[MD settings] redesign of side nav

chrome/browser/resources/settings/settings_main/settings_main.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
  * 'settings-main' displays the selected settings page.
- *
- * Example:
- *
- *     <settings-main pages="[[pages]]" selected-page-id="{{selectedId}}">
- *     </settings-main>
- *
- * See settings-drawer for example of use in 'paper-drawer-panel'.
  */
 Polymer({
   is: 'settings-main',
 
   properties: {
+    /** @private */
+    isAdvancedMenuOpen_: {
+      type: Boolean,
+      value: false,
+    },
+
     /**
      * Preferences state.
-     *
-     * @type {?CrSettingsPrefsElement}
      */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
      * The current active route.
+     * @type {!SettingsRoute}
      */
     currentRoute: {
       type: Object,
       notify: true,
       observer: 'currentRouteChanged_',
     },
 
     /** @private */
-    showAdvancedPage_: Boolean,
+    showAdvancedPage_: {
+      type: Boolean,
+      value: false,
+    },
 
     /** @private */
-    showBasicPage_: Boolean,
+    showAdvancedToggle_: {
+      type: Boolean,
+      value: true,
+    },
 
     /** @private */
-    showAboutPage_: Boolean,
+    showBasicPage_: {
+      type: Boolean,
+      value: true,
+    },
+
+    /** @private */
+    showAboutPage_: {
+      type: Boolean,
+      value: false,
+    },
+  },
+
+  attached: function() {
+    document.addEventListener('toggle-advanced-page', function(e) {
+      this.showAdvancedPage_ = e.detail;
+      this.isAdvancedMenuOpen_ = e.detail;
+    }.bind(this));
   },
 
   /**
    * @param {!SettingsRoute} newRoute
    * @private
    */
   currentRouteChanged_: function(newRoute) {
+    var isSubpage = !!newRoute.subpage.length;
+
     this.showAboutPage_ = newRoute.page == 'about';
-    this.showAdvancedPage_ = newRoute.page == 'advanced';
-    this.showBasicPage_ = newRoute.page == 'basic';
+
+    this.showAdvancedToggle_ = !this.showAboutPage_ && !isSubpage;
+
+    this.showBasicPage_ = this.showAdvancedToggle_ || newRoute.page == 'basic';
+
+    this.showAdvancedPage_ =
+        (this.isAdvancedMenuOpen_ && this.showAdvancedToggle_) ||
+        newRoute.page == 'advanced';
+
+    this.$.pageContainer.style.height = isSubpage ? '100%' : '';

[michaelpg, 2016/06/09 18:00:13]

this resets the scrollTop of this.$.pageContainer to 0

+  },
+
+  /** @private */
+  toggleAdvancedPage_: function() {
+    this.fire('toggle-advanced-page', !this.isAdvancedMenuOpen_);
   },
 });