| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2015 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| |
| <link rel="import" href="/tracing/base/extension_registry.html"> |
| <link rel="import" href="/tracing/base/guid.html"> |
| |
| <script> |
| 'use strict'; |
| |
| tr.exportTo('tr.model', function() { |
| /** |
| * Annotation is a base class that represents all annotation objects that |
| * can be drawn on the timeline. |
| * |
| * @constructor |
| */ |
| function Annotation() { |
| this.guid_ = tr.b.GUID.allocateSimple(); |
| this.view_ = undefined; |
| }; |
| |
| Annotation.fromDictIfPossible = function(args) { |
| if (args.typeName === undefined) |
| throw new Error('Missing typeName argument'); |
| |
| var typeInfo = Annotation.findTypeInfoMatching(function(typeInfo) { |
| return typeInfo.metadata.typeName === args.typeName; |
| }); |
| |
| if (typeInfo === undefined) |
| return undefined; |
| |
| return typeInfo.constructor.fromDict(args); |
| }; |
| |
| Annotation.fromDict = function() { |
| throw new Error('Not implemented'); |
| }; |
| |
| Annotation.prototype = { |
| get guid() { |
| return this.guid_; |
| }, |
| |
| // Invoked by trace model when this annotation is removed. |
| onRemove: function() { |
| }, |
| |
| toDict: function() { |
| throw new Error('Not implemented'); |
| }, |
| |
| getOrCreateView: function(viewport) { |
| if (!this.view_) |
| this.view_ = this.createView_(viewport); |
| return this.view_; |
| }, |
| |
| createView_: function() { |
| throw new Error('Not implemented'); |
| } |
| }; |
| |
| var options = new tr.b.ExtensionRegistryOptions(tr.b. BASIC_REGISTRY_MODE); |
| tr.b.decorateExtensionRegistry(Annotation, options); |
| |
| Annotation.addEventListener('will-register', function(e) { |
| if (!e.typeInfo.constructor.hasOwnProperty('fromDict')) |
| throw new Error('Must have fromDict method'); |
| |
| if (!e.typeInfo.metadata.typeName) |
| throw new Error('Registered Annotations must provide typeName'); |
| }); |
| |
| return { |
| Annotation: Annotation |
| }; |
| }); |
| </script> |
