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List:       freedesktop-xorg
Subject:    Re: XComposite input redirection/transformation proposal
From:       Dennis Kasprzyk <onestone () opencompositing ! org>
Date:       2008-02-19 15:26:06
Message-ID: fpesdi$715$1 () ger ! gmane ! org
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Xavier Bestel wrote:

> On Mon, 2008-02-18 at 20:29 -0800, Keith Packard wrote:
>> You need full bijection between every window and the screen coordinate
>> space (expressed as nested bijections between windows and their
>> parents). Otherwise, grabs will have incorrect coordinates (making
>> selections and scrollbars work in 'odd' ways). Fixing drag&drop may also
>> be an adventure.
> 
> I fear it's not possible. Compositing managers allow windows to be
> displayed multiple times (e.g. once in the pager, once normally) and
> some allow even more weird multiple instances of the same window (take a
> look at Metisse). I'm sure one day they'll want to enable input on some
> or all of these instances, meaning bijection isn't an option.
> 
> You could hack around it: when grab starts, identify which instance it
> started from and limit redirection from there. So you'd need bijection
> only during grabs. But it may not always work.

In a previous mail to this thread I've proposed a way how to get "cloned"
windows (InputOnly redirection Windows) and the bijection. But the system
would be more complicated.

- Dennis

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