Split layout2.dart into several files

sky/sdk/lib/framework/rendering/render_paragraph.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:sky' as sky;
+import 'render_box.dart';
+import 'render_node.dart';
+
+class RenderInline extends RenderNode {
+  String data;
+
+  RenderInline(this.data);
+}
+
+class RenderParagraph extends RenderBox {
+
+  RenderParagraph({
+    String text,
+    int color
+  }) : _color = color {
+    _layoutRoot.rootElement = _document.createElement('p');
+    this.text = text;
+  }
+
+  final sky.Document _document = new sky.Document();
+  final sky.LayoutRoot _layoutRoot = new sky.LayoutRoot();
+
+  String get text => (_layoutRoot.rootElement.firstChild as sky.Text).data;
+  void set text (String value) {
+    _layoutRoot.rootElement.setChild(_document.createText(value));
+    markNeedsLayout();
+  }
+
+  int _color = 0xFF000000;
+  int get color => _color;
+  void set color (int value) {
+    if (_color != value) {
+      _color = value;
+      markNeedsPaint();
+    }
+  }
+
+  sky.Size getIntrinsicDimensions(BoxConstraints constraints) {
+    assert(false);
+    return null;
+    // we don't currently support this for RenderParagraph
+  }
+
+  void performLayout() {
+    _layoutRoot.maxWidth = constraints.maxWidth;
+    _layoutRoot.minWidth = constraints.minWidth;
+    _layoutRoot.minHeight = constraints.minHeight;
+    _layoutRoot.maxHeight = constraints.maxHeight;
+    _layoutRoot.layout();
+    size = constraints.constrain(new sky.Size(_layoutRoot.rootElement.width, _layoutRoot.rootElement.height));
+  }
+
+  void paint(RenderNodeDisplayList canvas) {
+    // _layoutRoot.rootElement.style['color'] = 'rgba(' + ...color... + ')';
+    _layoutRoot.paint(canvas);
+  }
+
+  // we should probably expose a way to do precise (inter-glpyh) hit testing
+}