如何在KV中定位canvas.before [英] How to target canvas.before in kv

问题描述

在按钮中，我使用 canvas.before 制作了一个圆形按钮，它会根据需要更改颜色.该行是:

In a button i have made a rounded button with canvas.before, and it changes colors as it should. The line is:

canvas.before:
    Color:
        rgba: btn_color_not_pressed if self.state=='normal' else btn_color_pressed
    RoundedRectangle:
        size: self.size
        pos: self.pos
        radius: [40]

变量 btn_color_not_pressed 和 btn_color_not_pressed 是在kv文件的开头使用#:set 进行的

The variables btn_color_not_pressed and btn_color_not_pressed are made with #:set in the start of the kv-file

我已经尝试使用 self.canvas.before.Color.rgba 定位行，就像我通常那样，但是出现以下错误:

I have tried to target the line with self.canvas.before.Color.rgba, as i am used to normally, but i get following error:

AttributeError:'kivy.graphics.instructions.CanvasBase'对象没有属性'Color'

我该如何在kv中定位该行并替换变量...或在必要时从python文件中替换该变量?如何在 Rectangle 下指定 source:"some_file.jpg "?

How do i target that line from within kv and replace the variables ... or if necessary from the python file.? How do i target the source: "some_file.jpg under Rectangle?

我的目标是，当用户单击某个选项时，应用程序中的所有按钮颜色(也许是背景)都必须更改.

My goal is that when a user has clicked an option all the button colors (and maybe the background) in the app must change.

推荐答案

找到了解决方案(此处: Kivy:在重新进入屏幕时将切换按钮重置为正常" )

Found a solution (here: Kivy: resetting toggle buttons to "normal" on re-entering screen)

这有点丑陋，但是可以..

It's kind'a ugly, but it works..

给每个按钮一个id ...，然后对每个按钮使用 on_enter 并设置和更改状态.

Give every button an id ... and then use on_enter for each button and set and change the state.

在上面的代码中，其含义是:

In the code above it would mean:

on_enter:
   button1.state = "down"
   button1.state = "normal"
   button2.state = "down"
   button2.state = "normal"
   button3.state = "down"
   button3.state = "normal"
   button4.state = "down"
   button4.state = "normal"

它可以工作...但是它不是很漂亮:|

It works ... but it is not pretty :|

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