/// <summary>
/// Overrides the FirePropertyChanged method to fire the weakly held proxy events.
/// </summary>
protected override void FirePropertyChanged(string propName)
{
base.FirePropertyChanged(propName);
bool shouldScavenge = false;
for (int i = this.proxies.Count - 1; i >= 0; i--)
{
NavigationControllerProxy proxy = null;
PropertyChangedEventHandler callback = null;
WeakReference <NavigationControllerProxy> weakReference = this.proxies[i];
if (weakReference.TryGetTarget(out proxy) && this.callbackTable.TryGetValue(proxy, out callback))
{
callback(this, new PropertyChangedEventArgs(propName));
}
else
{
this.proxies.RemoveAt(i);
shouldScavenge = true;
}
}
// Remove all of the commands that have been GCed:
if (shouldScavenge)
{
foreach (ObservableCommand command in this.allCommands)
{
command.CleanupUnheldProxies();
}
}
}
/// <summary>
/// Registers a navigation proxy with the controller. This is a weak reference.
/// </summary>
/// <param name="proxy">The proxy to register</param>
public void RegisterProxy(NavigationControllerProxy proxy, PropertyChangedEventHandler callback)
{
this.proxies.Add(new WeakReference<NavigationControllerProxy>(proxy));
this.callbackTable.Add(proxy, callback);
}
/// <summary>
/// Registers a navigation proxy with the controller. This is a weak reference.
/// </summary>
/// <param name="proxy">The proxy to register</param>
public void RegisterProxy(NavigationControllerProxy proxy, PropertyChangedEventHandler callback)
{
this.proxies.Add(new WeakReference <NavigationControllerProxy>(proxy));
this.callbackTable.Add(proxy, callback);
}