/// <summary>
/// Clears the undo and redo stacks.
/// </summary>
public void Clear(object ownerKey = null)
{
if (ownerKey == null)
{
globallyRepeatableUnits.Clear();
globallyUndoableUnits.Clear();
globallyRedoableUnits.Clear();
OnCleared(EventArgs.Empty);
return;
}
if (repeatableDictionary.TryGetValue(ownerKey,
out UnitCollection <IInternalUnit> repeatableUnits))
{
repeatableUnits.Clear();
}
if (undoableDictionary.TryGetValue(ownerKey,
out UnitCollection <IUndoableUnit> undoableUnits))
{
undoableUnits.Clear();
}
if (redoableDictionary.TryGetValue(ownerKey,
out UnitCollection <IUndoableUnit> redoableUnits))
{
redoableUnits.Clear();
}
OnCleared(EventArgs.Empty);
}
UnitResult PerformUnit <T>(UnitBase <T> unit, T argument)
{
var eventArgs = new CancellableUndoServiceEventArgs(unit);
OnExecuting(eventArgs);
if (eventArgs.Cancel)
{
return(UnitResult.Cancelled);
}
globallyRedoableUnits.Clear();
globallyUndoableUnits.Clear();
globallyRepeatableUnits.AddLast(unit);
UnitResult result = unit.PerformUnit(argument, UnitMode.FirstTime);
TrimIfRequired();
OnExecuted(new UndoServiceEventArgs(unit));
return(result);
}
public void KillAll()
{
m_units.Clear();
}