/// <summary>
/// Starts a group undo task
/// </summary>
/// <param name="description">A description for the task</param>
/// <param name="discardOnOperation">Whether to discard the undo group if it's opened on this UndoSystem while it receives an undo/redo call</param>
public void StartGroupUndo(string description, bool discardOnOperation = false)
{
if (InGroupUndo)
{
return;
}
_currentGroupUndoTask = new GroupUndoTask(description)
{
DiscardOnOperation = discardOnOperation
};
}
/// <summary>
/// Finishes and records the current grouped undo tasks
/// </summary>
/// <param name="cancel">Whether to cancel the undo operations currently grouped</param>
public void FinishGroupUndo(bool cancel = false)
{
if (!InGroupUndo)
{
return;
}
GroupUndoTask task = _currentGroupUndoTask;
_currentGroupUndoTask = null;
if (task.UndoList.Count > 0 && !cancel)
{
RegisterUndo(task);
}
else
{
task.Clear();
}
}