問題描述

我想在我的復選框中添加一個畫布來更改它們的顏色.我找到了這個答案，但我正在努力實現它.我的復選框是使用以下代碼在 python 中創建的:

I would like to add a canvas to my checkboxes to change their color. I have found this answer, but I am struggling to implement it. My checkboxes are created in python with this code:

checkb= CheckBox()
layout.add_widget(checkb)

嘗試 1:我嘗試了 這里但沒有成功:

Attempt 1: I tried the solution from here but without success:

checkb= CheckBox()
checkb.canvas.add(Color(1., 1., 0))
checkb.canvas.add(Rectangle(size=(50, 50)))
layout.add_widget(checkb)

嘗試 2:我還嘗試在構建器中創建一個自定義復選框，但沒有找到使其工作的方法(我找不到有關這種設置的任何信息，所以我不確定甚至可以讓它工作):

Attempt 2: I also tried to come up with a custom checkbox created in the builder but didn't find a way to make it work (I couldn't find any info about this kind of setup, so I am not sure it's even possible to make it work):

Builder.load_string('''
<CustomCk@CheckBox>:
    canvas.before:
        Color:
            rgb: 1,0,0
        Rectangle:
            pos:self.center_x-8, self.center_y-8
            size:[16,16]
        Color:
            rgb: 0,0,0
        Rectangle:
            pos:self.center_x-7, self.center_y-7
            size:[14,14]                

''')

和

checkb= CustomCk()
layout.add_widget(checkb)

<小時>

我嘗試使用 with 語句:

Edit : my try with the with statement:

checkb= CheckBox()  
with checkb.canvas:
    Color(1, 2, 0)
    Rectangle(size=(50, 50))
layout.add_widget(checkb)

推薦答案

你應該使用 Python 代碼中的 with 語句

You should use the with statement from your python code

with checkb.canvas:
    Color(1., 1., 0)
    Rectangle(size=(50, 50))

您的其他方法似乎更好，只需稍微修復一下:

Your other approach seems better, just fix it a bit:

Builder.load_string('''
<CustomCk>:
    canvas.before:
        Color:
            rgb: 1,0,0
        Rectangle:
            pos:self.center_x-8, self.center_y-8
            size:[16,16]
        Color:
            rgb: 0,0,0
        Rectangle:
            pos:self.center_x-7, self.center_y-7
            size:[14,14]                

    ''')

class CustomCk(CheckBox): #define the class in the python file... 
     pass

checkb= CustomCk()
layout.add_widget(checkb)

這篇關于Kivy:如何將畫布用于在 python 中創建的小部件的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！