/// <summary>
/// Called by each <see cref="ModelEvent"/> to notify the context that a model event has occurred.
/// </summary>
/// <param name="modelEvent"></param>
internal void Notify(ModelEvent modelEvent)
{
if (Event != null)
{
Event(this, modelEvent);
}
}
/// <summary>
/// Creates a new <see cref="ModelEventScope"/> that represents a specific event
/// within the object model.
/// </summary>
/// <param name="property"></param>
ModelEventScope(ModelEvent @event)
: this()
{
this.@event = @event;
}
/// <summary>
/// Performs the specified action inside a <see cref="ModelEventScope"/>.
/// </summary>
/// <param name="action"></param>
internal static void Perform(ModelEvent @event, Action action)
{
new ModelEventScope(@event).PerformAction(action);
}
protected internal override void OnInvoke(ModelInstance root, ModelEvent modelEvent)
{
// Marks the instance as pending delete if an owner property is set to null.
if (Property is ModelReferenceProperty && !Property.IsList)
root.IsPendingDelete = root.GetReference((ModelReferenceProperty)Property) == null;
}
/// <summary>
/// Merges a <see cref="ModelValueChangeEvent"/> into the current event.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
protected override bool OnMerge(ModelEvent e)
{
// Ensure the events are for the same reference property
var listChange = (ModelListChangeEvent) e;
if (listChange.Property != Property)
return false;
// Highly likely not to be right
var mergeAdded = Added.ToList();
mergeAdded.RemoveAll(i => listChange.Removed.Contains(i));
var mergeRemoved = Removed.ToList();
mergeRemoved.RemoveAll(i => listChange.Added.Contains(i));
mergeAdded = mergeAdded.Union(listChange.Added.Where(i => !Removed.Contains(i))).ToList();
mergeRemoved = mergeRemoved.Union(listChange.Removed.Where(i => !Added.Contains(i))).ToList();
Added = mergeAdded.ToArray();
Removed = mergeRemoved.ToArray();
var mergeAddedIds = AddedIds.ToList();
mergeAddedIds.RemoveAll(i => listChange.RemovedIds.Contains(i));
var mergeRemovedIds = RemovedIds.ToList();
mergeRemovedIds.RemoveAll(i => listChange.AddedIds.Contains(i));
mergeAddedIds = mergeAddedIds.Union(listChange.AddedIds.Where(i => !RemovedIds.Contains(i))).ToList();
mergeRemovedIds = mergeRemovedIds.Union(listChange.RemovedIds.Where(i => !AddedIds.Contains(i))).ToList();
AddedIds = mergeAddedIds.ToArray();
RemovedIds = mergeRemovedIds.ToArray();
return true;
}
protected internal override void OnInvoke(ModelInstance root, ModelEvent modelEvent)
{
ConditionTypes.First().When(root.Instance, () => ConditionApplies(root), new string[] { Property.Name });
}
/// <summary>
/// Attempts to merge two model events into a single event.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
internal bool Merge(ModelEvent e)
{
return Instance == e.Instance && GetType() == e.GetType() && OnMerge(e);
}
protected virtual bool OnMerge(ModelEvent e)
{
return false;
}
/// <summary>
/// Creates a new <see cref="ModelEventScope"/> that represents a specific event
/// within the object model.
/// </summary>
/// <param name="property"></param>
ModelEventScope(ModelEvent @event)
: this()
{
this.@event = @event;
}
/// <summary>
/// Performs the specified action inside a <see cref="ModelEventScope"/>.
/// </summary>
/// <param name="action"></param>
internal static void Perform(ModelEvent @event, Action action)
{
new ModelEventScope(@event).PerformAction(action);
}