This change moves the cached window and application input state
into the handle objects themselves. It simplifies the dispatcher
somewhat because it no longer needs to fix up references to
transient InputWindow objects each time the window list is updated.
This change will also make it easier to optimize setInputWindows
to avoid doing a lot of redundant data copying. In principle, only
the modified fields need to be updated. However, for now we
continue to update all fields in unison as before.
It turns out that the input dispatcher was inappropriately retaining
pointers to InputWindow objects within the mWindows InputWindow
vector. This vector is copy-on-write so it is possible and the
item pointers to change if an editing operation is performed on
the vector when it does not exclusively own the underlying
SharedBuffer. This bug was uncovered by a previous change that
replaced calls to clear() and appendVector() with a simple use
of operator= which caused the buffer to be shared. Consequently
after editItemAt was called (which it shouldn't have, actually)
the buffer was copied and the cached InputWindow pointers became
invalid. Oops. This change fixes the problem.
Change-Id: I0a259339a6015fcf9113dc4081a6875e047fd425
This change implements two heuristics.
1. When events are older than 10 seconds, they are dropped.
2. If the application is currently busy processing an event and
the user touches a window belonging to a different application
then we drop the currently queued events so the other application
can start processing the gesture immediately.
Note that the system takes care of synthesizing cancelation events
automatically for any events that it drops.
Added some new handle types to allow the native dispatcher to
indirectly refer to the WindowManager's window state and app window
token. This was done to enable the dispatcher to identify the
application to which each window belongs but it also eliminates
some lookup tables and linear searches through the window list
on each key press.
Bug: 3224911
Change-Id: I9dae8dfe23d195d76865f97011fe2f1d351e2940
