/// <summary>
/// Implement this method to execute your handler processing.
/// </summary>
/// <param name = "input">Inputs to the current call to the target.</param>
/// <param name = "getNext">Delegate to execute to get the next delegate in the handler
/// chain.</param>
/// <returns>
/// Return value from the target.
/// </returns>
public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext)
{
object newValue = null;
object oldValue = null;
BindableModelObject bindableObject = null;
if (input.MethodBase.Name.StartsWith("set_"))
{
string propertyName = input.MethodBase.Name.Substring(4);
newValue = input.Arguments[ValueParameter];
var propertyInfo = input.Target.GetType().GetProperty(propertyName);
oldValue = propertyInfo.GetValue(input.Target, null);
bindableObject = input.Target as BindableModelObject;
}
var nextDelegate = getNext()(input, getNext);
if (bindableObject != null)
{
ProcessChanges(bindableObject, newValue, oldValue);
} //if
return(nextDelegate);
}
/// <summary>
/// Processes the changes and invokes the NotifyPropertyChanges event on Self property.
/// </summary>
/// <param name="bindableObject">The bindable object.</param>
/// <param name="newValue">The new value.</param>
/// <param name="oldValue">The old value.</param>
private void ProcessChanges(BindableModelObject bindableObject, object newValue, object oldValue)
{
bindableObject.RiseSelfPropertyChanged();
if (_cashedBindableObject == null)
{
_cashedBindableObject = bindableObject;
} //if
UnregisterValue(oldValue);
RegisterValue(newValue);
}
/// <summary>
/// Implement this method to execute your handler processing.
/// </summary>
/// <param name = "input">Inputs to the current call to the target.</param>
/// <param name = "getNext">Delegate to execute to get the next delegate in the handler
/// chain.</param>
/// <returns>
/// Return value from the target.
/// </returns>
public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext)
{
string propertyName;
PropertyInfo propertyInfo;
object oldValue = null;
bool isAttributed = GetAttributedMethodParts(input, out propertyName, out propertyInfo);
if (isAttributed && propertyInfo != null)
{
oldValue = propertyInfo.GetValue(input.Target, null);
}
// let the original call go through first, so we can notify *after*
IMethodReturn result = getNext()(input, getNext);
if (!isAttributed)
{
return(result);
}
if (propertyInfo != null)
{
object newValue = propertyInfo.GetValue(input.Target, null);
if ((newValue == null || oldValue == null) || !newValue.Equals(oldValue))
{
// get the field storing the delegate list that are stored by the event.
BindableModelObject bindableModelObject = input.Target as BindableModelObject;
if (bindableModelObject != null)
{
bindableModelObject.RisePropertyChanged(propertyName);
}
//invoke value changed.
if (_containerWiring != null)
{
_containerWiring.RiseValueChanged(new ValueChangedEventArgs(propertyInfo, input.Target,
oldValue, newValue));
} //if
}
}
return(result);
}
