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Python | StackLayout in Kivy using .kv file
  • Last Updated : 07 Feb, 2020

Kivy is a platform independent GUI tool in Python. As it can be run on Android, IOS, linux and Windows etc. It is basically used to develop the Android application, but it does not mean that it can not be used on Desktops applications.

👉🏽 Kivy Tutorial – Learn Kivy with Examples.

StackLayout:

To use StackLayout firt import StackLayout by below command:

from kivy.uix.stacklayout import StackLayout

The StackLayout arranges children vertically or horizontally, as many as the layout can fit. The size of the individual children widgets does not have to be uniform. There are 4 row-wise and 4 column wise orientations.

StackLayout Orientation (2D):
 - right to left or left to right
 - top to bottom or bottom to top
 - 'rl-bt', 'rl-tb', lr-bt', 'lr-tb'(Row wise)
 - 'bt-rl', 'bt-lr', 'tb-rl', 'tb-lr'(Column wise)
Basic Approach to create Stack layout :

1) import kivy
2) import kivyApp
3) import Button
4) import Stacklayout
5) Set minimum version(optional)
6) Create the StackLayout class
7) Create the App class
8) Set up .kv file (name same as App class)
9) return StackLayout Class
10) Run an instance of the class

 
Below is the implementation of row-wise orientations and column-wise orientation:



main.py file –




# code to show how to use StackLayout using .kv file
  
# base Class of your App inherits from the App class. 
# app:always refers to the instance of your application 
from kivy.app import App 
    
# creates the button in kivy 
# if not imported shows the error 
from kivy.uix.button import Button
  
# The StackLayout arranges children vertically
# or horizontally, as many as the layout can fit.
from kivy.uix.stacklayout import StackLayout
  
# creating the root widget used in .kv file
class StackLayout(StackLayout):
    pass
  
# class in which name .kv file must be named Slider.kv.
# or creating the App class  
class StackApp(App):
    def build(self):
        # returning the instance of StackLayout class 
        return StackLayout()
  
# run the app
if __name__=='__main__':
    StackApp().run()

The name of the .kv file must be same as the App class i.e Stack.kv

.kv file –




<StackLayout>:
      
  # Different orentation
  # ['lr-tb', 'tb-lr', 'rl-tb', 'tb-rl', 'lr-bt', 'bt-lr', 'rl-bt', 'bt-rl'] 
  orientation: 'lr-tb'
  
  # Creating Multiple Buttons 
  Button:
    text: 'B1'
    size_hint: [.2, .1]
  
  Button:
    text: 'B2'
    size_hint: [.2, .1]
      
  Button:
    text: 'B3'
    size_hint: [.2, .1]
  
  Button:
    text: 'B4'
    size_hint: [.2, .1]
  
  Button:
    text: 'B5'
    size_hint: [.2, .1]
  
  Button:
    text: 'B6'
    size_hint: [.2, .1]
  
  Button:
    text: 'B7'
    size_hint: [.2, .1]
  
  Button:
    text: 'B8'
    size_hint: [.2, .1]
  
  Button:
    text: 'B9'
    size_hint: [.2, .1]
  
  Button:
    text: 'B10'
    size_hint: [.2, .1]

Output:

This is for the orientation ‘lr-tb’. First the widgets are added left-to-right and then top-to-bottom.

Note: If want to change orientation just change the orientation in line no 04 of the .kv file with any of the below orientations –

For row wise orientation use:
  -'lr-tb'
  -'lr-bt'
  -'rl-tb'
  -'rl-bt'

For column wise orientation use:
  -'tb-lr'
  -'tb-rl'
  -'bt-lr'
  -'bt-rl'

 
Below there are picture output all the orientations above –

For row wise orientation use:

'lr-tb'

Output:



'lr-bt'

Output:

'rl-tb'

Output:

'rl-bt'

Output:

 
For column wise orientation use:

'tb-lr'

Output:

'tb-rl'

Output:

'bt-lr'

Output:

'bt-rl'

Output:

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