从回收视图中将回收视图项目添加到另一个屏幕 - kivy

Question

我有两个屏幕。 MainScreen 和 Playlist。 MainScreen 添加了一个 RecycleView 方法来显示项目列表。这些项目是从文件夹名称（目录）创建的。我希望每个文件夹（目录）中的文件在 Playlist 屏幕上打开，具体取决于单击的目录名称。

我打算在用户离开屏幕后立即清除屏幕。

from kivymd.app import MDApp
from kivymd.uix.button import MDFlatButton, MDRectangleFlatButton
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.recycleview import RecycleView
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.uix.screen import MDScreen

from pathlib import Path, PurePath

# Music Path
storageLocation = Path.cwd()
if Path('Books').is_dir():
    storageLocation = Path.cwd() / 'Books'

class RecycleViewRow(BoxLayout):
    text = StringProperty()


class MainScreen(MDScreen):
    def __init__(self, **kwargs):
        super(MainScreen, self).__init__(**kwargs)

        booksdir = [f for f in storageLocation.iterdir() if f.is_dir()]
        self.children[0].data = [{'text': str(x), 'id': str(x)} for x in booksdir]
       # print(self.children[0].data)

class Playlist(MDScreen):
    def on_pre_enter(self, *args):
        self.ids.Box.clear_widgets()
        #self.ids.Box.add_widget(MDRectangleFlatButton(text="done", ))
        print(self.manager.ids)
        return


class Main(MDApp):
    def build(self):
        sm = ScreenManager()
        sm.add_widget(MainScreen(name='MainScreen'))
        sm.add_widget(Playlist(name='Playlist'))
        sm.add_widget(Test(name="Test"))
        return sm  
Main().run()

.kv

<RecycleViewRow>:
    orientation: 'vertical'

    Button:
        text: root.text
        #on_press: app.root.message_box(root.text)
        on_release:app.root.current = 'Playlist'

<MainScreen>:


    RecycleView:
        id: rv
        viewclass: 'RecycleViewRow'
        RecycleBoxLayout:
            default_size: None, dp(56)
            default_size_hint: 1, None
            size_hint_y: None
            height: self.minimum_height
            orientation: 'vertical'


<Playlist>
    BoxLayout:
        orientation: 'vertical'
        id:Box

    

Answer 1

您可以从您的RecycleViewRow 触发一个方法，如下所示：

<RecycleViewRow>:
    orientation: 'vertical'

    Button:
        text: root.text
        on_release: app.fill_playlist(root.text)

然后，fill_playlist() 方法。你可以填写PlayList:

def fill_playlist(self, dir):
    self.root.current = 'Playlist'  # this also clears the play list
    playlist = self.root.get_screen('Playlist')
    for sub in os.listdir(dir):
        playlist.ids.Box.add_widget(MDRectangleFlatButton(text=sub))