| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2014 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="/base/events.html"> |
| <link rel="import" href="/base/ui.html"> |
| <script> |
| 'use strict'; |
| |
| /** |
| * @fileoverview Container that decorates its children. |
| */ |
| tr.exportTo('tr.b.ui', function() { |
| /** |
| * @constructor |
| */ |
| var ContainerThatDecoratesItsChildren = tr.b.ui.define('div'); |
| |
| ContainerThatDecoratesItsChildren.prototype = { |
| __proto__: HTMLUnknownElement.prototype, |
| |
| decorate: function() { |
| this.observer_ = new WebKitMutationObserver(this.didMutate_.bind(this)); |
| this.observer_.observe(this, { childList: true }); |
| |
| // textContent is a variable on regular HTMLElements. However, we want to |
| // hook and prevent writes to it. |
| Object.defineProperty( |
| this, 'textContent', |
| { get: undefined, set: this.onSetTextContent_}); |
| }, |
| |
| appendChild: function(x) { |
| HTMLUnknownElement.prototype.appendChild.call(this, x); |
| this.didMutate_(this.observer_.takeRecords()); |
| }, |
| |
| insertBefore: function(x, y) { |
| HTMLUnknownElement.prototype.insertBefore.call(this, x, y); |
| this.didMutate_(this.observer_.takeRecords()); |
| }, |
| |
| removeChild: function(x) { |
| HTMLUnknownElement.prototype.removeChild.call(this, x); |
| this.didMutate_(this.observer_.takeRecords()); |
| }, |
| |
| replaceChild: function(x, y) { |
| HTMLUnknownElement.prototype.replaceChild.call(this, x, y); |
| this.didMutate_(this.observer_.takeRecords()); |
| }, |
| |
| onSetTextContent_: function(textContent) { |
| if (textContent != '') |
| throw new Error('textContent can only be set to \'\'.'); |
| this.clear(); |
| }, |
| |
| clear: function() { |
| while (this.lastChild) |
| HTMLUnknownElement.prototype.removeChild.call(this, this.lastChild); |
| this.didMutate_(this.observer_.takeRecords()); |
| }, |
| |
| didMutate_: function(records) { |
| this.beginDecorating_(); |
| for (var i = 0; i < records.length; i++) { |
| var addedNodes = records[i].addedNodes; |
| if (addedNodes) { |
| for (var j = 0; j < addedNodes.length; j++) |
| this.decorateChild_(addedNodes[j]); |
| } |
| var removedNodes = records[i].removedNodes; |
| if (removedNodes) { |
| for (var j = 0; j < removedNodes.length; j++) { |
| this.undecorateChild_(removedNodes[j]); |
| } |
| } |
| } |
| this.doneDecoratingForNow_(); |
| }, |
| |
| decorateChild_: function(child) { |
| throw new Error('Not implemented'); |
| }, |
| |
| undecorateChild_: function(child) { |
| throw new Error('Not implemented'); |
| }, |
| |
| beginDecorating_: function() { |
| }, |
| |
| doneDecoratingForNow_: function() { |
| } |
| }; |
| |
| return { |
| ContainerThatDecoratesItsChildren: ContainerThatDecoratesItsChildren |
| }; |
| |
| }); |
| </script> |
