Tkinter Toplevel

In Python’s Tkinter library, the Toplevel widget is used to create and display independent windows that are managed directly by the window manager. These windows can either exist with or without a parent window above them. The Toplevel widget is useful for pop-ups, additional information windows, and grouping related widgets in a separate window.

Toplevel windows come with standard window elements such as title bars, borders, and other decorations provided by the operating system.

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Syntax

The basic syntax for creating a Toplevel window is:

w = Toplevel(options)

Options

The Toplevel widget provides several configuration options to customize the appearance and behavior of the window:

SN	Option	Description
1	bg	Sets the background color of the window.
2	bd	Defines the border size of the window.
3	cursor	Changes the mouse pointer when hovered over the window.
4	class_	Controls whether selected text is exported to the window manager. Setting it to 0 disables this behavior.
5	font	Defines the font type of text inside the widget.
6	fg	Sets the foreground color of the window.
7	height	Specifies the window height.
8	relief	Defines the border style of the window.
9	width	Specifies the window width.

Methods

The Toplevel widget also provides several methods to control its functionality:

SN	Method	Description
1	deiconify()	Displays the window if it was previously minimized.
2	frame()	Returns a system-dependent window identifier.
3	group(window)	Adds this window to a specific group.
4	iconify()	Minimizes the window.
5	protocol(name, function)	Assigns a function to a specific protocol event.
6	state()	Returns the current state of the window (e.g., normal, iconic, withdrawn).
7	transient([master])	Makes the window a transient (temporary) window.
8	withdraw()	Hides the window without destroying it.
9	maxsize(width, height)	Sets the maximum window size.
10	minsize(width, height)	Sets the minimum window size.
11	positionfrom(who)	Specifies the controller for window positioning.
12	resizable(width, height)	Controls whether the window can be resized.
13	sizefrom(who)	Specifies the controller for window sizing.
14	title(string)	Sets the window title.

Example: Creating a New Window using Toplevel

Here’s a simple example demonstrating how to create a new Toplevel window in Tkinter:

from tkinter import *  

root = Tk()  
root.geometry("200x200")  

def open_window():  
    new_window = Toplevel(root)  
    new_window.title("New Window")  
    new_window.geometry("150x150")  

btn = Button(root, text="Open", command=open_window)  
btn.place(x=75, y=50)  

root.mainloop()

Output:

When the button is clicked, a new pop-up window will appear with a specified title and dimensions.

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Conclusion

The Toplevel widget in Tkinter is a powerful tool for managing additional windows in a Python GUI application. Whether you need a pop-up notification, a settings window, or a separate display area, Toplevel provides a simple and effective way to manage multiple windows within your application.

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