Kivy：使用切换按钮更改另一个切换按钮的状态

Question

例如，在 Kivy 语言中：

<MainToggle@ToggleButton>:
    on_state: # something that will change the state of the sub-toggle

<SubToggle@ToggleButton>:
    on_state: self.background_color = 0,0,0,1 # the sub-toggle button changes color 

Answer 1

您可以使用 kivy id 系统引用其他小部件。观察以下代码：

from kivy.base import runTouchApp
from kivy.lang import Builder

runTouchApp(Builder.load_string("""
<MainToggle@ToggleButton>:

<SubToggle@ToggleButton>:
    on_state: self.background_color = 0,0,0,1 # the sub-toggle button changes color 

BoxLayout:
    MainToggle:
        id: my_toggle1 # an id allows us to refer to this widget
        text: "Main Toggle"
        # change the other toggle's state using its id 
        on_state: my_toggle2.state = "down" if my_toggle2.state == "normal" else "normal"
    SubToggle:
        id: my_toggle2
        text: "Sub Toggle"
            """))

这是一个极好的video 教程，它在一个实际示例中使用了 kivy id 系统。如果您对此有疑问，请回复。