Question

我在使用ScollView Widget时遇到了一些问题，试图让动态生成的标签堆栈可滚动。我可能误解了ScrollView的使用方式，所以我希望有人可以为我澄清一下。下面的代码从csv读取一堆数据，当显示该代码时，如果有大量数据，程序将基本上尝试将所有文本/标签压缩到GridLayout中。我希望数据可滚动。这是代码的抽象版本：

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

    self.my_data = read_csv_to_dict()
    self.data_exists = 0 if len(self.my_data) == 0 else 1 

    ### Create Widgets ###      
    layout_main = BoxLayout(orientation = 'vertical')
    layout_back_button = BoxLayout(padding = [0, 0, 0, 20])
    self.layout_data = GridLayout(cols = 3 if self.data_exists else 1)  
    self.scrollview_data = ScrollView()

    button_back = Button(text = 'Main menu')

    ### Add widgets ###
    self.add_widget(layout_main)
    layout_main.add_widget(layout_back_button)
    layout_main.add_widget(self.scrollview_data)

    layout_back_button.add_widget(button_back)

    if self.data_exists:
        self.layout_data.add_widget(Label(text = 'label 1'))
        self.layout_data.add_widget(Label(text = 'label 2'))
        self.layout_data.add_widget(Label(text = 'label 3'))
        self.display_data(self)
        self.scrollview_data.add_widget(self.layout_data)
    else:
        self.scrollview_data.add_widget(Label(text = 'Records are empty'))

    ### Create button bindings ###
    button_back.bind(on_press = switch_screen_to_main)      

def display_data(obj, self):

    data_dictReader = read_csv_to_dictReader()

    for data_row in data_dictReader:
        for value in data_row.values():
            self.layout_data.add_widget( Label( text = value))

GridLayout / data不可滚动。有人能告诉我如何修复上面的代码使其可滚动？谢谢。

Answer 1

您的GridLayout上缺少a few things from the Kivy Documentation。它们是确保GridLayout“足够大以滚动”所必需的：

您必须确保将size_hint_y设置为None，因为在这种情况下默认1不方便
将minimum_height的{{1}}绑定到GridLayout。
确保layout.setter('height')的大小适合滚动

这个例子几乎就是你在文档中找到的：

ScrollView

在此示例中，from kivy.app import App from kivy.uix.scrollview import ScrollView from kivy.uix.gridlayout import GridLayout from kivy.uix.button import Button class Example(App): def build(self): layout = GridLayout(cols=1, spacing=10, size_hint_y=None) # Make sure the height is such that there is something to scroll. layout.bind(minimum_height=layout.setter('height')) for i in range(30): btn = Button(text=str(i), size_hint_y=None, height=40) layout.add_widget(btn) root = ScrollView() root.add_widget(layout) return root if __name__ == '__main__': Example().run()是ScrollView的大小，但您可以使用Window和size_hint属性对其进行操作。

ScrollView小部件不能在kivy中滚动

1 个答案: