[Xevie] Re: Invitation to a discussion about an External Event Manager

[Deron Johnson]

Deron wrote:

>>Could you explain further what this feature would be used for?
> 

Keith Packard wrote:

> X has a long history of ensuring that operations 'respect' the window 
> tree; reparenting, substructure-override, backing store, grabs and many 
> other operations permit arbitrary nesting of windows.  In fact, there are 
> very few "root specific" operations.  
> 
> When I wrote a 'pseudo root' extension (see http://keithp.com/~keithp/
> talks), I had to touch very few lines within the X server to completely
> replace the root window for clients.
> 
> So, I'd like to make sure we can nest these event redirections just as 
> we can currently nest Composite rendering redirections.  I think the best 
> way to do that is to effectively process redirections 'top down', looking 
> down the sprite trace for an event redirection and breaking out to deliver 
> the event where redirection occurs.  Applications can then re-insert the 
> event with arbitrary coordinates directed at an arbitrary window, at which 
> point the event distribution will start at that window and work downwards.

Can you describe what types of applications would take advantage of this 
feature?