internal UndoManager(FlowChart document)
{
this.document = document;
defaultCmdContext = new CommandContext(document);
history = new CommandHistory();
resetContext();
// disable undo by default, it might be too expensive
// in memory and CPU cycles
undoEnabled = false;
}
internal void setContext(CommandContext cmdContext)
{
this.cmdContext = cmdContext;
foreach (Command cmd in subCommands)
cmd.setContext(cmdContext);
}