use custom_element pkg

lib/observe/map.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library web_ui.observe.map;
 
 import 'dart:collection';
 import 'observable.dart';
 
 typedef Map<K, V> MapFactory<K, V>();
@@ skipping 25 matching lines @@
   // TODO(jmesserly): removed type annotation to workaround:
   // https://code.google.com/p/dart/issues/detail?id=11540
   ObservableMap.linked() : this(createMap: () => new LinkedHashMap/*<K, V>*/());
 
   /** Creates a new observable map using a [SplayTreeMap]. */
   ObservableMap.sorted() : this(createMap: () => new SplayTreeMap/*<K, V>*/());
 
   /**
    * Creates an observable map that contains all key value pairs of [other].
    */
-  factory ObservableMap.from(Map<K, V> other, {MapFactory<K, V> createMap}) {
-    var result = new ObservableMap<K, V>(createMap: createMap);
-    other.forEach((K key, V value) { result[key] = value; });
+  factory ObservableMap.from(Map/*<K, V>*/ other, {MapFactory/*<K, V>*/ createMap}) {

[Siggi Cherem (dart-lang), 2013/08/05 22:02:06]

80 col

[Jennifer Messerly, 2013/08/06 16:35:33]

Done.

+    var result = new ObservableMap/*<K, V>*/(createMap: createMap);
+    other.forEach((/*K*/ key, /*V*/value) { result[key] = value; });
     return result;
   }
 
 
   Iterable<K> get keys => _keys;
 
   Iterable<V> get values => _values;
 
   int get length {
     if (observeReads) notifyRead(this, ChangeRecord.FIELD, 'length');
@@ skipping 142 matching lines @@
       throw new StateError('keys and values should be the same length');
     }
     return _hasNext = moreValues;
   }
 
   V get current {
     if (observeReads && _hasNext) _map._notifyReadKey(_keys.current);
     return _values.current;
   }
 }