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()

字符串
类SimplePanel具有text_area。类FileChooserBoxLayout使用FileChooserIconView选择文件的路径。类MyTabbedPanel在TabbedPanel的帮助下聚合SimplePanel和FileChooserBoxLayout。
一个问题是将文件路径附加到text_area。如何做到这一点？
作为一个变体，我尝试使用类Mediator来集成两个类之间的这种可能性。下面是代码：

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.')

型
然后MyTabbedPanel必须用这样的方式进行校正：

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)

型
这一切都是为了获得可能性追加文件路径到text_area，但它不工作。有任何想法如何做到这一点？