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| 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 library web_components.html_import_annotation; |
| 5 |
| 6 import 'dart:async'; |
| 7 import 'dart:html'; |
| 8 import 'package:initialize/initialize.dart'; |
| 9 import 'src/normalize_path.dart'; |
| 10 |
| 11 /// Annotation for a dart library which injects an html import into the |
| 12 /// current html document. The imported file must not contain any dart script |
| 13 /// tags, as they cannot be dynamically loaded. |
| 14 class HtmlImport implements Initializer<LibraryIdentifier> { |
| 15 final String filePath; |
| 16 |
| 17 const HtmlImport(this.filePath); |
| 18 |
| 19 Future initialize(LibraryIdentifier library) { |
| 20 var element = new LinkElement() |
| 21 ..rel = 'import' |
| 22 ..href = normalizeHtmlImportPath(filePath, library.package, library.path); |
| 23 document.head.append(element); |
| 24 var completer = new Completer(); |
| 25 var listeners = [ |
| 26 element.on['load'].listen((_) => completer.complete()), |
| 27 element.on['error'].listen((_) { |
| 28 print('Error loading html import from path `$filePath`'); |
| 29 completer.complete(); |
| 30 }), |
| 31 ]; |
| 32 return completer.future.then((_) { |
| 33 listeners.forEach((listener) => listener.cancel()); |
| 34 }); |
| 35 } |
| 36 } |
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