Disable expansion of VirtualTree and VirtualCollection items

runtime/observatory/lib/src/elements/context_ref.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/curly_block.dart';
 import 'package:observatory/src/elements/helpers/any_ref.dart';
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/helpers/uris.dart';
 
 class ContextRefElement extends HtmlElement implements Renderable {
   static const tag = const Tag<ContextRefElement>('context-ref',
       dependencies: const [CurlyBlockElement.tag]);
 
   RenderingScheduler<ContextRefElement> _r;
 
   Stream<RenderedEvent<ContextRefElement>> get onRendered => _r.onRendered;
 
   M.IsolateRef _isolate;
   M.ContextRef _context;
   M.ObjectRepository _objects;
   M.Context _loadedContext;
+  bool _expandable;
   bool _expanded = false;
 
   M.IsolateRef get isolate => _isolate;
   M.ContextRef get context => _context;
 
   factory ContextRefElement(
       M.IsolateRef isolate, M.ContextRef context, M.ObjectRepository objects,
-      {RenderingQueue queue}) {
+      {RenderingQueue queue, bool expandable: true}) {
     assert(isolate != null);
     assert(context != null);
     assert(objects != null);
     ContextRefElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._isolate = isolate;
     e._context = context;
     e._objects = objects;
+    e._expandable = expandable;
     return e;
   }
 
   ContextRefElement.created() : super.created();
 
   @override
   void attached() {
     super.attached();
     _r.enable();
   }
 
   @override
   void detached() {
     super.detached();
     _r.disable(notify: true);
     children = [];
   }
 
   Future _refresh() async {
     _loadedContext = await _objects.get(_isolate, _context.id);
     _r.dirty();
   }
 
   void render() {
-    children = [
+    var children = [
       new AnchorElement(href: Uris.inspect(_isolate, object: _context))
         ..children = [
           new SpanElement()
             ..classes = ['emphasize']
             ..text = 'Context',
           new SpanElement()..text = ' (${_context.length})',
         ],
-      new SpanElement()..text = ' ',
-      new CurlyBlockElement(expanded: _expanded, queue: _r.queue)
-        ..content = [
-          new DivElement()
-            ..classes = ['indent']
-            ..children = _createValue()
-        ]
-        ..onToggle.listen((e) async {
-          _expanded = e.control.expanded;
-          if (_expanded) {
-            e.control.disabled = true;
-            await _refresh();
-            e.control.disabled = false;
-          }
-        })
     ];
+    if (_expandable) {
+      children.addAll([
+        new SpanElement()..text = ' ',
+        new CurlyBlockElement(expanded: _expanded, queue: _r.queue)
+          ..content = [
+            new DivElement()
+              ..classes = ['indent']
+              ..children = _createValue()
+          ]
+          ..onToggle.listen((e) async {
+            _expanded = e.control.expanded;
+            if (_expanded) {
+              e.control.disabled = true;
+              await _refresh();
+              e.control.disabled = false;
+            }
+          })
+      ]);
+    }
+    this.children = children;
   }
 
   List<Element> _createValue() {
     if (_loadedContext == null) {
       return [new SpanElement()..text = 'Loading...'];
     }
     var members = new List<Element>();
     if (_loadedContext.parentContext != null) {
       members.add(new DivElement()
         ..classes = ['memberItem']
@@ skipping 28 matching lines @@
           ]);
       }
     }
     return [
       new DivElement()
         ..classes = ['memberList']
         ..children = members
     ];
   }
 }