blob: 04738d5c2949b124d5bfb45812d134d447b5d6d9 [file] [log] [blame]
// Copyright (c) 2015, 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 web_components.html_import_annotation;
import 'dart:async';
import 'dart:html';
import 'package:initialize/initialize.dart';
import 'src/normalize_path.dart';
/// Annotation for a dart library which injects an html import into the
/// current html document. The imported file must not contain any dart script
/// tags, as they cannot be dynamically loaded.
class HtmlImport implements Initializer<LibraryIdentifier> {
final String filePath;
const HtmlImport(this.filePath);
Future initialize(LibraryIdentifier library) {
var element = new LinkElement()
..rel = 'import'
..href = normalizeHtmlImportPath(filePath, library.package, library.path);
var completer = new Completer();
var listeners = [
element.on['load'].listen((_) => completer.complete()),
element.on['error'].listen((_) {
print('Error loading html import from path `$filePath`');
return completer.future.then((_) {
listeners.forEach((listener) => listener.cancel());