How to modify `Text` of the parent from the children level in Tkinter (Python)-CodePudding

I got an app.py file where the main class App(Tk) is being invoked. Within it I create three children, with two being relevant (in the middle and on the right of the image):

    self.active_module = main_module.MainModule(self.main)
    self.active_module.grid(column=1,row=0)

and

    self.preview = Text(self.main,state='disabled',width=50)
    self.preview.grid(column=2,row=0,sticky=E)

The active_module is a ttk.Notebook with several ttk.Frame and separated as a main_module.py file. One of those frames got combobox with different values...

...and the question is how to let preview Text be modified upon changing the combobox value? For clarity purposes I also attach the image how it looks alike:

The relevant parts of code are as follows:

app.py

class App(Tk):
    def __init__(self):
        super().__init__()

        [...]

        self.active_module = main_module.MainModule(self.main)
        self.active_module.grid(column=1,row=0)

        self.preview = Text(self.main,state='disabled',width=50)
        self.preview.grid(column=2,row=0,sticky=E)

main_module.py

class MainModule(ttk.Notebook):
    def __init__(self,parent):
        super().__init__(parent)

        self.add(General(self),text="General")

class General(ttk.Frame):
    def __init__(self,parent):
        super().__init__(parent)

        self.runtype_label = ttk.Label(self,text="Runtype:")
        self.runtype_label.grid(column=0,row=0,sticky=W)
        self.runtype_combobox = ttk.Combobox(self,state="readonly",values=("1","2","3"),width=9)
        self.runtype_combobox.grid(column=1,row=0,sticky=W)
        #self.runtype_combobox.bind('<<ComboboxSelected>>',self.runtype_choice)

CodePudding user response：

You can pass a callback to MainModule class and then pass this callback to General class.

app.py

class App(Tk):
    def __init__(self):
        super().__init__()

        self.main = Frame(self)
        self.main.pack()

        # pass callback to MainModule class
        self.active_module = main_module.MainModule(self.main, self.insert_text) 
        self.active_module.grid(column=1, row=0)

        self.preview = Text(self.main, state='disabled', width=50)
        self.preview.grid(column=2, row=0, sticky=E)

    def insert_text(self, text):
        self.preview.config(state='normal')
        self.preview.insert('end', f'{text}\n')
        self.preview.config(state='disabled')

main_module.py

class MainModule(ttk.Notebook):
    def __init__(self, parent, callback):
        super().__init__(parent)

        # pass callback to 'General' class
        self.add(General(self, callback), text="General")

class General(ttk.Frame):
    def __init__(self, parent, callback):
        super().__init__(parent)

        self.runtype_label = ttk.Label(self, text="Runtype:")
        self.runtype_label.grid(column=0, row=0, sticky=W)
        self.runtype_combobox = ttk.Combobox(self, state="readonly", values=("1","2","3"), width=9)
        self.runtype_combobox.grid(column=1, row=0, sticky=W)
        # call the callback whenever item is selected
        self.runtype_combobox.bind('<<ComboboxSelected>>', lambda e: callback(self.runtype_combobox.get()))