/// <summary>
/// Called when any parameter managed by this instance has changed the <see cref="IActivatable.IsActive"/> property.
/// </summary>
/// <param name="parameter">Must not be null.</param>
protected virtual void HandleParameterActivityChanged(VstParameter parameter)
{
if (parameter == ActiveParameter && !parameter.IsActive)
{
ActiveParameter = null;
ChangeValue(ParameterInfo.NullValue);
}
if (ActiveParameter == null && parameter.IsActive)
{
ActiveParameter = parameter;
ChangeValue(parameter.Value);
}
}
private void Parameter_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
VstParameter currentParameter = sender as VstParameter;
switch (e.PropertyName)
{
case VstParameter.ValuePropertyName:
HandleParameterValueChanged(currentParameter);
break;
case VstParameter.IsActivePropertyName:
HandleParameterActivityChanged(currentParameter);
break;
}
}
/// <summary>
/// Subscribes to the events of the <paramref name="parameter"/>.
/// </summary>
/// <param name="parameter">Must not be null.</param>
public void SubscribeTo(VstParameter parameter)
{
Throw.IfArgumentIsNull(parameter, "parameter");
parameter.PropertyChanged += new PropertyChangedEventHandler(Parameter_PropertyChanged);
}
