Ejemplo n.º 1
0
bool
WheelBlockState::AllowScrollHandoff() const
{
  // If we're in a wheel transaction, we do not allow overscroll handoff until
  // a new event ends the wheel transaction.
  return !IsTargetConfirmed() || !InTransaction();
}
Ejemplo n.º 2
0
void
WheelBlockState::Update(const ScrollWheelInput& aEvent)
{
  // We might not be in a transaction if the block never started in a
  // transaction - for example, if nothing was scrollable.
  if (!InTransaction()) {
    return;
  }

  // If we can't scroll in the direction of the wheel event, we don't update
  // the last move time. This allows us to timeout a transaction even if the
  // mouse isn't moving.
  //
  // We skip this check if the target is not yet confirmed, so that when it is
  // confirmed, we don't timeout the transaction.
  nsRefPtr<AsyncPanZoomController> apzc = GetTargetApzc();
  if (IsTargetConfirmed() && !apzc->CanScroll(aEvent)) {
    return;
  }

  // Update the time of the last known good event, and reset the mouse move
  // time to null. This will reset the delays on both the general transaction
  // timeout and the mouse-move-in-frame timeout.
  mLastEventTime = aEvent.mTimeStamp;
  mLastMouseMove = TimeStamp();
}
Ejemplo n.º 3
0
bool
CancelableBlockState::IsReadyForHandling() const
{
  if (!IsTargetConfirmed())
    return false;
  return mContentResponded || mContentResponseTimerExpired;
}
Ejemplo n.º 4
0
void
WheelBlockState::Update(ScrollWheelInput& aEvent)
{
  // We might not be in a transaction if the block never started in a
  // transaction - for example, if nothing was scrollable.
  if (!InTransaction()) {
    return;
  }

  // The current "scroll series" is a like a sub-transaction. It has a separate
  // timeout of 80ms. Since we need to compute wheel deltas at different phases
  // of a transaction (for example, when it is updated, and later when the
  // event action is taken), we affix the scroll series counter to the event.
  // This makes GetScrollWheelDelta() consistent.
  if (!mLastEventTime.IsNull() &&
      (aEvent.mTimeStamp - mLastEventTime).ToMilliseconds() > kScrollSeriesTimeoutMs)
  {
    mScrollSeriesCounter = 0;
  }
  aEvent.mScrollSeriesNumber = ++mScrollSeriesCounter;

  // If we can't scroll in the direction of the wheel event, we don't update
  // the last move time. This allows us to timeout a transaction even if the
  // mouse isn't moving.
  //
  // We skip this check if the target is not yet confirmed, so that when it is
  // confirmed, we don't timeout the transaction.
  RefPtr<AsyncPanZoomController> apzc = GetTargetApzc();
  if (IsTargetConfirmed() && !apzc->CanScroll(aEvent)) {
    return;
  }

  // Update the time of the last known good event, and reset the mouse move
  // time to null. This will reset the delays on both the general transaction
  // timeout and the mouse-move-in-frame timeout.
  mLastEventTime = aEvent.mTimeStamp;
  mLastMouseMove = TimeStamp();
}