It is not clear to me, how one can bind/unbind signal or event observer.

For example. I need to load a page. Page load took time.
When I start loading, I bind observer to work finish event/signal. Then, when work is done - I want to unbind observer. Then, I might need to load page again.

The nearest I found in the doc - is Observer.Detach() . But how to bind it again, is not clear to me.

And the second question - when the event queue clears?
How, for example, I can implement observer to left AND right mouse click (or double click)?
There will be definitely some delay between left and right MOUSE_DOWN event