Re: [AD] [ alleg-Bugs-2431768 ] display field for mouse state

[Evert Glebbeek <eglebbk@xxxxxxxxxx>]

On 17 Dec 2008, at 08:13, Milan Mimica wrote:
> > By that you mean mouse input events, presumably. The distinction is
> > important.
>
> So which window is that?

The window the mouse is over. Which need not be the same as the  
foreground window, or the same as the window with keyboard focus.
In Windows, I think, these are always the same and there is one  
"foreground" windows. In OS X the foreground window is also the  
window that gets keyboard focus ("key window"), but it need not be  
the same as the window that is tracking the mouse.
In X11 the key window need not be the foreground window and neither  
needs to be the window that the mouse is on.
So really, the three should be kept logically distinct.

> In general, does the window request to
> receive mouse events or the OS chooses which window to send mouse
> input events to?

At least on OS X, the OS chooses which window to send mouse events to  
based on the tracking rectangle. I *think* (but should explicitly  
check) that if the tracking rectangle of two windows overlaps, the  
window getting mouse events is the top most window (the alternative  
being both windows get events, but I don't think that's what happens).

Evert