/// <summary>
/// Must be called whenever a node value is changed externally, for example when a property node's backing field changes its value.
/// </summary>
public void WasChanged(object source)
{
if (!Enabled)
{
return;
}
ReactiveManager.GetNode(source).NotifyChildren();
(source as IListener)?.Notify();
}
/// <summary>
/// Indicate that the given variable was read. May cause other objects to become dependend on the given variable.
/// </summary>
public void WasRead(object source)
{
if (!Enabled)
{
return;
}
if (DependentsEvaluating.Count != 0)
{
var weakDependent = DependentsEvaluating.Peek().Dependency;
ReactiveManager.GetNode(source).Add(weakDependent);
}
}
/// <summary>
/// Must be called whenever a node value is changed externally, for example when a property node's backing field changes its value.
/// </summary>
public void WasChanged(object source)
{
if (!Enabled)
{
return;
}
ReactiveManager.GetNode(source).NotifyChildren(notifyList);
foreach (IListener toNotify in notifyList)
{
toNotify.Notify();
}
notifyList.Clear();
(source as IListener)?.Notify();
}
static void WasChangedForChild(Dependency childEdge)
{
var child = childEdge.Value;
if (child == null)
{
return;
}
var childNode = ReactiveManager.GetNode(child);
if (childNode.notificationsHad == childEdge.NotificationsHad) //Determines if the edge is still up-to-date.
{
childNode.WasNotified();
child.Notify();
childNode.NotifyChildren();
}
}
static void WasChangedForChild(ref Chain <IListener> result, IDependency childEdge)
{
var child = childEdge.Value;
if (child == null)
{
return;
}
var childNode = ReactiveManager.GetNode(child);
if (childNode.notificationsHad == childEdge.NotificationsHad) //Determines if the edge is still up-to-date.
{
childNode.WasNotified();
result = new Chain <IListener>(child, result);
childNode.NotifyChildren(ref result);
}
}
/// <summary>
/// Evaluation of reactive nodes must pass through this method.
/// </summary>
public T Evaluate <T>(IListener dependent, Func <T> func)
{
if (!Enabled)
{
return(func());
}
WasRead(dependent);
var node = ReactiveManager.GetNode(dependent);
var dependentReference = node.GetDependency(dependent);
DependentsEvaluating.Push(dependentReference);
var result = func();
DependentsEvaluating.Pop();
return(result);
}
