Move client/{base, observable, layout, touch, util, view} to samples/ui_lib .

client/view/CompositeView.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/**
- * A View that is composed of child views.
- */
-class CompositeView extends View {
-
-  List<View> childViews;
-
-  // TODO(rnystrom): Allowing this to be public is gross. CompositeView should
-  // encapsulate its markup and provide accessors to do the limited amount of
-  // things that external users need to access this for.
-  Element container;
-
-  Scroller scroller;
-  Scrollbar _scrollbar;
-
-  final String _cssName;
-  final bool _scrollable;
-  final bool _vertical;
-  final bool _nestedContainer;
-  final bool _showScrollbar;
-
-  CompositeView(String this._cssName, [nestedContainer = false,
-                scrollable = false, vertical = false,
-                showScrollbar = false])
-  : super(),
-    _nestedContainer = nestedContainer,
-    _scrollable = scrollable,
-    _vertical = vertical,
-    _showScrollbar = showScrollbar,
-    childViews = new List<View>() {
-  }
-
-  Element render() {
-    Element node = new Element.html('<div class="$_cssName"></div>');
-
-    if (_nestedContainer) {
-       container = new Element.html('<div class="scroll-container"></div>');
-       node.nodes.add(container);
-     } else {
-       container = node;
-     }
-
-    if (_scrollable) {
-      scroller = new Scroller(container,
-                              _vertical /* verticalScrollEnabled */,
-                              !_vertical /* horizontalScrollEnabled */,
-                              true /* momementumEnabled */);
-      if (_showScrollbar) {
-        _scrollbar = new Scrollbar(scroller);
-      }
-    }
-
-    for (View childView in childViews) {
-      container.nodes.add(childView.node);
-    }
-
-    return node;
-  }
-
-  void afterRender(Element node) {
-    if (_scrollbar !== null) {
-      _scrollbar.initialize();
-    }
-  }
-
-  View addChild(View view) {
-    childViews.add(view);
-    // TODO(rnystrom): Container shouldn't be null. Remove this check.
-    if (container !== null) {
-      container.nodes.add(view.node);
-    }
-    childViewAdded(view);
-    return view;
-  }
-
-  void removeChild(View view) {
-    childViews = childViews.filter(bool _(e) { return view != e; });
-    // TODO(rnystrom): Container shouldn't be null. Remove this check.
-    if (container !== null) {
-      view.node.remove();
-    }
-  }
-}