Customization, events, and ticking.

[0x57e11a]

I have 3 questions

1. Customization
   How could I customize the window more? I'd like to add things to the title bar area (for example, chrome has tabs in there), and be able to make custom minimize, maximize, and close buttons.
   I don't think making a custom implementation of the whole title bar functionality would be a good idea, just redoing the visuals.

2. Events
   How can I listen to events? Specifically I'd like to listen to events like minimize, maximize, window switching, window resizing, close attempt (I'd like to intercept the close event, so I'm using exit_on_close_request: false, but I don't know how to listen to that event).

3. Ticking
   I'd like to have a timer that ticks 40 times a second, I've seen the clock example, but I only want to re-draw the UI when something actually needs to, so not on every tick.