Extract policy indicator behavior

ui/webui/resources/cr_elements/v1_0/policy/cr_policy_pref_indicator.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 Polymer element for indicating policies that apply to an
+ * element controlling a settings preference.
+ *
+ * @element cr-policy-pref-indicator
+ */
+Polymer({
+  is: 'cr-policy-pref-indicator',
+
+  behaviors: [CrPolicyIndicatorBehavior, CrPolicyPrefBehavior],
+
+  properties: {
+    /**
+     * Optional preference object associated with the indicator. Initialized to
+     * null so that computed functions will get called if this is never set.
+     * @type {?chrome.settingsPrivate.PrefObject}
+     */
+    pref: {type: Object, value: null},
+
+    /**
+     * Optional email of the user controlling the setting when the setting does
+     * not correspond to a pref (Chrome OS only). Only used when pref is null.
+     * Initialized to '' so that computed functions will get called if this is
+     * never set.
+     */
+    controllingUser: {type: String, value: ''},

[michaelpg, 2015/10/07 18:18:35]

TODO (for me or you): extract this to a separate indicator when we add more
indicators using user instead of pref (ie, get rid of my hax)

[stevenjb, 2015/10/07 18:33:38]

Done.

+
+    /**
+     * Which indicator type to show (or NONE).
+     * @type {CrPolicyIndicatorType}
+     */
+    indicatorType: {type: String, value: CrPolicyIndicatorType.NONE},
+  },
+
+  observers: ['prefPolicyChanged_(pref.policySource, pref.policyEnforcement)'],
+
+  /**
+   * Polymer observer for pref.
+   * @param {chrome.settingsPrivate.PolicySource} source
+   * @param {chrome.settingsPrivate.PolicyEnforcement} enforcement
+   * @private
+   */
+  prefPolicyChanged_: function(source, enforcement) {
+    this.indicatorType = this.getIndicatorType(source, enforcement);
+  },
+
+  /**
+   * @param {CrPolicyIndicatorType} type
+   * @param {?chrome.settingsPrivate.PrefObject} pref
+   * @return {string} The tooltip text for |type|.
+   * @private
+   */
+  getTooltip_: function(type, pref, controllingUser) {
+    if (type == CrPolicyIndicatorType.RECOMMENDED) {
+      if (pref && pref.value == pref.recommendedValue)
+        return this.i18n('controlledSettingRecommendedMatches');
+      return this.i18n('controlledSettingRecommendedDiffers');
+    }
+    var name = pref ? pref.policySourceName : controllingUser;
+    return this.getTooltipText(type, name);
+  }
+});