states 0.9.21

States is Finite State Machine for Dart. You can define states of your application and reaction on transition between states

States - Finite State Machine for Dart v0.1.0

API:

abstract class IStates {
	String current();
	bool has({ String action, String state, bool conform = true });
	bool add( String newState );
	bool change( String toState,  { bool performAction = true } );
	bool action( String fromState, String toState, String action,
			[ StatesActionListener handler ]);
	bool perform( String actionName );
	List<StateAction> actions();
	List<StateMeta> metas();
	void reset();
}

Usage

A simple usage example:

States states = new States();

   states.add( STATE_INITIAL );

   states.add( STATE_LOADING );
   states.add( STATE_LOADING_COMPLETE );
   states.add( STATE_LOADING_FAILED );

   states.action(
           STATE_INITIAL,
           STATE_LOADING,
           ACTION_LOADING_START,
           (StateAction action) {
               print("> CURRENT on ACTION_LOADING_START state: " + states.current());
               scheduleMicrotask(() {
                   print("> \t END OF microtask queue -> state: " + states.current());
                   var nextBool = Random.secure().nextBool();
                   print("> \t\t next bool: " + nextBool.toString());
                   states.perform(
                           nextBool ?
                           ACTION_LOADING_COMPLETE :
                           ACTION_LOADING_FAILED
                   );
               });
           });

   states.action(
           STATE_LOADING,
           STATE_LOADING_COMPLETE,
           ACTION_LOADING_COMPLETE,
           (StateAction action) {
               print("> CURRENT on ACTION_LOADING_COMPLETE - state: " + states.current());
               scheduleMicrotask(() => print("> \t END OF microtask queue -> state: " + states.current()));
           }
   );

   states.action(
           STATE_LOADING,
           STATE_LOADING_FAILED,
           ACTION_LOADING_FAILED,
           (StateAction action) {
               print("> CURRENT on ACTION_LOADING_FAILED state: " + states.current());
               scheduleMicrotask(() => print("> \t END OF microtask queue -> state: " + states.current()));
           }
   );

   states.perform( ACTION_LOADING_START );

SPA with States

Please take a look how this library can help to create SPA with simple dart html SPA with States