'extends Element'

tools/dom/src/dart2js_CustomElementSupport.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.
+
+part of html;

[blois, 2013/08/09 16:06:23]

should be dart.dom.html

[sra1, 2013/08/12 23:31:26]

Done.

+
+
+/*
+    var proto = Object.create(HTMLElement.prototype, {
+        createdCallback: {
+          get: function() {
+            window.console.log('here');
+          }
+        }
+    });
+    document.register('x-foo', {
+        prototype: proto
+      });
+
+    var e = document.createElement('x-foo');
+
+ */
+
+callOnCreated(receiver) {

[blois, 2013/08/09 16:06:23]

Can these either be private or not top-level?

[sra1, 2013/08/12 23:31:26]

Done.

+  return receiver.onCreated();
+}
+
+makeCreatedCallbackMethod() {
+  return JS('',
+      '''((function(invokeCallback) {

[blois, 2013/08/09 16:06:23]

Is this outer function closure needed?

[sra1, 2013/08/12 23:31:26]

Yes, see
https://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/sdk/...

+             return function() {
+               return invokeCallback(this);
+             };
+          })(#))''',
+      convertDartClosureToJS(callOnCreated, 1));
+}
+
+void registerCustomElement(context, document, String tag, Type type) {
+  var interceptorClass = findInterceptorConstructorForType(type);
+  if (interceptorClass == null) {
+    throw new ArgumentError(type);
+  }
+
+  String baseClassName = findDispatchTagForInterceptorClass(interceptorClass);
+  if (baseClassName == null) {
+    throw new ArgumentError(type);
+  }
+  if (baseClassName == 'Element') baseClassName = 'HTMLElement';
+
+  var baseConstructor = JS('=Object', '#[#]', context, baseClassName);
+  if (JS('bool', "typeof(#) != 'function'", baseConstructor)) {
+    throw new ArgumentError(type);
+  }
+
+  var properties = JS('=Object', '{}');
+
+  var jsCreatedCallback = makeCreatedCallbackMethod();
+
+  JS('void', '#.createdCallback = #', properties,
+      JS('=Object', '{value: #}', jsCreatedCallback));
+
+  var baseProto = JS('=Object', '#.prototype', baseConstructor);
+  var proto = JS('=Object', 'Object.create(#, #)', baseProto, properties);
+
+  var interceptor = JS('=Object', '#.prototype', interceptorClass);
+
+  setNativeSubclassDispatchRecord(proto, interceptor);
+
+
+  JS('void', '#.register(#, #)',
+      document, tag, JS('', '{prototype: #}', proto));
+
+  print('Registered $type');

[blois, 2013/08/09 16:06:23]

Debugging

[sra1, 2013/08/12 23:31:26]

Done.

+}