Getting Mouse events and closest-to-cursor 1D curves

[kociak]

I am looking for the user to be able to select a curve (1D curve in a 1D display panel) with a click on it. I don't think this is implemented.
Trying to go one step lower, I tried to find a way to retrieve mouse events. The little I saw in the code was too confusing for me (like the MouseTrackingCanvasItem), but maybe I just need a minimal example for that.
As a general comment, it would be very nice to have a mouse_moved_event, mouse_clicked_event, mouse_released_event etc ... with modifiers, as can be found in other GUIs APIs, and even better would be to have it with a way to choose the coordinates (like, screen pixels, curve calibrated ...)