private bool OnTouchMove(global::Android.Views.MotionEvent e)
{
if (base.ViewGroup != null)
{
int width = base.ViewGroup.Width;
int height = base.ViewGroup.Height;
if ((e.GetX() < 0) || (e.GetY() < 0) || (e.GetX() >= width) || (e.GetY() >= height))
{
this.cancelTouch = true;
if (base.Element != null)
{
((PressedView)base.Element).SetPressed(false);
}
}
}
return(true);
}
public void OnTouchEvent(global::Android.Views.MotionEvent e, CanvasContent content)
{
if (content == null)
{
throw new ArgumentNullException("content");
}
if (e == null)
{
throw new ArgumentNullException("e");
}
var began = new List <CanvasTouch> ();
var moved = new List <CanvasTouch> ();
var ended = new List <CanvasTouch> ();
var cancelled = new List <CanvasTouch> ();
var pointerCount = e.PointerCount;
var actionMasked = e.Action & global::Android.Views.MotionEventActions.Mask;
var actionIndex = (int)(e.Action & global::Android.Views.MotionEventActions.PointerIdMask) >> (int)global::Android.Views.MotionEventActions.PointerIdShift;
var actionId = e.GetPointerId(actionIndex);
//Log.WriteLine("a = {0}, index = {1}, id = {2}, c = {3}", actionMasked, actionIndex, actionId, pointerCount);
switch (actionMasked)
{
case global::Android.Views.MotionEventActions.Move:
for (var index = 0; index < pointerCount; index++)
{
var id = e.GetPointerId(index);
if (id < MaxTouchId)
{
var t = _activeTouches[id];
if (t != null)
{
var curSuperLoc = t.SuperCanvasLocation;
var newSuperLoc = new System.Drawing.PointF(e.GetX(index), e.GetY(index));
var dx = curSuperLoc.X - newSuperLoc.X;
var dy = curSuperLoc.Y - newSuperLoc.Y;
if (t.IsMoving ||
(Math.Abs(dx) > _initialMoveResolution ||
Math.Abs(dy) > _initialMoveResolution) ||
NumActiveTouches > 1)
{
t.SuperCanvasPreviousLocation = t.SuperCanvasLocation;
t.CanvasPreviousLocation = t.CanvasLocation;
t.PreviousTime = t.Time;
t.IsMoving = true;
t.SuperCanvasLocation = newSuperLoc;
t.CanvasLocation = LocationFromView(t.SuperCanvasLocation);
t.Time = DateTime.UtcNow;
moved.Add(t);
_longClickToken = -1;
}
}
}
}
break;
case global::Android.Views.MotionEventActions.Down:
case global::Android.Views.MotionEventActions.PointerDown:
if (actionId < MaxTouchId)
{
var t = new AndroidTouch {
Handle = new IntPtr(actionId + 1), // +1 because IntPtr=0 is special
SuperCanvasLocation = new System.Drawing.PointF(e.GetX(actionIndex), e.GetY(actionIndex)),
Time = DateTime.UtcNow,
TapCount = 1,
};
t.CanvasLocation = LocationFromView(t.SuperCanvasLocation);
t.CanvasPreviousLocation = t.CanvasLocation;
t.SuperCanvasPreviousLocation = t.SuperCanvasLocation;
t.PreviousTime = t.Time;
began.Add(t);
_activeTouches[actionId] = t;
//
// Detect double tap
//
if ((t.Time - _lastBeganTime).TotalMilliseconds <= _doubleTapTimeoutMillis &&
Math.Abs(_lastBeganLocation.X - t.SuperCanvasLocation.X) <= _doubleTapResolution &&
Math.Abs(_lastBeganLocation.Y - t.SuperCanvasLocation.Y) <= _doubleTapResolution)
{
t.TapCount = 2;
}
else
{
//
// Detect long press
//
if (NumActiveTouches == 1)
{
var tok = _longClickTokenGenerator.Next();
_handler.PostDelayed(() => { HandleLongClick(tok, content); }, _longClickTimeoutMillis);
_longClickToken = tok;
}
else
{
_longClickToken = -1;
}
}
_lastBeganTime = t.Time;
_lastBeganLocation = t.SuperCanvasLocation;
}
break;
case global::Android.Views.MotionEventActions.Up:
case global::Android.Views.MotionEventActions.PointerUp:
if (actionId < MaxTouchId)
{
var t = _activeTouches[actionId];
if (t != null)
{
t.Time = DateTime.UtcNow;
_activeTouches[actionId] = null;
ended.Add(t);
}
_longClickToken = -1;
}
break;
}
if (began.Count > 0)
{
content.TouchesBegan(began.ToArray(), CanvasKeys.None);
}
if (moved.Count > 0)
{
content.TouchesMoved(moved.ToArray());
}
if (ended.Count > 0)
{
content.TouchesEnded(ended.ToArray());
}
if (cancelled.Count > 0)
{
content.TouchesCancelled(cancelled.ToArray());
}
}
