private void Rollback(List <HistoryMemento> historyMementos)
{
for (int i = historyMementos.Count - 1; i >= 0; i--)
{
HistoryMemento ha = historyMementos[i];
ha.PerformUndo();
}
}
protected override HistoryMemento OnUndo()
{
List <HistoryMemento> redoActions = new List <HistoryMemento>(actions.Count);
for (int i = 0; i < actions.Count; ++i)
{
HistoryMemento ha = actions[actions.Count - i - 1];
HistoryMemento rha = null;
if (ha != null)
{
rha = ha.PerformUndo();
}
redoActions.Add(rha);
}
CompoundHistoryMemento cha = new CompoundHistoryMemento(Name, Image, redoActions);
return(cha);
}
private void CancelDrawing()
{
((TransactedTool <TDerived, TChanges>) this).VerifyAccess <TransactedTool <TDerived, TChanges> >();
if (this.State != TransactedToolState.Drawing)
{
throw new InvalidOperationException($"Can only CancelDrawing when State is Drawing (State={this.State}, Tool={base.GetType().Name})");
}
if (!this.drawingAgent.TransactionToken.IsCanceling)
{
this.drawingAgent.TransactionToken.Cancel();
}
else
{
this.OnCancelingDrawing();
this.drawingAgent.TransactionToken = null;
this.drawingAgent = null;
this.SetState(TransactedToolState.Idle);
this.Changes = default(TChanges);
HistoryMemento beforeDrawingMemento = this.beforeDrawingMemento;
this.beforeDrawingMemento = null;
beforeDrawingMemento.PerformUndo(null);
}
}