/// <summary>
/// Finishes the previous undo group, if there was one, and begin a new undo group.
/// The name of the group is taken from the command argument.
/// </summary>
/// <remarks>
/// The undo group is automatically incremented based on events
/// eg. mouse down events, executing a menu item increments the current
/// group. But sometimes it is necessary to manually start a new group of undo operations.
/// </remarks>
/// <param name="command">The command that causes the new undo group to be started.
/// Pass null if the undo group should not be named.</param>
internal void PushUndoGroup(UndoableCommand command = null)
{
Undo.IncrementCurrentGroup();
if (command != null && !string.IsNullOrEmpty(command.UndoString))
{
Undo.SetCurrentGroupName(command.UndoString);
}
}
/// <summary>
/// Pushes the current state on the undo stack.
/// </summary>
/// <param name="command">Use command.UndoString as the name of the undo item.</param>
public virtual void PushUndo(UndoableCommand command)
{
Undo.RegisterCompleteObjectUndo(new Object[] { m_UndoState }, command?.UndoString ?? "");
}