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Learn how to effectively change the mouse cursor in your `pySimpleGUI` applications during long-running processes without interrupting user experience.
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How to Change Mouse Cursor in pySimpleGUI While Processing Tasks

When developing applications with pySimpleGUI, you might encounter situations where you wish to change the mouse cursor to indicate a processing task. A common scenario is when a user clicks a button that triggers a long-running process, like generating a report. However, you might notice that the cursor does not change until after the processing is complete. This delay can create confusion for users, as they're unsure if the program is still working or if it's frozen. In this guide, we'll explore how to effectively change the mouse cursor while your code is still running, providing a smoother experience for users.

The Problem Explained

In many graphical user interface (GUI) frameworks, when you initiate a long task, changes to the interface (like cursor changes) may not take effect immediately. In pySimpleGUI, you might encounter the following scenario:

You call window.set_cursor("coffee_mug") to change the cursor to indicate that processing is taking place.

The cursor only changes after the processing code has completed, rendering it ineffective for user feedback.

For example, if you use the following code:

[[See Video to Reveal this Text or Code Snippet]]

The cursor change will not be reflected until after the long-running code block, which is not ideal.

The Solution: A Better Approach

To ensure that the cursor changes immediately upon triggering the long process, you can take advantage of the set_cursor() method more effectively. Here’s how to modify your code:

Step-by-Step Code Modification

Reference the Button Directly: Use the button's ID for the cursor change.

Call window.refresh(): This method helps in rendering the GUI updates immediately.

Use Sleep for Simulation (If Needed): When simulating a long process, you can use time.sleep() to mimic the waiting period.

Here's an updated version of the code:

[[See Video to Reveal this Text or Code Snippet]]

Key Points to Remember

Button ID Reference: By referencing window['Submit'], you're setting the cursor specifically for that button. This will automatically cover the entire window.

Timely Refreshing: The call to window.refresh() after setting the cursor is crucial. It forces pySimpleGUI to update the display before proceeding with the next line of code.

Long Processes: Use appropriate methods (like time.sleep() for simulating work) to represent your actual processing code.

Conclusion

Incorporating user feedback in your applications is vital for enhancing the user experience. By following the steps outlined above, you can effectively change the mouse cursor to indicate processing tasks in pySimpleGUI, ensuring your application remains intuitive and user-friendly. Always remember to consider user feedback when managing long processes in your applications.

For more tips on using pySimpleGUI and creating seamless user interfaces, stay tuned for our upcoming posts!