/// <summary>
/// Notifies any subscribers that the value of a <see cref="ModelProperty"/> has changed.
/// </summary>
protected virtual void OnModelPropertyChanged(ModelPropertyChangedEventArgs e)
{
if (e.Property.PropertyChangedHandler != null)
{
e.Property.PropertyChangedHandler(this, e);
}
OnPropertyChanged(e);
if (e.Property.DependantProperties != null)
{
var changedProperties = new List <ModelPropertyChangedEventArgs>();
foreach (var propertyKey in e.Property.DependantProperties)
{
object currentValue;
if (_values.TryGetValue(propertyKey, out currentValue))
{
var property = ModelProperty.GetPropertyForKey(propertyKey);
var value = ((ModelProperty.UnitializedValue)property.DefaultValue).GetValue(this);
if (!Object.Equals(value, currentValue))
{
SetValueCore(property, value);
changedProperties.Add(new ModelPropertyChangedEventArgs(property, currentValue, value));
}
}
}
foreach (var changedProperty in changedProperties)
{
OnModelPropertyChanged(changedProperty);
}
}
}
internal void OnPropertyChanged(ModelPropertyChangedEventArgs e)
{
if (_propertyChangedHandlers.Count > 0)
{
WeakAction <object, ModelPropertyChangedEventArgs>[] handlers = null;
lock (_lockObject)
{
List <WeakAction <object, ModelPropertyChangedEventArgs> > propertyChangedHandlers;
if (_propertyChangedHandlers.TryGetValue(e.Property.Key, out propertyChangedHandlers))
{
for (int i = propertyChangedHandlers.Count - 1; i >= 0; i--)
{
if (!propertyChangedHandlers[i].IsAlive)
{
propertyChangedHandlers.RemoveAt(i);
}
}
if (propertyChangedHandlers.Count == 0)
{
_propertyChangedHandlers = _propertyChangedHandlers.Remove(e.Property.Key);
}
else
{
handlers = propertyChangedHandlers.ToArray();
}
}
}
if (handlers != null)
{
foreach (var handler in handlers)
{
handler.Invoke(this, e);
}
}
}
if (!String.IsNullOrEmpty(e.Property.PropertyName))
{
OnPropertyChanged(new PropertyChangedEventArgs(e.Property.PropertyName));
}
}
