python - kivy python按钮行为on_press禁用

Question

我正在尝试使用 kivy 构建一个应用程序。我添加了关闭按钮，然后添加了 on_release。但是，按下按钮不起作用。

Python 代码:

import kivy
kivy.require('1.11.0')
from kivy.lang import Builder
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.label import Label
from kivy.uix.image import Image
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.behaviors import ButtonBehavior
from kivy.core.window import Window


Window.size = (350 * 1.5 , 600 * 1.5)
with open("./template.kv", encoding='utf8') as f:
    Builder.load_string(f.read())

class CloseButton(ButtonBehavior, Image):
    def __init__(self, **kwargs):
        super(CloseButton, self).__init__(**kwargs)
        self.source = './close_btn@2x.png'
    always_release = True

    def on_press(self):
        App.get_running_app().stop()

class Background(Screen):
    def __init__(self, **kwargs):
        super(Background, self).__init__(**kwargs)

class TemplateApp(App):
    def build(self):
        # title bar remove
        # Window.borderless = True
        sm = ScreenManager()
        sm.add_widget(Background(name='back'))
        return sm

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

基维代码:

<Background>:
    canvas:

        Rectangle:
            pos: self.pos
            size: self.size
            source: "background.png"
    Label:
        font_size: 12 * 1.5
        text: 'Template'
        font_name: './NotoSans-hinted/NotoSans-Regular.ttf'
        size_hint: (1.0, 1.0)
        halign: "left"
        valign: "top"
        color: 0.43568, 0.43568, 0.43568, 1
        text_size: root.width - (40 * 1.5), 583 * 1.5

    BoxLayout:
        size_hint: 1.9, 1.938
        CloseButton:
            id: close_btn

Answer 1

而不是

    def on_press(self):
        App.get_running_app().stop()

试试这个

self.on_press = App.get_running_app().stop()

好的，让我们试试这个:

from kivy.clock import Clock
...
class CloseButton(ButtonBehavior, Image):
    def __init__(self, **kwargs):
        super(CloseButton, self).__init__(**kwargs)
        self.source = './close_btn@2x.png'
    # no parentheses after method's name!
    self.on_press = self.closeapp

    def closeapp(self):
        Clock.schedule_once(App.get_running_app().stop())