# QMenu Class Reference
## [[QtGui](index.htm) module]
菜單QMenu類提供了一個菜單部件在菜單欄,上下文菜單,和其他彈出菜單中使用。[More...](#details)
繼承[QWidget](qwidget.html)。
### Methods
* `__init__ (self, QWidget?parent?=?None)`
* `__init__ (self, QString?title, QWidget?parent?=?None)`
* `QAction actionAt (self, QPoint)`
* `actionEvent (self, QActionEvent)`
* `QRect actionGeometry (self, QAction)`
* `QAction activeAction (self)`
* `addAction (self, QAction?action)`
* `QAction addAction (self, QString?text)`
* `QAction addAction (self, QIcon?icon, QString?text)`
* `QAction addAction (self, QString?text, QObject?receiver, SLOT()SLOT()?member, QKeySequence?shortcut?=?0)`
* `QAction addAction (self, QString?text, callable?receiver, QKeySequence?shortcut?=?0)`
* `QAction addAction (self, QIcon?icon, QString?text, QObject?receiver, SLOT()SLOT()?member, QKeySequence?shortcut?=?0)`
* `QAction addAction (self, QIcon?icon, QString?text, callable?receiver, QKeySequence?shortcut?=?0)`
* `QAction addMenu (self, QMenu?menu)`
* `QMenu addMenu (self, QString?title)`
* `QMenu addMenu (self, QIcon?icon, QString?title)`
* `QAction addSeparator (self)`
* `changeEvent (self, QEvent)`
* `clear (self)`
* `int columnCount (self)`
* `QAction defaultAction (self)`
* `enterEvent (self, QEvent)`
* `bool event (self, QEvent)`
* `QAction exec_ (self)`
* `QAction exec_ (self, QPoint?p, QAction?action?=?None)`
* `bool focusNextPrevChild (self, bool?next)`
* `hideEvent (self, QHideEvent)`
* `hideTearOffMenu (self)`
* `QIcon icon (self)`
* `initStyleOption (self, QStyleOptionMenuItem?option, QAction?action)`
* `QAction insertMenu (self, QAction?before, QMenu?menu)`
* `QAction insertSeparator (self, QAction?before)`
* `bool isEmpty (self)`
* `bool isTearOffEnabled (self)`
* `bool isTearOffMenuVisible (self)`
* `keyPressEvent (self, QKeyEvent)`
* `leaveEvent (self, QEvent)`
* `QAction menuAction (self)`
* `mouseMoveEvent (self, QMouseEvent)`
* `mousePressEvent (self, QMouseEvent)`
* `mouseReleaseEvent (self, QMouseEvent)`
* `paintEvent (self, QPaintEvent)`
* `popup (self, QPoint?p, QAction?action?=?None)`
* `bool separatorsCollapsible (self)`
* `setActiveAction (self, QAction?act)`
* `setDefaultAction (self, QAction)`
* `setIcon (self, QIcon?icon)`
* `setNoReplayFor (self, QWidget?widget)`
* `setSeparatorsCollapsible (self, bool?collapse)`
* `setTearOffEnabled (self, bool)`
* `setTitle (self, QString?title)`
* `QSize sizeHint (self)`
* `timerEvent (self, QTimerEvent)`
* `QString title (self)`
* `wheelEvent (self, QWheelEvent)`
### Static Methods
* `QAction exec_ (list-of-QAction?actions, QPoint?pos, QAction?action?=?None)`
* `QAction exec_ (list-of-QAction?actions, QPoint?pos, QAction?at, QWidget?parent)`
### Qt Signals
* `void aboutToHide ()`
* `void aboutToShow ()`
* `void hovered (QAction *)`
* `void triggered (QAction *)`
* * *
## Detailed Description
菜單QMenu類提供了一個菜單部件在菜單欄,上下文菜單,和其他彈出菜單中使用。
menu小部件是一個選擇菜單。它可以是一個菜單欄下拉菜單或獨立的上下文菜單。當用戶點擊相應的項目或按下指定的快捷鍵下拉菜單顯示的菜單欄。使用[QMenuBar.addMenu](qmenubar.html#addMenu)( )插入一個菜單到菜單欄。上下文菜單通常是由一些特殊的鍵盤按鍵或單擊鼠標右鍵調用。它們可以非同步地執行[popup](qmenu.html#popup)()或與同步[exec_](qmenu.html#exec)( ) 。菜單也可以響應按鍵操作調用,這些都是一樣的上下文菜單,除了它們是如何被調用。
|  |  |  |
圖。在顯示的菜單[Plastique widget style](index.htm),[Windows XP widget style](index.htm)和[Macintosh widget style](index.htm)。
### Actions
菜單包括行動項目清單。操作時添加的[addAction](qmenu.html#addAction)( )[addActions](qwidget.html#addActions)()和[insertAction](qwidget.html#insertAction)()函數。一個動作是垂直表示和呈現[QStyle](qstyle.html)。此外,行動可以有一個文本標籤,畫在最左側的可選圖標,快捷鍵序列,例如“ Ctrl + X鍵” 。
通過菜單持有的現有動作可以與發現[actions](qwidget.html#actions)( ) 。
有四種操作項目:分隔符,即顯示一個子菜單的操作,窗口小部件和執行操作的動作。分離器插入[addSeparator](qmenu.html#addSeparator)( ) ,與子菜單[addMenu](qmenu.html#addMenu)( ) ,和所有其他項目都被視為行動項目。
當插入操作項目您通常會指定一個接收器和一個插槽。每當產品的接收器將被notifed[triggered()](qaction.html#triggered)。此外,菜單QMenu提供兩個信號,[activated](index.htm#activated)()和[highlighted](index.htm#highlighted)(),該信號的[QAction](qaction.html)這是從菜單觸發。
你清除一個菜單[clear](qmenu.html#clear)()和remove個別行動項目[removeAction](qwidget.html#removeAction)( ) 。
一個菜單QMenu還可以提供一個分離式菜單。可撕式菜單是包含菜單的副本的頂層窗口。這使得它可以為用戶“撕下”常用菜單,并把它們在屏幕上方便的地方進行定位。如果你想為一個特定的菜單中選擇此功能,將可撕式手柄[setTearOffEnabled](qmenu.html#tearOffEnabled-prop)( ) 。當使用撕下菜單,記住,這個概念通常不使用在Microsoft Windows這樣一些用戶可能并不熟悉它。請考慮使用[QToolBar](qtoolbar.html)代替。
窗口小部件可以被插入到菜單與[QWidgetAction](qwidgetaction.html)類。此類的實例是用來裝小部件,并插入菜單與[addAction](qmenu.html#addAction)( )重載采用一個[QAction](qaction.html)。
反之,操作可以被添加到窗口小部件與[addAction](qmenu.html#addAction)( )[addActions](qwidget.html#addActions)()和[insertAction](qwidget.html#insertAction)()函數。
**Warning:**為了使屏幕上的菜單QMenu可見,[exec_](qmenu.html#exec)()或[popup](qmenu.html#popup)( )應該被用來代替[show](qwidget.html#show)( ) 。
### QMenu on Qt for Windows CE
如果菜單集成到本機的菜單欄上的Windows Mobile不支持的信號: aboutToHide ( ) , aboutToShow ()和徘徊( ) 。這是不可能在Windows Mobile上的本機菜單顯示一個圖標。
### QMenu on Mac OS X with Qt build against Cocoa
菜單QMenu可以在菜單/菜單欄插入一次。后來插入不會有任何影響或將導致禁用的菜單項。
請參閱[Menus](index.htm)示例如何使用示例[QMenuBar](qmenubar.html)和菜單QMenu在你的應用程序。
**Important inherited functions:** [addAction](qmenu.html#addAction)( )[removeAction](qwidget.html#removeAction)( )[clear](qmenu.html#clear)( )[addSeparator](qmenu.html#addSeparator)()和[addMenu](qmenu.html#addMenu)( ) 。
* * *
## Method Documentation
```
QMenu.__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。
構造一個菜單與父_parent_。
雖然一個彈出菜單始終是一個頂級窗口部件,如果父對象被彈出菜單會時父母被破壞(與任何其他刪除[QObject](qobject.html)) 。
```
QMenu.__init__ (self, QString?title, 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。
構造一個菜單,一個_title_和_parent_。
雖然一個彈出菜單始終是一個頂級窗口部件,如果父對象被彈出菜單會時父母被破壞(與任何其他刪除[QObject](qobject.html)) 。
**See also** [title](qmenu.html#title-prop)。
```
QAction QMenu.actionAt (self, QPoint)
```
[
返回位于項目_pt_;返回0 ,如果有有沒有項目。
```
QMenu.actionEvent (self, QActionEvent)
```
](qaction.html)
[從重新實現](qaction.html)[QWidget.actionEvent](qwidget.html#actionEvent)( ) 。
```
QRect QMenu.actionGeometry (self, QAction)
```
[
返回行動的幾何形狀_act_。
](qrect.html)
```
QAction QMenu.activeAction (self)
```
[
返回當前突出顯示的動作,或者0,如果不采取行動是當前突出顯示。
](qaction.html)
[**See also**](qaction.html) [setActiveAction](qmenu.html#setActiveAction)( ) 。
```
QMenu.addAction (self, QAction?action)
```
這是一個重載函數。
用這種便利函數創建一個新動作_text_。該函數將新創建的行動,行動的菜單的列表中,并返回它。
**See also** [QWidget.addAction](qwidget.html#addAction)( ) 。
```
QAction QMenu.addAction (self, QString?text)
```
[
這是一個重載函數。
這個方便的功能創建了一個新動作_icon_有的_text_。該函數將新創建的行動,行動的菜單的列表中,并返回它。
](qaction.html)
[**See also**](qaction.html) [QWidget.addAction](qwidget.html#addAction)( ) 。
```
QAction QMenu.addAction (self, QIcon?icon, QString?text)
```
[
這是一個重載函數。
](qaction.html)
[這種便利函數創建一個文本新動作_text_和一個可選的快捷方式_shortcut_。動作的](qaction.html)[triggered()](qaction.html#triggered)信號被連接到_receiver_的_member_插槽。該函數將新創建的行動,行動的菜單的列表并返回它。
**See also** [QWidget.addAction](qwidget.html#addAction)( ) 。
```
QAction QMenu.addAction (self, QString?text, QObject?receiver, SLOT()SLOT()?member, QKeySequence?shortcut?=?0)
```
[
這是一個重載函數。
](qaction.html)
[這個方便的功能創建了一個新動作_icon_有的_text_和一個可選的快捷方式_shortcut_。動作的](qaction.html)[triggered()](qaction.html#triggered)信號被連接到_member_的槽_receiver_對象。該函數將新創建的行動,行動的菜單的列表中,并返回它。
**See also** [QWidget.addAction](qwidget.html#addAction)( ) 。
```
QAction QMenu.addAction (self, QString?text, callable?receiver, QKeySequence?shortcut?=?0)
```
[
這是一個重載函數。
追加行動_action_于訴訟的菜單的列表。
](qaction.html)
[**See also**](qaction.html) [QMenuBar.addAction](qmenubar.html#addAction)()和[QWidget.addAction](qwidget.html#addAction)( ) 。
```
QAction QMenu.addAction (self, QIcon?icon, QString?text, QObject?receiver, SLOT()SLOT()?member, QKeySequence?shortcut?=?0)
```
[](qaction.html)
```
QAction QMenu.addAction (self, QIcon?icon, QString?text, callable?receiver, QKeySequence?shortcut?=?0)
```
[](qaction.html)
```
QAction QMenu.addMenu (self, QMenu?menu)
```
[](qaction.html)
[這個方便的功能增加_menu_作為一個子菜單,此菜單。它返回_menu_的](qaction.html)[menuAction](qmenu.html#menuAction)( ) 。此菜單不采取所有權_menu_。
**See also** [QWidget.addAction](qwidget.html#addAction)()和[QMenu.menuAction](qmenu.html#menuAction)( ) 。
```
QMenu QMenu.addMenu (self, QString?title)
```
[](qmenu.html)
[添加一個新的](qmenu.html)[QMenu](qmenu.html)同_title_到菜單。菜單采用了菜單的所有權。返回新菜單。
**See also** [QWidget.addAction](qwidget.html#addAction)()和[QMenu.menuAction](qmenu.html#menuAction)( ) 。
```
QMenu QMenu.addMenu (self, QIcon?icon, QString?title)
```
[](qmenu.html)
[添加一個新的](qmenu.html)[QMenu](qmenu.html)同_icon_和_title_到菜單。菜單采用了菜單的所有權。返回新菜單。
**See also** [QWidget.addAction](qwidget.html#addAction)()和[QMenu.menuAction](qmenu.html#menuAction)( ) 。
```
QAction QMenu.addSeparator (self)
```
[](qaction.html)
[這個便利函數創建一個新的分隔作用,即一個行動](qaction.html)[QAction.isSeparator](qaction.html#isSeparator)( )返回True ,并添加了新的行動,行動該菜單的列表。它返回新創建的動作。
**See also** [QWidget.addAction](qwidget.html#addAction)( ) 。
```
QMenu.changeEvent (self, QEvent)
```
從重新實現[QWidget.changeEvent](qwidget.html#changeEvent)( ) 。
```
QMenu.clear (self)
```
刪除所有菜單的操作。通過菜單,而不是在任何其他部件所示資的行動都將被刪除。
**See also** [removeAction](qwidget.html#removeAction)( ) 。
```
int QMenu.columnCount (self)
```
如果一個菜單不適合在屏幕上勾畫出自己,以便它不適合。它的風格取決于什么布局方式(例如,在Windows上,將使用多個列) 。
該函數返回的列所必需的數量。
```
QAction QMenu.defaultAction (self)
```
[
返回當前的默認操作。
](qaction.html)
[**See also**](qaction.html) [setDefaultAction](qmenu.html#setDefaultAction)( ) 。
```
QMenu.enterEvent (self, QEvent)
```
從重新實現[QWidget.enterEvent](qwidget.html#enterEvent)( ) 。
```
bool QMenu.event (self, QEvent)
```
從重新實現[QObject.event](qobject.html#event)( ) 。
```
QAction QMenu.exec_ (self)
```
[
執行此菜單同步。
這等效于`exec(pos())`。
](qaction.html)
[這將返回觸發](qaction.html)[QAction](qaction.html)無論是在彈出菜單或它的一個子菜單,或者0,如果沒有項目被觸發(通常是因為用戶按下Esc鍵) 。
在大多數情況下,你要自己指定的位置,例如,當前鼠標位置:
```
exec([QCursor](qcursor.html).pos());
```
或對齊到一個小部件:
```
exec(somewidget.mapToGlobal([QPoint](qpoint.html)(0,0)));
```
或在反應的[QMouseEvent](qmouseevent.html)* E:
```
exec(e->globalPos());
```
```
QAction QMenu.exec_ (self, QPoint?p, QAction?action?=?None)
```
[
這是一個重載函數。
執行此菜單同步。
](qaction.html)
[彈出的菜單中,這樣的動作_action_將在指定_global_位置_p_。翻譯一個小部件的局部坐標系到全局坐標,使用](qaction.html)[QWidget.mapToGlobal](qwidget.html#mapToGlobal)( ) 。
這將返回觸發[QAction](qaction.html)無論是在彈出菜單或它的一個子菜單,或者0,如果沒有項目被觸發(通常是因為用戶按下Esc鍵) 。
請注意,所有信號都發出如常。如果連接了[QAction](qaction.html)到一個時隙,并調用菜單的[exec_](qmenu.html#exec)( ) ,你既可以通過信號槽連接,并在返回值獲得的結果[exec_](qmenu.html#exec)( ) 。
常見的用法是在當前鼠標位置來定位菜單:
```
exec_([QCursor](qcursor.html).pos());
```
或對齊到一個小部件:
```
exec_(somewidget.mapToGlobal([QPoint](qpoint.html)(0, 0)));
```
或在反應的[QMouseEvent](qmouseevent.html)* E:
```
exec_(e->globalPos());
```
當定位一個菜單[exec_](qmenu.html#exec)()或[popup](qmenu.html#popup)( ) ,請記住,你不能依賴于菜單的電流[size](qwidget.html#size-prop)( ) 。出于性能原因,菜單調整其大小只在必要時。所以在很多情況下,前和后顯示的大小是不同的。相反,使用[sizeHint](qmenu.html#sizeHint)( ),計算適當的大小取決于菜單的當前內容。
**See also** [popup](qmenu.html#popup)()和[QWidget.mapToGlobal](qwidget.html#mapToGlobal)( ) 。
```
QAction QMenu.exec_ (list-of-QAction?actions, QPoint?pos, QAction?action?=?None)
```
[
這是一個重載函數。
執行菜單同步。
](qaction.html)
[菜單的操作由列表中指定的_actions_。該菜單會彈出讓指定的動作,_at_,出現在全球的地位_pos_。如果_at_沒有指定,那么在菜單出現在位置_pos_。_parent_是菜單的父控件,指定母會時提供上下文_pos_還不足以決定在哪里菜單應該去(例如,與多個桌面或當父被嵌入在](qaction.html)[QGraphicsView](qgraphicsview.html)) 。
該函數返回觸發[QAction](qaction.html)無論是在彈出菜單或它的一個子菜單,或者0,如果沒有項目被觸發(通常是因為用戶按下Esc鍵) 。
這相當于:
```
[QMenu](qmenu.html) menu;
[QAction](qaction.html) *at = actions[0]; // Assumes actions is not empty
foreach ([QAction](qaction.html) *a, actions)
menu.addAction(a);
menu.exec_(pos, at);
```
**See also** [popup](qmenu.html#popup)()和[QWidget.mapToGlobal](qwidget.html#mapToGlobal)( ) 。
```
QAction QMenu.exec_ (list-of-QAction?actions, QPoint?pos, QAction?at, QWidget?parent)
```
[
這是一個重載函數。
執行菜單同步。
菜單的操作由列表中指定的_actions_。該菜單會彈出讓指定的動作,_at_,出現在全球的地位_pos_。如果_at_沒有指定,那么在菜單出現在位置_pos_。
](qaction.html)
[該函數返回觸發](qaction.html)[QAction](qaction.html)無論是在彈出菜單或它的一個子菜單,或者0,如果沒有項目被觸發(通常是因為用戶按下Esc鍵) 。
這相當于:
```
[QMenu](qmenu.html) menu;
[QAction](qaction.html) *at = actions[0]; // Assumes actions is not empty
foreach ([QAction](qaction.html) *a, actions)
menu.addAction(a);
menu.exec_(pos, at);
```
**See also** [popup](qmenu.html#popup)()和[QWidget.mapToGlobal](qwidget.html#mapToGlobal)( ) 。
```
bool QMenu.focusNextPrevChild (self, bool?next)
```
從重新實現[QWidget.focusNextPrevChild](qwidget.html#focusNextPrevChild)( ) 。
```
QMenu.hideEvent (self, QHideEvent)
```
從重新實現[QWidget.hideEvent](qwidget.html#hideEvent)( ) 。
```
QMenu.hideTearOffMenu (self)
```
此功能將強行隱藏撕下菜單使得它從用戶的桌面上消失。
**See also** [isTearOffMenuVisible](qmenu.html#isTearOffMenuVisible)()和[isTearOffEnabled](qmenu.html#tearOffEnabled-prop)( ) 。
```
QIcon QMenu.icon (self)
```
[
```
QMenu.initStyleOption (self, QStyleOptionMenuItem?option, QAction?action)
```
](qicon.html)
[初始化_option_從這個菜單和信息的價值_action_。當他們需要一個這種方法是有用的子類](qicon.html)[QStyleOptionMenuItem](qstyleoptionmenuitem.html),但不希望在所有的信息填寫自己。
**See also** [QStyleOption.initFrom](qstyleoption.html#initFrom)()和[QMenuBar.initStyleOption](qmenubar.html#initStyleOption)( ) 。
```
QAction QMenu.insertMenu (self, QAction?before, QMenu?menu)
```
[](qaction.html)
[這個方便的功能插件_menu_行動之前,_before_并返回菜單](qaction.html)[menuAction](qmenu.html#menuAction)( ) 。
**See also** [QWidget.insertAction](qwidget.html#insertAction)()和[addMenu](qmenu.html#addMenu)( ) 。
```
QAction QMenu.insertSeparator (self, QAction?before)
```
[](qaction.html)
[這個便利函數創建一個新的分隔作用,即一個行動](qaction.html)[QAction.isSeparator](qaction.html#isSeparator)( )返回True 。該函數插入新創建的行動變成行動之前行動這個菜單的列表_before_并返回它。
**See also** [QWidget.insertAction](qwidget.html#insertAction)()和[addSeparator](qmenu.html#addSeparator)( ) 。
```
bool QMenu.isEmpty (self)
```
如果有,否則插入菜單中沒有明顯的動作,假,則返回True 。
這個函數中引入了Qt 4.2中。
**See also** [QWidget.actions](qwidget.html#actions)( ) 。
```
bool QMenu.isTearOffEnabled (self)
```
```
bool QMenu.isTearOffMenuVisible (self)
```
當一個菜單被撕下第二個菜單顯示來顯示菜單內容在一個新窗口。當菜單在此模式下,菜單是可見的,則返回True ,否則返回False 。
**See also** [hideTearOffMenu](qmenu.html#hideTearOffMenu)()和[isTearOffEnabled](qmenu.html#tearOffEnabled-prop)( ) 。
```
QMenu.keyPressEvent (self, QKeyEvent)
```
從重新實現[QWidget.keyPressEvent](qwidget.html#keyPressEvent)( ) 。
```
QMenu.leaveEvent (self, QEvent)
```
從重新實現[QWidget.leaveEvent](qwidget.html#leaveEvent)( ) 。
```
QAction QMenu.menuAction (self)
```
[
返回與此菜單關聯的動作。
```
QMenu.mouseMoveEvent (self, QMouseEvent)
```
](qaction.html)
[從重新實現](qaction.html)[QWidget.mouseMoveEvent](qwidget.html#mouseMoveEvent)( ) 。
```
QMenu.mousePressEvent (self, QMouseEvent)
```
從重新實現[QWidget.mousePressEvent](qwidget.html#mousePressEvent)( ) 。
```
QMenu.mouseReleaseEvent (self, QMouseEvent)
```
從重新實現[QWidget.mouseReleaseEvent](qwidget.html#mouseReleaseEvent)( ) 。
```
QMenu.paintEvent (self, QPaintEvent)
```
從重新實現[QWidget.paintEvent](qwidget.html#paintEvent)( ) 。
```
QMenu.popup (self, QPoint?p, QAction?action?=?None)
```
顯示的菜單,使動作_atAction_將在指定_global_位置_p_。翻譯一個小部件的局部坐標系到全局坐標,使用[QWidget.mapToGlobal](qwidget.html#mapToGlobal)( ) 。
當定位一個菜單[exec_](qmenu.html#exec)( )或彈出( ) ,請記住,你不能依賴于菜單的電流[size](qwidget.html#size-prop)( ) 。出于性能原因,菜單調整其大小只有當必要的,所以在很多情況下,前,后演出的規模是不同的。相反,使用[sizeHint](qmenu.html#sizeHint)( ),計算適當的大小取決于菜單的當前內容。
**See also** [QWidget.mapToGlobal](qwidget.html#mapToGlobal)()和[exec_](qmenu.html#exec)( ) 。
```
bool QMenu.separatorsCollapsible (self)
```
```
QMenu.setActiveAction (self, QAction?act)
```
設置當前突出顯示的動作_act_。
**See also** [activeAction](qmenu.html#activeAction)( ) 。
```
QMenu.setDefaultAction (self, QAction)
```
此設置的默認操作為_act_。默認動作可以具有視覺提示,這取決于當前[QStyle](qstyle.html)。默認動作通常表示在默認情況下,當發生跌落會發生什么。
**See also** [defaultAction](qmenu.html#defaultAction)( ) 。
```
QMenu.setIcon (self, QIcon?icon)
```
```
QMenu.setNoReplayFor (self, QWidget?widget)
```
```
QMenu.setSeparatorsCollapsible (self, bool?collapse)
```
```
QMenu.setTearOffEnabled (self, bool)
```
```
QMenu.setTitle (self, QString?title)
```
```
QSize QMenu.sizeHint (self)
```
[](qsize.html)
[從重新實現](qsize.html)[QWidget.sizeHint](qwidget.html#sizeHint-prop)( ) 。
```
QMenu.timerEvent (self, QTimerEvent)
```
從重新實現[QObject.timerEvent](qobject.html#timerEvent)( ) 。
```
QString QMenu.title (self)
```
```
QMenu.wheelEvent (self, QWheelEvent)
```
從重新實現[QWidget.wheelEvent](qwidget.html#wheelEvent)( ) 。
* * *
## Qt Signal Documentation
```
void aboutToHide ()
```
這是該信號的默認超載。
這個信號被發射之前的菜單,從用戶隱藏。
這個函數中引入了Qt 4.2中。
**See also** [aboutToShow](qmenu.html#aboutToShow)()和[hide](qwidget.html#hide)( ) 。
```
void aboutToShow ()
```
這是該信號的默認超載。
這個信號被發射的菜單被顯示給用戶之前。
**See also** [aboutToHide](qmenu.html#aboutToHide)()和[show](qwidget.html#show)( ) 。
```
void hovered (QAction *)
```
這是該信號的默認超載。
當一個菜單操作高亮顯示這個信號被發射;_action_是導致該信號被發射的操作。
通常這是用來更新狀態信息。
**See also** [triggered](qmenu.html#triggered)()和[QAction.hovered](qaction.html#hovered)( ) 。
```
void triggered (QAction *)
```
這是該信號的默認超載。
當在該菜單中的操作被觸發這個信號被發射。
_action_是導致該信號被發射的操作。
通常情況下,在連接每個菜單操作的[triggered()](qaction.html#triggered)信號到其自己的定制插槽,但有時你會想幾個動作連接到一個單一的插槽,例如,當你有一組密切相關的動作,如“左對齊” , “中心” , “右對齊” 。
**Note:**這個信號被發射在一個層次中的父主菜單。因此,只有父菜單需要連接到一個槽;子菜單無需進行連接。
**See also** [hovered](qmenu.html#hovered)()和[QAction.triggered](qaction.html#triggered)( ) 。
- PyQt4 中文文檔
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- Reference
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- 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