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packages/template_binding/test/custom_element_bindings_test.dart

Index: packages/template_binding/test/custom_element_bindings_test.dart
diff --git a/packages/template_binding/test/custom_element_bindings_test.dart b/packages/template_binding/test/custom_element_bindings_test.dart
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+// 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.
+
+library template_binding.test.custom_element_bindings_test;
+
+import 'dart:async';
+import 'dart:html';
+import 'dart:collection' show MapView;
+import 'package:template_binding/template_binding.dart';
+import 'package:observe/observe.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:web_components/polyfill.dart';
+import 'utils.dart';
+import 'package:observe/mirrors_used.dart'; // make test smaller
+import 'package:smoke/mirrors.dart' as smoke;
+
+Future _registered;
+
+main() => dirtyCheckZone().run(() {
+  smoke.useMirrors();
+  useHtmlConfiguration();
+
+  _registered = customElementsReady.then((_) {
+    document.registerElement('my-custom-element', MyCustomElement);
+  });
+
+  group('Custom Element Bindings', customElementBindingsTest);
+});
+
+customElementBindingsTest() {
+  setUp(() {
+    document.body.append(testDiv = new DivElement());
+    return _registered;
+  });
+
+  tearDown(() {
+    testDiv.remove();
+    testDiv = null;
+  });
+
+  test('override bind/bindFinished', () {
+    var element = new MyCustomElement();
+    var model = toObservable({'a': new Point(123, 444), 'b': new Monster(100)});
+
+    var pointBinding = nodeBind(element)
+        .bind('my-point', new PathObserver(model, 'a'));
+
+    var scaryBinding = nodeBind(element)
+        .bind('scary-monster', new PathObserver(model, 'b'));
+
+    expect(element.attributes, isNot(contains('my-point')));
+    expect(element.attributes, isNot(contains('scary-monster')));
+
+    expect(element.myPoint, model['a']);
+    expect(element.scaryMonster, model['b']);
+
+    model['a'] = null;
+    return new Future(() {
+      expect(element.myPoint, null);
+      expect(element.bindFinishedCalled, 0);
+      pointBinding.close();
+
+      model['a'] = new Point(1, 2);
+      model['b'] = new Monster(200);
+    }).then(endOfMicrotask).then((_) {
+      expect(element.scaryMonster, model['b']);
+      expect(element.myPoint, null, reason: 'a was unbound');
+
+      scaryBinding.close();
+      model['b'] = null;
+    }).then(endOfMicrotask).then((_) {
+      expect(element.scaryMonster.health, 200);
+      expect(element.bindFinishedCalled, 0);
+    });
+  });
+
+  test('template bind uses overridden custom element bind', () {
+
+    var model = toObservable({'a': new Point(123, 444), 'b': new Monster(100)});
+    var div = createTestHtml('<template bind>'
+          '<my-custom-element my-point="{{a}}" scary-monster="{{b}}">'
+          '</my-custom-element>'
+        '</template>');
+
+    templateBind(div.query('template')).model = model;
+    var element;
+    return new Future(() {
+      element = div.nodes[1];
+
+      expect(element is MyCustomElement, true,
+          reason: '$element should be a MyCustomElement');
+
+      expect(element.myPoint, model['a']);
+      expect(element.scaryMonster, model['b']);
+
+      expect(element.attributes, isNot(contains('my-point')));
+      expect(element.attributes, isNot(contains('scary-monster')));
+
+      expect(element.bindFinishedCalled, 1);
+
+      model['a'] = null;
+    }).then(endOfMicrotask).then((_) {
+      expect(element.myPoint, null);
+      expect(element.bindFinishedCalled, 1);
+
+
+      templateBind(div.query('template')).model = null;
+    }).then(endOfMicrotask).then((_) {
+      // Note: the detached element
+      expect(element.parentNode is DocumentFragment, true,
+          reason: 'removed element is added back to its document fragment');
+      expect(element.parentNode.parentNode, null,
+          reason: 'document fragment is detached');
+      expect(element.bindFinishedCalled, 1);
+
+      model['a'] = new Point(1, 2);
+      model['b'] = new Monster(200);
+    }).then(endOfMicrotask).then((_) {
+      expect(element.myPoint, null, reason: 'model was unbound');
+      expect(element.scaryMonster.health, 100, reason: 'model was unbound');
+      expect(element.bindFinishedCalled, 1);
+    });
+  });
+
+}
+
+class Monster {
+  int health;
+  Monster(this.health);
+}
+
+/** Demonstrates a custom element overriding bind/bindFinished. */
+class MyCustomElement extends HtmlElement implements NodeBindExtension {
+  Point myPoint;
+  Monster scaryMonster;
+  int bindFinishedCalled = 0;
+
+  factory MyCustomElement() => new Element.tag('my-custom-element');
+
+  MyCustomElement.created() : super.created();
+
+  Bindable bind(String name, value, {oneTime: false}) {
+    switch (name) {
+      case 'my-point':
+      case 'scary-monster':
+        attributes.remove(name);
+        if (oneTime) {
+          _setProperty(name, value);
+          return null;
+        }
+        _setProperty(name, value.open((x) => _setProperty(name, x)));
+
+        if (!enableBindingsReflection) return value;
+        if (bindings == null) bindings = {};
+        var old = bindings[name];
+        if (old != null) old.close();
+        return bindings[name] = value;
+    }
+    return nodeBindFallback(this).bind(name, value, oneTime: oneTime);
+  }
+
+  void bindFinished() {
+    bindFinishedCalled++;
+  }
+
+  get bindings => nodeBindFallback(this).bindings;
+  set bindings(x) => nodeBindFallback(this).bindings = x;
+  get templateInstance => nodeBindFallback(this).templateInstance;
+
+  void _setProperty(String property, newValue) {
+    if (property == 'my-point') myPoint = newValue;
+    if (property == 'scary-monster') scaryMonster = newValue;
+  }
+}
+