internal void ListenPropertyChange(BindableProperty bindableProperty, PropertyChangedEventHandler eventHandler)
{
PropertyChangedListener propertyChangedListener;
BindablePropertyChangedEventDict.TryGetValue(bindableProperty.PropertyName, out propertyChangedListener);
if (null == propertyChangedListener)
{
propertyChangedListener = new PropertyChangedListener();
BindablePropertyChangedEventDict.Add(bindableProperty.PropertyName, propertyChangedListener);
}
propertyChangedListener.RegisterListnerHandler(eventHandler);
}
internal void RemovePropertyChangeListener(BindableProperty bindableProperty, PropertyChangedEventHandler propertyChangedEventHandler)
{
PropertyChangedListener propertyChangedListener;
BindablePropertyChangedEventDict.TryGetValue(bindableProperty.PropertyName, out propertyChangedListener);
if (null != propertyChangedListener)
{
propertyChangedListener.UnRegisterListnerHandler(propertyChangedEventHandler);
if (0 == propertyChangedListener.ListenerCount)
{
BindablePropertyChangedEventDict.Remove(bindableProperty.PropertyName);
}
}
}