# QStatusBar Class Reference
## [[QtGui](index.htm) module]
该QStatusBar类提供适合呈现状态信息的单槓。[More...](#details)
继承[QWidget](qwidget.html)。
### Methods
* `__init__ (self, QWidget parent = None)`
* `addPermanentWidget (self, QWidget widget, int stretch = 0)`
* `addWidget (self, QWidget widget, int stretch = 0)`
* `clearMessage (self)`
* `QString currentMessage (self)`
* `bool event (self, QEvent)`
* `hideOrShow (self)`
* `int insertPermanentWidget (self, int index, QWidget widget, int stretch = 0)`
* `int insertWidget (self, int index, QWidget widget, int stretch = 0)`
* `bool isSizeGripEnabled (self)`
* `paintEvent (self, QPaintEvent)`
* `reformat (self)`
* `removeWidget (self, QWidget widget)`
* `resizeEvent (self, QResizeEvent)`
* `setSizeGripEnabled (self, bool)`
* `showEvent (self, QShowEvent)`
* `showMessage (self, QString message, int msecs = 0)`
### Qt Signals
* `void messageChanged (const QString&)`
* * *
## Detailed Description
该QStatusBar类提供适合呈现状态信息的单槓。
每一个状态指示灯分为三类：
* _Temporary_ - briefly occupies most of the status bar. Used to explain tool tip texts or menu entries, for example.
* _Normal_ - occupies part of the status bar and may be hidden by temporary messages. Used to display the page and line number in a word processor, for example.
* _Permanent_ - is never hidden. Used for important mode indications, for example, some applications put a Caps Lock indicator in the status bar.
QStatusBar可以显示所有三种类型的指标。
通常情况下，状态栏功能的请求时就某[QMainWindow](qmainwindow.html)对象。[QMainWindow](qmainwindow.html)提供了一个主应用程序窗口，带有菜单栏，工具栏，停靠小部件_and_围绕一个大型的中央部件的状态栏。状态栏可使用的检索[QMainWindow.statusBar](qmainwindow.html#statusBar)（）函数，并使用替代的[QMainWindow.setStatusBar](qmainwindow.html#setStatusBar)（）函数。
使用[showMessage](qstatusbar.html#showMessage)（）槽，以显示_temporary_消息：
```
void MainWindow.createStatusBar()
{
statusBar()->showMessage(tr("Ready"));
}
```
要删除一个临时消息，使用[clearMessage](qstatusbar.html#clearMessage)（）槽，或调用时，设置一个时间限制[showMessage](qstatusbar.html#showMessage)（ ） 。例如：
```
void MainWindow.print()
{
#ifndef QT_NO_PRINTDIALOG
[QTextDocument](qtextdocument.html) *document = textEdit->document();
[QPrinter](qprinter.html) printer;
[QPrintDialog](qprintdialog.html) *dlg = new [QPrintDialog](qprintdialog.html)(&printer, this);
if (dlg->exec() != [QDialog](qdialog.html).Accepted)
return;
document->print(&printer);
statusBar()->showMessage(tr("Ready"), 2000);
#endif
}
```
使用[currentMessage](qstatusbar.html#currentMessage)（ ）函数来检索当前显示的临时消息。该QStatusBar类还提供了[messageChanged](qstatusbar.html#messageChanged)（ ）这是发射时的临时状态信息变化的信号。
_Normal_和_Permanent_消息显示通过创建一个小部件（[QLabel](qlabel.html)，[QProgressBar](qprogressbar.html)甚至[QToolButton](qtoolbutton.html)） ，然后用其添加到状态栏[addWidget](qstatusbar.html#addWidget)（）或[addPermanentWidget](qstatusbar.html#addPermanentWidget)（）函数。使用[removeWidget](qstatusbar.html#removeWidget)（ ）函数从状态栏中删除此类消息。
```
statusBar()->addWidget(new MyReadWriteIndication);
```
默认情况下QStatusBar提供[QSizeGrip](qsizegrip.html)在右下角。您可以使用禁用的[setSizeGripEnabled](qstatusbar.html#sizeGripEnabled-prop)（）函数。使用[isSizeGripEnabled](qstatusbar.html#sizeGripEnabled-prop)（ ）函数来确定大小手柄的当前状态。
* * *
## Method Documentation
```
QStatusBar.__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。
构造一个状态栏有一个大小的抓地力和给定_parent_。
**See also** [setSizeGripEnabled](qstatusbar.html#sizeGripEnabled-prop)（ ） 。
```
QStatusBar.addPermanentWidget (self, QWidget widget, int stretch = 0)
```
该_widget_说法有它的所有权转移给Qt的。
将给定_widget_永久这个状态栏，重定父级的小工具，如果它已经不这样子[QStatusBar](qstatusbar.html)对象。该_stretch_参数被用来计算一个合适的尺寸对于给定的_widget_作为状态栏的增长和收缩。默认拉伸系数为0，即给插件最小的空间。
永久意味着该插件可能无法被临时消息遮蔽。它位于状态栏的最右边。
**See also** [insertPermanentWidget](qstatusbar.html#insertPermanentWidget)（ ）[removeWidget](qstatusbar.html#removeWidget)（）和[addWidget](qstatusbar.html#addWidget)（ ） 。
```
QStatusBar.addWidget (self, QWidget widget, int stretch = 0)
```
该_widget_说法有它的所有权转移给Qt的。
将给定_widget_这个状态栏，重定父级的小工具，如果它已经不这样子[QStatusBar](qstatusbar.html)对象。该_stretch_参数被用来计算一个合适的尺寸对于给定的_widget_作为状态栏的增长和收缩。默认拉伸系数为0，即给插件最小的空间。
窗口小部件是位于最左侧的第一个永久部件（见[addPermanentWidget](qstatusbar.html#addPermanentWidget)（）） ，并且可以通过临时的消息遮蔽。
**See also** [insertWidget](qstatusbar.html#insertWidget)（ ）[removeWidget](qstatusbar.html#removeWidget)（）和[addPermanentWidget](qstatusbar.html#addPermanentWidget)（ ） 。
```
QStatusBar.clearMessage (self)
```
这种方法也是一个Qt槽与C + +的签名`void clearMessage()`。
删除正在显示的任何临时消息。
**See also** [currentMessage](qstatusbar.html#currentMessage)（ ）[showMessage](qstatusbar.html#showMessage)（）和[removeWidget](qstatusbar.html#removeWidget)（ ） 。
```
QString QStatusBar.currentMessage (self)
```
如果没有这样的消息返回当前显示的临时消息，或空字符串。
**See also** [showMessage](qstatusbar.html#showMessage)（ ） 。
```
bool QStatusBar.event (self, QEvent)
```
从重新实现[QObject.event](qobject.html#event)（ ） 。
```
QStatusBar.hideOrShow (self)
```
确保正确的窗口小部件是可见的。
所使用的[showMessage](qstatusbar.html#showMessage)（）和[clearMessage](qstatusbar.html#clearMessage)（）函数。
```
int QStatusBar.insertPermanentWidget (self, int index, QWidget widget, int stretch = 0)
```
该_widget_说法有它的所有权转移给Qt的。
插入给定_widget_在给定的_index_永久这个状态栏，重定父级的小工具，如果它已经不这样子[QStatusBar](qstatusbar.html)对象。如果_index_超出范围，小部件被追加（在这种情况下它是返回的widget的实际索引） 。
该_stretch_参数被用来计算一个合适的尺寸对于给定的_widget_作为状态栏的增长和收缩。默认拉伸系数为0，即给插件最小的空间。
永久意味着该插件可能无法被临时消息遮蔽。它位于状态栏的最右边。
这个函数中引入了Qt 4.2中。
**See also** [addPermanentWidget](qstatusbar.html#addPermanentWidget)（ ）[removeWidget](qstatusbar.html#removeWidget)（）和[addWidget](qstatusbar.html#addWidget)（ ） 。
```
int QStatusBar.insertWidget (self, int index, QWidget widget, int stretch = 0)
```
该_widget_说法有它的所有权转移给Qt的。
插入给定_widget_在给定的_index_这个状态栏，重定父级的小工具，如果它已经不这样子[QStatusBar](qstatusbar.html)对象。如果_index_超出范围，小部件被追加（在这种情况下它是返回的widget的实际索引） 。
该_stretch_参数被用来计算一个合适的尺寸对于给定的_widget_作为状态栏的增长和收缩。默认拉伸系数为0，即给插件最小的空间。
窗口小部件是位于最左侧的第一个永久部件（见[addPermanentWidget](qstatusbar.html#addPermanentWidget)（）） ，并且可以通过临时的消息遮蔽。
这个函数中引入了Qt 4.2中。
**See also** [addWidget](qstatusbar.html#addWidget)（ ）[removeWidget](qstatusbar.html#removeWidget)（）和[addPermanentWidget](qstatusbar.html#addPermanentWidget)（ ） 。
```
bool QStatusBar.isSizeGripEnabled (self)
```
```
QStatusBar.paintEvent (self, QPaintEvent)
```
从重新实现[QWidget.paintEvent](qwidget.html#paintEvent)（ ） 。
示出了临时消息，如果合适，响应于所述涂料_event_。
```
QStatusBar.reformat (self)
```
改变状态栏的外观佔项目变更。
特殊的子类可能需要该功能，但几何管理通常会采取任何必要重排的照顾。
```
QStatusBar.removeWidget (self, QWidget widget)
```
删除指定的_widget_从状态栏。
**Note:**此功能不会删除该组件，但是_hides_它。再次添加窗口小部件，你必须调用两个[addWidget](qstatusbar.html#addWidget)（）和[show](qwidget.html#show)（）函数。
**See also** [addWidget](qstatusbar.html#addWidget)（ ）[addPermanentWidget](qstatusbar.html#addPermanentWidget)（）和[clearMessage](qstatusbar.html#clearMessage)（ ） 。
```
QStatusBar.resizeEvent (self, QResizeEvent)
```
从重新实现[QWidget.resizeEvent](qwidget.html#resizeEvent)（ ） 。
```
QStatusBar.setSizeGripEnabled (self, bool)
```
```
QStatusBar.showEvent (self, QShowEvent)
```
从重新实现[QWidget.showEvent](qwidget.html#showEvent)（ ） 。
```
QStatusBar.showMessage (self, QString message, int msecs = 0)
```
这种方法也是一个Qt槽与C + +的签名`void showMessage(const QString&,int = 0)`。
隐藏在正常状态指示，并显示给定的_message_为毫秒（指定数目_timeout_） 。如果_timeout_为0 （默认），_message_保持显示，直到[clearMessage](qstatusbar.html#clearMessage)（ ）槽被调用，或者直到showMessage （）槽被再次调用来更改消息。
需要注意的是showMessage （ ）被调用，以显示工具提示文本的临时解释，所以传递_timeout_0不足以显示[permanent message](qstatusbar.html#permanent-message)。
**See also** [messageChanged](qstatusbar.html#messageChanged)（ ）[currentMessage](qstatusbar.html#currentMessage)（）和[clearMessage](qstatusbar.html#clearMessage)（ ） 。
* * *
## Qt Signal Documentation
```
void messageChanged (const QString&)
```
这是该信号的默认超载。
这个信号被发射时的临时状态信息变化。新的临时消息传递的_message_参数是一个空字符串时，该消息已被删除。
**See also** [showMessage](qstatusbar.html#showMessage)（）和[clearMessage](qstatusbar.html#clearMessage)（ ） 。
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- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译：Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- 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