Move fn.dart into /sky/framework

It's awkward to work on fn.dart in the examples directory so this CL moves it
to /sky/framework. Also, I've merged the whole library into one file instead of
using the |part| mechanism. The whole thing isn't that big.

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/987463002

examples/fn/lib/component.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.
-
-part of fn;
-
-List<Component> _dirtyComponents = new List<Component>();
-bool _renderScheduled = false;
-
-void _renderDirtyComponents() {
-  Stopwatch sw = new Stopwatch()..start();
-
-  _dirtyComponents.sort((a, b) => a._order - b._order);
-  for (var comp in _dirtyComponents) {
-    comp._renderIfDirty();
-  }
-
-  _dirtyComponents.clear();
-  _renderScheduled = false;
-  sw.stop();
-  print("Render took ${sw.elapsedMicroseconds} microseconds");
-}
-
-void _scheduleComponentForRender(Component c) {
-  _dirtyComponents.add(c);
-
-  if (!_renderScheduled) {
-    _renderScheduled = true;
-    new Future.microtask(_renderDirtyComponents);
-  }
-}
-
-abstract class Component extends Node {
-  bool _dirty = true; // components begin dirty because they haven't rendered.
-  Node _rendered = null;
-  bool _removed = false;
-  final int _order;
-  static int _currentOrder = 0;
-  bool _stateful;
-  static Component _currentlyRendering;
-
-  Component({ Object key, bool stateful })
-      : _stateful = stateful != null ? stateful : false,
-        _order = _currentOrder + 1,
-        super(key:key);
-
-  void willUnmount() {}
-
-  void _remove() {
-    assert(_rendered != null);
-    assert(_root != null);
-    willUnmount();
-    _rendered._remove();
-    _rendered = null;
-    _root = null;
-    _removed = true;
-  }
-
-  // TODO(rafaelw): It seems wrong to expose DOM at all. This is presently
-  // needed to get sizing info.
-  sky.Node getRoot() => _root;
-
-  bool _sync(Node old, sky.Node host, sky.Node insertBefore) {
-    Component oldComponent = old as Component;
-
-    if (oldComponent == null || oldComponent == this) {
-      _renderInternal(host, insertBefore);
-      return false;
-    }
-
-    assert(oldComponent != null);
-    assert(_dirty);
-    assert(_rendered == null);
-
-    if (oldComponent._stateful) {
-      _stateful = false; // prevent iloop from _renderInternal below.
-
-      reflect.copyPublicFields(this, oldComponent);
-
-      oldComponent._dirty = true;
-      _dirty = false;
-
-      oldComponent._renderInternal(host, insertBefore);
-      return true;  // Must retain old component
-    }
-
-    _rendered = oldComponent._rendered;
-    _renderInternal(host, insertBefore);
-    return false;
-  }
-
-  void _renderInternal(sky.Node host, sky.Node insertBefore) {
-    if (!_dirty) {
-      assert(_rendered != null);
-      return;
-    }
-
-    var oldRendered = _rendered;
-    int lastOrder = _currentOrder;
-    _currentOrder = _order;
-    _currentlyRendering = this;
-    _rendered = render();
-    _currentlyRendering = null;
-    _currentOrder = lastOrder;
-
-    _rendered.events.addAll(events);
-
-    _dirty = false;
-
-    // TODO(rafaelw): This prevents components from returning different node
-    // types as their root node at different times. Consider relaxing.
-    assert(oldRendered == null ||
-           _rendered.runtimeType == oldRendered.runtimeType);
-
-    if (_rendered._sync(oldRendered, host, insertBefore)) {
-      _rendered = oldRendered; // retain stateful component
-    }
-    _root = _rendered._root;
-    assert(_rendered._root is sky.Node);
-  }
-
-  void _renderIfDirty() {
-    assert(_rendered != null);
-    assert(!_removed);
-
-    var rendered = _rendered;
-    while (rendered is Component) {
-      rendered = rendered._rendered;
-    }
-    sky.Node root = rendered._root;
-
-    _renderInternal(root.parentNode, root.nextSibling);
-  }
-
-  void setState(Function fn()) {
-    assert(_rendered != null); // cannot setState before mounting.
-    _stateful = true;
-    fn();
-    if (_currentlyRendering != this) {
-      _dirty = true;
-      _scheduleComponentForRender(this);
-    }
-  }
-
-  Node render();
-}
-
-abstract class App extends Component {
-  sky.Node _host = null;
-  App()
-    : super(stateful: true) {
-
-    _host = sky.document.createElement('div');
-    sky.document.appendChild(_host);
-
-    new Future.microtask(() {
-      Stopwatch sw = new Stopwatch()..start();
-      _sync(null, _host, null);
-      assert(_root is sky.Node);
-      sw.stop();
-      print("Initial render: ${sw.elapsedMicroseconds} microseconds");
-    });
-  }
-}

examples/fn/lib/event.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.
-
-part of fn;
-
-class EventHandler {
-  final String type;
-  final sky.EventListener listener;
-
-  EventHandler(this.type, this.listener);
-}
-
-class EventMap {
-  final List<EventHandler> _handlers = new List<EventHandler>();
-
-  void listen(String type, sky.EventListener listener) {
-    assert(listener != null);
-    _handlers.add(new EventHandler(type, listener));
-  }
-
-  void addAll(EventMap events) {
-    _handlers.addAll(events._handlers);
-  }
-}

examples/fn/lib/fn.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.
-
-library fn;
-
-import 'dart:async';
-import 'dart:collection';
-import 'dart:sky' as sky;
-import 'reflect.dart' as reflect;
-
-part 'component.dart';
-part 'event.dart';
-part 'node.dart';
-part 'style.dart';
-
-bool _checkedMode;
-
-bool _debugWarnings() {
-  void testFn(double i) {}
-
-  if (_checkedMode == null) {
-    _checkedMode = false;
-    try {
-      testFn('not a double');
-    } catch (ex) {
-      _checkedMode = true;
-    }
-  }
-
-  return _checkedMode;
-}

examples/fn/lib/reflect.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.
-
-library reflect;
-
-import 'dart:mirrors';
-import 'dart:collection';
-
-final HashMap<ClassMirror, List> _fieldCache = new HashMap<ClassMirror, List>();
-
-List<Symbol> _getPublicFields(ClassMirror mirror) {
-  return _fieldCache.putIfAbsent(mirror, () {
-    List<Symbol> fields = new List<Symbol>();
-
-    while (mirror != null) {
-      var decls = mirror.declarations;
-      fields.addAll(decls.keys.where((symbol) {
-        var mirror = decls[symbol];
-        if (mirror is! VariableMirror) {
-          return false;
-        }
-
-        var vMirror = mirror as VariableMirror;
-        return !vMirror.isPrivate && !vMirror.isStatic && !vMirror.isFinal;
-      }));
-
-      mirror = mirror.superclass;
-    }
-
-    return fields;
-  });
-}
-
-void copyPublicFields(Object source, Object target) {
-  assert(source.runtimeType == target.runtimeType);
-
-  var sourceMirror = reflect(source);
-  var targetMirror = reflect(target);
-  for (var symbol in _getPublicFields(sourceMirror.type)) {
-    targetMirror.setField(symbol, sourceMirror.getField(symbol).reflectee);
-  }
-}

examples/fn/lib/style.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.
-
-part of fn;
-
-class Style {
-  final String _className;
-  static final Map<String, Style> _cache = new HashMap<String, Style>();
-
-  static int nextStyleId = 1;
-
-  static String nextClassName(String styles) {
-    assert(sky.document != null);
-    String className = "style$nextStyleId";
-    nextStyleId++;
-
-    sky.Element styleNode = sky.document.createElement('style');
-    styleNode.setChild(new sky.Text(".$className { $styles }"));
-    sky.document.appendChild(styleNode);
-
-    return className;
-  }
-
-  factory Style(String styles) {
-    return _cache.putIfAbsent(styles, () {
-      return new Style._internal(nextClassName(styles));
-    });
-  }
-
-  Style._internal(this._className);
-}

examples/fn/widgets/item.dart

 library item;
 
+import '../../../framework/fn.dart';
 import 'dart:sky' as sky;
-import 'fn.dart';
 import 'widgets.dart';
 
 enum Color { RED, GREEN }

examples/fn/widgets/widgets.dart

 library widgets;
 
-import '../lib/fn.dart';
 import '../../../framework/animation/curves.dart';
 import '../../../framework/animation/fling-curve.dart';
+import '../../../framework/fn.dart';
 import '../../../framework/theme/colors.dart';
 import '../../../framework/theme/shadows.dart';
 import 'dart:collection';

examples/stocks-fn/stocksapp.dart

 library stocksapp;
 
+import '../../framework/fn.dart';
 import '../data/stocks.dart';
-import '../fn/lib/fn.dart';
 import '../fn/widgets/widgets.dart';
 import 'dart:collection';
 import 'dart:math';