tree 764dfd933c0a80c42fd4214f375c456e6370e548
parent d00e68c3b6a4c727bd59a7e7c4524fb3fdd193f0
author Svetoslav <svetoslavganov@google.com> 1413305666 -0700
committer Svetoslav <svetoslavganov@google.com> 1413927953 -0700

APIs for an accessibility service to put interaction tracking overlays.

An accessibility service may register to observe the interactive windows
on the primary display. These windows are the one that has input focus and
ones a sighted user can touch. It is sometimes beneficial for an
accessibility service to overlay a window to intercept user interaction
and based on that introspect and perform an action on the windows that
are on the screen. This is problematic as overlaying a full screen window
that is touchable prevents the accessibility service to introspect the
content under this window.

This change adds a special type of window that only an accessibility service
can place which does not affect what an accessibility service can "see" on
the screen. Hence, even putting such a window full screen the service will
be able to interact with the other interactive windows it covers.

Change-Id: I053ccc3a5c6360a98dc40bdb172b54dab35d8b31