Rationalize Dart mojo and sky package structure

sky/framework/components/popup_menu.dart

Index: sky/framework/components/popup_menu.dart
diff --git a/sky/framework/components/popup_menu.dart b/sky/framework/components/popup_menu.dart
deleted file mode 100644
index 90e099496207c2e62013a18786137a9a05b646ea..0000000000000000000000000000000000000000
--- a/sky/framework/components/popup_menu.dart
+++ /dev/null
@@ -1,115 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'animated_component.dart';
-import '../animation/animated_value.dart';
-import '../fn.dart';
-import '../theme/colors.dart';
-import 'dart:async';
-import 'dart:math' as math;
-import 'material.dart';
-import 'popup_menu_item.dart';
-
-const double _kMenuOpenDuration = 300.0;
-const double _kMenuCloseDuration = 200.0;
-const double _kMenuCloseDelay = 100.0;
-
-enum MenuState { Hidden, Opening, Open, Closing }
-
-class PopupMenuController {
-  AnimatedValue position = new AnimatedValue(0.0);
-  MenuState _state = MenuState.Hidden;
-  MenuState get state => _state;
-
-  bool get canReact => (_state == MenuState.Opening) || (_state == MenuState.Open);
-
-  open() async {
-    if (_state != MenuState.Hidden)
-      return;
-    _state = MenuState.Opening;
-    if (await position.animateTo(1.0, _kMenuOpenDuration) == 1.0)
-      _state = MenuState.Open;
-  }
-
-  Future _closeState;
-  close() async {
-    var result = new Completer();
-    _closeState = result.future;
-    if ((_state == MenuState.Opening) || (_state == MenuState.Open)) {
-      _state = MenuState.Closing;
-      await position.animateTo(0.0, _kMenuCloseDuration, initialDelay: _kMenuCloseDelay);
-      _state = MenuState.Hidden;
-      _closeState = null;
-      result.complete();
-      return result.future;
-    }
-    assert(_closeState != null);
-    return _closeState;
-  }
-}
-
-class PopupMenu extends AnimatedComponent {
-  static final Style _style = new Style('''
-    border-radius: 2px;
-    padding: 8px 0;
-    box-sizing: border-box;
-    background-color: ${Grey[50]};''');
-
-  List<List<UINode>> items;
-  int level;
-  PopupMenuController controller;
-
-  double _position;
-  int _width;
-  int _height;
-
-  PopupMenu({ Object key, this.controller, this.items, this.level })
-      : super(key: key) {
-    animateField(controller.position, #_position);
-    onDidMount(_measureSize);
-  }
-
-  double _opacityFor(int i) {
-    if (_position == null || _position == 1.0)
-      return null;
-    double unit = 1.0 / items.length;
-    double duration = 1.5 * unit;
-    double start = i * unit;
-    return math.max(0.0, math.min(1.0, (_position - start) / duration));
-  }
-
-  String _inlineStyle() {
-    if (_position == null || _position == 1.0 ||
-        _height == null || _width == null)
-      return null;
-    return '''
-      opacity: ${math.min(1.0, _position * 3.0)};
-      width: ${math.min(_width, _width * (0.5 + _position * 2.0))}px;
-      height: ${math.min(_height, _height * _position * 1.5)}px;''';
-  }
-
-  void _measureSize() {
-    setState(() {
-      var root = getRoot();
-      _width = root.width.round();
-      _height = root.height.round();
-    });
-  }
-
-  UINode build() {
-    int i = 0;
-    List<UINode> children = new List.from(items.map((List<UINode> item) {
-      double opacity = _opacityFor(i);
-      return new PopupMenuItem(key: i++, children: item, opacity: opacity);
-    }));
-
-    return new Material(
-      content: new Container(
-        style: _style,
-        inlineStyle: _inlineStyle(),
-        children: children
-      ),
-      level: level);
-  }
-}