QActionGroup ¶

概要 ¶

详细描述 ¶

In some situations it is useful to group QAction objects together. For example, if you have a Left Align action, a Right Align action, a Justify action, and a Center action, only one of these actions should be active at any one time. One simple way of achieving this is to group the actions together in an action group.

Here’s a example (from the 菜单 范例)：

alignmentGroup =  QActionGroup(self)
alignmentGroup.addAction(leftAlignAct)
alignmentGroup.addAction(rightAlignAct)
alignmentGroup.addAction(justifyAct)
alignmentGroup.addAction(centerAct)
leftAlignAct.setChecked(True)
											

Here we create a new action group. Since the action group is exclusive by default, only one of the actions in the group is checked at any one time.

A QActionGroup emits an triggered() signal when one of its actions is chosen. Each action in an action group emits its triggered() signal as usual.

As stated above, an action group is exclusive by default; it ensures that at most only one checkable action is active at any one time. If you want to group checkable actions without making them exclusive, you can turn off exclusiveness by calling setExclusive (false).

By default the active action of an exclusive group cannot be unchecked. In some cases it may be useful to allow unchecking all the actions, you can allow this by calling setExclusionPolicy (QActionGroup::ExclusionPolicy::ExclusiveOptional).

Actions can be added to an action group using addAction() , but it is usually more convenient to specify a group when creating actions; this ensures that actions are automatically created with a parent. Actions can be visually separated from each other by adding a separator action to the group; create an action and use QAction ‘s setSeparator() function to make it considered a separator. Action groups are added to widgets with the addActions() 函数。

另请参阅

QAction

class QActionGroup ( parent ) ¶

param parent

QObject

Constructs an action group for the parent 对象。

The action group is exclusive by default. Call setExclusive (false) to make the action group non-exclusive. To make the group exclusive but allow unchecking the active action call instead setExclusionPolicy (QActionGroup::ExclusionPolicy::ExclusiveOptional)

PySide2.QtWidgets.QActionGroup. ExclusionPolicy ¶

This enum specifies the different policies that can be used to control how the group performs exclusive checking on checkable actions.

常量	描述
QActionGroup.ExclusionPolicy.None	The actions in the group can be checked independently of each other.
QActionGroup.ExclusionPolicy.Exclusive	Exactly one action can be checked at any one time. This is the default policy.
QActionGroup.ExclusionPolicy.ExclusiveOptional	At most one action can be checked at any one time. The actions can also be all unchecked.

另请参阅

exclusionPolicy

PySide2.QtWidgets.QActionGroup. actions ( ) ¶

返回类型

Returns the list of this groups’s actions. This may be empty.

PySide2.QtWidgets.QActionGroup. addAction ( icon , text ) ¶

参数

• icon – QIcon

• text – unicode

返回类型

QAction

Creates and returns an action with text 和 icon . The newly created action is a child of this action group.

Normally an action is added to a group by creating it with the group as its parent, so this function is not usually used.

另请参阅

setActionGroup()

PySide2.QtWidgets.QActionGroup. addAction ( a ) ¶

参数

a – QAction

返回类型

QAction

添加 action to this group, and returns it.

Normally an action is added to a group by creating it with the group as its parent, so this function is not usually used.

另请参阅

setActionGroup()

PySide2.QtWidgets.QActionGroup. addAction ( text ) ¶

参数

text – unicode

返回类型

QAction

PySide2.QtWidgets.QActionGroup. checkedAction ( ) ¶

返回类型

QAction

Returns the currently checked action in the group, or None if none are checked.

PySide2.QtWidgets.QActionGroup. exclusionPolicy ( ) ¶

返回类型

ExclusionPolicy

另请参阅

setExclusionPolicy()

PySide2.QtWidgets.QActionGroup. hovered ( arg__1 ) ¶

参数

arg__1 – QAction

PySide2.QtWidgets.QActionGroup. isEnabled ( ) ¶

返回类型

bool

PySide2.QtWidgets.QActionGroup. isExclusive ( ) ¶

返回类型

bool

Returns true if the group is exclusive

The group is exclusive if the ExclusionPolicy is either Exclusive or ExclusionOptional.

PySide2.QtWidgets.QActionGroup. isVisible ( ) ¶

返回类型

bool

PySide2.QtWidgets.QActionGroup. removeAction ( a ) ¶

参数

a – QAction

移除 action from this group. The action will have no parent as a result.

另请参阅

setActionGroup()

PySide2.QtWidgets.QActionGroup. setDisabled ( b ) ¶

参数

b – bool

这是方便函数，为 enabled property, that is useful for signals–slots connections. If b is true the action group is disabled; otherwise it is enabled.

PySide2.QtWidgets.QActionGroup. setEnabled ( arg__1 ) ¶

参数

arg__1 – bool

另请参阅

isEnabled()

PySide2.QtWidgets.QActionGroup. setExclusionPolicy ( policy ) ¶

参数

policy – ExclusionPolicy

另请参阅

exclusionPolicy()

PySide2.QtWidgets.QActionGroup. setExclusive ( arg__1 ) ¶

参数

arg__1 – bool

Enable or disable the group exclusion checking

This is a convenience method that calls setExclusionPolicy (ExclusionPolicy::Exclusive) when b is true, else setExclusionPolicy (QActionGroup::ExclusionPolicy::None).

另请参阅

isExclusive() exclusionPolicy

PySide2.QtWidgets.QActionGroup. setVisible ( arg__1 ) ¶

参数

arg__1 – bool

另请参阅

isVisible()

PySide2.QtWidgets.QActionGroup. triggered ( arg__1 ) ¶

参数

arg__1 – QAction