public void AggregateUndoServiceUndoRedoTest()
{
// UndoServiceAggregate is created using an IUndoService array:
var undoServiceForInt = new UndoService <int>(GetIntState, SetIntState, null);
var undoServiceForString = new UndoService <string>(GetStringState, SetStringState, null);
IUndoService[] subservices = { undoServiceForInt, undoServiceForString };
var serviceAggregate = new UndoServiceAggregate(subservices);
// Changes are recorded by the individual UndoServices
_statefulInt = 1;
undoServiceForInt.RecordState();
_statefulString = "One";
undoServiceForString.RecordState();
_statefulInt = 2;
undoServiceForInt.RecordState();
_statefulInt = 3;
undoServiceForInt.RecordState();
_statefulString = "Two";
undoServiceForString.RecordState();
/*
* The UndoServiceAggregate provides a unified interface for performing undo/redo on the different tracked objects.
* (You can also perform Undo/Redo on the individual services, which will undo the last change on the corresponding object.)
*/
serviceAggregate.Undo();
Assert.IsTrue(_statefulString.Equals("One"));
Assert.IsTrue(_statefulInt == 3);
serviceAggregate.Undo();
Assert.IsTrue(_statefulString.Equals("One"));
Assert.IsTrue(_statefulInt == 2);
serviceAggregate.Undo();
Assert.IsTrue(_statefulString.Equals("One"));
Assert.IsTrue(_statefulInt == 1);
serviceAggregate.Redo();
Assert.IsTrue(_statefulString.Equals("One"));
Assert.IsTrue(_statefulInt == 2);
serviceAggregate.Redo();
Assert.IsTrue(_statefulString.Equals("One"));
Assert.IsTrue(_statefulInt == 3);
serviceAggregate.Redo();
Assert.IsTrue(_statefulString.Equals("Two"));
Assert.IsTrue(_statefulInt == 3);
}
public void CanUndoCanRedoChangedAggregateTest()
{
_aggregateService.CanUndoChanged += _aggregateService_CanUndoChanged;
_aggregateService.CanRedoChanged += _aggregateService_CanRedoChanged;
_statefulInt = 1;
_subUndoServiceForInt.RecordState();
Assert.IsTrue(_canRedoChangedFiredCount == 0);
Assert.IsTrue(_canUndoChangedFiredCount == 1); //Item added to empty undo stack
_statefulString = "One";
_subUndoServiceForString.RecordState();
Assert.IsTrue(_canUndoChangedFiredCount == 1); //Adding an item to an empty sub stack does not fire the event in the aggregate per se
_aggregateService.Undo();
Assert.IsTrue(_canUndoChangedFiredCount == 1); //Doesn't necessarily fire the event if the last item is removed from a subservice
Assert.IsTrue(_canRedoChangedFiredCount == 1); //Item added to empty redo stack
_aggregateService.Undo();
Assert.IsTrue(_canUndoChangedFiredCount == 2); //Last item removed from undo stack (event fires)
Assert.IsTrue(_canRedoChangedFiredCount == 1); //Item added to already filled redo stack (no event)
_aggregateService.Reset();
Assert.IsTrue(_canRedoChangedFiredCount == 2); //Redo stack cleared
Assert.IsTrue(_canUndoChangedFiredCount == 2); //Undo Stack was already empty so there was no change
_statefulInt = 2;
_subUndoServiceForInt.RecordState(); //Item added to undo stack (event count = 3)
_aggregateService.Undo(); //Item added to redo stack (event count = 3), item removed from undo stack (event count = 4)
_aggregateService.Redo();
Assert.IsTrue(_canRedoChangedFiredCount == 4); //Last item removed from redo stack (event fired).
Assert.IsTrue(_canUndoChangedFiredCount == 5); //Item added to empty undo stack (via undo operation).
}
