state property
Implementation
void set state(Map<String, dynamic>value) {
final Map<String,dynamic> newState = {};
_state.keys.forEach((k) => newState[k] = _state[k]);
value.keys.forEach((k) => newState[k] = value[k]);
var oldState = _state;
_state = newState;
emit('statechange', null, oldState );
}