Create HostList class to facilitate future work.

remoting/webapp/me2mom/host_list.js

+// Copyright (c) 2011 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.
+
+/**
+ * @fileoverview
+ * Class representing the host-list portion of the home screen UI.
+ */
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+/**
+ * @constructor
+ */
+remoting.Host = function() {
+  /** @type {string} */
+  this.hostName = '';
+  /** @type {string} */
+  this.hostId = '';
+  /** @type {string} */
+  this.status = '';
+  /** @type {string} */
+  this.jabberId = '';
+  /** @type {string} */
+  this.publicKey = '';
+}
+
+
+/**
+ * @constructor
+ * @param {Element} table The HTML <table> to contain host-list.
+ * @param {Element} errorDiv The HTML <div> to display error messages.
+ */
+remoting.HostList = function(table, errorDiv) {
+  this.table = table;
+  this.errorDiv = errorDiv;
+  /** @type {Array.<remoting.Host>} */
+  this.hosts = null;
+}
+
+/**
+ * Refresh the host list with up-to-date details.
+ * @param {Array.<remoting.Host>} hosts The new host list.
+ * @return {void} Nothing.
+ */
+remoting.HostList.prototype.update = function(hosts) {
+  this.table.innerHTML = '';
+  this.showError(null);
+  this.hosts = hosts;
+
+  for (var i = 0; i < hosts.length; ++i) {
+    var host = hosts[i];
+    if (!host.hostName || !host.hostId || !host.status || !host.jabberId ||
+        !host.publicKey)
+      continue;
+
+    var hostEntry = document.createElement('tr');
+    addClass(hostEntry, 'host-list-row');
+
+    var hostIcon = document.createElement('td');
+    var hostIconImage = document.createElement('img');
+    hostIconImage.src = 'icon_host.png';
+    hostIcon.className = 'host-list-row-start';
+    hostIcon.appendChild(hostIconImage);
+    hostEntry.appendChild(hostIcon);
+
+    var hostName = document.createElement('td');
+    hostName.setAttribute('class', 'mode-select-label');
+    hostName.appendChild(document.createTextNode(host.hostName));
+    hostEntry.appendChild(hostName);
+
+    var hostStatus = document.createElement('td');
+    if (host.status == 'ONLINE') {
+      var connectButton = document.createElement('button');
+      connectButton.setAttribute('class', 'mode-select-button');
+      connectButton.setAttribute('type', 'button');
+      connectButton.setAttribute('onclick',
+                                 'remoting.connectHost("'+host.hostId+'")');
+      connectButton.innerHTML =
+          chrome.i18n.getMessage(/*i18n-content*/'CONNECT_BUTTON');
+      hostStatus.appendChild(connectButton);
+    } else {
+      addClass(hostEntry, 'host-offline');
+      hostStatus.innerHTML = chrome.i18n.getMessage(/*i18n-content*/'OFFLINE');
+    }
+    hostStatus.className = 'host-list-row-end';
+    hostEntry.appendChild(hostStatus);
+
+    this.table.appendChild(hostEntry);
+  }
+
+  this.showOrHide_(this.hosts.length != 0);
+}
+
+/**
+ * Display a localized error message.
+ * @param {remoting.Error?} errorTag The error to display, or NULL to clear any
+ *     previous error.
+ * @return {void} Nothing.
+ */
+remoting.HostList.prototype.showError = function(errorTag) {
+  this.table.innerHTML = '';
+  if (errorTag) {
+    l10n.localizeElementFromTag(this.errorDiv,
+                                /** @type {string} */ (errorTag));
+    this.showOrHide_(true);
+  } else {
+    this.errorDiv.innerText = '';
+  }
+}
+
+/**
+ * Show or hide the host-list UI.
+ * @param {boolean} show True to show the UI, or false to hide it.
+ * @return {void} Nothing.
+ * @private
+ */
+remoting.HostList.prototype.showOrHide_ = function(show) {
+  var parent = /** @type {Element} */ (this.table.parentNode);
+  parent.hidden = !show;
+  if (show) {
+    parent.style.height = parent.scrollHeight + 'px';
+    removeClass(parent, remoting.HostList.COLLAPSED_);
+  } else {
+    addClass(parent, remoting.HostList.COLLAPSED_);
+  }
+}
+
+/**
+ * Class name for the host list when it is collapsed.
+ * @private
+ */
+remoting.HostList.COLLAPSED_ = 'collapsed';
+
+/** @type {remoting.HostList} */
+remoting.hostList = null;