如何在Kivy ScrollView中滾動GridLayout？

Question

目前，這是我的KV代碼不是滾動：

BoxLayout: 
    id: bl 
    orientation: 'vertical' 
    padding: 10, 10 
    row_default_height: '48dp' 
    row_force_default: True 
    spacing: 10, 10 

    GridLayout: 
     id: layout_content 
     cols: 1 
     row_default_height: '20dp' 
     row_force_default: True 
     spacing: 0, 0 
     padding: 0, 0 

     Label: 
      text: 'You don''t have any downloads. Please add new download from Home screen' 

你怎麼做上面的KV代碼滾動？我知道Kivy ScrollView只接受一個孩子，並且我已經讓GridLayout成爲新的ScrollView的子代。但它不起作用。任何建議？

Answer 1

根據您禁用了滾動的孩子size_hint中的至少一個documentation for ScrollView：

<Controller>: 
    layout_content: layout_content 
    BoxLayout: 
     id: bl 
     orientation: 'vertical' 
     padding: 10, 10 
     row_default_height: '48dp' 
     row_force_default: True 
     spacing: 10, 10 
     ScrollView: 
      size: self.size 
      GridLayout: 
       id: layout_content 
       size_hint_y: None 
       cols: 1 
       row_default_height: '20dp' 
       row_force_default: True 
       spacing: 0, 0 
       padding: 0, 0 

       Label: 
        text: "Lorem ipsum dolor sit amet" 

，並綁定佈局的尺寸使自己適應：

# main.py 

class Controller(FloatLayout): 
    layout_content=ObjectProperty(None) 

    def __init__(self, **kwargs): 
     super(Controller, self).__init__(**kwargs) 
     self.layout_content.bind(minimum_height=self.layout_content.setter('height'))