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.
Spinner widget :
To work with spinner you must have to import:
from kivy.uix.spinner import Spinner
Spinner is a widget that provides a quick way to select one value from a set. In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all the other available values from which the user can select a new one.
Like a combo box, a spinner object can have multiple values and one of the values can be selected.
A callback can be attached to the spinner object to receive notifications on selection of a value from the spinner object.
Basic Approach:
1) import kivy
2) import kivyApp
3) import spinner
4) import Floatlayout(according to need)
5) import window(optional)
6) Set minimum version(optional)
7) Create Layout class:
define the clicked function in it
8) Create App class
9) create .kv file (name same as the app class):
1) create Spinner
2) create callback
3) And many more styling as needed
10) return Layout/widget/Class(according to requirement)
11) Run an instance of the class
Below is the implementation :
In the below code we have created the spinner and done the sizing and positioning and also attached the callback to the values.
.py file:
Python3
# Sample spinner app in kivy using .kv file # to change the kivy default settings we use this module config from kivy.config import Config # 0 being off 1 being on as in true / false # you can use 0 or 1 && True or False Config.set('graphics', 'resizable', True) # Program to Show how to create a switch # import kivy module import kivy # base Class of your App inherits from the App class. # app:always refers to the instance of your application from kivy.app import App # this restrict the kivy version i.e # below this kivy version you cannot # use the app or software kivy.require('1.9.0') # Spinner is a widget that provides a # quick way to select one value from a set. # like a dropdown list from kivy.uix.spinner import Spinner # module consists the floatlayout # to work with FloatLayout first # you have to import it from kivy.uix.floatlayout import FloatLayout # Here for providing colour to the background from kivy.core.window import Window # create LayoutClass class SampBoxLayout(FloatLayout): # For Spinner defining spinner clicked function def spinner_clicked(self, value): print("Language selected is " + value) # # Make an App by deriving from the App class class SampleApp(App): def build(self): # Set the background color for the window Window.clearcolor = (0.555, 0.261, .888, 0.5) return SampBoxLayout() # create object for the Appclass root = SampleApp() # run the class root.run() |
.kv file of the code:
Python3
# .kv file implementation of the .py file # Creating the Layout i.e root of the Layout class <SampBoxLayout>: # creating the spinner Spinner: # Assigning id id: spinner_id # Callback on_text: root.spinner_clicked(spinner_id.text) # initially text on spinner text: "Python" # total values on spinner values: ["Python", "Java", "C++", "C", "C#", "PHP"] # declaring size of the spinner # and the position of it size_hint: None, None size: 200, 50 pos_hint:{'center_x':.5, 'top': 1} |
Output:
Image 1:
Image 2:
Image 3:
Below is the output in video to get better understanding:
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