Stub out InkWell and implement Sky’s fn2 menu item

sky/sdk/lib/framework/rendering/box.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 'dart:sky' as sky;
 import 'dart:typed_data';
 import 'object.dart';
 import 'package:vector_math/vector_math.dart';
 import 'package:sky/framework/net/image_cache.dart' as image_cache;
 
 // GENERIC BOX RENDERING
 // Anything that has a concept of x, y, width, height is going to derive from this
 
 class EdgeDims {
   // used for e.g. padding
   const EdgeDims(this.top, this.right, this.bottom, this.left);
   const EdgeDims.all(double value)
       : top = value, right = value, bottom = value, left = value;
-
-  const EdgeDims.onlyLeft(double value)
-      : top = 0.0, right = 0.0, bottom = 0.0, left = value;
-  const EdgeDims.onlyRight(double value)
-    : top = 0.0, right = value, bottom = 0.0, left = 0.0;
-  const EdgeDims.onlyTop(double value)
-    : top = value, right = 0.0, bottom = 0.0, left = 0.0;
-  const EdgeDims.onlyBottom(double value)
-    : top = 0.0, right = 0.0, bottom = value, left = 0.0;
+  const EdgeDims.only({ this.top: 0.0,
+                        this.right: 0.0,
+                        this.bottom: 0.0,
+                        this.left: 0.0 });
+  const EdgeDims.symmetric({ double vertical: 0.0,
+                             double horizontal: 0.0 })
+    : top = vertical, left = horizontal, bottom = vertical, right = horizontal;
 
   final double top;
   final double right;
   final double bottom;
   final double left;
 
   operator ==(EdgeDims other) => (top == other.top) ||
                                  (right == other.right) ||
                                  (bottom == other.bottom) ||
                                  (left == other.left);
@@ skipping 617 matching lines @@
 
   void defaultPaint(RenderObjectDisplayList canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }