Question

我需要在 Drop-Down 中设置动态列表。对于设置，我想使用类 DiscDropDown 的构造函数，它是类 DropDown 的后代。（这意味着，要在类 DiscDropDown 中为变量 li_disc 设置值）。这个类的实例不是python代码的一部分，因为我使用 Builder 。我如何在下一个代码中实现它？

    Builder.load_string('''

    <Save_As>:
        drop_down: drop_down
        orientation:'vertical'

        DiscDropDown:
            id: drop_down
            size_hint: None,None
            height: 50

        Button:
            id: bt_delete_file
            disabled: False
            size_hint: 1,None
            height: 250

            text: 'Fictive'

    ''')

    class DiscDropDown(DropDown):
        def __init__(self, **kwarg):
            super(DiscDropDown, self).__init__(**kwarg)

            self.dropdown = DropDown()

# I wanted to set up value Button.text during creation Buttons
            for name in li_disc:
                btn = Button(text = name, size_hint_y=None, height=44)
                btn.bind(on_release=lambda btn: self.dropdown.select(btn.text))
                self.dropdown.add_widget(btn)

            mainbutton = Button(text='Disc', size_hint=(None, None),size = (50,50))
            mainbutton.bind(on_release = self.dropdown.open)
            self.dropdown.bind(on_select=lambda instance, x: setattr(mainbutton, 'text', x))
            self.add_widget(mainbutton)


    class Save_As(BoxLayout):
     #   drop_down = ObjectProperty()
        def __init__(self, **kwargs):
            super(Save_As, self).__init__( **kwargs)


            return

    class ExplorerApp(App):

        def build(self):

            self.save_as = Save_As()

            return self.save_as

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

为了解决我的问题，我使用了下一个过程来设置值变量 Button.text ：

class Save_As(BoxLayout):
    drop_down = ObjectProperty()
    def __init__(self, **kwargs):
        li_disc = ['aa','bb','cc']
        super(Save_As, self).__init__( **kwargs)

#       I set up Button.text here
        for i in range(0,3):
            self.children[1].dropdown.children[0].children[i].text = li_disc[i]

        return

我认为我的解决方案并不理想，你能推荐我更好的流程吗？

Kivy：如何设置项目Drop-Down

0 个答案: