Python|多个滑块小部件在 Kivy 中控制背景屏幕或 WindowColor

先决条件 - Kivy 中的滑块
Kivy 是Python中一个独立于平台的 GUI 工具。因为它可以在Android、IOS、linux和Windows等平台上运行。它基本上是用来开发Android应用程序的，但这并不意味着它不能在桌面应用程序上使用。
在本文中，我们将学习如何在 kivy 中控制背景颜色，这意味着如果我们滑动滑块，窗口的颜色会相应改变。
有许多不同的方法可以做到这一点。让我们看看一种简单的方法。

???????? 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

Kivy 中的多个滑块如何控制背景颜色？

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 class
class Multiple_Slider(App):
    def build(self):
        # returning the instance of SliderWidget class
        return MultipleSliderWidget()
 
# run the app   
if __name__ == '__main__':
    Multiple_Slider().run()

现在上面代码的.kv文件是——

Python3

# Multiple_Slider.kv file of the main.py file.
 
#.kv file to manipulate the window colour.
:
     
    # 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

输出：

视频输出：