protected internal override void HandleInProgressEvent(MotionEventActions actionCode, MotionEvent
evt)
{
switch (actionCode)
{
case MotionEventActions.Up:
case MotionEventActions.Cancel:
{
mListener.OnMoveEnd(this);
ResetState();
break;
}
case MotionEventActions.Move:
{
UpdateStateByEvent(evt);
// Only accept the event if our relative pressure is within
// a certain limit. This can help filter shaky data as a
// finger is lifted.
if (mCurrPressure / mPrevPressure > PressureThreshold)
{
bool updatePrevious = mListener.OnMove(this);
if (updatePrevious)
{
mPrevEvent.Recycle();
mPrevEvent = MotionEvent.Obtain(evt);
}
}
break;
}
}
}
/// <summary>
/// Called when the current event occurred when a gesture IS in progress. The
/// handling in this implementation may set the gesture out of progress.
/// </summary>
/// <param name="actionCode">Action code.</param>
/// <param name="e">E.</param>
protected override void HandleInProgressEvent(MotionEventActions actionCode, MotionEvent e)
{
if (e.PointerCount > 1)
{
switch (actionCode)
{
case MotionEventActions.PointerDown:
// At least the second finger is on the screen now.
ResetState();
_previousEvent = MotionEvent.Obtain(e);
_timeDelta = 0;
UpdateStateByEvent(e);
// See if we have a sloppy gesture.
_sloppyGesture = this.IsSloppyGesture(e);
if (!_sloppyGesture)
{
// No, start gesture now.
_gestureInProgress = _listener.OnRotateBegin(this);
}
break;
case MotionEventActions.Move:
if (!_sloppyGesture)
{
break;
}
// See if we still have a sloppy gesture
_sloppyGesture = this.IsSloppyGesture(e);
if (!_sloppyGesture)
{
_gestureInProgress = _listener.OnRotateBegin(this);
}
break;
case MotionEventActions.PointerUp:
if (!_sloppyGesture)
{
break;
}
break;
}
}
else
{ // the gesture has to stop!
_gestureInProgress = false;
_listener.OnRotateEnd(this);
ResetState();
}
}
protected internal override void HandleStartProgressEvent(MotionEventActions actionCode, MotionEvent
evt)
{
switch (actionCode)
{
case MotionEventActions.PointerDown:
{
// At least the second finger is on screen now
ResetState();
// In case we missed an UP/CANCEL event
mPrevEvent = MotionEvent.Obtain(evt);
mTimeDelta = 0;
UpdateStateByEvent(evt);
// See if we have a sloppy gesture
mSloppyGesture = IsSloppyGesture(evt);
if (!mSloppyGesture)
{
// No, start gesture now
mGestureInProgress = mListener.OnRotateBegin(this);
}
break;
}
case MotionEventActions.Move:
{
if (!mSloppyGesture)
{
break;
}
// See if we still have a sloppy gesture
mSloppyGesture = IsSloppyGesture(evt);
if (!mSloppyGesture)
{
// No, start normal gesture now
mGestureInProgress = mListener.OnRotateBegin(this);
}
break;
}
case MotionEventActions.PointerUp:
{
if (!mSloppyGesture)
{
break;
}
break;
}
}
}
protected internal virtual void UpdateStateByEvent(MotionEvent curr)
{
MotionEvent prev = mPrevEvent;
// Reset mCurrEvent
if (mCurrEvent != null)
{
mCurrEvent.Recycle();
mCurrEvent = null;
}
mCurrEvent = MotionEvent.Obtain(curr);
// Delta time
mTimeDelta = curr.EventTime - prev.EventTime;
// Pressure
mCurrPressure = curr.GetPressure(curr.ActionIndex);
mPrevPressure = prev.GetPressure(prev.ActionIndex);
}
protected override void HandleStartProgressEvent(MotionEventActions actionCode, MotionEvent e)
{
switch (actionCode)
{
case MotionEventActions.PointerUp:
// Gesture ended but
UpdateStateByEvent(e);
if (!_sloppyGesture)
{
_listener.OnRotateEnd(this);
}
ResetState();
break;
case MotionEventActions.Cancel:
if (!_sloppyGesture)
{
_listener.OnRotateEnd(this);
}
ResetState();
break;
case MotionEventActions.Move:
UpdateStateByEvent(e);
// Only accept the event if our relative pressure is within
// a certain limit. This can help filter shaky data as a
// finger is lifted.
if (_currentPressure / _previousPressure > PressureThreshold)
{
bool updatePrevious = _listener.OnRotate(this);
if (updatePrevious)
{
if (_previousEvent != null)
{
_previousEvent.Recycle();
}
_previousEvent = MotionEvent.Obtain(e);
}
}
break;
}
}
/// <summary>
/// Called when the current event occurred when NO gesture is in progress
/// yet. The handling in this implementation may set the gesture in progress
/// or out of progress.
/// </summary>
/// <param name="actionCode">Action code.</param>
/// <param name="e">The event.</param>
protected override void HandleStartProgressEvent(MotionEventActions actionCode, MotionEvent e)
{
switch (actionCode)
{
case MotionEventActions.Down:
ResetState(); // In case we missed an UP/CANCEL event
_previousEvent = MotionEvent.Obtain(e);
_timeDelta = 0;
UpdateStateByEvent(e);
break;
case MotionEventActions.Move:
_gestureInProgress = _listener.OnMoveBegin(this);
break;
}
}
/// <summary>
/// Called when the current event occurred when NO gesture is in progress
/// yet. The handling in this implementation may set the gesture in progress
/// or out of progress.
/// </summary>
/// <param name="actionCode">Action code.</param>
/// <param name="e">The event.</param>
protected override void HandleStartProgressEvent(MotionEventActions actionCode, MotionEvent e)
{
switch (actionCode)
{
case MotionEventActions.Down:
ResetState(); // In case we missed an UP/CANCEL event
_firstEventTime = e.EventTime;
_previousEvent = MotionEvent.Obtain(e);
_timeDelta = 0;
_gestureInProgress = true;
_x = e.GetX();
_y = e.GetY();
UpdateStateByEvent(e);
break;
case MotionEventActions.Move:
break;
}
}
protected internal override void HandleStartProgressEvent(MotionEventActions actionCode, MotionEvent
evt)
{
switch (actionCode)
{
case MotionEventActions.Down:
{
ResetState();
// In case we missed an UP/CANCEL event
mPrevEvent = MotionEvent.Obtain(evt);
mTimeDelta = 0;
UpdateStateByEvent(evt);
break;
}
case MotionEventActions.Move:
{
mGestureInProgress = mListener.OnMoveBegin(this);
break;
}
}
}
/// <summary>
/// Updates the current state with the given event.
/// </summary>
/// <param name="curr">The current event.</param>
protected virtual void UpdateStateByEvent(MotionEvent curr)
{
MotionEvent prev = _previousEvent;
// Reset _currentEvent.
if (_currentEvent != null)
{
_currentEvent.Recycle();
_currentEvent = null;
}
_currentEvent = MotionEvent.Obtain(curr);
// Delta time.
_timeDelta = 0;
if (prev != null)
{
_timeDelta = curr.EventTime - prev.EventTime;
// Pressure.
_previousPressure = prev.GetPressure(prev.ActionIndex);
}
_currentPressure = curr.GetPressure(curr.ActionIndex);
}