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

This moves input.dart to editing2/, since that way we can define the layering as strictly unidirectional.
It also reorders a bunch of imports to fit the style guide.
I removed the old remnants of the widgets example, and put the fn2 examples into the examples/widgets/ directory, to parallel the framework directory names.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1177243002.

examples/stocks2/lib/stock_app.dart

@@ -2,30 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/framework/components2/tool_bar.dart';
-import 'package:sky/framework/components2/drawer.dart';
-import 'package:sky/framework/components2/drawer_header.dart';
-import 'package:sky/framework/components2/floating_action_button.dart';
-import 'package:sky/framework/components2/icon.dart';
-import 'package:sky/framework/components2/icon_button.dart';
-import 'package:sky/framework/components2/menu_divider.dart';
-import 'package:sky/framework/components2/menu_item.dart';
-import 'package:sky/framework/components2/input.dart';
-import 'package:sky/framework/components2/modal_overlay.dart';
-import 'package:sky/framework/components2/popup_menu.dart';
-import 'package:sky/framework/components2/radio.dart';
-import 'package:sky/framework/components2/scaffold.dart';
-import 'package:sky/framework/fn2.dart';
-import 'package:sky/framework/theme2/typography.dart' as typography;
+import 'package:sky/framework/editing2/input.dart';
 import 'package:sky/framework/theme2/colors.dart' as colors;
+import 'package:sky/framework/widgets/drawer.dart';
+import 'package:sky/framework/widgets/drawer_header.dart';
+import 'package:sky/framework/widgets/floating_action_button.dart';
+import 'package:sky/framework/widgets/icon.dart';
+import 'package:sky/framework/widgets/icon_button.dart';
+import 'package:sky/framework/widgets/menu_divider.dart';
+import 'package:sky/framework/widgets/menu_item.dart';
+import 'package:sky/framework/widgets/modal_overlay.dart';
+import 'package:sky/framework/widgets/popup_menu.dart';
+import 'package:sky/framework/widgets/radio.dart';
+import 'package:sky/framework/widgets/scaffold.dart';
+import 'package:sky/framework/widgets/tool_bar.dart';
+import 'package:sky/framework/widgets/wrappers.dart';
+
 import 'stock_data.dart';
-import 'package:sky/framework/rendering/box.dart';
 import 'stock_list.dart';
 import 'stock_menu.dart';
 
-import 'dart:async';
-import 'dart:sky' as sky;
-
 enum StockMode { optimistic, pessimistic }
 
 class StocksApp extends App {

examples/stocks2/lib/stock_arrow.dart

@@ -2,14 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/framework/fn2.dart';
-import 'package:vector_math/vector_math.dart';
+import 'dart:math' as math;
+import 'dart:sky' as sky;
+
 import 'package:sky/framework/rendering/box.dart';
 import 'package:sky/framework/rendering/object.dart';
 import 'package:sky/framework/theme2/colors.dart' as colors;
-
-import 'dart:math' as math;
-import 'dart:sky' as sky;
+import 'package:sky/framework/widgets/wrappers.dart';
 
 class StockArrow extends Component {
 

examples/stocks2/lib/stock_data.dart

@@ -4,6 +4,7 @@
 
 import 'dart:convert';
 import 'dart:math';
+
 import 'package:sky/framework/net/fetch.dart';
 
 // Snapshot from http://www.nasdaq.com/screening/company-list.aspx

examples/stocks2/lib/stock_list.dart

@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/framework/components2/fixed_height_scrollable.dart';
-import 'package:sky/framework/fn2.dart';
+import 'package:sky/framework/widgets/fixed_height_scrollable.dart';
+import 'package:sky/framework/widgets/wrappers.dart';
+
 import 'stock_data.dart';
 import 'stock_row.dart';
 

examples/stocks2/lib/stock_menu.dart

@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/framework/fn2.dart';
-import 'package:sky/framework/components2/popup_menu.dart';
-import 'package:sky/framework/components2/checkbox.dart';
+import 'package:sky/framework/widgets/checkbox.dart';
+import 'package:sky/framework/widgets/popup_menu.dart';
+import 'package:sky/framework/widgets/wrappers.dart';
 import 'package:sky/framework/theme/view_configuration.dart';
 
 class StockMenu extends Component {

examples/stocks2/lib/stock_row.dart

@@ -3,11 +3,11 @@
 // found in the LICENSE file.
 
 import 'dart:sky' as sky;
-import 'package:sky/framework/components2/ink_well.dart';
-import 'package:sky/framework/fn2.dart';
-import 'package:sky/framework/rendering/flex.dart';
+
 import 'package:sky/framework/rendering/box.dart';
-import 'package:sky/framework/theme/typography.dart' as typography;
+import 'package:sky/framework/widgets/wrappers.dart';
+import 'package:sky/framework/widgets/ink_well.dart';
+
 import 'stock_arrow.dart';
 import 'stock_data.dart';
 

examples/fn2/container.dart → examples/widgets/container.dart

@@ -3,8 +3,11 @@
 // found in the LICENSE file.
 
 import 'dart:sky' as sky;
-import 'package:sky/framework/fn2.dart';
+
 import 'package:sky/framework/rendering/box.dart';
+import 'package:sky/framework/widgets/ui_node.dart';
+import 'package:sky/framework/widgets/wrappers.dart';
+
 import '../lib/solid_color_box.dart';
 
 class Rectangle extends RenderObjectWrapper {
@@ -29,7 +32,7 @@ class ContainerApp extends App {
           child: new Block([
             new Container(
               decoration: new BoxDecoration(backgroundColor: const sky.Color(0xFFFFFF00)),
-              height: 20.0,
+              height: 20.0
             ),
             new Image(src: "https://www.dartlang.org/logos/dart-logo.png",
               size: new sky.Size(300.0, 300.0),

examples/fn2/hello_fn2.dart → examples/widgets/hello_widgets.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/framework/fn2.dart';
+import 'package:sky/framework/widgets/wrappers.dart';
 
 class HelloWorldApp extends App {
   UINode build() {
@@ -12,4 +12,4 @@ class HelloWorldApp extends App {
 
 void main() {
   new HelloWorldApp();
-}
\ No newline at end of file
+}

examples/widgets/main.sky

-#!mojo mojo:sky_viewer
-<!--
-// 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.
--->
-<sky>
-<import src="/sky/framework/debug/shake-to-reload.sky" />
-<script>
-import 'widgets_app.dart';
-void main() {
-  new WidgetsApp();
-}
-</script>
-</sky>

examples/widgets/pubspec.yaml

-name: widgets
-dependencies:
- sky: any