# QProgressBar Class Reference
## [[QtGui](index.htm) module]
该QProgressBar部件提供水平或垂直进度条。[More...](#details)
继承[QWidget](qwidget.html)。
### Types
* `enum Direction { TopToBottom, BottomToTop }`
### Methods
* `__init__ (self, QWidget parent = None)`
* `Qt.Alignment alignment (self)`
* `bool event (self, QEvent e)`
* `QString format (self)`
* `initStyleOption (self, QStyleOptionProgressBar option)`
* `bool invertedAppearance (self)`
* `bool isTextVisible (self)`
* `int maximum (self)`
* `int minimum (self)`
* `QSize minimumSizeHint (self)`
* `Qt.Orientation orientation (self)`
* `paintEvent (self, QPaintEvent)`
* `reset (self)`
* `setAlignment (self, Qt.Alignment alignment)`
* `setFormat (self, QString format)`
* `setInvertedAppearance (self, bool invert)`
* `setMaximum (self, int maximum)`
* `setMinimum (self, int minimum)`
* `setOrientation (self, Qt.Orientation)`
* `setRange (self, int minimum, int maximum)`
* `setTextDirection (self, Direction textDirection)`
* `setTextVisible (self, bool visible)`
* `setValue (self, int value)`
* `QSize sizeHint (self)`
* `QString text (self)`
* `Direction textDirection (self)`
* `int value (self)`
### Qt Signals
* `void valueChanged (int)`
* * *
## Detailed Description
该QProgressBar部件提供水平或垂直进度条。
一个进度条是用来给用户的操作的进度指示,并安抚他们的应用程序仍在运行。
进度栏所使用的概念_steps_。你设置它通过指定最小和最大可能的步长值,它会显示的步骤已经完成的百分比,当你以后给它当前的步长值。该百分比除以进度计算([value](qprogressbar.html#value-prop)() - [minimum](qprogressbar.html#minimum-prop)() )除以[maximum](qprogressbar.html#maximum-prop)() - [minimum](qprogressbar.html#minimum-prop)( ) 。
您可以指定最小和最大步数与[setMinimum](qprogressbar.html#minimum-prop)()和setMaximum 。的步骤的当前数量设置与[setValue](qprogressbar.html#value-prop)( ) 。进度条可以倒到开头与[reset](qprogressbar.html#reset)( ) 。
如果最小和最大两个都设置为0 ,指示条显示了一个忙閒指示,而不是步骤的百分比。使用时,这是有用的,例如,[QFtp](qftp.html) or [QNetworkAccessManager](qnetworkaccessmanager.html)下载项目时,他们无法确定正在下载的项目的大小。
| ![Screenshot of a Macintosh style progress bar](https://img.kancloud.cn/47/35/47356e60fd20316ce0998ff302dfb4bf_172x32.png) | A progress bar shown in the Macintosh widget style. |
| ![Screenshot of a Windows XP style progress bar](https://img.kancloud.cn/e5/94/e59402991d6587936812768594f591bd_183x34.png) | A progress bar shown in the Windows XP widget style. |
| ![Screenshot of a Plastique style progress bar](https://img.kancloud.cn/ba/74/ba74038ba743245888bf5fae6d88f616_181x37.png) | A progress bar shown in the Plastique widget style. |
* * *
## Type Documentation
```
QProgressBar.Direction
```
指定的阅读方向[text](qprogressbar.html#text-prop)垂直进度条。
| Constant | Value | Description |
| --- | --- | --- |
| `QProgressBar.TopToBottom` | `0` | 该文本顺时针旋转90度。 |
| `QProgressBar.BottomToTop` | `1` | 文本逆时针旋转90度。 |
请注意,文字是否绘制取决于风格。目前CDE , CleanLooks ,Motif和PLASTIQUE绘制文本。 Mac,Windows和WindowsXP的风格没有。
这个枚举被引入或修改的Qt 4.1 。
**See also** [textDirection](qprogressbar.html#textDirection-prop)。
* * *
## Method Documentation
```
QProgressBar.__init__ (self, 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。
构造一个进度条给定的_parent_。
默认情况下,最小步长值被设置为0 ,最大值为100。
**See also** [setRange](qprogressbar.html#setRange)( ) 。
```
Qt.Alignment QProgressBar.alignment (self)
```
[
```
bool QProgressBar.event (self, QEvent e)
```
](index.htm)
[从重新实现](index.htm)[QObject.event](qobject.html#event)( ) 。
```
QString QProgressBar.format (self)
```
```
QProgressBar.initStyleOption (self, QStyleOptionProgressBar option)
```
初始化_option_与其它的值[QProgressBar](qprogressbar.html)。当他们需要一个这种方法是有用的子类[QStyleOptionProgressBar](qstyleoptionprogressbar.html) or [QStyleOptionProgressBarV2](qstyleoptionprogressbarv2.html),但不希望在所有的信息填写自己。此功能将检查的版本[QStyleOptionProgressBar](qstyleoptionprogressbar.html)并填写了附加价值[QStyleOptionProgressBarV2](qstyleoptionprogressbarv2.html)。
**See also** [QStyleOption.initFrom](qstyleoption.html#initFrom)( ) 。
```
bool QProgressBar.invertedAppearance (self)
```
```
bool QProgressBar.isTextVisible (self)
```
```
int QProgressBar.maximum (self)
```
```
int QProgressBar.minimum (self)
```
```
QSize QProgressBar.minimumSizeHint (self)
```
[](qsize.html)
[从重新实现](qsize.html)[QWidget.minimumSizeHint](qwidget.html#minimumSizeHint-prop)( ) 。
```
Qt.Orientation QProgressBar.orientation (self)
```
[
```
QProgressBar.paintEvent (self, QPaintEvent)
```
](qt.html#Orientation-enum)
[从重新实现](qt.html#Orientation-enum)[QWidget.paintEvent](qwidget.html#paintEvent)( ) 。
```
QProgressBar.reset (self)
```
这种方法也是一个Qt槽与C + +的签名`void reset()`。
重置进度条。进度条“倒带”,并表示没有任何进展。
```
QProgressBar.setAlignment (self, Qt.Alignment alignment)
```
```
QProgressBar.setFormat (self, QString format)
```
```
QProgressBar.setInvertedAppearance (self, bool invert)
```
```
QProgressBar.setMaximum (self, int maximum)
```
这种方法也是一个Qt槽与C + +的签名`void setMaximum(int)`。
```
QProgressBar.setMinimum (self, int minimum)
```
这种方法也是一个Qt槽与C + +的签名`void setMinimum(int)`。
```
QProgressBar.setOrientation (self, Qt.Orientation)
```
这种方法也是一个Qt槽与C + +的签名`void setOrientation(Qt::Orientation)`。
```
QProgressBar.setRange (self, int minimum, int maximum)
```
将进度条的最大值和最小值来_minimum_和_maximum_分别。
If _maximum_小于_minimum_,_minimum_成为唯一的合法值。
如果当前值超出了新的范围,进度条带复位[reset](qprogressbar.html#reset)( ) 。
**See also** [minimum](qprogressbar.html#minimum-prop)和[maximum](qprogressbar.html#maximum-prop)。
```
QProgressBar.setTextDirection (self, Direction textDirection)
```
```
QProgressBar.setTextVisible (self, bool visible)
```
```
QProgressBar.setValue (self, int value)
```
这种方法也是一个Qt槽与C + +的签名`void setValue(int)`。
```
QSize QProgressBar.sizeHint (self)
```
[](qsize.html)
[从重新实现](qsize.html)[QWidget.sizeHint](qwidget.html#sizeHint-prop)( ) 。
```
QString QProgressBar.text (self)
```
```
Direction QProgressBar.textDirection (self)
```
[
```
int QProgressBar.value (self)
```
* * *
## Qt Signal Documentation
```
void valueChanged (int)
```
这是该信号的默认超载。
当进度条改变显示的值这个信号被发射。_value_是通过进度条显示的新值。
](qprogressbar.html#Direction-enum)
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- 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