Question

我想在视频运行时禁用一个小部件，所以我创建了一个ScreenVideo类，我定义了一个layoutGrid，并在其中放置了带文件名的按钮。

当我调用on_press回调时，我得到的错误是：全局名称＆＃39; layoutGrid＆＃39;没有定义。

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

        root =  FloatLayout(size=(Window.width, Window.height))  
        layoutGrid = GridLayout(cols=1, row_force_default=True, row_default_height=70, size_hint_y=None)  
        layoutGrid .bind(minimum_height=layoutGrig.setter('height')) #for scroll 
        ....

        for filename in os.listdir(folder location):
            filename2 = filename.replace(".mp4", "")
            btn = Button(text=str(filename2), font_size='25sp', italic = True)
            btn.bind(on_release=self.callback)  #on_press
            layoutGrid.add_widget(btn)

    def callback(self, instance):
        ...
        layoutGrid.disabled = True

由于

Answer 1

使layoutGrid成为您实例的属性：

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

        root =  FloatLayout(size=(Window.width, Window.height))  
        self.layoutGrid = GridLayout(cols=1, row_force_default=True, row_default_height=70, size_hint_y=None)  
        self.layoutGrid.bind(minimum_height=self.layoutGrid.setter('height')) #for scroll 
        ....

        for filename in os.listdir(folder location):
            filename2 = filename.replace(".mp4", "")
            btn = Button(text=str(filename2), font_size='25sp', italic = True)
            btn.bind(on_release=self.callback)  #on_press
            self.layoutGrid.add_widget(btn)

    def callback(self, instance):
        ...
        self.layoutGrid.disabled = True

全球名称＆＃39; layoutGrid＆＃39;没有定义

1 个答案: