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

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

Index: sky/sdk/lib/framework/components2/scaffold.dart
diff --git a/sky/sdk/lib/framework/components2/scaffold.dart b/sky/sdk/lib/framework/components2/scaffold.dart
deleted file mode 100644
index 1ba9107400e92f4239ceccaa472cceb6e808dac6..0000000000000000000000000000000000000000
--- a/sky/sdk/lib/framework/components2/scaffold.dart
+++ /dev/null
@@ -1,217 +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 '../fn2.dart';
-import '../rendering/box.dart';
-import '../rendering/object.dart';
-import '../theme2/view_configuration.dart';
-
-enum ScaffoldSlots {
-  toolbar,
-  body,
-  statusBar,
-  drawer,
-  floatingActionButton
-}
-
-class RenderScaffold extends RenderBox {
-
-  RenderScaffold({
-    RenderBox toolbar,
-    RenderBox body,
-    RenderBox statusBar,
-    RenderBox drawer,
-    RenderBox floatingActionButton
-  }) {
-    this[ScaffoldSlots.toolbar] = toolbar;
-    this[ScaffoldSlots.body] = body;
-    this[ScaffoldSlots.statusBar] = statusBar;
-    this[ScaffoldSlots.drawer] = drawer;
-    this[ScaffoldSlots.floatingActionButton] = floatingActionButton;
-  }
-
-  Map<ScaffoldSlots, RenderBox> _slots = new Map<ScaffoldSlots, RenderBox>();
-  RenderBox operator[] (ScaffoldSlots slot) => _slots[slot];
-  void operator[]= (ScaffoldSlots slot, RenderBox value) {
-    RenderBox old = _slots[slot];
-    if (old == value)
-      return;
-    if (old != null)
-      dropChild(old);
-    _slots[slot] = value;
-    if (value != null)
-      adoptChild(value);
-    markNeedsLayout();
-  }
-
-  void attachChildren() {
-    for (ScaffoldSlots slot in ScaffoldSlots.values) {
-      RenderBox box = _slots[slot];
-      if (box != null)
-        box.attach();
-    }
-  }
-
-  void detachChildren() {
-    for (ScaffoldSlots slot in ScaffoldSlots.values) {
-      RenderBox box = _slots[slot];
-      if (box != null)
-        box.detach();
-    }
-  }
-
-  ScaffoldSlots remove(RenderBox child) {
-    assert(child != null);
-    for (ScaffoldSlots slot in ScaffoldSlots.values) {
-      if (_slots[slot] == child) {
-        this[slot] = null;
-        return slot;
-      }
-    }
-    return null;
-  }
-
-  bool get sizedByParent => true;
-  void performResize() {
-    size = constraints.constrain(Size.infinite);
-    assert(size.width < double.INFINITY);
-    assert(size.height < double.INFINITY);
-  }
-
-  // TODO(eseidel): These change based on device size!
-  // http://www.google.com/design/spec/layout/metrics-keylines.html#metrics-keylines-keylines-spacing
-  static const kButtonX = 16.0; // left from right edge of body
-  static const kButtonY = 16.0; // up from bottom edge of body
-
-  void performLayout() {
-    double bodyHeight = size.height;
-    double bodyPosition = 0.0;
-    if (_slots[ScaffoldSlots.toolbar] != null) {
-      RenderBox toolbar = _slots[ScaffoldSlots.toolbar];
-      double toolbarHeight = kToolBarHeight + kNotificationAreaHeight;
-      toolbar.layout(new BoxConstraints.tight(new Size(size.width, toolbarHeight)));
-      assert(toolbar.parentData is BoxParentData);
-      toolbar.parentData.position = Point.origin;
-      bodyPosition += toolbarHeight;
-      bodyHeight -= toolbarHeight;
-    }
-    if (_slots[ScaffoldSlots.statusBar] != null) {
-      RenderBox statusBar = _slots[ScaffoldSlots.statusBar];
-      statusBar.layout(new BoxConstraints.tight(new Size(size.width, kStatusBarHeight)));
-      assert(statusBar.parentData is BoxParentData);
-      statusBar.parentData.position = new Point(0.0, size.height - kStatusBarHeight);
-      bodyHeight -= kStatusBarHeight;
-    }
-    if (_slots[ScaffoldSlots.body] != null) {
-      RenderBox body = _slots[ScaffoldSlots.body];
-      body.layout(new BoxConstraints.tight(new Size(size.width, bodyHeight)));
-      assert(body.parentData is BoxParentData);
-      body.parentData.position = new Point(0.0, bodyPosition);
-    }
-    if (_slots[ScaffoldSlots.drawer] != null) {
-      RenderBox drawer = _slots[ScaffoldSlots.drawer];
-      drawer.layout(new BoxConstraints(minWidth: 0.0, maxWidth: size.width, minHeight: size.height, maxHeight: size.height));
-      assert(drawer.parentData is BoxParentData);
-      drawer.parentData.position = Point.origin;
-    }
-    if (_slots[ScaffoldSlots.floatingActionButton] != null) {
-      RenderBox floatingActionButton = _slots[ScaffoldSlots.floatingActionButton];
-      Size area = new Size(size.width - kButtonX, size.height - kButtonY);
-      floatingActionButton.layout(new BoxConstraints.loose(area));
-      assert(floatingActionButton.parentData is BoxParentData);
-      floatingActionButton.parentData.position = (area - floatingActionButton.size).toPoint();
-    }
-  }
-
-  void paint(RenderObjectDisplayList canvas) {
-    for (ScaffoldSlots slot in [ScaffoldSlots.body, ScaffoldSlots.statusBar, ScaffoldSlots.toolbar, ScaffoldSlots.floatingActionButton, ScaffoldSlots.drawer]) {
-      RenderBox box = _slots[slot];
-      if (box != null) {
-        assert(box.parentData is BoxParentData);
-        canvas.paintChild(box, box.parentData.position);
-      }
-    }
-  }
-
-  void hitTestChildren(HitTestResult result, { Point position }) {
-    for (ScaffoldSlots slot in [ScaffoldSlots.drawer, ScaffoldSlots.floatingActionButton, ScaffoldSlots.toolbar, ScaffoldSlots.statusBar, ScaffoldSlots.body]) {
-      RenderBox box = _slots[slot];
-      if (box != null) {
-        assert(box.parentData is BoxParentData);
-        if (new Rect.fromPointAndSize(box.parentData.position, box.size).contains(position)) {
-          if (box.hitTest(result, position: (position - box.parentData.position).toPoint()))
-            return;
-        }
-      }
-    }
-  }
-
-  String debugDescribeChildren(String prefix) {
-    return _slots.keys.map((slot) => '${prefix}${slot}: ${_slots[slot].toString(prefix)}').join();
-  }
-}
-
-class Scaffold extends RenderObjectWrapper {
-
-  // static final Style _style = new Style('''
-  //   ${typography.typeface};
-  //   ${typography.black.body1};''');
-
-  Scaffold({
-    Object key,
-    UINode toolbar,
-    UINode body,
-    UINode statusBar,
-    UINode drawer,
-    UINode floatingActionButton
-  }) : _toolbar = toolbar,
-       _body = body,
-       _statusBar = statusBar,
-       _drawer = drawer,
-       _floatingActionButton = floatingActionButton,
-       super(key: key);
-
-  UINode _toolbar;
-  UINode _body;
-  UINode _statusBar;
-  UINode _drawer;
-  UINode _floatingActionButton;
-
-  RenderScaffold get root { RenderScaffold result = super.root; return result; }
-  RenderScaffold createNode() => new RenderScaffold();
-
-  void insert(RenderObjectWrapper child, ScaffoldSlots slot) {
-    root[slot] = child != null ? child.root : null;
-  }
-
-  void removeChild(UINode node) {
-    assert(node != null);
-    root.remove(node.root);
-    super.removeChild(node);
-  }
-
-  void remove() {
-    if (_toolbar != null)
-      removeChild(_toolbar);
-    if (_body != null)
-      removeChild(_body);
-    if (_statusBar != null)
-      removeChild(_statusBar);
-    if (_drawer != null)
-      removeChild(_drawer);
-    if (_floatingActionButton != null)
-      removeChild(_floatingActionButton);
-    super.remove();
-  }
-
-  void syncRenderObject(UINode old) {
-    super.syncRenderObject(old);
-    _toolbar = syncChild(_toolbar, old is Scaffold ? old._toolbar : null, ScaffoldSlots.toolbar);
-    _body = syncChild(_body, old is Scaffold ? old._body : null, ScaffoldSlots.body);
-    _statusBar = syncChild(_statusBar, old is Scaffold ? old._statusBar : null, ScaffoldSlots.statusBar);
-    _drawer = syncChild(_drawer, old is Scaffold ? old._drawer : null, ScaffoldSlots.drawer);
-    _floatingActionButton = syncChild(_floatingActionButton, old is Scaffold ? old._floatingActionButton : null, ScaffoldSlots.floatingActionButton);
-  }
-
-}