/// <summary>
/// constructor
/// </summary>
/// <param name="source"></param>
/// <param name="newListener"></param>
public BaseGestureEventArgs(BaseGestureEventArgs source = null, Listener newListener = null)
{
if (source != null)
{
Listener = newListener ?? source.Listener;
Cancelled = source.Cancelled;
if (Listener != null)
{
WindowTouches = new Point[source.WindowTouches.Length];
ElementTouches = new Point[source.WindowTouches.Length];
for (int i = 0; i < source.WindowTouches.Length; i++)
{
WindowTouches[i] = source.WindowTouches[i];
ElementTouches[i] = Listener.Element.PointInElementCoord(source.ElementTouches[i], newListener.Element);
}
ElementPosition = VisualElementExtensions.CoordTransform(Listener.Element, source.ElementPosition, newListener.Element);
}
else
{
WindowTouches = (Point[])source.WindowTouches.Clone();
ElementTouches = (Point[])source.ElementTouches.Clone();
ElementPosition = source.ElementPosition;
}
}
}
/// <summary>
/// Updates properties of this instance with values from an other instance
/// </summary>
/// <param name="other"></param>
public void ValueFrom(BaseGestureEventArgs other)
{
Handled = other.Handled;
_center = other._center;
Listener = other.Listener;
Cancelled = other.Cancelled;
ViewPosition = other.ViewPosition;
Touches = other.Touches;
}
/// <summary>
/// Updates properties of this instance with values from an other instance
/// </summary>
/// <param name="other"></param>
public void ValueFrom(BaseGestureEventArgs other)
{
Handled = other.Handled;
_center = other._center;
Listener = other.Listener;
Cancelled = other.Cancelled;
ElementPosition = other.ElementPosition;
ElementTouches = other.ElementTouches;
WindowTouches = other.WindowTouches;
}
/// <summary>
/// Equal test
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Equals(BaseGestureEventArgs other)
{
if (other == null)
return false;
if (WindowTouches == null && other.WindowTouches == null)
return true;
if (WindowTouches.Length != other.WindowTouches.Length)
return false;
for (int i = 0; i < WindowTouches.Length; i++)
if (!Equals(WindowTouches[i], other?.WindowTouches[i]))
return false;
return true;
}
/// <summary>
/// Equal test
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Equals(BaseGestureEventArgs other)
{
if (other == null)
{
return(false);
}
if (Touches == null && other.Touches == null)
{
return(true);
}
if (Touches.Length != other.Touches.Length)
{
return(false);
}
for (int i = 0; i < Touches.Length; i++)
{
if (!Equals(Touches[i], other?.Touches[i]))
{
return(false);
}
}
return(true);
}
/// <summary>
/// calculates the distance traversed since last sample
/// </summary>
/// <param name="previous"></param>
protected void CalculateDistances(BaseGestureEventArgs previous) //, Point locationAtStart)
{
if (previous == null)
{
DeltaDistance = new Point(0.0, 0.0);
TotalDistance = new Point(0.0, 0.0);
return;
}
DeltaDistance = Center(WindowTouches).Subtract(Center(previous.WindowTouches));
if (previous is PanEventArgs previousPan)
{
if (WindowTouches.Length != previous.WindowTouches.Length)
{
DeltaDistance = new Point(0.0, 0.0);
TotalDistance = previousPan.TotalDistance;
return;
}
TotalDistance = previousPan.TotalDistance.Add(DeltaDistance);
}
else
{
TotalDistance = DeltaDistance;
}
}