bool
InputQueue::MaybeHandleCurrentBlock(CancelableBlockState *block,
const InputData& aEvent) {
if (block == CurrentBlock() && block->IsReadyForHandling()) {
const RefPtr<AsyncPanZoomController>& target = block->GetTargetApzc();
INPQ_LOG("current block is ready with target %p preventdefault %d\n",
target.get(), block->IsDefaultPrevented());
if (!target || block->IsDefaultPrevented()) {
return true;
}
UpdateActiveApzc(block->GetTargetApzc());
block->DispatchImmediate(aEvent);
return true;
}
return false;
}
void
InputQueue::ProcessQueue() {
APZThreadUtils::AssertOnControllerThread();
while (!mQueuedInputs.IsEmpty()) {
CancelableBlockState* curBlock = mQueuedInputs[0]->Block();
if (!curBlock->IsReadyForHandling()) {
break;
}
INPQ_LOG("processing input from block %p; preventDefault %d target %p\n",
curBlock, curBlock->IsDefaultPrevented(),
curBlock->GetTargetApzc().get());
RefPtr<AsyncPanZoomController> target = curBlock->GetTargetApzc();
// target may be null here if the initial target was unconfirmed and then
// we later got a confirmed null target. in that case drop the events.
if (target) {
if (curBlock->IsDefaultPrevented()) {
if (curBlock->AsTouchBlock()) {
target->ResetTouchInputState();
}
} else {
UpdateActiveApzc(target);
curBlock->DispatchEvent(*(mQueuedInputs[0]->Input()));
}
}
mQueuedInputs.RemoveElementAt(0);
}
if (CanDiscardBlock(mActiveTouchBlock)) {
mActiveTouchBlock = nullptr;
}
if (CanDiscardBlock(mActiveWheelBlock)) {
mActiveWheelBlock = nullptr;
}
if (CanDiscardBlock(mActiveDragBlock)) {
mActiveDragBlock = nullptr;
}
if (CanDiscardBlock(mActivePanGestureBlock)) {
mActivePanGestureBlock = nullptr;
}
}
void
InputQueue::ProcessInputBlocks() {
APZThreadUtils::AssertOnControllerThread();
do {
CancelableBlockState* curBlock = CurrentBlock();
if (!curBlock->IsReadyForHandling()) {
break;
}
INPQ_LOG("processing input block %p; preventDefault %d target %p\n",
curBlock, curBlock->IsDefaultPrevented(),
curBlock->GetTargetApzc().get());
RefPtr<AsyncPanZoomController> target = curBlock->GetTargetApzc();
// target may be null here if the initial target was unconfirmed and then
// we later got a confirmed null target. in that case drop the events.
if (!target) {
curBlock->DropEvents();
} else if (curBlock->IsDefaultPrevented()) {
curBlock->DropEvents();
target->ResetInputState();
} else {
UpdateActiveApzc(curBlock->GetTargetApzc());
curBlock->HandleEvents();
}
MOZ_ASSERT(!curBlock->HasEvents());
if (mInputBlockQueue.Length() == 1 && curBlock->MustStayActive()) {
// Some types of blocks (e.g. touch blocks) accumulate events until the
// next input block is started. Therefore we cannot remove the block from
// the queue until we have started another block. This block will be
// removed by SweepDeletedBlocks() whenever a new block is added.
break;
}
// If we get here, we know there are more touch blocks in the queue after
// |curBlock|, so we can remove |curBlock| and try to process the next one.
INPQ_LOG("discarding processed %s block %p\n", curBlock->Type(), curBlock);
mInputBlockQueue.RemoveElementAt(0);
} while (!mInputBlockQueue.IsEmpty());
}