Using Checkboxes In A Kivy App

Overview:

  • Kivy supports both checkboxes and radio buttons to be used in the Apps.

 

  • Checkboxes are two state buttons with the states being checked and unchecked.

 

  • Checkboxes have an accompanying label that describes the purpose of the checkbox.

 

  • Checkboxes can be grouped together to form radio buttons.

 

  • The selection of a radio button in a group of radio buttons is mutually exclusive.

 

  • Only one of the radio buttons can be selected at any point in time.

 

  • Check boxes are used to convey whether a setting is to be applied or not.

 

  • Radio buttons are used to convey which setting among multiple settings to be applied.

 

Example:

# uix related

from kivy.uix.widget import Widget

from kivy.uix.label import Label

from kivy.uix.checkbox import CheckBox

from kivy.uix.gridlayout import GridLayout

 

# Graphics related

from kivy.graphics import InstructionGroup

from kivy.graphics import Color

from kivy.graphics import Rectangle

 

from kivy.app import App

 

from kivy.core.window import Window

 

 

# Container class for the app's widgets

class UserInterface(GridLayout):

 

    def __init__(self, **kwargs):

        super(UserInterface, self).__init__(**kwargs)

       

        # Add labels and checkbox

        self.cols = 2

        self.add_widget(Label(text='Rotate Mode'))

        self.cb_roateMode = CheckBox(active=True)

        self.add_widget(self.cb_roateMode)

       

        self.lbl_roateMode = Label(text='Rotate Mode is on')

        self.add_widget(self.lbl_roateMode)

       

        # Change the color of the background to grey

        blue = InstructionGroup()

        blue.add(Color(1, 1, 1, .3))

        blue.add(Rectangle(pos=self.pos, size=(Window.width, Window.height)))

        self.canvas.add(blue)

       

        # Attach a callback

        self.cb_roateMode.bind(active=self.on_roateMode_Active)

 

    # Callback for the checkbox

    def on_roateMode_Active(self, checkboxInstance, isActive):

        if isActive:

            self.lbl_roateMode.text = "Rotate mode is on"

        else:

            self.lbl_roateMode.text = "Rotate mode is off"

 

# App derived from App class

class CheckBoxApp(App):

 

    def build(self):

        ux = UserInterface()

        return ux

 

# Run the app

if __name__ == '__main__':

    CheckBoxApp().run()        

 

Output:

Check boxes in Kivy

 

 

 

 

 


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