Move settings-section animations into setting-section, make better

chrome/browser/resources/settings/settings_page/open_section_transition.js

+// Copyright 2016 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.
+
+cr.define('settings', function() {
+  'use strict';
+
+  /**
+   * Opens a section by hiding other sections and expanding the section's card
+   * to fill the screen vertically.
+   * @constructor
+   * @implements {settings.animation.AnimationGroup}
+   * @param {!SettingsSectionElement} section
+   * @param {!HTMLElement} container Scrolling container of sections.
+   */
+  function OpenSectionTransition(section, container) {
+    this.section = section;
+    /** @private */ this.container_ = container;
+  }
+
+  OpenSectionTransition.prototype = {
+    __proto__: settings.animation.AnimationGroup.prototype,
+
+    /** @override */
+    play: function() {
+      var finished;
+      // If we're running this transition before anything else, or coming from
+      // a different page, don't animate.
+      if (!this.section.canAnimateExpand()) {
+        finished = Promise.resolve(true);
+      } else {
+        this.animation_ = this.section.animateExpand(this.container_);
+        finished = this.animation_.finished;
+      }
+
+      return this.finished = finished.then(function() {
+        this.cleanUp_(true);
+        return true;
+      }.bind(this), function() {
+        this.cleanUp_(false);
+        return false;
+      }.bind(this));
+    },
+
+    /** @override */
+    finish: function() {
+      if (this.animation_)
+        this.animation_.finish();
+      this.animation_ = null;
+    },
+
+    /** @override */
+    cancel: function() {
+      if (this.animation_)
+        this.animation_.cancel();
+      this.animation_ = null;
+    },
+
+    /** @override */
+    finished: null,
+
+    /**
+     * @param {boolean} finished Whether the animation finished.
+     * @private
+     */
+    cleanUp_: function(finished) {
+      this.animation_ = null;
+      this.section.classList.toggle('expanded', finished);
+    },
+  };
+
+  /**
+   * Closes a section by collapsing it back into place and restoring the card.
+   * @constructor
+   * @implements {settings.animation.AnimationGroup}
+   * @param {!SettingsSectionElement} section
+   * @param {!HTMLElement} container Scrolling container of sections.
+   */
+  function CloseSectionTransition(section, container) {
+    this.section = section;
+    /** @private */ this.container_ = container;
+  }
+
+  CloseSectionTransition.prototype = {
+    __proto__: settings.animation.AnimationGroup.prototype,
+
+    /** Prepares the transitions. */
+    setUp: function() {
+      // If we navigated here directly, we don't know the original height of the
+      // section, so we skip the animation.
+      /** @private */ this.canCollapse_ = this.section.canAnimateCollapse();
+      if (this.canCollapse_)
+        this.section.setUpAnimateCollapse(this.container_);
+      this.section.classList.remove('expanded');
+    },
+
+    /** @override */
+    play: function() {
+      if (!this.canCollapse_) {
+        this.finished = Promise.resolve(true);
+      } else {
+        this.animation_ = this.section.animateCollapse(this.container_);
+        this.finished = this.animation_.finished;
+      }
+
+      this.finished = this.finished.then(function() {
+        return true;
+      }, function() {
+        this.section.classList.add('expanded');
+        return false;
+      }.bind(this));
+      return this.finished;
+    },
+
+    /** @override */
+    finish: function() {
+      if (this.animation_)
+        this.animation_.finish();
+      this.animation_ = null;
+    },
+
+    /** @override */
+    cancel: function() {
+      if (this.animation_)
+        this.animation_.cancel();
+      this.animation_ = null;
+    },
+
+    /** @override */
+    finished: null,
+  };
+
+  return {
+    CloseSectionTransition: CloseSectionTransition,
+    OpenSectionTransition: OpenSectionTransition,
+  };
+});