Question

我正在使用kivy，我已将我的应用程序拆分为.py和.kv个文件。在.kv文件中，我创建了一个带有两个按钮和一个滑块的popup窗口：

<SettingsPopup>:
    cols:1
    Label:
        text: root.text
    GridLayout:
        cols: 2
        size_hint_y: None
        height: '44sp'

        Label:
            id: mylabel
            text: 'XXX'

        Slider:
            value: 50
            max: 10
            on_value: root.dispatch('on_brightness', args[1])

        Button:
            text: 'Yes'
            on_release: root.dispatch('on_settings','yes')
        Button:
            text: 'No'
            on_release: root.dispatch('on_settings', 'no')

我将on_settings事件绑定到python方法，它们按预期工作，即打印字符串。

以下是SettingsPopup类：

class SettingsPopup(GridLayout):
    text = StringProperty()
    a = NumericProperty(1.0)
    def __init__(self, **kwargs):
        self.register_event_type('on_settings')
        self.register_event_type('on_brightness')
        super(SettingsPopup, self).__init__(**kwargs)

    def on_settings(self, *args):
        pass

    def on_brightness(self, *args):
        pass

以及另一个类中用于测试功能的方法：

def settings(self, *largs):
    content = SettingsPopup(text='Please edit the experimental settings')
    content.bind(on_settings=self._on_settings)
    content.bind(on_settings=self._on_brightness)
    self.popup = Popup(title="Experimental Settings",
                       content=content,
                       size_hint=(None, None),
                       size=(200, 200),
                       auto_dismiss=False)
    self.popup.open()

def _on_settings(self, instance, answer):
    print "USER Name: ", repr(answer)
    self.popup.dismiss()

def _on_brightness(self, instance, answer):
    print "Brightness Level: ", repr(answer)
    self.popup.dismiss()

描述按钮的代码基于SO的另一个例子，我没有参考。但是，我尝试将其扩展为滑块，但on-brightness永远不会触发。我尝试添加a = NumericProperty(1.0)，但它没有效果。

我开始在on_value: print(args[1])文件中使用.kv，当我移动滑块时打印出来，所以我知道该事件有效，但我无法在python中调用该事件。

Kivy Slider on_value：事件未解雇

0 个答案: