QActionGroup : In PyQt5 applications many common commands can be invoked via menus, toolbar buttons, and keyboard shortcuts, since the user expects each command to be performed in the same way, regardless of the user interface used, QAction is useful to represent each command as an action. In some situations it is useful to group QAction objects together, so that user can only select(check) only one QAction at a time just like radio buttons. Also in order to view the effect og action group the action added to it should be checkable.
Below is how an actions in action group will look inside the menu
Syntax:
action_group = QActionGroup()
This action_group is used by adding those QAction which should lie in same group, they can be added with the help of addAction method. Below are the some frequently used commands with the QAction
addAction : To add QAction to it setEnabled : To make QActionGroup enable or disable setExclusionPolicy : To set exclusion policy to the action group checkedAction : It returns the currently checked action removeAction : To remove the specific QAction from the group actions : It returns the list of QAction group is having
Example :
In this we will create a menu bar which will have a menu, and having multiple checkable QAction, below is the implementation
Python3
# importing librariesfrom PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import * from PyQt5.QtCore import * import sysclass 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("Lazyroar", 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 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output :
Another Example
In this we will create a tool bar having multiple QAction which are dived by two action group, below is the implementation
Python3
# importing librariesfrom PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import * from PyQt5.QtCore import * import sysclass 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("Lazyroar", 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 appApp = QApplication(sys.argv)# create the instance of our Window window = Window()# start the app sys.exit(App.exec()) |
Output :
