public CompositePathGetter
(
IEnumerable <IBindingPathLink <object> > pathLinks,
PropertyType defaultValue
)
{
_pathLinks = pathLinks;
_defaultValue = defaultValue;
if (pathLinks.IsNullOrEmpty())
{
PropGetters.Add(new SimplePropGetter <object>());
return;
}
IObjWithPropGetter <object> previousPropGetter = null;
foreach (var pathLink in _pathLinks)
{
IObjWithPropGetter <object> propGetter = pathLink.CreateGetter();
PropGetters.Add(propGetter);
if (previousPropGetter != null)
{
IObjWithPropGetter <object> thePreviousPropGetter = previousPropGetter;
previousPropGetter.PropertyChangedEvent += () =>
{
propGetter.TheObj = thePreviousPropGetter.GetPropValue();
};
}
previousPropGetter = propGetter;
}
previousPropGetter.PropertyChangedEvent += () =>
{
if (this.PropertyChangedEvent == null)
{
return;
}
if (!LastPropGetter.HasObj)
{
_cachedValue.TheValue = _defaultValue;
}
else
{
_cachedValue.TheValue = (PropertyType)LastPropGetter.GetPropValue();
}
PropertyChangedEvent?.Invoke();
};
}
public CompositePathSetter(IEnumerable <IBindingPathLink <object> > pathLinks)
{
IBindingPathLink <object> theSetterPathLink = pathLinks.Last();
TheSetter = theSetterPathLink.CreateSetter();
PropGetters =
pathLinks
.TakeWhile((pathLink) => (!Object.ReferenceEquals(pathLink, theSetterPathLink)))
.Select((pathLink) => pathLink.CreateGetter())
.ToList();
IObjWithPropGetter <object> previousPropGetter = null;
foreach (var propGetter in PropGetters)
{
IObjWithPropGetter <object> thePreviousPropGetter = previousPropGetter;
if (previousPropGetter != null)
{
thePreviousPropGetter.PropertyChangedEvent += () =>
{
propGetter.TheObj = thePreviousPropGetter.GetPropValue();
};
}
previousPropGetter = propGetter;
}
if (previousPropGetter != null)
{
IObjWithPropGetter <object> thePreviousPropGetter = previousPropGetter;
// set the last property getter to the set the setter
previousPropGetter.PropertyChangedEvent += () =>
{
TheSetter.TheObj = thePreviousPropGetter.GetPropValue();
};
}
}
