWidget.moveEvent](qwidget.html#moveEvent)( ) 。
```
QRubberBand.paintEvent (self, QPaintEvent)
```
从重新实现[QWidget.paintEvent](qwidget.html#paintEvent)( ) 。
```
QRubberBand.resize (self, int w, int h)
```
调整大小的橡皮筋,使得其宽度为_width_,它的高度是_height_。
**See also** [move](qrubberband.html#move)( ) 。
```
QRubberBand.resize (self, QSize s)
```
这是一个重载函数。
调整大小的橡皮筋,使新的大小是_size_。
**See also** [move](qrubberband.html#move)( ) 。
```
QRubberBand.resizeEvent (self, QResizeEvent)
```
从重新实现[QWidget.resizeEvent](qwidget.html#resizeEvent)( ) 。
```
QRubberBand.setGeometry (self, QRect r)
```
设置橡皮筋的几何_rect_,它的父窗口部件的坐标系中指定。
**See also** [QWidget.geometry](qwidget.html#geometry-prop)。
```
QRubberBand.setGeometry (self, int ax, int ay, int aw, int ah)
```
这是一个重载函数。
设置橡皮的几何形状,其左上角位于该点的矩形(_x_,_y_)中,用由指定的尺寸_width_和_height_。几何体指定的父窗口部件的坐标系中。
```
Shape QRubberBand.shape (self)
```
[
返回此橡皮筋的形状。形状只能在构造设置。
```
QRubberBand.showEvent (self, QShowEvent)
```
](qrubberband.html#Shape-enum)
[从重新实现](qrubberband.html#Shape-enum)[QWidget.showEvent](qwidget.html#showEvent)( ) 。
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- 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