samples/pop_pop_win: now based on StageXL

samples/pop_pop_win/lib/src/html/game_storage.dart

-part of pop_pop_win.html;
-
-class GameStorage {
-  static const _gameCountKey = 'gameCount';
-  final EventHandle _bestTimeUpdated = new EventHandle();
-  final Map<String, String> _cache = new Map<String, String>();
-
-  Future<int> get gameCount => _getIntValue(_gameCountKey);
-
-  Stream get bestTimeUpdated => _bestTimeUpdated.stream;
-
-  void recordState(GameState state) {
-    assert(state != null);
-    _incrementIntValue(state.name);
-  }
-
-  Future<bool> updateBestTime(Game game) {
-    assert(game != null);
-    assert(game.state == GameState.won);
-
-    final w = game.field.width;
-    final h = game.field.height;
-    final m = game.field.bombCount;
-    final duration = game.duration.inMilliseconds;
-
-    final key = _getKey(w, h, m);
-
-    return _getIntValue(key, null)
-        .then((int currentScore) {
-          if(currentScore == null || currentScore > duration) {
-            _setIntValue(key, duration);
-            _bestTimeUpdated.add(null);
-            return true;
-          } else {
-            return false;
-          }
-        });
-  }
-
-  Future<int> getBestTimeMilliseconds(int width, int height, int bombCount) {
-    final key = _getKey(width, height, bombCount);
-    return _getIntValue(key, null);
-  }
-
-  Future reset() {
-    _cache.clear();
-    return targetPlatform.clearValues();
-  }
-
-  Future<int> _getIntValue(String key, [int defaultValue = 0]) {
-    assert(key != null);
-    if (_cache.containsKey(key)) {
-      return new Future.value(_parseValue(_cache[key], defaultValue));
-    }
-
-    return targetPlatform.getValue(key)
-        .then((String strValue) {
-          _cache[key] = strValue;
-          return _parseValue(strValue, defaultValue);
-        });
-  }
-
-  Future _setIntValue(String key, int value) {
-    assert(key != null);
-    _cache.remove(key);
-    String val = (value == null) ? null : value.toString();
-    return targetPlatform.setValue(key, val);
-  }
-
-  Future _incrementIntValue(String key) {
-    return _getIntValue(key)
-        .then((int val) {
-          return _setIntValue(key, val + 1);
-        });
-  }
-
-  static String _getKey(int w, int h, int m) => "w$w-h$h-m$m";
-
-  static int _parseValue(String value, int defaultValue) {
-    if(value == null) {
-      return defaultValue;
-    } else {
-      return int.parse(value);
-    }
-  }
-
-}