Question

如何将data从RequestRecycleView传递到refresh_view_data？我尝试使用全局变量并在data中实例化RequestRecycleView，但仍然无法通过附加Observable refresh_view_data来触发data。当我返回RequestRecycleView作为根目录但我希望ScreenManager作为我的根目录时，它正在工作。

from kivy.config import Config
Config.set('graphics', 'multisamples', '0')
from random import sample
from string import ascii_lowercase
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import BooleanProperty
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior


kv = """
#:import FadeTransition kivy.uix.screenmanager.FadeTransition
ScreenManager:
    transition: FadeTransition()
    RequestsScreen:

<RequestRow@BoxLayout>

    size_hint_y: None
    orientation: 'vertical'
    row_index: id_row_index.text
    row_index:''
    pos: self.pos
    size: self.size
    Label:
        id: id_row_index 
        text: root.row_index


<RequestRecycleView@RecycleView>:               
    #id: rv
    viewclass: 'RequestRow'
    SelectableRecycleBoxLayout:
        default_size: None, dp(56)
        default_size_hint: 1, None
        size_hint_y: None
        height: self.minimum_height
        orientation: 'vertical'
        multiselect: True
        touch_multiselect: True

<RequestsScreen>
    name: 'RequestsScreen'
    BoxLayout:         
        orientation: 'vertical'
        Label: 
            text: 'recycle'
        RequestRecycleView:


"""

class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
                                 RecycleBoxLayout):
    ''' Adds selection and focus behaviour to the view. '''



class RequestRow(RecycleDataViewBehavior):
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''

        self.index = index
        self.row_index = str(index)
        self.row_content = data['text']
        return super(RequestRow, self).refresh_view_attrs(
            rv, index, data)

class ScreenManagement(ScreenManager):
    pass

class RequestRecycleView(RecycleView):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.data = []
        for r in range(30):
            row = {'text': ''.join(sample(ascii_lowercase, 6))}
            self.data.append(row)

class RequestsScreen(Screen):
    pass

Builder.load_string(kv)

sm = ScreenManagement()
sm.add_widget(RequestsScreen(name = 'requests'))


class TestApp(App):
    def build(self):
        return sm

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

Answer 1

通过修改

<RequestRow@BoxLayout>

    size_hint_y: None
    orientation: 'vertical'
    row_index: id_row_index.text
    row_index:''
    pos: self.pos
    size: self.size
    Label:
        id: id_row_index 
        text: root.row_index

到

<RequestRow@BoxLayout>
    text: 'abba'
    size_hint_y: None
    orientation: 'vertical'
    row_index: id_row_index.text
    row_index:''
    pos: self.pos
    size: self.size
    Label:
        id: id_row_index 
        text: self.parent.text

产生工作代码。请注意，data中的字典键应该是viewclass的属性。在text中添加的RequestRow属性提供了该属性，并且text: self.parent.text中的Label将文本（来自viewclass的文本放入了{{1 }}。另外，您可以替换以下行：

Label

仅：

Builder.load_string(kv)

sm = ScreenManagement()
sm.add_widget(RequestsScreen(name = 'requests'))

因为您的sm = Builder.load_string(kv)文件将kv指定为根对象。

将数据传递给refresh_view_attrs。蟒蛇。基维

1 个答案: