| // Copyright (c) 2017, 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. |
| |
| @JS() |
| library js_extend_class_test; |
| |
| import 'dart:html'; |
| |
| import 'package:js/js.dart'; |
| import 'package:js/js_util.dart' as js_util; |
| import 'package:expect/minitest.dart'; |
| |
| @JS('Date') |
| class JSDate { |
| external get jsField; |
| external get jsMethod; |
| } |
| |
| @JS('Date.prototype.jsField') |
| external set datePrototypeJSField(v); |
| |
| @JS('Date.prototype.jsMethod') |
| external set datePrototypeJSMethod(v); |
| |
| // Extending a JS class with a Dart class is only supported by DDC for now. |
| // We extend the Date class instead of a user defined JS class to avoid the |
| // hassle of ensuring the JS class exists before we use it. |
| class DartJsDate extends JSDate { |
| get dartField => 100; |
| int dartMethod(x) { |
| return x * 2; |
| } |
| } |
| |
| main() { |
| // Monkey-patch the JS Date class. |
| datePrototypeJSField = 42; |
| datePrototypeJSMethod = allowInterop((x) => x * 10); |
| |
| group('extend js class', () { |
| test('js class members', () { |
| var bar = new DartJsDate(); |
| expect(bar.jsField, equals(42)); |
| expect(bar.jsMethod(5), equals(50)); |
| |
| expect(bar.dartField, equals(100)); |
| expect(bar.dartMethod(4), equals(8)); |
| }); |
| |
| test('dart subclass members', () { |
| var bar = new DartJsDate(); |
| expect(bar.dartField, equals(100)); |
| expect(bar.dartMethod(4), equals(8)); |
| }); |
| }); |
| } |