/// <summary>
/// Ivoked when trying change angle of the knob.
/// Sets the valid angle to knob by the event args.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">
/// The <see cref="Tech4WPF.Common.TryAngleChangeEventArgs"/> instance
/// containing the event data.
/// </param>
private void onTryAngleChange(UserControl sender, TryAngleChangeEventArgs e)
{
double newAngle = TechUtils.AngleToPositive360(e.NewAngle);
if (this.Snap)
{
newAngle = snapAngle(newAngle, e.OldAngle, e.IsWheelScrolling);
}
if (newAngle <= this.scale.AngleRange)
{
this.knob.Angle = newAngle;
}
else
{
double halfForbiddenAngleBehindRange = this.scale.AngleRange + ((360 - this.scale.AngleRange) / 2);
if (newAngle <= halfForbiddenAngleBehindRange)
{
this.knob.Angle = this.scale.AngleRange;
}
else
{
this.knob.Angle = 0;
}
}
}
/// <summary>
/// Fires the try angle change event.
/// </summary>
/// <param name="newAngle">The new angle.</param>
/// <param name="isWheelScrolling"><c>true</c> when is wheel scrolling.</param>
private void fireTryAngleChange(double newAngle, bool isWheelScrolling)
{
//Maintaining the temporary copy of event to avoid race condition
TryAngleChangeHandler tryAngleChange = TryAngleChange;
if (tryAngleChange != null)
{
TryAngleChangeEventArgs angleChangedEventArgs =
new TryAngleChangeEventArgs(newAngle, this.Angle, isWheelScrolling);
tryAngleChange(this, angleChangedEventArgs);
}
}
