public override void Execute()
{
base.Execute();
UndoActivity = CreateUndoActivity();
UndoActivity.AffectedFigures = new FigureCollection(DrawingView.SelectionEnumerator);
foreach (IFigure figure in DrawingView.Drawing.FiguresEnumerator)
{
DrawingView.AddToSelection(figure);
}
}
public override bool Undo()
{
if (base.Undo() == false)
{
return(false);
}
DrawingView.ClearSelection();
DrawingView.AddToSelection(AffectedFigures.ToFigures());
return(true);
}
public override bool Redo()
{
// do not call execute directly as the selection might has changed
if (Redoable)
{
foreach (IFigure figure in DrawingView.Drawing.FiguresEnumerator)
{
DrawingView.AddToSelection(figure);
}
return(true);
}
return(false);
}