public IMaybe <object> GetValue(IDependencyProperty dp)
{
if (HasValue(dp))
{
return(Maybe.FromValue(parent.GetValue(dp)));
}
return(Maybe.None <object>());
}
public void OnInheritanceParentChanged(IDependencyComponent oldParent, IDependencyComponent newParent)
{
var allSetProperties = new HashSet <IDependencyProperty>();
if (oldParent != null)
{
oldParent.PropertyChanged -= OnParentPropertyChanged;
foreach (var dp in oldParent.SetProperties)
{
if (Component.GetMetadata(dp).IsInherited)
{
allSetProperties.Add(dp);
}
}
}
if (newParent != null)
{
newParent.PropertyChanged += OnParentPropertyChanged;
foreach (var dp in newParent.SetProperties)
{
if (Component.GetMetadata(dp).IsInherited)
{
allSetProperties.Add(dp);
}
}
}
foreach (var dp in allSetProperties)
{
var oldValue = oldParent != null
? Maybe.FromValue(oldParent.GetValue(dp))
: Maybe.None <object>();
var newValue = newParent != null
? Maybe.FromValue(newParent.GetValue(dp))
: Maybe.None <object>();
if (Helpers.AreDifferent(oldValue, newValue))
{
ValueChanged?.Invoke(this, new ValueChangedEventArgs(Component, dp, oldValue, newValue));
}
}
}