# QPushButton Class Reference
## [[QtGui](index.htm) module]
該QPushButton窗口部件提供了一個命令按鈕。[More...](#details)
繼承[QAbstractButton](qabstractbutton.html)。
通過繼承[QCommandLinkButton](qcommandlinkbutton.html)。
### Methods
* `__init__ (self, QWidget?parent?=?None)`
* `__init__ (self, QString?text, QWidget?parent?=?None)`
* `__init__ (self, QIcon?icon, QString?text, QWidget?parent?=?None)`
* `bool autoDefault (self)`
* `bool event (self, QEvent?e)`
* `focusInEvent (self, QFocusEvent)`
* `focusOutEvent (self, QFocusEvent)`
* `initStyleOption (self, QStyleOptionButton?option)`
* `bool isDefault (self)`
* `bool isFlat (self)`
* `keyPressEvent (self, QKeyEvent)`
* `QMenu menu (self)`
* `QSize minimumSizeHint (self)`
* `paintEvent (self, QPaintEvent)`
* `setAutoDefault (self, bool)`
* `setDefault (self, bool)`
* `setFlat (self, bool)`
* `setMenu (self, QMenu?menu)`
* `showMenu (self)`
* `QSize sizeHint (self)`
* * *
## Detailed Description
該QPushButton窗口部件提供了一個命令按鈕。
按鈕或命令按鈕,也許是任何圖形用戶界面中最常用的部件。推(點擊)按鈕來命令計算機執行某些操作,或回答一個問題。典型的按鈕是確定,應用,取消,關閉,是,否和幫助。
一個命令按鈕是長方形,通常會顯示描述其操作的文本標籤。快捷鍵可以首選使用的字符在文本中的&符號前面的指定。例如:
```
QPushButton *button = new QPushButton("&Download", this);
```
在這個例子中,快捷鍵是_Alt+D_。請參閱[QShortcut](qshortcut.html#mnemonic)有關詳細信息的文檔(顯示的實際符號,使用“\u0026\u0026” ) 。
按鈕顯示文本標籤,以及可選的小圖標。這些可以通過構造函數來設置和使用后來改[setText](qabstractbutton.html#text-prop)()和[setIcon](qabstractbutton.html#icon-prop)( ) 。如果禁用該按鈕上的文字和圖標的外觀將會被操縱方面的圖形用戶界面風格,使按鈕看起來“已禁用” 。
一個按鈕發出的信號[clicked](qabstractbutton.html#clicked)()時,它是由鼠標,空格鍵或鍵盤快捷方式激活。連接到這個信號來執行按鈕的操作。推動按鈕也提供不太常用的信號,例如,[pressed](qabstractbutton.html#pressed)()和[released](qabstractbutton.html#released)( ) 。
在對話框的命令按鈕是默認自動默認按鈕,即會自動成為默認的按鈕,當他們收到的鍵盤輸入焦點。默認按鈕是一個按鈕,當用戶按下Enter鍵或Return鍵在對話框被激活。您可以更改此[setAutoDefault](qpushbutton.html#autoDefault-prop)( ) 。需要注意的是自動默認按鈕保留一點點額外的空間,它是要訂一個默認按鈕指示燈。如果你不想在你的按鈕這個空間,調用setAutoDefault (假) 。
由于酒店地處中央,按鈕控件已經成長為容納了大量的變化,在過去的十年。微軟風格指南現在顯示的Windows按鈕約十個不同國家和文本意味著有幾十個,當的特征的所有組合都考慮到了。
最重要的模式或狀態是:
* Available or not (grayed out, disabled).
* Standard push button, toggling push button or menu button.
* On or off (only for toggling push buttons).
* Default or normal. The default button in a dialog can generally be "clicked" using the Enter or Return key.
* Auto-repeat or not.
* Pressed down or not.
作為一般規則,使用一個按鈕時,應用程序或對話框窗口,當用戶點擊它執行一個動作(如適用,取消,關閉和幫助)_and_當插件被認為具有廣泛的,矩形的形狀,文本標籤。小,一般方形按鈕,改變窗口的狀態,而不是執行中的的右上角一個動作(如按鈕[QFileDialog](qfiledialog.html))沒有命令按鈕,但工具按鈕。 Qt提供了一個特殊的類([QToolButton](qtoolbutton.html)),這些按鈕。
如果你需要切換行為(見[setCheckable](qabstractbutton.html#checkable-prop)())或者一個按鈕,自動重復啟動信號時被按下一樣在滾動條中的箭頭(參見[setAutoRepeat](qabstractbutton.html#autoRepeat-prop)( ) ) ,一個命令按鈕可能不是你想要的。當有疑問時,可使用的工具按鈕。
命令按鈕的變化是菜單按鈕。它們提供的不只是一個命令,但是有幾個,因為他們被點擊時,彈出一個選項菜單。使用方法[setMenu](qpushbutton.html#setMenu)( )一個彈出菜單與按鈕相關聯。
其他類的按鈕選項按鈕(請參閱[QRadioButton](qradiobutton.html))和復選框(見[QCheckBox](qcheckbox.html)) 。
|  | A push button shown in the [Macintosh widget style](index.htm).請注意,當一個按鈕的寬度變得小于50或它的高度變得比30小,按鈕的角被改變從圓形到方形。使用[setMinimumSize](qwidget.html#minimumSize-prop)( )函數來防止這種行為。 |
|  | A push button shown in the [Windows XP widget style](index.htm). |
|  | A push button shown in the [Plastique widget style](index.htm). |
在Qt中,[QAbstractButton](qabstractbutton.html)基類提供了大部分的模式和其他的API ,和QPushButton提供GUI邏輯。看[QAbstractButton](qabstractbutton.html)有關API的詳細信息。
* * *
## Method Documentation
```
QPushButton.__init__ (self, QWidget?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。
構造一個按鈕,沒有文字和_parent_。
```
QPushButton.__init__ (self, QString?text, QWidget?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。
構造一個按鈕與父_parent_和文本_text_。
```
QPushButton.__init__ (self, QIcon?icon, QString?text, QWidget?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。
構造一個按鈕用_icon_和_text_和_parent_。
請注意,您也可以通過一個[QPixmap](qpixmap.html)對象為一個圖標(這要歸功于C + +中提供的隱式類型轉換) 。
```
bool QPushButton.autoDefault (self)
```
```
bool QPushButton.event (self, QEvent?e)
```
從重新實現[QObject.event](qobject.html#event)( ) 。
```
QPushButton.focusInEvent (self, QFocusEvent)
```
從重新實現[QWidget.focusInEvent](qwidget.html#focusInEvent)( ) 。
```
QPushButton.focusOutEvent (self, QFocusEvent)
```
從重新實現[QWidget.focusOutEvent](qwidget.html#focusOutEvent)( ) 。
```
QPushButton.initStyleOption (self, QStyleOptionButton?option)
```
初始化_option_與其它的值[QPushButton](qpushbutton.html)。當他們需要一個這種方法是有用的子類[QStyleOptionButton](qstyleoptionbutton.html),但不希望在所有的信息填寫自己。
**See also** [QStyleOption.initFrom](qstyleoption.html#initFrom)( ) 。
```
bool QPushButton.isDefault (self)
```
```
bool QPushButton.isFlat (self)
```
```
QPushButton.keyPressEvent (self, QKeyEvent)
```
從重新實現[QWidget.keyPressEvent](qwidget.html#keyPressEvent)( ) 。
```
QMenu QPushButton.menu (self)
```
[
返回按鈕相關的彈出菜單或0 ,如果沒有彈出式菜單已設置。
](qmenu.html)
[**See also**](qmenu.html) [setMenu](qpushbutton.html#setMenu)( ) 。
```
QSize QPushButton.minimumSizeHint (self)
```
[](qsize.html)
[從重新實現](qsize.html)[QWidget.minimumSizeHint](qwidget.html#minimumSizeHint-prop)( ) 。
```
QPushButton.paintEvent (self, QPaintEvent)
```
從重新實現[QWidget.paintEvent](qwidget.html#paintEvent)( ) 。
```
QPushButton.setAutoDefault (self, bool)
```
```
QPushButton.setDefault (self, bool)
```
```
QPushButton.setFlat (self, bool)
```
```
QPushButton.setMenu (self, QMenu?menu)
```
關聯彈出菜單_menu_與此按鈕。這將打開該按鈕的菜單按鈕,這在一些風格會產生一個小三角按鈕的文本的右側。
菜單的所有權_not_轉移到按鈕。
|  |  | Push buttons with popup menus shown in the [Plastique widget style](index.htm) (left) and [Cleanlooks widget style](index.htm) (right). |
**See also** [menu](qpushbutton.html#menu)( ) 。
```
QPushButton.showMenu (self)
```
這種方法也是一個Qt槽與C + +的簽名`void showMenu()`。
顯示(彈出)相關的彈出式菜單。如果沒有這樣的菜單,這個函數什么都不做。此函數不返回,直到彈出菜單已經被用戶關閉。
```
QSize QPushButton.sizeHint (self)
```
[](qsize.html)
[從重新實現](qsize.html)[QWidget.sizeHint](qwidget.html#sizeHint-prop)( ) 。
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- 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