public async Task CheckLongTapAsync(int delay, long id)
{
await Task.Delay(delay);
if (touches.Count != 1)
{
return;
}
TouchInfo info = touches[id];
if (info == null)
{
return;
}
float diffX = Math.Abs(info.PreviousPoint.X - info.InitialPoint.X);
float diffY = Math.Abs(info.PreviousPoint.Y - info.InitialPoint.Y);
if (diffX < 5 && diffY < 5)
{
OnGestureRecognized(this, new TouchGestureEventArgs(id, TouchGestureType.LongTap, info.InitialPoint));
}
}
public void ProcessTouchEvent(long id, TouchActionType type, SKPoint location)
{
TouchInfo info;
switch (type)
{
case TouchActionType.Pressed:
//we only handle 2 fingers
if (touches.Count < 2)
{
touches.Add(id, new TouchInfo
{
InitialTime = DateTime.UtcNow,
InitialPoint = location,
PreviousPoint = location,
NewPoint = location
});
//check for LONGTAP
CheckLongTapAsync(Timings.longTapMilliseconds, id);
}
break;
case TouchActionType.Moved:
info = touches[id];
if (info == null)
{
break;
}
info.NewPoint = location;
if (touches.Count == 1)
{
//this is PAN
SKPoint diff = info.NewPoint - info.PreviousPoint;
OnGestureRecognized(this, new TouchGestureEventArgs(id, TouchGestureType.Pan, diff));
}
else if (touches.Count == 2)
{
//this is PINCH
TouchInfo info1 = touches.ElementAt(0).Value;
TouchInfo info2 = touches.ElementAt(1).Value;
SKPoint preDiff = new SKPoint(Math.Abs(info2.PreviousPoint.X - info1.PreviousPoint.X), Math.Abs(info2.PreviousPoint.Y - info1.PreviousPoint.Y));
SKPoint postDiff = new SKPoint(Math.Abs(info2.NewPoint.X - info1.NewPoint.X), Math.Abs(info2.NewPoint.Y - info1.NewPoint.Y));
SKPoint pinchData = postDiff - preDiff;
OnGestureRecognized(this, new TouchGestureEventArgs(id, TouchGestureType.Pinch, pinchData));
}
info.PreviousPoint = info.NewPoint;
break;
case TouchActionType.Released:
info = touches[id];
if (info == null)
{
break;
}
info.NewPoint = location;
if (touches.Count == 1)
{
SKPoint diff = info.NewPoint - info.InitialPoint;
if (Math.Abs(diff.X) < 5 && Math.Abs(diff.Y) < 5)
{
//check for TAP
TimeSpan timeDiff = DateTime.UtcNow - info.InitialTime;
if (timeDiff < TimeSpan.FromMilliseconds(Timings.shortTapMilliseconds))
{
OnGestureRecognized(this, new TouchGestureEventArgs(id, TouchGestureType.Tap, info.InitialPoint));
}
}
else
{
//check for SWIPE
SKPoint lastDiff = info.NewPoint - info.PreviousPoint;
if (Math.Abs(lastDiff.X) > 5 || Math.Abs(lastDiff.Y) > 5)
{
OnGestureRecognized(this, new TouchGestureEventArgs(id, TouchGestureType.Swipe, lastDiff));
}
}
}
touches.Remove(id);
break;
case TouchActionType.Cancelled:
touches.Remove(id);
break;
}
}