如何在Kivy框架的TabbedPanel上让两个类之间交互？

问：

有三个类：

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.checkbox import CheckBox
from kivy.uix.label import Label
from kivy.uix.scrollview import ScrollView
from kivy.uix.tabbedpanel import TabbedPanel, TabbedPanelItem, TabbedPanelHeader
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from kivy.uix.filechooser import FileChooserIconView


class SimplePanel(BoxLayout):
    def __init__(self, **kwargs):
        super(SimplePanel, self).__init__(**kwargs)
        self.text_area = TextInput()
        self.add_widget(self.text_area)
        self.text_area.text += f'Hello, SimplePanel\n'


class FileChooserBoxLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(FileChooserBoxLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'
        self.file_chooser = FileChooserIconView(path='.', filters=['*'])
        self.add_widget(self.file_chooser)
        self.save_button = Button(text='Save', on_release=self.save_file, size_hint=(1, None), height=70) #
        self.add_widget(self.save_button)
        self.save_path = None
    
    def save_file(self, instance):
        selected_file = self.file_chooser.selection and self.file_chooser.selection[0]
        if selected_file:
            self.save_path = selected_file
            print(f'Saving file: {self.save_path}')
        else:
            print('No file selected.')
    
    def get_save_path(self):
        return self.save_path


class MyTabbedPanel(TabbedPanel):
    def __init__(self, **kwargs):
        super(MyTabbedPanel, self).__init__(**kwargs)
        
        self.tab_width = 200
        self.default_tab_text = 'Panel 1'
        self.default_tab_content = Label(text='Hello, World!')

        simple_panel = SimplePanel()
        filechooserboxlayout = FileChooserBoxLayout()
        
        tab2 = TabbedPanelHeader(text='Panel 2')
        tab2.content = simple_panel
        
        tab3 = TabbedPanelHeader(text='Panel 3')
        tab3.content = filechooserboxlayout

        tab4 = TabbedPanelHeader(text='Panel 4')
        content4 = Label(text='Content of Panel 4')
        tab4.content = content4

        # Add the panels to the TabbedPanel
        self.add_widget(tab2)
        self.add_widget(tab3)
        self.add_widget(tab4)


class MyApp(App):
    def build(self):
        return MyTabbedPanel()


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

该类具有 .该类使用 选择文件的路径。该类在 的帮助下聚合了 和。SimplePaneltext_areaFileChooserBoxLayoutFileChooserIconViewMyTabbedPanelSimplePanelFileChooserBoxLayoutTabbedPanel

一个问题是将文件路径附加到 .怎么做？text_area

作为一个变体，我尝试使用一个类来集成两个类之间的这种可能性。代码如下：Mediator

class Mediator:
    def __init__(self, simple_panel, file_chooser_box_layout):
        self.simple_panel = simple_panel
        self.file_chooser_box_layout = file_chooser_box_layout
        self.file_chooser_box_layout.save_button.bind(on_release=self.update_text_area)
    
    def update_text_area(self, instance):
        print('Hello, World!!!')
        save_path = self.file_chooser_box_layout.get_save_path()
        if save_path:
            self.simple_panel.text_area.text += f'{save_path}\n'
        else:
            print('No file selected.')

然后必须用这样的方式纠正：MyTabbedPanel

class MyTabbedPanel(TabbedPanel):
    def __init__(self, **kwargs):
        super(MyTabbedPanel, self).__init__(**kwargs)
        
        self.tab_width = 200
        self.default_tab_text = 'Panel 1'
        self.default_tab_content = Label(text='Hello, World!')

        simple_panel = SimplePanel()
        filechooserboxlayout = FileChooserBoxLayout()
        mediator = Mediator(simple_panel, filechooserboxlayout)
        
        tab2 = TabbedPanelHeader(text='Panel 2')
        tab2.content = mediator.simple_panel
        
        tab3 = TabbedPanelHeader(text='Panel 3')
        tab3.content = mediator.file_chooser_box_layout

        tab4 = TabbedPanelHeader(text='Panel 4')
        content4 = Label(text='Content of Panel 4')
        tab4.content = content4

        # Add the panels to the TabbedPanel
        self.add_widget(tab2)
        self.add_widget(tab3)
        self.add_widget(tab4)

这一切都是为了有可能将文件路径附加到 但它不起作用。 有什么想法怎么做吗？text_area