/// <summary>Executes the specified unit.</summary>
/// <param name="unit">The command to execute.</param>
/// <param name="argument">The argument passed to the unit on execution.</param>
/// <param name="ownerKey">An object identifying the owner of the unit.</param>
public UnitResult PerformUnit <T>(UnitBase <T> unit, T argument, object ownerKey)
{
//AssertArg.IsNotNull(unit, nameof(unit));
if (unit == null)
{
throw new ArgumentNullException(nameof(unit));
}
if (ownerKey == null)
{
return(PerformUnit(unit, argument));
}
var eventArgs = new CancellableUndoServiceEventArgs(unit);
OnExecuting(eventArgs);
if (eventArgs.Cancel)
{
return(UnitResult.Cancelled);
}
/* Clear the undoable units for this context. */
undoableDictionary.Remove(ownerKey);
redoableDictionary.Remove(ownerKey);
if (!repeatableDictionary.TryGetValue(ownerKey,
out UnitCollection <IInternalUnit> repeatableUnits))
{
repeatableUnits = new UnitCollection <IInternalUnit>();
repeatableDictionary[ownerKey] = repeatableUnits;
}
repeatableUnits.AddLast(unit);
var result = unit.PerformUnit(argument, UnitMode.FirstTime);
TrimIfRequired(ownerKey);
OnExecuted(new UndoServiceEventArgs(unit));
return(result);
}
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);
}