Hi, On Wed, Mar 02, 2011 at 10:58:08AM +0000, Daniel Stone wrote: > On Tue, Feb 22, 2011 at 10:06:37AM -0500, Chase Douglas wrote: > > +In order to prevent touch events delivered to one window while pointer > > events > > +are implicitly grabbed by another, all touches from indirect devices will > > end > > +when an implicit grab is activated on the slave or attached master device. > > New > > +touches may begin while the device is implicitly grabbed. > > This bit makes me _nervous_. Unfortunately we can only activate one > pointer grab at a time, but I'd rather do something like this: > * populate the window set with the pseudocode described near the top > when the touch begins, regardless of the pointer state > * generate touch events as normal > * if ownership is passed to a pointer grab/selection, skip it if > a pointer grab is already active on the delivering device (the MD > if the selection was on the MD ID or XIAllMasterDevices, otherwise > the SD)
Let me clarify a bit. Assume we have the following scenario:
* root window R, touch grab by gesture recogniser
* window manager frame window W, pointer button 1 grab for
click-to-raise
* client window C, touch selection
If we do a two-finger scroll on C, we'll get the following:
- touch 1 down, owned by R
- touch 2 down, owned by R
- touch 1 rejected by R, ownership passed to W, touch 2 ended before R
can reject it!
- touch 1 rejected by W, ownership passed to C
- touch 1 physically ends
- touch 2 physically ends
This means C will never see the scroll. If we just ignore the pointer,
we will skip straight from R to C if R rejects it: if C selects for
unowned events, it will at least know that touch 1 is still owned by
someone above it in the window tree who hasn't decided what to do with
it yet, and can wait to perform gesture recognition.
Cheers,
Daniel
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