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specs: Rewrite Touch events delivery section

Browse source 
And add a fixme

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2011-03-18 15:10:34 +10:00
parent c883261f2b
commit 9c2817fd76
1 changed files with 16 additions and 13 deletions
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29
specs/XI2proto.txt
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@ -406,22 +406,25 @@ DependentTouch, IndependentPointer, and SemiMultitouch devices.
5.3 Touch event delivery
~~~~~~~~~~~~~~~~~~~~~~~~
Window sets for event propagation for direct device touches contain the windows
from the root to the child in which the touch originated.
For direct touch devices, the window set for event propagation is the set of
windows from the root window to the child in which the touch sequence
begins.
Indirect device window sets depend on whether other touches are active. For
the first touch on an indirect device, the window set contains the windows from
the root to the current window underneath the position of the device's pointer.
For subsequent touches on the device, the window set is identical to the window
set of the first touch. Once all touches have been released, the window set is
reset and re-calculated on the first subsequent touch.
For indirect devices, the window set for event propagation is the set of
windows from the root window to the window that contains the device's
pointer. An indirect device may only have one window set at a time. Any
future touch sequence will use the same window set. The window set is
cleared when all touch sequences on the device end.
The delivery of touch events is not changed by any modifications to the window
hierarchy after the window set has been determined for the touch, nor is it
affected by new grabs or selections.
A window set is calculated on TouchBegin and remains constant until the end
of the sequence Modifications to the window hierarchy, new grabs or changed
event selection do not affect the window set.
FIXME:
No touches from an indirect device may begin while the device is
floating, as it does not have an associated pointer position to focus
events. [incorrect, remove it? why would it matter]
No touches from an indirect device may begin while the device is floating, as
it does not have an associated pointer position to focus events.
5.3.1 Pointer event handling for indirect touch devices
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^