/// <summary>
/// Invoked whenever action items are discarded from the stack.
/// </summary>
/// <param name="e">The arguments that will be passed to the <see cref="ActionItemsDiscarded"/> event raised by this method.</param>
protected virtual void OnActionItemsDiscarded(DiscardedActionItemsEventArgs <IActionItem> e)
{
var handler = ActionItemsDiscarded;
if (handler != null)
{
handler(this, e);
}
}
private void ActionItemsDiscarded(object sender, DiscardedActionItemsEventArgs <IActionItem> e)
{
var dirtiables = new HashSet <IDirtiable>();
switch (e.Type)
{
case ActionItemDiscardType.Swallowed:
foreach (var actionItem in e.ActionItems.SelectMany(GetDirtiableItems))
{
foreach (var dirtiable in actionItem.Dirtiables)
{
List <DirtiableActionItem> dirtiableActionItems;
if (!dirtiableActionMap.TryGetValue(dirtiable, out dirtiableActionItems))
{
dirtiableActionItems = new List <DirtiableActionItem>();
dirtiableActionMap.Add(dirtiable, dirtiableActionItems);
}
dirtiableActionItems.Remove(actionItem);
if (!swallowedActionsMap.TryGetValue(dirtiable, out dirtiableActionItems))
{
dirtiableActionItems = new List <DirtiableActionItem>();
swallowedActionsMap.Add(dirtiable, dirtiableActionItems);
}
dirtiableActionItems.Add(actionItem);
}
}
break;
case ActionItemDiscardType.Disbranched:
foreach (var actionItem in e.ActionItems.SelectMany(GetDirtiableItems))
{
foreach (var dirtiable in actionItem.Dirtiables)
{
List <DirtiableActionItem> dirtiableActionItems;
if (!dirtiableActionMap.TryGetValue(dirtiable, out dirtiableActionItems))
{
dirtiableActionItems = new List <DirtiableActionItem>();
dirtiableActionMap.Add(dirtiable, dirtiableActionItems);
}
dirtiableActionItems.Remove(actionItem);
dirtiables.Add(dirtiable);
}
}
break;
case ActionItemDiscardType.UndoRedoInProgress:
break;
default:
throw new ArgumentOutOfRangeException();
}
UpdateDirtiables(dirtiables);
}
/// <summary>
/// Invoked whenever action items are discarded from the stack.
/// </summary>
/// <param name="e">The arguments that will be passed to the <see cref="ActionItemsDiscarded"/> event raised by this method.</param>
protected virtual void OnActionItemsDiscarded(DiscardedActionItemsEventArgs <IActionItem> e)
{
ActionItemsDiscarded?.Invoke(this, e);
}
