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How to create a child window and establish a connection with a parent in TkInter

I create some dialogs using TkInter and should be able to open a child child window (modal or non-modal) when a button is clicked in the parent. Then the child allowed the creation of a data record, and this data (either the record, or if the operation was canceled) must be transferred back to the parent window. So far I:

import sel_company_dlg

from Tkinter import Tk

def main():
    root = Tk()
    myCmp = sel_company_dlg.SelCompanyDlg(root)
    root.mainloop()

if __name__ == '__main__':
    main()

This brings up a top-level dialog that allows the user to select a company. The company selection dialog is as follows:

class SelCompanyDlg(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)
        self.parent_ = parent
        self.frame_ = Frame( self.parent_ )
        // .. more init stuff ..
        self.btNew_ = Button( self.frame_, text="New ...", command=self.onNew )

    def onNew(self):
        root = Toplevel()
        myCmp = company_dlg.CompanyDlg(root)

When you click the Create ... button , the Create Company dialog box appears, which allows the user to fill out company data and click on create or cancel. Here's the start bit of this:

class CompanyDlg(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)
        // etc.

onNew() - , , , , , .

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+5
2

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, GUI . , , mixin. , .

:

class ChildDialog(tk.Toplevel):
    def __init__(self, parent, app, ...)
        self.app = app
        ...
        self.ok_button = tk.Button(parent, ..., command=self.on_ok)
        ...
    def on_ok(self):
        # send the data to the parent
        self.app.new_data(... data from this dialog ...)

class MainApplication(tk.Tk):
    ...

    def on_show_dialog(self):
        dialog = ChildDialog(self)
        dialog.show()

    def new_data(self, data):
        ... process data that was passed in from a dialog ...

. , , .

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+7

tk.Toplevel(child1) (self), tk.Toplevel(child2) , (child2) .

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App(), "" App().

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():

import tkinter as tk
from tkinter import ttk
class App(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        top = self.winfo_toplevel()
        self.menuBar = tk.Menu(top)
        top['menu'] = self.menuBar
        self.menuBar.add_command(label='Child1', command=self.__create_child1)
        self.menuBar.add_command(label='Child2', command=lambda: self.__create_child2(True))
        self.TestLabel = ttk.Label(self, text='Use the buttons from the toplevel menu.')
        self.TestLabel.pack()
        self.__create_child2(False)

    def __create_child1(self):
        self.Child1Window = tk.Toplevel(master=self, width=100, height=100)
        self.Child1WindowButton = ttk.Button(self.Child1Window, text='Focus Child2 window else create Child2 window', command=self.CheckForChild2)
        self.Child1WindowButton.pack()

    def __create_child2(self, givenarg):
        self.Child2Window = tk.Toplevel(master=self, width=100, height=100)
        if givenarg == False:
            self.Child2Window.withdraw()
            # Init some vars or widgets
            self.Child2Window = None
        else:
            self.Child2Window.TestLabel = ttk.Label(self.Child2Window, text='This is Child 2')
            self.Child2Window.TestLabel.pack()

    def CheckForChild2(self):
        if self.Child2Window:
            if self.Child2Window.winfo_exists():
                self.Child2Window.focus()
            else:
                self.__create_child2(True)
        else:
            self.__create_child2(True)

if __name__ == '__main__':
    App().mainloop()

: , "child2" . : _tkinter.TclError:

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- winfo_exists() "child2" , "child1" , , .

( CheckForChild2):

    def CheckForChild2(self):
        if self.Child2Window:
            if self.Child1Window.master.Child2Window.winfo_exists():
                self.Child1Window.master.Child2Window.focus()
            else:
                self.__create_child2(True)
        else:
            self.__create_child2(True)
+2

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