CODEWITHSUNDEEP
pythontkinterkeyboard-eventstoplevel
EQNX
EQNX

Reputation: 161

Bind a keyboard event to a Tkinter child

I seek to bind a close window function to a Tkinter child window. I have been able to implement the binding process for the parent, but I am struggling to enact the binding implementation for the child window.

Using the example set out in this question I have attempted to bind the close function to the Escape key, without success nor an error message.

import tkinter as tk


def close(self):
    self.top.destroy()

class ChildWindow:
    def __init__(self, master):
        self.top = tk.Toplevel(master)
        self.frame = tk.Frame(self.top)
        self.frame.pack()

        self.frame.bind("<Escape>",lambda: close(self))        

        self.close_button = tk.Button(self.frame, text="Close", command=self.top.destroy)
        self.close_button.pack()

class MainWindow:
    def __init__(self, master):
        self.master = master
        self.frame = tk.Frame(self.master)

        self.about_button = tk.Button(self.frame, text="Open child window", command=self._open_child_window)
        self.about_button.pack()
        self.frame.pack()

    def _open_child_window(self):
        self.about_window = ChildWindow(self.master)

root = tk.Tk()
lf = MainWindow(root)
root.mainloop()

Upvotes: 1

Views: 684

Answers (1)

EQNX
EQNX

Reputation: 161

As per @stovfl's suggestion I changed the bind be an attribute of the root not the self.frame

This captured the keyboard event and successfully called the close(self) function. 

import tkinter as tk

def close(self):
    self.top.destroy()

class ChildWindow:
    def __init__(self, master):
        self.top = tk.Toplevel(master)
        self.frame = tk.Frame(self.top)
        self.frame.pack()

        root.bind("<Escape>",lambda event: close(self))        

        self.close_button = tk.Button(self.frame, text="Close", command=self.top.destroy)
        self.close_button.pack()

    def close(self, event=None):
        print("destroy arg")
        self.root.destroy()


class MainWindow:
    def __init__(self, master):
        self.master = master
        self.frame = tk.Frame(self.master)



        self.about_button = tk.Button(self.frame, text="Open child window", command=self._open_child_window)
        self.about_button.pack()
        self.frame.pack()

    def _open_child_window(self):
        self.about_window = ChildWindow(self.master)

root = tk.Tk()
lf = MainWindow(root)
root.mainloop()

Upvotes: 1

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