public override bool OnTouchEvent(MotionEvent ev)
{
MotionEventActions action = ev.Action;
if (mReturningToStart && action == MotionEventActions.Down)
{
mReturningToStart = false;
}
if (!Enabled || mReturningToStart || canChildScrollUp())
{
// Fail fast if we're not in a state where a swipe is possible
return(false);
}
switch (action)
{
case MotionEventActions.Down:
mActivePointerId = ev.GetPointerId(0);
mIsBeingDragged = false;
break;
case MotionEventActions.Move:
int pointerIndex = ev.FindPointerIndex(mActivePointerId);
if (pointerIndex < 0)
{
Log.Error(LOG_TAG, "Got ACTION_MOVE event but have an invalid active pointer id.");
return(false);
}
float y = ev.GetY(pointerIndex);
float overscrollTop = (y - mInitialMotionY) * DRAG_RATE;
if (mIsBeingDragged)
{
mProgress.showArrow(true);
float originalDragPercent = overscrollTop / mTotalDragDistance;
if (originalDragPercent < 0)
{
return(false);
}
float dragPercent = System.Math.Min(1f, System.Math.Abs(originalDragPercent));
float adjustedPercent = (float)System.Math.Max(dragPercent - .4, 0) * 5 / 3;
float extraOS = System.Math.Abs(overscrollTop) - mTotalDragDistance;
float slingshotDist = mUsingCustomStart ? mSpinnerFinalOffset
- mOriginalOffsetTop : mSpinnerFinalOffset;
float tensionSlingshotPercent = System.Math.Max(0,
System.Math.Min(extraOS, slingshotDist * 2) / slingshotDist);
float tensionPercent = (float)((tensionSlingshotPercent / 4) - System.Math.Pow(
(tensionSlingshotPercent / 4), 2)) * 2f;
float extraMove = (slingshotDist) * tensionPercent * 2;
int targetY = mOriginalOffsetTop
+ (int)((slingshotDist * dragPercent) + extraMove);
// where 1.0f is a full circle
if (mCircleView.Visibility != ViewStates.Visible)
{
mCircleView.Visibility = ViewStates.Visible;
}
if (!mScale)
{
ViewCompat.SetScaleX(mCircleView, 1f);
ViewCompat.SetScaleY(mCircleView, 1f);
}
if (overscrollTop < mTotalDragDistance)
{
if (mScale)
{
setAnimationProgress(overscrollTop / mTotalDragDistance);
}
if (mProgress.Alpha > STARTING_PROGRESS_ALPHA &&
!isAnimationRunning(mAlphaStartAnimation))
{
// Animate the alpha
startProgressAlphaStartAnimation();
}
float strokeStart = adjustedPercent * .8f;
mProgress.setStartEndTrim(0f, System.Math.Min(MAX_PROGRESS_ANGLE, strokeStart));
mProgress.setArrowScale(System.Math.Min(1f, adjustedPercent));
}
else
{
if (mProgress.Alpha < MAX_ALPHA &&
!isAnimationRunning(mAlphaMaxAnimation))
{
// Animate the alpha
startProgressAlphaMaxAnimation();
}
}
float rotation = (-0.25f + .4f * adjustedPercent + tensionPercent * 2) * .5f;
mProgress.setProgressRotation(rotation);
setTargetOffsetTopAndBottom(targetY - mCurrentTargetOffsetTop,
true /* requires update */);
}
break;
//case MotionEventActions.Down:
// int index = ev.ActionIndex;
// mActivePointerId = ev.GetPointerId(index);
// break;
case MotionEventActions.PointerUp:
onSecondaryPointerUp(ev);
break;
case MotionEventActions.Up:
case MotionEventActions.Cancel:
{
if (mActivePointerId == INVALID_POINTER)
{
if (action == MotionEventActions.Up)
{
Log.Error(LOG_TAG, "Got ACTION_UP event but don't have an active pointer id.");
}
return(false);
}
int pointerIndex0 = ev.FindPointerIndex(mActivePointerId);
float y0 = ev.GetY(pointerIndex0);
float overscrollTop0 = (y0 - mInitialMotionY) * DRAG_RATE;
mIsBeingDragged = false;
if (overscrollTop0 > mTotalDragDistance)
{
setRefreshing(true, true /* notify */);
}
else
{
// cancel refresh
mRefreshing = false;
mProgress.setStartEndTrim(0f, 0f);
IAnimationListener listener = null;
if (!mScale)
{
listener = new CustomCancelListener(this);
}
animateOffsetToStartPosition(mCurrentTargetOffsetTop, listener);
mProgress.showArrow(false);
}
mActivePointerId = INVALID_POINTER;
return(false);
}
}
return(true);
}
public override bool OnTouchEvent(MotionEvent ev)
{
var action = ev.Action;
if (_returningToStart && action == MotionEventActions.Down)
{
_returningToStart = false;
}
if (!Enabled || _returningToStart || CanChildScrollUp())
{
// Fail fast if we're not in a state where a swipe is possible
return(false);
}
switch (action)
{
case MotionEventActions.Down:
_activePointerId = ev.GetPointerId(0);
_isBeingDragged = false;
break;
case MotionEventActions.Move:
var pointerIndex = ev.FindPointerIndex(_activePointerId);
if (pointerIndex < 0)
{
Log.Error(LogTag, "Got ACTION_MOVE event but have an invalid active pointer id.");
return(false);
}
var y = ev.GetY(pointerIndex);
var overscrollTop = (y - _initialMotionY) * DragRate;
if (_isBeingDragged)
{
_progress.ShowArrow(true);
var originalDragPercent = overscrollTop / _totalDragDistance;
if (originalDragPercent < 0)
{
return(false);
}
var dragPercent = System.Math.Min(1f, System.Math.Abs(originalDragPercent));
var adjustedPercent = (float)System.Math.Max(dragPercent - .4, 0) * 5 / 3;
var extraOS = System.Math.Abs(overscrollTop) - _totalDragDistance;
var slingshotDist = _usingCustomStart
? _spinnerFinalOffset
- OriginalOffsetTop
: _spinnerFinalOffset;
var tensionSlingshotPercent = System.Math.Max(0,
System.Math.Min(extraOS, slingshotDist * 2) / slingshotDist);
var tensionPercent = (float)((tensionSlingshotPercent / 4) - System.Math.Pow(
(tensionSlingshotPercent / 4), 2)) * 2f;
var extraMove = (slingshotDist) * tensionPercent * 2;
var targetY = OriginalOffsetTop
+ (int)((slingshotDist * dragPercent) + extraMove);
// where 1.0f is a full circle
if (_circleView.Visibility != ViewStates.Visible)
{
_circleView.Visibility = ViewStates.Visible;
}
if (!_scale)
{
ViewCompat.SetScaleX(_circleView, 1f);
ViewCompat.SetScaleY(_circleView, 1f);
}
if (overscrollTop < _totalDragDistance)
{
if (_scale)
{
SetAnimationProgress(overscrollTop / _totalDragDistance);
}
if (_progress.Alpha > StartingProgressAlpha &&
!IsAnimationRunning(_alphaStartAnimation))
{
// Animate the alpha
StartProgressAlphaStartAnimation();
}
var strokeStart = adjustedPercent * .8f;
_progress.SetStartEndTrim(0f, System.Math.Min(MaxProgressAngle, strokeStart));
_progress.SetArrowScale(System.Math.Min(1f, adjustedPercent));
}
else
{
if (_progress.Alpha < MaxAlpha &&
!IsAnimationRunning(_alphaMaxAnimation))
{
// Animate the alpha
StartProgressAlphaMaxAnimation();
}
}
var rotation = (-0.25f + .4f * adjustedPercent + tensionPercent * 2) * .5f;
_progress.SetProgressRotation(rotation);
SetTargetOffsetTopAndBottom(targetY - _currentTargetOffsetTop,
true /* requires update */);
}
break;
//case MotionEventActions.Down:
// int index = ev.ActionIndex;
// mActivePointerId = ev.GetPointerId(index);
// break;
case MotionEventActions.PointerUp:
OnSecondaryPointerUp(ev);
break;
case MotionEventActions.Up:
case MotionEventActions.Cancel:
{
if (_activePointerId == InvalidPointer)
{
if (action == MotionEventActions.Up)
{
Log.Error(LogTag, "Got ACTION_UP event but don't have an active pointer id.");
}
return(false);
}
var pointerIndex0 = ev.FindPointerIndex(_activePointerId);
var y0 = ev.GetY(pointerIndex0);
var overscrollTop0 = (y0 - _initialMotionY) * DragRate;
_isBeingDragged = false;
if (overscrollTop0 > _totalDragDistance)
{
SetRefreshing(true, true /* notify */);
}
else
{
// cancel refresh
_refreshing = false;
_progress.SetStartEndTrim(0f, 0f);
IAnimationListener listener = null;
if (!_scale)
{
listener = new CustomCancelListener(this);
}
AnimateOffsetToStartPosition(_currentTargetOffsetTop, listener);
_progress.ShowArrow(false);
}
_activePointerId = InvalidPointer;
return(false);
}
}
return(true);
}