How do you detect / stop someone from closing the sketch?

[what42]

I want to have some code run before the sketch is closed, but I don’t know how to detect when the window itself has been closed by clicking its x. I’d also be okay with making the window borderless, but I can’t find a way to do that either. If nothing else works, I could just have it always be fullscreened, but I’d like to have it be windowed too. If anyone knows how to detect closing / make it borderless, please let me know.

Edit: hold on, I think I might have it

[micycle]

Save when app close, exit() ... stop()

Interesting. Try this then: public void dispose() { println("Print this when sketch is closed."); super.dispose(); }

[what42]

@Save when app close

public void dispose() {
  println("Print this when sketch is closed.");
  super.dispose();
}

That worked! Thank you so much!