Polymer elements added to third_party/polymer.

third_party/polymer/components/core-menu/core-submenu.html

+<!--
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE
+The complete set of authors may be found at http://polymer.github.io/AUTHORS
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS
+-->
+
+<!--
+Use to create nested menus inside of `core-menu` elements.
+
+    <core-menu selected="0">
+    
+      <core-submenu icon="settings" label="Topics">
+        <core-item label="Topic 1"></core-item>
+        <core-item label="Topic 2"></core-item>
+      </core-submenu>
+      
+      <core-submenu icon="settings" label="Favorites">
+        <core-item label="Favorite 1"></core-item>
+        <core-item label="Favorite 2"></core-item>
+        <core-item label="Favorite 3"></core-item>
+      </core-submenu>
+      
+    </core-menu>
+    
+There is a margin set on the submenu to indent the items.
+You can override the margin by doing:
+
+    core-submenu::shadow #submenu {
+      margin-left: 20px;
+    }
+
+@group Polymer Core Elements
+@element core-submenu
+@extends core-item
+-->
+
+<link rel="import" href="../core-item/core-item.html">
+<link rel="import" href="../core-menu/core-menu.html">
+<link rel="import" href="../core-collapse/core-collapse.html">
+
+<polymer-element name="core-submenu" attributes="selected selectedItem label icon src valueattr">
+<template>
+
+  <link rel="stylesheet" href="core-submenu.css">
+
+  <core-item src="{{src}}" label="{{label}}" icon="{{icon}}" class="{{ {'core-selected' : active} | tokenList}}" on-tap="{{activate}}">
+    <content select=".item-content"></content>
+  </core-item>
+
+  <core-menu id="submenu" selected="{{selected}}" selectedItem="{{selectedItem}}" valueattr="{{valueattr}}">
+    <content></content>
+  </core-menu>
+
+  <core-collapse target="{{$.submenu}}" opened="{{opened}}"></core-collapse>
+
+</template>
+<script>
+
+  Polymer('core-submenu', {
+
+    publish: {
+      active: {value: false, reflect: true}
+    },
+
+    opened: false,
+
+    get items() {
+      return this.$.submenu.items;
+    },
+
+    hasItems: function() {
+      return !!this.items.length;
+    },
+
+    unselectAllItems: function() {
+      this.$.submenu.selected = null;
+      this.$.submenu.clearSelection();
+    },
+
+    activeChanged: function() {
+      if (this.hasItems()) {
+        this.opened = this.active;
+      }
+      if (!this.active) {
+        this.unselectAllItems();
+      }
+    },
+    
+    toggle: function() {
+      this.opened = !this.opened;
+    },
+
+    activate: function() {
+      if (this.hasItems() && this.active) {
+        this.toggle();
+        this.unselectAllItems();
+      }
+    }
+    
+  });
+
+</script>
+</polymer-element>