Add cr-settings-radio-group wrapper

chrome/browser/resources/settings/radio_group/radio_group.js

+// Copyright 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.
+
+/**
+ * @fileoverview
+ * `cr-radio-group` wraps a radio-group and set of radio-buttons that control
+ *  a supplied preference.
+ *
+ * Example:
+ *      <cr-settings-radio-group pref="{{prefs.settings.foo}}"
+ *          label="Foo Options." buttons="{{fooOptionsList}}">
+ *      </cr-settings-radio-group>
+ *
+ * @element cr-settings-radio-group
+ */
+Polymer({
+  is: 'cr-settings-radio-group',
+
+  properties: {
+    /**
+     * The preference object to control.
+     * @type {chrome.settingsPrivate.PrefObject|undefined}
+     */
+    pref: {
+      type: Object,
+      notify: true,
+      observer: 'prefChanged_'
+    },
+
+    /**
+     * IronSelectableBehavior selected attribute
+     */
+    selected: {
+      type: String,
+      observer: 'selectedChanged_'
+    },
+  },
+
+  /** @private */
+  prefChanged_: function() {
+    if (!this.pref)
+      return;
+    if (this.pref.type == chrome.settingsPrivate.PrefType.NUMBER ||
+        this.pref.type == chrome.settingsPrivate.PrefType.BOOLEAN) {
+      this.selected = this.pref.value.toString();
+    } else {
+      assert(this.pref.type != chrome.settingsPrivate.PrefType.LIST);
+      this.selected = /** @type {string} */(this.pref.value);
+    }
+  },
+
+  /** @private */
+  selectedChanged_: function() {
+    if (!this.pref)
+      return;
+    if (this.pref.type == chrome.settingsPrivate.PrefType.NUMBER) {
+      var n = parseInt(this.selected, 10);
+      if (isNaN(n)) {
+        console.error('Bad selected name for numerical pref: ' + this.selected);

[Dan Beam, 2015/09/16 22:29:37]

why not just assert(!isNan(n))?

+        return;
+      }
+      this.set('pref.value', n);
+    } else if (this.pref.type == chrome.settingsPrivate.PrefType.BOOLEAN) {
+      this.set('pref.value', this.selected == 'true');
+    } else {
+      assert(this.pref.type != chrome.settingsPrivate.PrefType.LIST);
+      this.set('pref.value', this.selected);
+    }
+  },
+});