Prerequisite – Slider in Kivy
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.
In this article, we will learn How we can control the background color in kivy that means if we slide the slider the color of window changes accordingly.
There are many different methods by which you can make this. Let’s see one simple approach.
???????? Kivy Tutorial – Learn Kivy with Examples.
Basic Approach to make it is very simple:
1) import kivy
2) import kivyApp
3) import BoxLayout
4) set minimum version(optional)
5) Extend the class
6) set up .kv file :
-> Set orientation
-> Set slider color
-> Create canvas.before property
-> Create Sliders
-> Create label
7) Return layout
8) Run an instance of the class
How multiple Sliders Controlling Background Color in Kivy ?
Python3
# main.py to manipulate the window # color or screen colour in 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# BoxLayout arranges children in a vertical or horizontal box. # or help to put the childrens at the desired location. from kivy.uix.boxlayout import BoxLayout # creating the root widget used in .kv file class MultipleSliderWidget(BoxLayout): pass# class in which name .kv file must be named Slider.kv.# or creating the App classclass Multiple_Slider(App): def build(self): # returning the instance of SliderWidget class return MultipleSliderWidget()# run the app if __name__ == '__main__': Multiple_Slider().run() |
Now the .kv file of the above code is –
Python3
# Multiple_Slider.kv file of the main.py file.#.kv file to manipulate the window colour.<MultipleSliderWidget>: # giving the orientation of Slider orientation: "vertical" # initially providing this colour to window slider_colors: 0.5, 0.5, 0.5 # executed before the canvas group. canvas.before: Color: rgb: root.slider_colors Rectangle: pos: root.pos size: root.size # creating the Slider Slider: min: 0 # minimum value of Slider max: 1 # maximum value of Slider value: 0.5 # initial value of Slider # when slider moves then to increase value on_value: root.slider_colors[0] = self.value; Slider: min: 0 max: 1 value: 0.5 on_value: root.slider_colors[1] = self.value Slider: min: 0 max: 1 value: 0.5 on_value: root.slider_colors[2] = self.value # Adding The label Label: font_size: "30sp" # the for loop is for continuously changing # the colour as slider value changes text: "Color:" + ", ".join(["%.3f" %(i) for i in root.slider_colors]) color: 0, 0, 1, 1 |
Output:
Videos Output:
