Rationalize Dart mojo and sky package structure

sky/framework/elements/sky-drawer.sky

Index: sky/framework/elements/sky-drawer.sky
diff --git a/sky/framework/elements/sky-drawer.sky b/sky/framework/elements/sky-drawer.sky
deleted file mode 100644
index e22c45ff167d1e9a0a403ad9c2e36e16e5ed7837..0000000000000000000000000000000000000000
--- a/sky/framework/elements/sky-drawer.sky
+++ /dev/null
@@ -1,166 +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 src="shadow.sky" as="shadow" />
-<import src="sky-element.sky" />
-<import src="sky-scrollable.sky" />
-
-<sky-element attributes="level:number">
-<template>
-  <style>
-    #mask {
-      background-color: black;
-      will-change: opacity;
-      position: absolute;
-      top: 0;
-      left: 0;
-      bottom: 0;
-      right: 0;
-    }
-    #content {
-      background-color: #FAFAFA;
-      will-change: transform;
-      position: absolute;
-      z-index: 2;
-      width: 256px;
-      top: 0;
-      left: 0;
-      bottom: 0;
-    }
-  </style>
-  <div id="mask" />
-  <div id="content">
-    <content/>
-  </div>
-</template>
-<script>
-import "../animation/curves.dart";
-import "animation/controller.dart";
-import "animation/timer.dart";
-import "dart:math" as math;
-import "dart:sky";
-
-const double _kWidth = 256.0;
-const double _kMinFlingVelocity = 0.4;
-const double _kMinAnimationDurationMS = 246.0;
-const double _kMaxAnimationDurationMS = 600.0;
-const Cubic _kAnimationCurve = easeOut;
-
-@Tagname('sky-drawer')
-class SkyDrawer extends SkyElement implements AnimationDelegate {
-  Element _mask;
-  Element _content;
-  double _position = 0.0;
-  AnimationController _animation;
-
-  SkyDrawer() {
-    _animation = new AnimationController(this);
-
-    addEventListener('pointerdown', _handlePointerDown);
-    addEventListener('pointermove', _handlePointerMove);
-    addEventListener('pointerup', _handlePointerUp);
-    addEventListener('pointercancel', _handlePointerCancel);
-  }
-
-  void shadowRootReady() {
-    shadow.applyTo(shadowRoot);
-    _mask = shadowRoot.getElementById('mask');
-    _mask.addEventListener('gesturetap', _handleMaskTap);
-    _content = shadowRoot.getElementById('content');
-    _content.addEventListener('gestureflingstart', _handleFlingStart);
-    position = -_kWidth;
-  }
-
-  void toggle() {
-    if (isMostlyClosed)
-      open();
-    else
-      close();
-  }
-
-  void open() {
-    _animateToPosition(0.0);
-  }
-
-  void close() {
-    _animateToPosition(-_kWidth);
-  }
-
-  bool get isClosed => _position <= -_kWidth;
-  bool get isMostlyClosed => _position <= -_kWidth / 2;
-  double get position => _position;
-
-  set position(double value) {
-    double newPosition = math.min(0.0, math.max(value, -_kWidth));
-    _position = newPosition;
-    _content.style['transform'] = 'translateX(${newPosition}px)';
-    _mask.style['opacity'] = '${(newPosition / _kWidth + 1) * 0.25}';
-    style['display'] = isClosed ? 'none' : '';
-  }
-
-  void _settle() {
-    if (isMostlyClosed)
-      close();
-    else
-      open();
-  }
-
-  void _animateToPosition(double targetPosition) {
-    double currentPosition = _position;
-    double distance = (targetPosition - currentPosition).abs();
-    double duration = _kMaxAnimationDurationMS * distance / _kWidth;
-    _animation.start(
-      begin: currentPosition,
-      end: targetPosition,
-      duration: math.max(_kMinAnimationDurationMS, duration),
-      curve: _kAnimationCurve);
-  }
-
-  void updateAnimation(double p) {
-    position = p;
-  }
-
-  void _handleMaskTap(_) {
-    close();
-  }
-
-  void _handlePointerDown(_) {
-    _animation.stop();
-  }
-
-  void _handlePointerMove(PointerEvent event) {
-    position += event.dx;
-  }
-
-  void _handlePointerUp(_) {
-    if (!_animation.isAnimating)
-      _settle();
-  }
-
-  void _handlePointerCancel(_) {
-    if (!_animation.isAnimating)
-      _settle();
-  }
-
-  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 currentPosition = _position;
-    double distance = (targetPosition - currentPosition).abs();
-    double duration = distance / velocityX;
-    _animation.start(
-      begin: currentPosition,
-      end: targetPosition,
-      duration: duration,
-      curve: linear);
-  }
-}
-
-_init(script) => register(script, SkyDrawer);
-</script>
-</sky-element>