在 Kivy
中更改按钮颜色
原文:https://www.geeksforgeeks.org/change-button-color-in-kivy/
Kivy 是 Python 中独立于平台的 GUI 工具。因为它可以在安卓、IOS、Linux 和视窗等平台上运行。它基本上是用来开发安卓应用程序的，但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 中更改按钮颜色。kivy python 中有一个名为 background_color 的属性，用来改变按钮的颜色。
background _ color–background-color kivy 属性设置元素的背景颜色。它被指定为单一颜色值。
语法:背景 _ 颜色:1，0，0，1
注意:默认情况下，按钮的颜色是黑色(小灰色)如果你想改变它，那么我们使用这个属性。它只取 0 到 1 之间的值。任何其他给定的值都会导致程序的错误行为。
更改按钮颜色时要遵循的基本方法: 1)导入 kivy 2)导入 kivyApp 3)导入所有需要的 4)设置最低版本(可选) 5)添加小部件 6)在设置颜色时添加按钮 6)扩展类 7)返回布局 8)运行类的实例
下面是如何改变按钮颜色的代码:
代码 1#
def build(self):
# use a (r, g, b, a) tuple
btn = Button(text ="Push Me !",
font_size ="20sp",
# Here you can give the color
# The value must be between 0 to 1
# greyish black color
background_color =(1, 1, 1, 1),
size =(32, 32),
size_hint =(.2, .2),
pos =(300, 250))
return btn
代码#2
## Sample Python application demonstrating the
## How to change button color in Kivy.
###################################################
# import kivy module
import kivy
# to choose the colors randomly
# every time you run it shows different color
import random
# this restricts the kivy version i.e
# below this kivy version you cannot
# use the app or software
kivy.require("1.9.1")
# 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
# BoxLayout arranges children in a vertical or horizontal box.
# or help to put the children at the desired location.
from kivy.uix.boxlayout import BoxLayout
# declaring the colours you can use directly also
red = [1, 0, 0, 1]
green = [0, 1, 0, 1]
blue = [0, 0, 1, 1]
purple = [1, 0, 1, 1]
# class in which we are creating the button
class ChangeColorApp(App):
def build(self):
superBox = BoxLayout(orientation ='vertical')
HB = BoxLayout(orientation ='horizontal')
# creating the list of defined colors
colors = [red, green, blue, purple]
# Changing the color of buttons
# here you can see how you can change the color
btn1 = Button(text ="One",
# Color of button is changed not default
background_color = random.choice(colors),
font_size = 32,
size_hint =(0.7, 1))
btn2 = Button(text ="Two",
background_color = random.choice(colors),
font_size = 32,
size_hint =(0.7, 1))
HB.add_widget(btn1)
HB.add_widget(btn2)
VB = BoxLayout(orientation ='vertical')
btn3 = Button(text ="Three",
background_color = random.choice(colors),
font_size = 32,
size_hint =(1, 10))
btn4 = Button(text ="Four",
background_color = random.choice(colors),
font_size = 32,
size_hint =(1, 15))
VB.add_widget(btn3)
VB.add_widget(btn4)
superBox.add_widget(HB)
superBox.add_widget(VB)
return superBox
# creating the object root for App class
root = ChangeColorApp()
# run function runs the whole program
# i.e run() method which calls the
# target function passed to the constructor.
root.run()
输出:
版权属于：月萌API www.moonapi.com，转载请注明出处
