private void HandlePointerReleased(object sender, PointerRoutedEventArgs e)
{
if (!_isPointerDown)
{
return;
}
RenderGrid.ReleasePointerCapture(e.Pointer);
_isPointerDown = false;
_isSwiping = false;
_sw0.Stop();
// If it is not a valid swipe no need to go further
if (_swipeDir == SwipeDirection.None)
{
return;
}
var currPoint = e.GetCurrentPoint(RenderGrid).Position;
if (currPoint.X.IsCloseTo(_swipeStartPoint.X))
{
return;
}
var currSwipeDir = currPoint.X > _swipeStartPoint.X ? SwipeDirection.Right : SwipeDirection.Left;
if (_swipeDir != currSwipeDir)
{
_revealPercent = _swipeDir == SwipeDirection.Left ? SwipeRightEnd : SwipeLeftEnd;
_currOffsetX = _swipeDir == SwipeDirection.Left ? MaxOffsetX : MinOffsetX;
}
else
{
// Since the user has completed interaction for the current swipe, check if it is a valid swipe.
// If yes, then animate the shape to its final destination otherwise animate to return to its
// initial location.
var diffX = Math.Abs(currPoint.X - _swipeStartPoint.X);
var swipePercent = Math.Min((float)(diffX * 2 / _rootSize.Width), 1f);
var isValidSwipe = (swipePercent > SwipeThreshold) ||
((_sw0.ElapsedMilliseconds < SwipeThresholdDuration.TotalMilliseconds) &&
((float)diffX > SwipeDistanceThreshold));
slideDirection = SlideDirection.RightToLeft;
var durationPercent = isValidSwipe ? (1 - swipePercent) : swipePercent;
_a0 = TimeSpan.FromMilliseconds(Math.Max(1, DefaultGeometryAnimDuration * durationPercent));
_a1 = TimeSpan.FromMilliseconds(Math.Max(1, DefaultOffsetAnimDuration * swipePercent));
switch (_swipeDir)
{
case SwipeDirection.Left:
_swipeStartX = swipePercent;
_startOffsetX = Lerp(MaxOffsetX, MinOffsetX, EaseOut(swipePercent));
if (isValidSwipe)
{
_swipeEndX = SwipeLeftEnd;
// Update to the next valid index
_nextLeftIndex = _selectedIndex <= 2 ? -1 : _selectedIndex - 1;
_nextRightIndex = _selectedIndex;
_endOffsetX = MinOffsetX;
}
else
{
_swipeEndX = SwipeRightEnd;
_endOffsetX = MaxOffsetX;
_nextLeftIndex = _swipeLeftIndex;
_nextRightIndex = _swipeRightIndex;
}
break;
case SwipeDirection.Right:
_swipeStartX = 1 - swipePercent;
_startOffsetX = Lerp(MinOffsetX, MaxOffsetX, EaseOut(swipePercent));
if (isValidSwipe)
{
_swipeEndX = SwipeRightEnd;
// Update to the next valid index
_nextLeftIndex = _selectedIndex;
_nextRightIndex = _selectedIndex >= MaxLayerCount ? -1 : _selectedIndex + 1;
_endOffsetX = MaxOffsetX;
}
else
{
_swipeEndX = SwipeLeftEnd;
_endOffsetX = MinOffsetX;
_nextLeftIndex = _swipeLeftIndex;
_nextRightIndex = _swipeRightIndex;
}
break;
}
_sw1.Start();
_sw2.Start();
}
}
