How To Get Variables From Toplevel Window To Main Window?

I have a code that gets keyinputs and show it on a entrybox in the toplevel window of the main window. In the main window I have a listbox and I am wishing to get the keyinput that

Solution 1:

To get values from one class to another class you've to link them. Inheriting the Widgets directly to the class will help you a lot in establishing a connection between Tk() window and Toplevel() Window.

One more thing when a Keyboard window is already opened disable the button by configure state = 'disabled' so the user won't open another one by mistake and when Keyboard window is closed re-enable the button by state = 'normal'.

Here is the complete code:

import tkinter as tk
import tkinter.ttk as ttk

classEntryBox(tk.Entry):
    def__init__(self, master, cnf = {}, **kw):
        kw = tk._cnfmerge((kw, cnf))
        kw['justify'] = kw.get('justify', 'center')
        kw['width'] = 15
        kw['state'] = 'readonly'super(EntryBox, self).__init__(master=master, **kw)
        self.bind_class(self, '<Key>', self._display)

    def_display(self, evt):
        self['state'] = 'normal'
        self.delete('0', 'end')
        self.insert('0', str(evt.keysym))
        self['state'] = 'readonly'classKeyboard(tk.Toplevel):
    def__init__(self, master=None, cnf={}, **kw):
        super(Keyboard, self).__init__(master=master, cnf=cnf, **kw)
        self.master = master
        kb_frame = ttk.Frame(self)
        kb_frame.grid(column=0, row=1, pady=(7, 19))
        ttk.Label(kb_frame, text='Enter Key').grid(column=0, row=0, pady=4)
        self.entry = EntryBox(kb_frame)
        self.entry.grid(column=0, row=1)

        # This protocol calls the function when clicked on 'x' on titlebar
        self.protocol("WM_DELETE_WINDOW", self.Destroy)

        # Confirm button
        self.co_button = ttk.Button(self, text='Confirm', command=self.on_press)
        self.co_button.grid(column=0, row=2)

    defon_press(self):
        key = self.entry.get()
        # Condition to not have duplicate values, If you want to have duplicate values remove the conditionif key notin self.master.lb.get('0', 'end') and key:
            # Insert the Key to the listbox of mainwindow
            self.master.lb.insert('end', key)

    defDestroy(self):
        # Enable the button
        self.master.kb_button['state'] = 'normal'# Then destroy the window
        self.destroy()

classMain(tk.Tk):
    def__init__(self):
        super(Main, self).__init__()

        bt_frame = ttk.Frame(self)
        bt_frame.grid(column=2, row=0, rowspan=2)

        self.kb_button = ttk.Button(bt_frame, text='KeyBoard', command=self.on_press)
        self.kb_button.grid(column=0, row=0)

        self.lb = tk.Listbox(bt_frame)
        self.lb.grid(column=0, row=1)

    defon_press(self):
        # Creating a toplevel window and passed self as master parameter
        self.Kb = Keyboard(self)
        # Disabled the button
        self.kb_button['state'] = 'disabled'


main = Main()
main.mainloop()