bool GestureEventListener::MoveDistanceIsLarge()
{
const ParentLayerPoint start = mLastTouchInput.mTouches[0].mLocalScreenPoint;
ParentLayerPoint delta = start - mTouchStartPosition;
ScreenPoint screenDelta = mAsyncPanZoomController->ToScreenCoordinates(delta, start);
return (screenDelta.Length() > AsyncPanZoomController::GetTouchStartTolerance());
}
void Axis::UpdateWithTouchAtDevicePoint(ScreenCoord aPos, uint32_t aTimestampMs) {
// mVelocityQueue is controller-thread only
AsyncPanZoomController::AssertOnControllerThread();
if (aTimestampMs == mPosTimeMs) {
// This could be a duplicate event, or it could be a legitimate event
// on some platforms that generate events really fast. As a compromise
// update mPos so we don't run into problems like bug 1042734, even though
// that means the velocity will be stale. Better than doing a divide-by-zero.
mPos = aPos;
return;
}
float newVelocity = mAxisLocked ? 0.0f : (float)(mPos - aPos) / (float)(aTimestampMs - mPosTimeMs);
if (gfxPrefs::APZMaxVelocity() > 0.0f) {
ScreenPoint maxVelocity = MakePoint(gfxPrefs::APZMaxVelocity() * APZCTreeManager::GetDPI());
mAsyncPanZoomController->ToLocalScreenCoordinates(&maxVelocity, mAsyncPanZoomController->PanStart());
newVelocity = std::min(newVelocity, maxVelocity.Length());
}
mVelocity = newVelocity;
mPos = aPos;
mPosTimeMs = aTimestampMs;
// Limit queue size pased on pref
mVelocityQueue.AppendElement(std::make_pair(aTimestampMs, mVelocity));
if (mVelocityQueue.Length() > gfxPrefs::APZMaxVelocityQueueSize()) {
mVelocityQueue.RemoveElementAt(0);
}
}