How to Create a Window in CustomTkinter?

The CTk class creates the foundation of any CustomTkinter program. It generates the main application window. During the execution of a program, there should be only one instance of this class with a single call to the .mainloop() method, which starts the application. Additional windows are created using the CTkToplevel class.

Code Example:

Structure of a CustomTkinter Program Without a Class (Not Recommended):

import customtkinter

app = customtkinter.CTk()
app.geometry("600x500")
app.title("CTk example")

# ... program ...

app.mainloop()

Structure of a Simple Program With Classes (Recommended):

import customtkinter

# Main class
class App(customtkinter.CTk):
    def __init__(self):
        super().__init__()
        self.geometry("400x200")
        self.title("CTk Example")

        # Add widgets to the application
        self.button = customtkinter.CTkButton(self, command=self.button_click)
        self.button.grid(row=0, column=0, padx=20, pady=10)

    # Add methods to the application (function)
    def button_click(self):
        print("Button clicked")

# Initializing the App
app = App()
app.mainloop()

Arguments

fg_color - Background color of the window, tuple: (light_color, dark_color) or a single color.

Methods

.configure(attribute=value, ...)

All attributes can be configured and updated.
```
app.configure(fg_color='#4fa882')
```
.cget(attribute_name)

Pass the attribute name as a string to get its current value.
```
fg_color = app.cget("fg_color")
```
.title(string) - Sets the window title.
.geometry("geometry_string") - Defines the geometry and window position like: "<width>x<height>" or "<width>x<height>+<x_pos>+<y_pos>".
.minsize(width, height) - Sets the minimum window size.
.maxsize(width, height) - Sets the maximum window size.
.resizable(width, height) - Defines whether the width and/or height should be resizable with boolean values.
.after(milliseconds, command) - Executes the command after milliseconds without blocking the main loop.
.withdraw() - Hides the window and its icon. Restore it with .deiconify().
.iconify() - Iconifies the window. Restore it with .deiconify().
.deiconify() - Deiconifies the window.
.state() - Returns the window state: 'normal', 'iconic', or 'withdrawn'.

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