/// <summary>
/// Updates properties from the values from another instance
/// </summary>
/// <param name="source"></param>
public void ValueFrom(RotateEventArgs source)
{
base.ValueFrom(source);
Angle = source.Angle;
DeltaAngle = source.DeltaAngle;
TotalAngle = source.TotalAngle;
}
/// <summary>
/// helper function used to calculate rotation angles
/// </summary>
/// <param name="previous"></param>
protected void CalculateAngles(RotateEventArgs previous)
{
if (Touches.Length > 1)
{
Angle = GetAngle();
}
else if (previous != null)
{
Angle = previous.Angle;
}
else
{
Angle = 0.0;
}
if (previous == null)
{
DeltaAngle = 0.0;
TotalAngle = 0.0;
return;
}
if (Touches.Length != previous.Touches.Length)
{
DeltaAngle = 0.0;
TotalAngle = previous.TotalAngle;
return;
}
DeltaAngle = Angle - previous.Angle;
DeltaAngle += (DeltaAngle > 180) ? -360 : (DeltaAngle < -180) ? +360 : 0;
TotalAngle = previous.TotalAngle + DeltaAngle;
}
/// <summary>
/// constructor
/// </summary>
/// <param name="source"></param>
/// <param name="newListener"></param>
public RotateEventArgs(RotateEventArgs source = null, Listener newListener = null) : base(source, newListener)
{
if (source != null)
{
Angle = source.Angle;
DeltaAngle = source.DeltaAngle;
TotalAngle = source.TotalAngle;
}
}
internal RotateEventArgs Diff(RotateEventArgs lastArgs)
{
return(new RotateEventArgs {
Cancelled = Cancelled,
Handled = Handled,
ViewPosition = ViewPosition,
Touches = Touches,
Listener = Listener,
Angle = Angle,
TotalAngle = TotalAngle,
DeltaAngle = Angle - lastArgs.Angle
});
}
internal RotateEventArgs Diff(RotateEventArgs lastArgs)
{
return(new RotateEventArgs {
Cancelled = Cancelled,
Handled = Handled,
ElementPosition = ElementPosition,
ElementTouches = ElementTouches,
WindowTouches = WindowTouches,
Listener = Listener,
Angle = Angle,
TotalAngle = TotalAngle,
DeltaAngle = Angle - lastArgs.Angle
});
}
/// <summary>
/// helper function used to calculate rotation angles
/// </summary>
/// <param name="previous"></param>
protected void CalculateAngles(RotateEventArgs previous)
{
if (Xamarin.Forms.Device.RuntimePlatform == Xamarin.Forms.Device.Android)
{
direction *= -1;
}
if (WindowTouches.Length > 1)
{
Angle = GetAngle(WindowTouches);
}
else if (previous != null)
{
Angle = previous.Angle;
}
else
{
Angle = 0.0;
}
if (previous == null)
{
DeltaAngle = 0.0;
TotalAngle = 0.0;
return;
}
if (WindowTouches.Length != previous.WindowTouches.Length)
{
DeltaAngle = 0.0;
TotalAngle = previous.TotalAngle;
return;
}
DeltaAngle = Angle - previous.Angle;
DeltaAngle += (DeltaAngle > 180) ? -360 : (DeltaAngle < -180) ? +360 : 0;
TotalAngle = previous.TotalAngle + DeltaAngle;
//System.Diagnostics.Debug.WriteLine("detalAngle=["+DeltaAngle.ToString("N2")+"]");
}
