python - 如何在单独的窗口中添加滚动视图？

Question

我想在我的 1 个屏幕和同一个屏幕上添加一个滚动视图。我想要一个重定向到主屏幕的按钮。下面显示的代码似乎不起作用。这是我的python代码（假设我已经导入了相关模块）：

class Main(Screen):
    pass
class View(Screen):
    view = ObjectProperty(Non    
   def __init__(self, **kwargs):
        super(View, self).__init__(**kwargs)
        Clock.schedule_once(self.create_scrollview)

    def create_scrollview(self, dt):
        base = ["element {}".format(i) for i in range(40)]
        layout = GridLayout(cols=1, spacing=10, size_hint_y=None)
        layout.bind(minimum_height=layout.setter("height"))

        for element in base:
            layout.add_widget(Button(text=element, size=(50, 50), size_hint=(1, None),background_color=(0.5, 0.5, 0.5, 1), color=(1, 1, 1, 1)))
        scrollview = ScrollView(size_hint=(1, None), size=(Window.width, Window.height))
        scrollview.add_widget(layout)
        self.view.add_widget(scrollview)

class Manager(ScreenManager): #transition of windows
    def __init__(self, **kwargs):
        super(Manager, self).__init__(**kwargs)
    pass
kv = Builder.load_file('main.kv')
class NotesApp(App):
    def build(self):
        return kv   
if __name__ == '__main__':
    NotesApp().run()

这是我的 kv 文件：

Manager:
    Main:
    View:

<Button>:
    font_size:35
<Label>:
    font_size:45
<Main>:
    name:'main'
<View>:
    name: 'view'
    FloatLayout: 
        Button:
            pos_hint:{'x':0.2,'top':0.975}
            size_hint:0.6,0.15
            text: 'Back'
            on_release:
                app.root.current = 'main'
                root.manager.transition.direction = 'right'

标签： pythonkivy

Answer 1

.kv 文件

• 添加id: view到FloatLayout:
• view: view在类规则下添加， <View>:。这是为了将 ObjecProperty 连接到 id。
• 添加id: btn_view到Button:
• 切换画面前先设置过渡方向

kv - 片段

<View>:
    name: 'view'
    view: view

    FloatLayout:
        id: view

        Button:
            id: btn_view
            pos_hint: {'x':0.2, 'top':0.975}
            size_hint: 0.6, 0.15
            text: 'Back'
            on_release:
                root.manager.transition.direction = 'right'
                root.manager.current = 'main'

Python 脚本

• 用 Button 小部件的高度减去 ScrollView 的高度

Python - 片段

        scrollview = ScrollView(size_hint=(1, None), size=(Window.width, Window.height - self.ids.btn_view.height),
                                bar_width=8, bar_color=[1, 0, 0, 1], bar_inactive_color=[0, 0, 1, 1],
                                effect_cls="ScrollEffect", scroll_type=['bars'])

输出