/// <summary>
/// Updates properties from the values from another instance
/// </summary>
/// <param name="source"></param>
public void ValueFrom(PanEventArgs source)
{
base.ValueFrom(source);
DeltaDistance = source.DeltaDistance;
TotalDistance = source.TotalDistance;
Velocity = source.Velocity;
}
/// <summary>
/// constructs new PanEventArgs
/// </summary>
/// <param name="source"></param>
/// <param name="newListener"></param>
public PanEventArgs(PanEventArgs source = null, Listener newListener = null) : base(source, newListener)
{
if (source != null)
{
DeltaDistance = source.DeltaDistance;
TotalDistance = source.TotalDistance;
Velocity = source.Velocity;
}
}
internal PanEventArgs Diff(PanEventArgs lastArgs)
{
return(new PanEventArgs
{
Cancelled = Cancelled,
Handled = Handled,
ViewPosition = ViewPosition,
Touches = Touches,
Listener = Listener,
Velocity = Velocity,
TotalDistance = TotalDistance,
DeltaDistance = TotalDistance.Subtract(lastArgs.TotalDistance)
});
}
/// <summary>
/// calculates the distance traversed since last sample
/// </summary>
/// <param name="previous"></param>
protected void CalculateDistances(PanEventArgs previous)
{
if (previous == null)
{
DeltaDistance = new Point(0.0, 0.0);
TotalDistance = new Point(0.0, 0.0);
return;
}
if (Touches.Length != previous.Touches.Length)
{
DeltaDistance = new Point(0.0, 0.0);
TotalDistance = previous.TotalDistance;
return;
}
DeltaDistance = Center.Subtract(previous.Center);
TotalDistance = previous.TotalDistance.Add(DeltaDistance);
}
/// <summary>
/// Equality test
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Equals(PanEventArgs other)
{
return(other != null && DeltaDistance.Equals(other.DeltaDistance) && TotalDistance.Equals(other.TotalDistance) && Velocity.Equals(other.Velocity) && base.Equals(other));
}