PyQt5 – QActionGroup

QActionGroup： 在PyQt5应用程序中，许多常见的命令可以通过菜单、工具栏按钮和键盘快捷键来调用，由于用户希望每个命令以相同的方式执行，无论使用何种用户界面，QAction都可以用来表示每个命令的操作。在某些情况下，将QAction对象组合在一起是很有用的，这样用户就可以像单选按钮一样，一次只选择（选中）一个QAction。此外，为了查看动作组的效果，添加到它的动作应该是可检查的。

以下是动作组中的动作在菜单中的样子

语法：

action_group = QActionGroup()

这个action_group是用来添加那些应该位于同一组的QAction的，它们可以在addAction方法的帮助下被添加。下面是一些经常使用的QAction的命令

addAction : 要将QAction添加到其中

setEnabled : 要使QActionGroup启用或停用

setExclusionPolicy : 要对行动组设置排除策略

checkedAction : 它返回当前检查的行动

removeAction : 要从组中删除特定的QAction

actions : 它返回QAction组的列表

示例：

在这里我们将创建一个菜单栏，它将有一个菜单，并有多个可检查的QAction，下面是实现

# importing libraries
from PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * from PyQt5.QtCore import * import sys
 
 
class Window(QMainWindow):
 
    def __init__(self):
        super().__init__()
 
        # setting title
        self.setWindowTitle("Python ")
 
        # setting geometry
        self.setGeometry(100, 100, 500, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
 
 
    # method for components
    def UiComponents(self):
 
        # creating a menu bar
        menubar = self.menuBar()
 
        # creating a selection menu
        selMenu = menubar.addMenu('Selection')
 
        # creating QAction Instances
        action1 = QAction("One", self)
        action2 = QAction("Two", self)
        action3 = QAction("Three", self)
        action4 = QAction("Four", self)
 
        # making actions checkable
        action1.setCheckable(True)
        action2.setCheckable(True)
        action3.setCheckable(True)
        action4.setCheckable(True)
 
        # adding these actions to the selection menu
        selMenu.addAction(action1)
        selMenu.addAction(action2)
        selMenu.addAction(action3)
        selMenu.addAction(action4)
 
        # creating a action group
        action_group = QActionGroup(self)
 
        # adding these action to the action group
        action_group.addAction(action1)
        action_group.addAction(action2)
        action_group.addAction(action3)
        action_group.addAction(action4)
 
        # creating a label
        label = QLabel("GeeksforGeeks", self)
 
        # setting geometry to the label
        label.setGeometry(100, 150, 200, 50)
 
        # adding triggered action to the first action
        action1.triggered.connect(lambda: label.setText("Action 1 is Checked"))
 
        # adding triggered action to the second action
        action2.triggered.connect(lambda: label.setText("Action 2 is Checked"))
 
        # adding triggered action to the third action
        action3.triggered.connect(lambda: label.setText("Action 3 is Checked"))
 
        # adding triggered action to the fourth action
        action4.triggered.connect(lambda: label.setText("Action 4 is Checked"))
 
 
 
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())

输出：

另一个例子

在这个例子中，我们将创建一个具有多个QAction的工具条，这些QAction由两个动作组来完成，下面是实现情况

# importing libraries
from PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * from PyQt5.QtCore import * import sys
 
 
class Window(QMainWindow):
 
    def __init__(self):
        super().__init__()
 
        # setting title
        self.setWindowTitle("Python ")
 
        # setting geometry
        self.setGeometry(100, 100, 500, 400)
 
        # calling method
        self.UiComponents()
 
        # showing all the widgets
        self.show()
 
        # method for components
 
    def UiComponents(self):
        # creating a tool bar
        toolbar = QToolBar(self)
 
        # setting geometry to the tool bar
        toolbar.setGeometry(50, 100, 300, 35)
 
        # creating QAction Instances
        action1 = QAction("One", self)
        action2 = QAction("Two", self)
        action3 = QAction("Three", self)
        action4 = QAction("Four", self)
 
        # making actions checkable
        action1.setCheckable(True)
        action2.setCheckable(True)
        action3.setCheckable(True)
        action4.setCheckable(True)
 
        # adding these actions to the tool bar
        toolbar.addAction(action1)
        toolbar.addAction(action2)
        toolbar.addAction(action3)
        toolbar.addAction(action4)
 
        # creating a first action group
        action_group1 = QActionGroup(self)
 
        # adding these action to the action group
        action_group1.addAction(action1)
        action_group1.addAction(action2)
 
        # creating a second action group
        action_group2 = QActionGroup(self)
 
        action_group2.addAction(action3)
        action_group2.addAction(action4)
 
        # creating a label
        label = QLabel("GeeksforGeeks", self)
 
        # setting geometry to the label
        label.setGeometry(100, 150, 200, 50)
 
        # adding triggered action to the first action
        action1.triggered.connect(lambda: label.setText("Action 1 is Checked"))
 
        # adding triggered action to the second action
        action2.triggered.connect(lambda: label.setText("Action 2 is Checked"))
 
        # adding triggered action to the third action
        action3.triggered.connect(lambda: label.setText("Action 3 is Checked"))
 
        # adding triggered action to the fourth action
        action4.triggered.connect(lambda: label.setText("Action 4 is Checked"))
 
# create pyqt5 app
App = QApplication(sys.argv)
 
# create the instance of our Window
window = Window()
 
# start the app
sys.exit(App.exec())