Hi, On Mon, Jan 24, 2011 at 01:04:35PM -0800, Bill Spitzak wrote: > Chase Douglas wrote: > >Heh, I've heard his distaste of grabs. I haven't had a chance to > >research other mechanisms, so I'm just going on what I know through X. > >I'm certainly not opposed to a better mechanism :). > > I really believe passive grabs can be replaced by adding an API that > says "I did not handle this event". It can then be passed to another > window. The typical grabber would be the *last* one in line, not the > first. Wayland itself would have simple unchangable rules about what > windows receive events, but these rules produce a list and it tries > each in turn. > > Grabs have the unfortunate problem that the grabber cannot change > it's mind, and grabs must always be obscure key combinations and > sequences to avoid the chance that they will interfere with some > program.
Er, grabs do have that ability: see the ReplayPointer and ReplayKeyboard arguments to XAllowEvents. The problem with that is that you're introducing latency: you're sending the event through the X server to app A, which rejects it and asks the X server to pass it on to app B, which rejects it and asks the X server to pass it on to app C, etc. The X server is probably busy doing a million other things, so the latency stacks up quite badly. Cheers, Daniel
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