From d0449851d1233543c3133d77e0ab7233319cdf5f Mon Sep 17 00:00:00 2001 From: Chase Douglas Date: Tue, 17 Apr 2012 10:49:14 -0700 Subject: Create a new dix touch record for an emulated touch with no listeners As a special case, if a still physically active pointer emulated touch has no listeners and the device is explicitly grabbed for pointer events, create a new dix touch record for the grab only. This allows for clients to "hand off" grabs. For example, when dragging a window under compiz the window decorator sees the button press and then ungrabs the implicit grab. It then tells compiz to grab the device, and compiz then moves the window with the pointer motion. This is racy, but is allowed by the input protocol for pointer events when there are no other clients with a grab on the device. Signed-off-by: Chase Douglas Reviewed-by: Peter Hutterer --- Xi/exevents.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'Xi') diff --git a/Xi/exevents.c b/Xi/exevents.c index ae3652b68..c8bd222e9 100644 --- a/Xi/exevents.c +++ b/Xi/exevents.c @@ -1610,6 +1610,34 @@ ProcessTouchEvent(InternalEvent *ev, DeviceIntPtr dev) else ti = TouchFindByClientID(dev, touchid); + /* Under the following circumstances we create a new touch record for an + * existing touch: + * + * - The touch may be pointer emulated + * - An explicit grab is active on the device + * - The grab is a pointer grab + * + * This allows for an explicit grab to receive pointer events for an already + * active touch. + */ + if (!ti && type != ET_TouchBegin && emulate_pointer && + dev->deviceGrab.grab && !dev->deviceGrab.fromPassiveGrab && + (dev->deviceGrab.grab->grabtype == CORE || + dev->deviceGrab.grab->grabtype == XI || + !xi2mask_isset(dev->deviceGrab.grab->xi2mask, dev, XI_TouchBegin))) { + ti = TouchBeginTouch(dev, ev->device_event.sourceid, touchid, + emulate_pointer); + if (!ti) { + DebugF("[Xi] %s: Failed to create new dix record for explicitly " + "grabbed touchpoint %d\n", + dev->name, type, touchid); + return; + } + + TouchBuildSprite(dev, ti, ev); + TouchSetupListeners(dev, ti, ev); + } + if (!ti) { DebugF("[Xi] %s: Failed to get event %d for touchpoint %d\n", dev->name, type, touchid); -- cgit v1.2.3