public IndexPropertyObserver(Type propertyContainingType, IndexPropertyPathElement propertyPathElement, XamlNamespaces namespaces)
{
baseObserver = CreateBaseObserver(propertyContainingType, propertyPathElement.PropertyName);
PropertyInfo indexPropertyInfo = baseObserver != null?baseObserver.ValueType.GetDefaultIndexProperty() :
propertyPathElement.PropertyName.IsEmpty ? propertyContainingType.GetDefaultIndexProperty() : propertyContainingType.GetInstanceProperty(propertyPathElement.PropertyName.MemberName);
if (indexPropertyInfo == null)
{
throw new Granular.Exception("Property \"{0}.{1}\" does not have an indexer", propertyContainingType.Name, propertyPathElement.PropertyName.MemberName);
}
if (indexPropertyInfo.GetIndexParameters().Count() != propertyPathElement.IndexRawValues.Count())
{
throw new Granular.Exception("Invalid number of index parameters for \"{0}.{1}\"", indexPropertyInfo.DeclaringType.Name, indexPropertyInfo.Name);
}
indexerObserver = new ClrPropertyObserver(indexPropertyInfo, propertyPathElement.ParseIndexValues(indexPropertyInfo));
indexerObserver.ValueChanged += (sender, e) => ValueChanged.Raise(this, e);
if (baseObserver != null)
{
baseObserver.ValueChanged += (sender, e) => indexerObserver.SetBaseValue(baseObserver.Value);
indexerObserver.SetBaseValue(baseObserver.Value);
}
}
public void SetBaseValue(object baseValue)
{
if (baseObserver != null)
{
baseObserver.SetBaseValue(baseValue);
}
else
{
indexerObserver.SetBaseValue(baseValue);
}
}
private void SetDelegateObserverBaseValue()
{
object baseValue = baseObserver.Value;
if (ObservableValue.IsNullOrUnset(baseValue) || baseObserverValueType == baseValue.GetType())
{
if (delegateObserver != null)
{
delegateObserver.SetBaseValue(baseValue);
}
return;
}
baseObserverValueType = baseValue.GetType();
if (delegateObserver is IDisposable)
{
((IDisposable)delegateObserver).Dispose();
}
delegateObserver = propertyPathElement.CreatePropertyObserver(baseObserverValueType);
if (delegateObserver != null)
{
ValueType = delegateObserver.ValueType;
delegateObserver.SetBaseValue(baseValue);
delegateObserver.ValueChanged += (sender, e) => observableValue.Value = delegateObserver.Value;
observableValue.Value = delegateObserver.Value;
}
else
{
ValueType = null;
observableValue.Value = ObservableValue.UnsetValue;
}
}
private void SetDelegateObserverBaseValue()
{
object baseValue = baseObserver.Value;
if (ObservableValue.IsNullOrUnset(baseValue) || baseObserverValueType == baseValue.GetType())
{
if (delegateObserver != null)
{
delegateObserver.SetBaseValue(baseValue);
}
return;
}
baseObserverValueType = baseValue.GetType();
if (delegateObserver is IDisposable)
{
((IDisposable)delegateObserver).Dispose();
}
delegateObserver = propertyPathElement.CreatePropertyObserver(baseObserverValueType);
if (delegateObserver != null)
{
ValueType = delegateObserver.ValueType;
delegateObserver.SetBaseValue(baseValue);
delegateObserver.ValueChanged += (sender, e) => observableValue.Value = delegateObserver.Value;
observableValue.Value = delegateObserver.Value;
}
else
{
ValueType = null;
observableValue.Value = ObservableValue.UnsetValue;
}
}