public void OnTouchAction(Element element, TouchActionEventArgs args)
{
TouchAction?.Invoke(element, args);
if (args.Type == TouchActionType.Pressed)
{
if (element.GetValue(CommandProperty) is ICommand iCommand)
{
if (iCommand?.CanExecute(element) == true)
{
iCommand.Execute(element);
}
}
}
}
public void OnTouchAction(Element element, TouchActionEventArgs args)
{
TouchAction?.Invoke(element, args);
}
private async void OnTouch(object sender, SKTouchEventArgs e)
{
// Save time, when the event occures
long ticks = DateTime.Now.Ticks;
var location = GetScreenPosition(e.Location);
// if user handles action by his own return
TouchAction?.Invoke(sender, e);
if (e.Handled)
{
return;
}
if (e.ActionType == SKTouchAction.Pressed)
{
_firstTouch = location;
_touches[e.Id] = new TouchEvent(e.Id, location, ticks);
_flingTracker.Clear();
// Do we have a doubleTapTestTimer running?
// If yes, stop it and increment _numOfTaps
if (_waitingForDoubleTap)
{
_waitingForDoubleTap = false;
_numOfTaps++;
}
else
{
_numOfTaps = 1;
}
e.Handled = OnTouchStart(_touches.Select(t => t.Value.Location).ToList());
}
// Delete e.Id from _touches, because finger is released
else if (e.ActionType == SKTouchAction.Released && _touches.TryRemove(e.Id, out var releasedTouch))
{
// Is this a fling or swipe?
if (_touches.Count == 0)
{
double velocityX;
double velocityY;
(velocityX, velocityY) = _flingTracker.CalcVelocity(e.Id, ticks);
if (Math.Abs(velocityX) > 200 || Math.Abs(velocityY) > 200)
{
// 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 Samsung). So check, if touch start location isn't more
// than a number of pixels away from touch end location.
bool isAround = IsAround(releasedTouch);
// 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)
{
_waitingForDoubleTap = true;
if (UseDoubleTap)
{
await Task.Delay(delayTap);
}
if (_numOfTaps > 1)
{
if (!e.Handled)
{
e.Handled = OnDoubleTapped(location, _numOfTaps);
}
}
else
{
if (!e.Handled)
{
e.Handled = OnSingleTapped(location);
}
}
_numOfTaps = 1;
if (_waitingForDoubleTap)
{
_waitingForDoubleTap = false;;
}
}
else if (isAround && (ticks - releasedTouch.Tick) >= longTap * 10000)
{
if (!e.Handled)
{
e.Handled = OnLongTapped(location);
}
}
}
_flingTracker.RemoveId(e.Id);
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);
}
}
else if (e.ActionType == SKTouchAction.Moved)
{
_touches[e.Id] = new TouchEvent(e.Id, location, ticks);
if (e.InContact)
{
_flingTracker.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());
}
}
else if (e.ActionType == SKTouchAction.Cancelled)
{
// This gesture is cancelled, so clear all touches
_touches.Clear();
}
else if (e.ActionType == SKTouchAction.Exited && _touches.TryRemove(e.Id, out var exitedTouch))
{
e.Handled = OnTouchExited(_touches.Select(t => t.Value.Location).ToList(), exitedTouch.Location);
}
else if (e.ActionType == SKTouchAction.Entered)
{
e.Handled = OnTouchEntered(_touches.Select(t => t.Value.Location).ToList());
}
else if (e.ActionType == SKTouchAction.WheelChanged)
{
if (e.WheelDelta > 0)
{
OnZoomIn(location);
}
else
{
OnZoomOut(location);
}
}
}
public void OnTouchAction(Xamarin.Forms.Element element, TouchActionEventArgs args)
{
TouchAction?.Invoke(element, args);
}
public virtual void OnTouchAction(Element element, TouchActionEventArgs args)
{
TouchAction?.Invoke(element, args);
System.Diagnostics.Debug.WriteLine($"\nTouch Event: {args.Type}; Is in Contact: {args.IsInContact}; Location: {args.Location}\n");
}
public void OnTouchAction()
{
TouchAction?.Invoke();
}