python - Kivy 按钮文本对齐 (halign) 不起作用

Question

我想在 Kivy 中使用 halign='left' 将按钮的文本向左对齐，但它不起作用并保持居中。

这是我的代码:

import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.properties import StringProperty
from kivy.properties import ObjectProperty

class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super(MyGrid, self).__init__(**kwargs)
        self.cols = 1

        for i in range (0,10):
            self.btn = Button(text=str(i),halign='left',background_color =(.3, .6, .7, 1))
            self.btn.bind(on_press=self.pressed)
            self.add_widget(self.btn)


    def pressed(self, instance):
        print ("Name:",instance.text)



class MyApp(App):
    def build(self):
        return MyGrid()


if __name__ == "__main__":
    MyApp().run()

Answer 1

根据documentation for halign :

This doesn’t change the position of the text texture of the Label(centered), only the position of the text in this texture. Youprobably want to bind the size of the Label to the texture_size or seta text_size.

因此，为了获得您想要的结果，您可以为 Button 定义一个扩展，按照上述文档的建议进行操作:

class MyButt(Button):
    pass

Builder.load_string('''
<MyButt>:
    halign: 'left'
    text_size: self.size
    background_color: (.3, .6, .7, 1)
''')

然后在您的 App 中使用该类:

class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super(MyGrid, self).__init__(**kwargs)
        self.cols = 1

        for i in range (0,10):
            self.btn = MyButt(text=str(i))
            self.btn.bind(on_press=self.pressed)
            self.add_widget(self.btn)