public bool onTouch(MotionEvent ev)
{
if (velocityTracker == null)
{
velocityTracker = VelocityTracker.Obtain();
}
velocityTracker.AddMovement(ev);
if (ev.Action == MotionEventActions.Down)
{
if (!scroller.IsFinished)
{
scroller.AbortAnimation();
}
isSmoothScrolling = false;
}
else if (ev.Action == MotionEventActions.Move)
{
velocityTracker.AddMovement(ev);
velocityTracker.ComputeCurrentVelocity(500);
}
else if (ev.Action == MotionEventActions.Up)
{
handleHorizontalScrolling();
velocityTracker.Recycle();
velocityTracker.Clear();
velocityTracker = null;
isScrolling = false;
}
return(false);
}
public override bool OnTouchEvent(MotionEvent ev)
{
if (ev.Action == MotionEventActions.Move)
{
tracker.AddMovement(ev);
}
if (ev.Action == MotionEventActions.Up)
{
tracker.ComputeCurrentVelocity(1000);
var velocity = tracker.XVelocity;
Console.WriteLine("Velocity: " + velocity);
tracker.Clear();
if (Math.Abs(velocity) > 1000)
{
timer = new System.Timers.Timer(125);
timer.Start();
timer.Elapsed += delegate
{
CallHandler();
timer.Stop();
timer.Dispose();
timer = null;
};
}
else
{
CallHandler();
}
}
return(base.OnTouchEvent(ev));
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
FindViewById(Android.Resource.Id.Content).SystemUiVisibility =
(StatusBarVisibility)(SystemUiFlags.LayoutStable | SystemUiFlags.LayoutFullscreen | SystemUiFlags.HideNavigation);
stiffness = FindViewById <SeekBar>(Resource.Id.stiffness);
damping = FindViewById <SeekBar>(Resource.Id.damping);
velocityTracker = VelocityTracker.Obtain();
View box = FindViewById(Resource.Id.box);
box.Touch += (sender, args) =>
{
switch (args.Event.Action)
{
case MotionEventActions.Down:
downX = args.Event.GetX();
downY = args.Event.GetY();
velocityTracker.AddMovement(args.Event);
break;
case MotionEventActions.Move:
box.TranslationX = args.Event.GetX() - downX;
box.TranslationY = args.Event.GetY() - downY;
velocityTracker.AddMovement(args.Event);
break;
case MotionEventActions.Up:
case MotionEventActions.Cancel:
velocityTracker.ComputeCurrentVelocity(1000);
if (box.TranslationX != 0)
{
SpringAnimation animX = new SpringAnimation(box, DynamicAnimation.TranslationX, 0);
animX.Spring.SetStiffness(Stiffness);
animX.Spring.SetDampingRatio(Damping);
animX.SetStartVelocity(velocityTracker.XVelocity);
animX.Start();
}
if (box.TranslationY != 0)
{
SpringAnimation animY = new SpringAnimation(box, DynamicAnimation.TranslationY, 0);
animY.Spring.SetStiffness(Stiffness);
animY.Spring.SetDampingRatio(Damping);
animY.SetStartVelocity(velocityTracker.YVelocity);
animY.Start();
}
velocityTracker.Clear();
break;
}
};
}
private void OnSecondaryPointerUp(MotionEvent ev)
{
#if DEBUG
Log.Verbose(Tag, "OnSecondaryPointerUp called");
#endif
var pointerIndex = MotionEventCompat.GetActionIndex(ev);
var pointerId = MotionEventCompat.GetPointerId(ev, pointerIndex);
if (pointerId == ActivePointerId)
{
var newPointerIndex = pointerIndex == 0 ? 1 : 0;
_lastMotionX = MotionEventCompat.GetX(ev, newPointerIndex);
ActivePointerId = MotionEventCompat.GetPointerId(ev, newPointerIndex);
if (VelocityTracker != null)
VelocityTracker.Clear();
}
}
private void OnSecondaryPointerUp(MotionEvent ev)
{
if (DEBUG)
{
Console.WriteLine(TAG + " OnSecondaryPointerUp called");
}
int pointerIndex = MotionEventCompat.GetActionIndex(ev);
int pointerId = MotionEventCompat.GetPointerId(ev, pointerIndex);
if (pointerId == mActivePointerId)
{
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX = MotionEventCompat.GetX(ev, newPointerIndex);
mActivePointerId = MotionEventCompat.GetPointerId(ev, newPointerIndex);
if (mVelocityTracker != null)
{
mVelocityTracker.Clear();
}
}
}
void OnSecondaryPointerUp(MotionEvent ev)
{
var pointerIndex = ((int)ev.Action & MotionEventCompat.ActionPointerIndexMask) >> MotionEventCompat.ActionPointerIndexShift;
var pointerId = MotionEventCompat.GetPointerId(ev, pointerIndex);
if (pointerId == mActivePointerId)
{
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
// TODO: Make this decision more intelligent.
int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mDownMotionX = MotionEventCompat.GetX(ev, newPointerIndex);
mDownMotionX = MotionEventCompat.GetY(ev, newPointerIndex);
mDownScrollX = ScrollX;
mActivePointerId = MotionEventCompat.GetPointerId(ev, newPointerIndex);
if (mVelocityTracker != null)
{
mVelocityTracker.Clear();
}
}
}
private void OnTouch(object sender, SKTouchEventArgs e)
{
// Save time, when the event occures
long ticks = DateTime.Now.Ticks;
var location = GetScreenPosition(e.Location);
if (e.ActionType == SKTouchAction.Pressed)
{
_firstTouch = location;
_touches[e.Id] = new TouchEvent(e.Id, location, ticks);
_velocityTracker.Clear();
// Do we have a doubleTapTestTimer running?
// If yes, stop it and increment _numOfTaps
if (_doubleTapTestTimer != null)
{
_doubleTapTestTimer.Dispose();
_doubleTapTestTimer = null;
_numOfTaps++;
}
else
{
_numOfTaps = 1;
}
e.Handled = OnTouchStart(_touches.Select(t => t.Value.Location).ToList());
}
if (e.ActionType == SKTouchAction.Released)
{
// Delete e.Id from _touches, because finger is released
var releasedTouch = _touches[e.Id];
_touches.Remove(e.Id);
double velocityX;
double velocityY;
(velocityX, velocityY) = _velocityTracker.CalcVelocity(e.Id, ticks);
// Is this a fling or swipe?
if (_touches.Count == 0)
{
if (velocityX > 10000 || velocityY > 10000)
{
// This was the last finger on screen, so this is a fling
e.Handled = OnFlinged(velocityX, velocityY);
}
// Do we have a tap event
if (releasedTouch == null)
{
e.Handled = false;
return;
}
// While tapping on screen, there could be a small movement of the finger
// (especially on Samsungs). So check, if touch start location isn't more
// than 2 pixels away from touch end location.
var isAround = Math.Abs(releasedTouch.Location.X - _firstTouch.X) < 2 && Math.Abs(releasedTouch.Location.Y - _firstTouch.Y) < 2;
// If touch start and end is in the same area and the touch time is shorter
// than longTap, than we have a tap.
if (isAround && ticks - releasedTouch.Tick < (e.DeviceType == SKTouchDeviceType.Mouse ? shortClick : longTap) * 10000)
{
// Start a timer with timeout delayTap ms. If than isn't arrived another tap, than it is a single
_doubleTapTestTimer = new System.Threading.Timer((l) =>
{
if (_numOfTaps > 1)
{
if (!e.Handled)
{
e.Handled = OnDoubleTapped(location, _numOfTaps);
}
}
else
if (!e.Handled)
{
e.Handled = OnSingleTapped((Geometries.Point)l);
}
_numOfTaps = 1;
if (_doubleTapTestTimer != null)
{
_doubleTapTestTimer.Dispose();
}
_doubleTapTestTimer = null;
}, location, UseDoubleTap ? delayTap : 0, -1);
}
else if (releasedTouch.Location.Equals(_firstTouch) && ticks - releasedTouch.Tick >= longTap * 10000)
{
if (!e.Handled)
{
e.Handled = OnLongTapped(location);
}
}
}
if (_touches.Count == 1)
{
e.Handled = OnTouchStart(_touches.Select(t => t.Value.Location).ToList());
}
if (!e.Handled)
{
e.Handled = OnTouchEnd(_touches.Select(t => t.Value.Location).ToList(), releasedTouch.Location);
}
}
if (e.ActionType == SKTouchAction.Moved)
{
_touches[e.Id] = new TouchEvent(e.Id, location, ticks);
if (e.InContact)
{
_velocityTracker.AddEvent(e.Id, location, ticks);
}
if (e.InContact && !e.Handled)
{
e.Handled = OnTouchMove(_touches.Select(t => t.Value.Location).ToList());
}
else
{
e.Handled = OnHovered(_touches.Select(t => t.Value.Location).FirstOrDefault());
}
}
if (e.ActionType == SKTouchAction.Cancelled)
{
_touches.Remove(e.Id);
}
if (e.ActionType == SKTouchAction.Exited)
{
}
if (e.ActionType == SKTouchAction.Entered)
{
}
}
private void OnTouch(object sender, SKTouchEventArgs e)
{
// Save time, when the event occures
long ticks = DateTime.Now.Ticks;
var location = GetScreenPosition(e.Location);
// Get finger/handler for this event
if (!_fingers.Keys.Contains(e.Id))
{
if (_fingers.Count < 10)
{
_fingers.Add(e.Id, _fingers.Count);
}
}
var id = _fingers[e.Id];
if (e.ActionType == SKTouchAction.Pressed)
{
_firstTouch = location;
_touches[id] = new TouchEvent(id, location, ticks);
_velocityTracker.Clear();
// Do we have a doubleTapTestTimer running?
// If yes, stop it and increment _numOfTaps
if (_doubleTapTestTimer != null)
{
_doubleTapTestTimer.Dispose();
_doubleTapTestTimer = null;
_numOfTaps++;
}
else
{
_numOfTaps = 1;
}
e.Handled = OnTouchStart(_touches.Select(t => t.Value.Location).ToList());
}
if (e.ActionType == SKTouchAction.Released)
{
// Delete e.Id from _fingers, because finger is released
_fingers.Remove(e.Id);
double velocityX;
double velocityY;
(velocityX, velocityY) = _velocityTracker.CalcVelocity(id, ticks);
// Is this a fling or swipe?
if (velocityX > 10000 || velocityY > 10000)
{
System.Diagnostics.Debug.WriteLine($"Velocity X = {velocityX}, Velocity Y = {velocityY}");
e.Handled = OnFlinged(velocityX, velocityY);
}
// Do we have a tap event
if (_touches.Count == 0 || _touches[id] == null)
{
e.Handled = false;
return;
}
if (_touches[id].Location.Equals(_firstTouch) && ticks - _touches[id].Tick < (e.DeviceType == SKTouchDeviceType.Mouse ? shortClick : longTap) * 10000)
{
// Start a timer with timeout delayTap ms. If than isn't arrived another tap, than it is a single
_doubleTapTestTimer = new System.Threading.Timer((l) =>
{
if (_numOfTaps > 1)
{
if (!e.Handled)
{
e.Handled = OnDoubleTapped(location, _numOfTaps);
}
}
else
if (!e.Handled)
{
e.Handled = OnSingleTapped((Geometries.Point)l);
}
_numOfTaps = 1;
if (_doubleTapTestTimer != null)
{
_doubleTapTestTimer.Dispose();
}
_doubleTapTestTimer = null;
}, location, UseDoubleTap ? delayTap : 0, -1);
}
else if (_touches[id].Location.Equals(_firstTouch) && ticks - _touches[id].Tick >= longTap * 10000)
{
if (!e.Handled)
{
e.Handled = OnLongTapped(location);
}
}
var releasedTouch = _touches[id];
_touches.Remove(id);
if (!e.Handled)
{
e.Handled = OnTouchEnd(_touches.Select(t => t.Value.Location).ToList(), releasedTouch.Location);
}
}
if (e.ActionType == SKTouchAction.Moved)
{
_touches[id] = new TouchEvent(id, location, ticks);
if (e.InContact)
{
_velocityTracker.AddEvent(id, location, ticks);
}
if (e.InContact && !e.Handled)
{
e.Handled = OnTouchMove(_touches.Select(t => t.Value.Location).ToList());
}
else
{
e.Handled = OnHovered(_touches.Select(t => t.Value.Location).FirstOrDefault());
}
}
}
public override bool DispatchTouchEvent(MotionEvent e)
{
var index = e.ActionIndex;
var action = e.ActionMasked;
var pointerId = e.GetPointerId(index);
switch (action & MotionEventActions.Mask)
{
case MotionEventActions.PointerDown:
MultiTouchGesture?.Invoke(this, EventArgs.Empty);
break;
case MotionEventActions.Up:
if ((DateTime.Now - _downTime).TotalMilliseconds < 200)
{
SingleTapGesture?.Invoke(this, EventArgs.Empty);
}
break;
}
switch (action)
{
case MotionEventActions.Down:
_downTime = DateTime.Now;
if (_velocityTracker == null)
{
_velocityTracker = VelocityTracker.Obtain();
}
else
{
// Reset the velocity tracker back to its initial state.
_velocityTracker.Clear();
}
if (IfVelocityTrackerIsNull())
{
return(true);
}
_velocityTracker.AddMovement(e);
break;
case MotionEventActions.Move:
if (IfVelocityTrackerIsNull())
{
return(true);
}
_velocityTracker.AddMovement(e);
_velocityTracker.ComputeCurrentVelocity(Sensitivity);
TryExportVelocity(_velocityTracker.GetXVelocity(pointerId), _velocityTracker.GetYVelocity(pointerId));
break;
case MotionEventActions.Up:
case MotionEventActions.Cancel:
if (IfVelocityTrackerIsNull())
{
return(true);
}
_velocityTracker.Recycle();
_velocityTracker = null;
break;
}
return(true);
}