Rationalize Dart mojo and sky package structure

sky/framework/components/drawer.dart

Index: sky/framework/components/drawer.dart
diff --git a/sky/framework/components/drawer.dart b/sky/framework/components/drawer.dart
deleted file mode 100644
index 5959bab73c4c11753120738a7bcf340061bc336d..0000000000000000000000000000000000000000
--- a/sky/framework/components/drawer.dart
+++ /dev/null
@@ -1,156 +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 '../animation/curves.dart';
-import '../fn.dart';
-import '../theme/colors.dart';
-import 'dart:math' as math;
-import 'dart:sky' as sky;
-import 'material.dart';
-
-const double _kWidth = 304.0;
-const double _kMinFlingVelocity = 0.4;
-const double _kBaseSettleDurationMS = 246.0;
-const double _kMaxSettleDurationMS = 600.0;
-const Curve _kAnimationCurve = parabolicRise;
-
-typedef void DrawerStatusChangeHandler (bool showing);
-
-class DrawerController {
-
-  DrawerController(this.onStatusChange) {
-    position = new AnimatedValue(-_kWidth, onChange: _checkValue);
-  }
-  final DrawerStatusChangeHandler onStatusChange;
-  AnimatedValue position;
-
-  bool _oldClosedState = true;
-  void _checkValue() {
-    var newClosedState = isClosed;
-    if (onStatusChange != null && _oldClosedState != newClosedState) {
-      onStatusChange(!newClosedState);
-      _oldClosedState = newClosedState;
-    }
-  }
-
-  bool get isClosed => position.value == -_kWidth;
-  bool get _isMostlyClosed => position.value <= -_kWidth / 2;
-  void toggle(_) => _isMostlyClosed ? _open() : _close();
-
-  void handleMaskTap(_) => _close();
-  void handlePointerDown(_) => position.stop();
-
-  void handlePointerMove(sky.PointerEvent event) {
-    if (position.isAnimating)
-      return;
-    position.value = math.min(0.0, math.max(position.value + event.dx, -_kWidth));
-  }
-
-  void handlePointerUp(_) {
-    if (!position.isAnimating)
-      _settle();
-  }
-
-  void handlePointerCancel(_) {
-    if (!position.isAnimating)
-      _settle();
-  }
-
-  void _open() => _animateToPosition(0.0);
-
-  void _close() => _animateToPosition(-_kWidth);
-
-  void _settle() => _isMostlyClosed ? _close() : _open();
-
-  void _animateToPosition(double targetPosition) {
-    double distance = (targetPosition - position.value).abs();
-    if (distance != 0) {
-      double targetDuration = distance / _kWidth * _kBaseSettleDurationMS;
-      double duration = math.min(targetDuration, _kMaxSettleDurationMS);
-      position.animateTo(targetPosition, duration, curve: _kAnimationCurve);
-    }
-  }
-
-  void handleFlingStart(event) {
-    double direction = event.velocityX.sign;
-    double velocityX = event.velocityX.abs() / 1000;
-    if (velocityX < _kMinFlingVelocity)
-      return;
-
-    double targetPosition = direction < 0.0 ? -_kWidth : 0.0;
-    double distance = (targetPosition - position.value).abs();
-    double duration = distance / velocityX;
-
-    if (distance > 0)
-      position.animateTo(targetPosition, duration, curve: linear);
-  }
-}
-
-class Drawer extends AnimatedComponent {
-  // TODO(abarth): We need a better way to become a container for absolutely
-  // positioned elements.
-  static final Style _style = new Style('''
-    transform: translateX(0);''');
-
-  static final Style _maskStyle = new Style('''
-    background-color: black;
-    will-change: opacity;'''
-  );
-
-  static final Style _contentStyle = new Style('''
-    background-color: ${Grey[50]};
-    will-change: transform;
-    width: ${_kWidth}px;'''
-  );
-
-  List<UINode> children;
-  int level;
-  DrawerController controller;
-
-  double _position;
-
-  Drawer({
-    Object key,
-    this.controller,
-    this.children,
-    this.level: 0
-  }) : super(key: key) {
-    animateField(controller.position, #_position);
-  }
-
-  UINode build() {
-    String maskInlineStyle = 'opacity: ${(_position / _kWidth + 1) * 0.5}';
-    String contentInlineStyle = 'transform: translateX(${_position}px)';
-
-    var mask = new EventListenerNode(
-      new Container(
-        style: _maskStyle,
-        inlineStyle: maskInlineStyle
-      ),
-      onGestureTap: controller.handleMaskTap,
-      onGestureFlingStart: controller.handleFlingStart
-    );
-
-    Material content = new Material(
-      content: new Container(
-        style: _contentStyle,
-        inlineStyle: contentInlineStyle,
-        children: children
-      ),
-      level: level);
-
-    return new EventListenerNode(
-      new FillStackContainer(
-        style: _style,
-        children: [ mask, content ]
-      ),
-      onPointerDown: controller.handlePointerDown,
-      onPointerMove: controller.handlePointerMove,
-      onPointerUp: controller.handlePointerUp,
-      onPointerCancel: controller.handlePointerCancel
-    );
-  }
-}