Refactor fn2.dart, since it breached our 1000-line threshold.

sky/sdk/lib/framework/components2/ink_well.dart

Index: sky/sdk/lib/framework/components2/ink_well.dart
diff --git a/sky/sdk/lib/framework/components2/ink_well.dart b/sky/sdk/lib/framework/components2/ink_well.dart
deleted file mode 100644
index a67a63533c3ac60a644040496eb0bd2bd37950f2..0000000000000000000000000000000000000000
--- a/sky/sdk/lib/framework/components2/ink_well.dart
+++ /dev/null
@@ -1,126 +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 '../animation/animated_value.dart';
-import '../animation/curves.dart';
-import '../fn2.dart';
-import '../rendering/box.dart';
-import '../rendering/flex.dart';
-import '../rendering/object.dart';
-import 'dart:async';
-import 'dart:collection';
-import 'dart:math' as math;
-import 'dart:sky' as sky;
-
-const int _kSplashInitialOpacity = 0x80;
-const double _kSplashInitialDelay = 0.0; // we could delay initially in case the user scrolls
-const double _kSplashInitialSize = 0.0;
-const double _kSplashConfirmedVelocity = 0.3;
-const double _kSplashUnconfirmedVelocity = 0.1;
-
-double _getSplashTargetSize(Size bounds, Point position) {
-  return math.max(math.max(position.x, bounds.width - position.x),
-                  math.max(position.y, bounds.height - position.y));
-}
-
-class InkSplash {
-  InkSplash(this.pointer, this.position, this.well) {
-    _targetRadius = _getSplashTargetSize(well.size, position);
-    double duration = _targetRadius / _kSplashUnconfirmedVelocity;
-    _radius = new AnimatedValue(_kSplashInitialSize, onChange: _handleRadiusChange);
-    _radius.animateTo(_targetRadius, duration, curve: easeOut,
-                      initialDelay: _kSplashInitialDelay);
-  }
-
-  final int pointer;
-  final Point position;
-  final RenderInkWell well;
-
-  double _targetRadius;
-  AnimatedValue _radius;
-
-  void confirm() {
-    double duration = (_targetRadius - _radius.value) / _kSplashConfirmedVelocity;
-    if (duration <= 0.0)
-      return;
-    _radius.animateTo(_targetRadius, duration, curve: easeOut);
-  }
-
-  void _handleRadiusChange() {
-    if (_radius.value == _targetRadius)
-      well._splashes.remove(this);
-    well.markNeedsPaint();
-  }
-
-  void paint(RenderObjectDisplayList canvas) {
-    int opacity = (_kSplashInitialOpacity * (1.0 - (_radius.value / _targetRadius))).floor();
-    sky.Paint paint = new sky.Paint()..color = new sky.Color(opacity << 24);
-    canvas.drawCircle(position.x, position.y, _radius.value, paint);
-  }
-}
-
-class RenderInkWell extends RenderProxyBox {
-  RenderInkWell({ RenderBox child }) : super(child);
-
-  final List<InkSplash> _splashes = new List<InkSplash>();
-
-  void handleEvent(sky.Event event, BoxHitTestEntry entry) {
-    switch (event.type) {
-      case 'gesturetapdown':
-        // TODO(abarth): We should position the splash at the location of the tap.
-        _startSplash(event.primaryPointer, entry.localPosition);
-        break;
-      case 'gesturetap':
-        _confirmSplash(event.primaryPointer);
-        break;
-    }
-  }
-
-  void _startSplash(int pointer, Point position) {
-    _splashes.add(new InkSplash(pointer, position, this));
-    markNeedsPaint();
-  }
-
-  void _confirmSplash(int pointer) {
-    _splashes.where((splash) => splash.pointer == pointer)
-             .forEach((splash) { splash.confirm(); });
-    markNeedsPaint();
-  }
-
-  void paint(RenderObjectDisplayList canvas) {
-    if (!_splashes.isEmpty) {
-      canvas.save();
-      canvas.clipRect(new Rect.fromSize(size));
-      for (InkSplash splash in _splashes)
-        splash.paint(canvas);
-      canvas.restore();
-    }
-    super.paint(canvas);
-  }
-}
-
-class InkWellWrapper extends OneChildRenderObjectWrapper {
-  InkWellWrapper({ UINode child, Object key })
-    : super(child: child, key: key);
-
-  RenderInkWell get root { RenderInkWell result = super.root; return result; }
-
-  RenderInkWell createNode() => new RenderInkWell();
-}
-
-class InkWell extends Component {
-  InkWell({ Object key, this.children }) : super(key: key);
-
-  final List<UINode> children;
-
-  UINode build() {
-    return new InkWellWrapper(
-      child: new Flex(
-        children,
-        direction: FlexDirection.horizontal,
-        justifyContent: FlexJustifyContent.center
-      )
-    );
-  }
-}