python - 如何获取 Kivy TextInput 或 Label 的字符宽度

Question

我在 Kivy 中有一个包含长内容的 TextInput。我想知道 TextInput 的字符宽度。换句话说，线条的长度？

textinput = TextInput(text="Open source Python library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps")

Answer 1

您可以使用 _lines 属性检查 TextInput 的行。要获得它们的长度，请使用 len() 内置函数:

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

from kivy.lang import Builder

Builder.load_string("""

<MyWidget>:
    Button:
        text: "Print width"
        on_press: print([len(line) for line in ti._lines])
    TextInput
        text: "Open source Python library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps"
        id: ti
""")

class MyWidget(BoxLayout):
    pass

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

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