| // Copyright (c) 2014, 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. |
| |
| // Teaches dart2js about the wrapping that is done by the Shadow DOM polyfill. |
| (function() { |
| var ShadowDOMPolyfill = window.ShadowDOMPolyfill; |
| if (!ShadowDOMPolyfill) return; |
| |
| // TODO(sigmund): remove the userAgent check once 1.6 rolls as stable. |
| // See: dartbug.com/18463 |
| if (navigator.dartEnabled || (navigator.userAgent.indexOf('(Dart)') !== -1)) { |
| console.error("ShadowDOMPolyfill polyfill was loaded in Dartium. This " + |
| "will not work. This indicates that Dartium's Chrome version is " + |
| "not compatible with this version of web_components."); |
| } |
| |
| var needsConstructorFix = window.constructor === window.Window; |
| |
| // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?) |
| |
| // dartNativeDispatchHooksTransformer is described on initHooks() in |
| // sdk/lib/_internal/lib/native_helper.dart. |
| if (typeof window.dartNativeDispatchHooksTransformer == 'undefined') |
| window.dartNativeDispatchHooksTransformer = []; |
| |
| window.dartNativeDispatchHooksTransformer.push(function(hooks) { |
| var NodeList = ShadowDOMPolyfill.wrappers.NodeList; |
| var ShadowRoot = ShadowDOMPolyfill.wrappers.ShadowRoot; |
| var unwrapIfNeeded = ShadowDOMPolyfill.unwrapIfNeeded; |
| var originalGetTag = hooks.getTag; |
| hooks.getTag = function getTag(obj) { |
| // TODO(jmesserly): do we still need these? |
| if (obj instanceof NodeList) return 'NodeList'; |
| if (obj instanceof ShadowRoot) return 'ShadowRoot'; |
| if (MutationRecord && (obj instanceof MutationRecord)) |
| return 'MutationRecord'; |
| if (MutationObserver && (obj instanceof MutationObserver)) |
| return 'MutationObserver'; |
| |
| // TODO(jmesserly): this prevents incorrect interaction between ShadowDOM |
| // and dart:html's <template> polyfill. Essentially, ShadowDOM is |
| // polyfilling native template, but our Dart polyfill fails to detect this |
| // because the unwrapped node is an HTMLUnknownElement, leading it to |
| // think the node has no content. |
| if (obj instanceof HTMLTemplateElement) return 'HTMLTemplateElement'; |
| |
| var unwrapped = unwrapIfNeeded(obj); |
| if (unwrapped && (needsConstructorFix || obj !== unwrapped)) { |
| // Fix up class names for Firefox, or if using the minified polyfill. |
| // dart2js prefers .constructor.name, but there are all kinds of cases |
| // where this will give the wrong answer. |
| var ctor = obj.constructor |
| if (ctor === unwrapped.constructor) { |
| var name = ctor._ShadowDOMPolyfill$cacheTag_; |
| if (!name) { |
| name = originalGetTag(unwrapped); |
| ctor._ShadowDOMPolyfill$cacheTag_ = name; |
| } |
| return name; |
| } |
| |
| obj = unwrapped; |
| } |
| return originalGetTag(obj); |
| } |
| }); |
| })(); |