What is the problem or limitation you are having?

I currently don't know when the window is getting resized, so I can't make adaptive decisions about how the content is being displayed unless I keep a background task continually "manually" checking. Example:

async def update_background_image(self, app, **kwargs):
	while True:
		if self.main_window.size[0] != self.background_image.width:
			new_image_size = (self.main_window.size[0], self.background_image.height)
			scaled_image = self.background_image.resize(new_image_size)
			self.background_image_view.image = scaled_image

		await asyncio.sleep(1)

Describe the solution you'd like

An on_change method in MainWindow.

This way, I can specify a function to be called only when the window has changed.

Describe alternatives you've considered

1. Keep doing it manually;
2. For the exemplified use case, it would be better if I was able to tell the image to adopt the window's width (or its box's width), so I wouldn't have to do any resizing.

Additional context

No response