Version 0 of TabLabel, Tab, and TabBar components

sky/sdk/lib/rendering/block.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 'dart:math' as math;
 
 import 'box.dart';
 import 'object.dart';
 
 class BlockParentData extends BoxParentData with ContainerParentDataMixin<RenderBox> { }
@@ skipping 10 matching lines @@
     addAll(children);
   }
 
   void setParentData(RenderBox child) {
     if (child.parentData is! BlockParentData)
       child.parentData = new BlockParentData();
   }
 
   double getMinIntrinsicWidth(BoxConstraints constraints) {
     double width = 0.0;
-    BoxConstraints innerConstraints = new BoxConstraints(
-        minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
+    BoxConstraints innerConstraints = constraints.widthConstraints();
     RenderBox child = firstChild;
     while (child != null) {
       width = math.max(width, child.getMinIntrinsicWidth(innerConstraints));
+      assert(child.parentData is BlockParentData);
       child = child.parentData.nextSibling;
     }
     return width;
   }
 
   double getMaxIntrinsicWidth(BoxConstraints constraints) {
     double width = 0.0;
-    BoxConstraints innerConstraints = new BoxConstraints(
-        minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
+    BoxConstraints innerConstraints = constraints.widthConstraints();
     RenderBox child = firstChild;
     while (child != null) {
       width = math.max(width, child.getMaxIntrinsicWidth(innerConstraints));
+      assert(child.parentData is BlockParentData);
       child = child.parentData.nextSibling;
     }
     return width;
   }
 
   BoxConstraints _getInnerConstraintsForWidth(double width) {
     return new BoxConstraints(minWidth: width, maxWidth: width);
   }
 
   double _getIntrinsicHeight(BoxConstraints constraints) {
     double height = 0.0;
     double width = constraints.constrainWidth(constraints.maxWidth);
     BoxConstraints innerConstraints = _getInnerConstraintsForWidth(width);
     RenderBox child = firstChild;
     while (child != null) {
       double childHeight = child.getMinIntrinsicHeight(innerConstraints);
       assert(childHeight == child.getMaxIntrinsicHeight(innerConstraints));
       height += childHeight;
+      assert(child.parentData is BlockParentData);
       child = child.parentData.nextSibling;
     }
     return height;
   }
 
   double getMinIntrinsicHeight(BoxConstraints constraints) {
     return _getIntrinsicHeight(constraints);
   }
 
   double getMaxIntrinsicHeight(BoxConstraints constraints) {
@@ skipping 26 matching lines @@
   void hitTestChildren(HitTestResult result, { Point position }) {
     defaultHitTestChildren(result, position: position);
   }
 
   void paint(RenderCanvas canvas) {
     defaultPaint(canvas);
   }
 
 }