Refactor layout/relayout into a single method.

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

 // 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 '../layout2.dart';
 import '../theme/typography.dart' as typography;
 
 // RenderNode
 class RenderScaffold extends RenderDecoratedBox {
@@ skipping 61 matching lines @@
   RenderBox get floatingActionButton => _floatingActionButton;
   void set floatingActionButton (RenderBox value) {
     if (_floatingActionButton != null)
       dropChild(_floatingActionButton);
     _floatingActionButton = value;
     if (_floatingActionButton != null)
       adoptChild(_floatingActionButton);
     markNeedsLayout();
   }
 
-  void layout(BoxConstraints constraints, { RenderNode relayoutSubtreeRoot }) {
+  bool get sizedByParent => true;
+  void performResize() {
     width = constraints.constrainWidth(double.INFINITY);
     assert(width < double.INFINITY);
     height = constraints.constrainHeight(double.INFINITY);
     assert(height < double.INFINITY);
-    relayout();
   }
 
   static const kToolbarHeight = 100.0;
   static const kStatusbarHeight = 50.0;
   static const kButtonX = -16.0; // from right edge of body
   static const kButtonY = -16.0; // from bottom edge of body
 
-  void relayout() {
+  void performLayout() {
     double bodyHeight = height;
     double bodyPosition = 0.0;
     if (toolbar != null) {
       toolbar.layout(new BoxConstraints.tight(width: width, height: kToolbarHeight));
       assert(toolbar.parentData is BoxParentData);
       toolbar.parentData.x = 0.0;
       toolbar.parentData.y = 0.0;
       bodyPosition = kToolbarHeight;
       bodyHeight -= kToolbarHeight;
     }
@@ skipping 15 matching lines @@
       assert(drawer.parentData is BoxParentData);
       drawer.parentData.x = 0.0;
       drawer.parentData.y = 0.0;
     }
     if (floatingActionButton != null) {
       floatingActionButton.layout(new BoxConstraints(minWidth: 0.0, maxWidth: width, minHeight: height, maxHeight: height));
       assert(floatingActionButton.parentData is BoxParentData);
       floatingActionButton.parentData.x = width - xButtonX;
       floatingActionButton.parentData.y = bodyPosition + bodyHeight - kButtonY;
     }
-    layoutDone();
   }
 
   void paint(RenderNodeDisplayList canvas) {
     if (body != null)
       canvas.paintChild(body, (body.parentData as BoxParentData).x, (body.parentData as BoxParentData).y);
     if (statusbar != null)
       canvas.paintChild(statusbar, (statusbar.parentData as BoxParentData).x, (statusbar.parentData as BoxParentData).y);
     if (toolbar != null)
       canvas.paintChild(toolbar, (toolbar.parentData as BoxParentData).x, (toolbar.parentData as BoxParentData).y);
     if (floatingActionButton != null)
@@ skipping 78 matching lines @@
   void syncRenderNode(UINode old) {
     super.syncRenderNode(old);
     syncChild(toolbar, old is Scaffold ? old.toolbar : null, #toolbar);
     syncChild(body, old is Scaffold ? old.body : null, #body);
     syncChild(statusbar, old is Scaffold ? old.statusbar : null, #statusbar);
     syncChild(drawer, old is Scaffold ? old.drawer : null, #drawer);
     syncChild(floatingActionButton, old is Scaffold ? old.floatingActionButton : null, #floatingActionButton);
   }
 
 }