MD Settings: Custom expand/collapse section animations.

chrome/browser/resources/settings/settings_page/settings_section.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-section' shows a paper material themed section with a header
  * which shows its page title.
  *
  * Example:
  *
  *    <settings-section page-title="[[pageTitle]]" section="privacy">
  *      <!-- Insert your section controls here -->
  *    </settings-section>
  *
  * @group Chrome Settings Elements
  * @element settings-section
  */
 Polymer({
   is: 'settings-section',
 
-  behaviors: [
-    Polymer.NeonAnimationRunnerBehavior,
-  ],
-
   properties: {
     /**
      * The current active route.
      */
-    currentRoute: {
-      type: Object,
-      observer: 'currentRouteChanged_',
-    },
+    currentRoute: Object,
 
     /**
      * The section is expanded to a full-page view when this property matches
      * currentRoute.section.
      *
      * The section name must match the name specified in settings_router.js.
      */
     section: {
       type: String,
     },
 
     /**
      * Title for the page header and navigation menu.
      */
     pageTitle: String,
-
-    animationConfig: {
-      value: function() {
-        return {
-          collapse: {
-            name: 'collapse-card-animation',
-            node: this,
-          },
-          expand: {
-            name: 'expand-card-animation',
-            node: this,
-          },
-        };
-      },
-    },
-  },
-
-  listeners: {
-    'expand-animation-complete': 'onExpandAnimationComplete_',
-  },
-
-  /** @private */
-  currentRouteChanged_: function(newRoute, oldRoute) {
-    var newExpanded = newRoute.section == this.section;
-    var oldExpanded = oldRoute && oldRoute.section == this.section;
-
-    var visible = newExpanded || this.currentRoute.section == '';
-
-    // If the user navigates directly to a subpage, skip all the animations.
-    if (!oldRoute) {
-      if (newExpanded) {
-        // If we navigate directly to a subpage, skip animations.
-        this.classList.add('expanded');
-      } else if (!visible) {
-        this.hidden = true;
-        this.$.card.elevation = 0;
-      }
-
-      return;
-    }
-
-    if (newExpanded && !oldExpanded) {
-      this.playAnimation('expand');
-    } else if (oldExpanded && !newExpanded) {
-      // For contraction, we defer the animation to allow
-      // settings-animated-pages to reflow the new page correctly.
-      this.async(function() {
-        this.playAnimation('collapse');
-      }.bind(this));
-    }
-
-    this.$.card.elevation = visible ? 1 : 0;
-
-    // Remove 'hidden' class immediately, but defer adding it if we are invisble
-    // until the animation is complete.
-    if (visible)
-      this.hidden = false;
-  },
-
-  /** @private */
-  onExpandAnimationComplete_: function() {
-    this.hidden = this.currentRoute.section != '' &&
-                  this.currentRoute.section != this.section;
   },
 });
-
-Polymer({
-  is: 'expand-card-animation',
-
-  behaviors: [
-    Polymer.NeonAnimationBehavior
-  ],
-
-  configure: function(config) {
-    var section = config.node;
-    var card = section.$.card;
-    var containerRect = section.offsetParent.getBoundingClientRect();
-    var cardRect = card.getBoundingClientRect();
-
-    // Set placeholder height so the page does not reflow during animation.
-    // TODO(tommycli): For URLs that directly load subpages, this does not work.
-    var placeholder = section.$.placeholder;
-    placeholder.style.top = card.offsetTop + 'px';
-    placeholder.style.height = card.offsetHeight + 'px';
-
-    section.classList.add('neon-animating');
-
-    this._effect = new KeyframeEffect(card, [
-      {'top': cardRect.top + 'px', 'height': cardRect.height + 'px'},
-      {'top': containerRect.top + 'px', 'height': containerRect.height + 'px'},
-    ], this.timingFromConfig(config));
-    return this._effect;
-  },
-
-  complete: function(config) {
-    var section = config.node;
-    section.classList.remove('neon-animating');
-    section.classList.add('expanded');
-
-    // This event fires on itself as well, but that is benign.
-    var sections = section.parentNode.querySelectorAll('settings-section');
-    for (var i = 0; i < sections.length; ++i) {
-      sections[i].fire('expand-animation-complete');
-    }
-  }
-});
-
-Polymer({
-  is: 'collapse-card-animation',
-
-  behaviors: [
-    Polymer.NeonAnimationBehavior
-  ],
-
-  configure: function(config) {
-    var section = config.node;
-    var oldRect = section.offsetParent.getBoundingClientRect();
-
-    section.classList.remove('expanded');
-
-    var card = section.$.card;
-    var placeholder = section.$.placeholder;
-    placeholder.style.top = card.offsetTop + 'px';
-    placeholder.style.height = card.offsetHeight + 'px';
-
-    var newRect = card.getBoundingClientRect();
-
-    section.classList.add('neon-animating');
-
-    this._effect = new KeyframeEffect(card, [
-      {'top': oldRect.top + 'px', 'height': oldRect.height + 'px'},
-      {'top': newRect.top + 'px', 'height': newRect.height + 'px'},
-    ], this.timingFromConfig(config));
-    return this._effect;
-  },
-
-  complete: function(config) {
-    config.node.classList.remove('neon-animating');
-  }
-});