PySimpleGUI Tutorial #07: Creating a Window with Themes in Python

In this tutorial, we will be exploring PySimpleGUI’s window themes feature. PySimpleGUI allows you to customize the look and feel of your GUI application by applying different themes to your windows. This can help you create a more visually appealing and user-friendly interface for your application.

To get started, make sure you have PySimpleGUI installed. You can install it using pip:

pip install PySimpleGUI

Once you have PySimpleGUI installed, create a new Python file and import PySimpleGUI:

import PySimpleGUI as sg

Next, let’s create a simple window with a button that changes the theme of the window. Here is an example code snippet:

# Define the theme names
themes = sg.theme_list()

# Create a layout for the window
layout = [
    [sg.Text("Select a theme:")],
    [sg.Combo(themes, default_value="SystemDefault", key="Theme")],
    [sg.Button("Change Theme")],
]

# Create the window
window = sg.Window("PySimpleGUI Theme Tutorial", layout)

# Event loop
while True:
    event, values = window.read()

    if event == sg.WIN_CLOSED:
        break
    elif event == "Change Theme":
        new_theme = values["Theme"]
        sg.change_look_and_feel(new_theme)

# Close the window
window.close()

In this code snippet, we first get a list of available themes using the theme_list() function. We then create a simple layout with a Combo box that allows the user to select a theme, and a button that changes the theme of the window.

We create the window using the Window class and enter an event loop to handle user interactions. If the user selects a new theme and clicks the "Change Theme" button, we use the change_look_and_feel() function to apply the selected theme to the window.

You can run this code to see how the different themes change the look of the window. Experiment with different themes to find the one that best suits your application.

You can also create custom themes by providing a dictionary of custom settings to the change_look_and_feel() function. Here is an example:

custom_theme = {
    "BACKGROUND": "#f0f0f0",
    "TEXT": "#000000",
    "INPUT": "#ffffff",
    "TEXT_INPUT": "#000000",
    "SCROLL": "#002740",
    "BUTTON": ("#002740", "#ffffff"),
    "PROGRESS": ("#002740", "#ffffff"),
}

sg.change_look_and_feel(custom_theme)

In this example, we define a custom theme with specific colors for different elements of the window. You can customize the theme to match your application’s branding or design requirements.

That’s it for this tutorial! I hope you found it helpful in exploring PySimpleGUI’s window themes feature. Feel free to experiment with different themes and create your own custom themes to enhance the visual appeal of your GUI applications. Happy coding!