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+<!--
+Copyright (c) 2015 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.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+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.txt
+-->
+
+<!--
+The `core-tooltip` element creates a hover tooltip centered for the content
+it contains. It can be positioned on the top|bottom|left|right of content using
+the `position` attribute.
+
+To include HTML in the tooltip, include the `tip` attribute on the relevant
+content.
+
+<b>Example</b>:
+
+    <core-tooltip label="I'm a tooltip">
+      <span>Hover over me.</span>
+    </core-tooltip>
+
+<b>Example</b> - positioning the tooltip to the right:
+
+    <core-tooltip label="I'm a tooltip to the right" position="right">
+      <core-icon-button icon="drawer"></core-icon-button>
+    </core-tooltip>
+
+<b>Example</b> - no arrow and showing by default:
+
+    <core-tooltip label="Tooltip with no arrow and always on" noarrow show>
+      <img src="image.jpg">
+    </core-tooltip>
+
+<b>Example</b> - disable the tooltip.
+
+    <core-tooltip label="Disabled label never shows" disabled>
+      ...
+    </core-tooltip>
+
+<b>Example</b> - rich tooltip using the `tip` attribute:
+
+    <core-tooltip>
+      <div>Example of a rich information tooltip</div>
+      <div tip>
+        <img src="profile.jpg">Foo <b>Bar</b> - <a href="#">@baz</a>
+      </div>
+    </core-tooltip>
+
+By default, the `tip` attribute specifies the HTML content for a rich tooltip.
+You can customize this attribute with the `tipAttribute` attribute:
+
+    <core-tooltip tipAttribute="htmltooltip">
+      <div>Example of a rich information tooltip</div>
+      <div htmltooltip>
+        ...
+      </div>
+    </core-tooltip>
+
+@group Polymer Core Elements
+@element core-tooltip
+@mixins Polymer.CoreFocusable https://github.com/polymer/core-focusable
+@mixins Polymer.CoreResizable https://github.com/polymer/core-resizable
+@homepage http://www.polymer-project.org/components/core-tooltip/index.html
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../core-focusable/core-focusable.html">
+<link rel="import" href="../core-resizable/core-resizable.html">
+
+<!-- TODO: would be nice to inherit from label to get .htmlFor, and .control,
+           but the latter is readonly. -->
+<!-- TODO: support off center arrows. -->
+<!-- TODO: detect mobile and apply the .large class, instead of manual
+           control. -->
+<!-- TODO: possibly reuse core-overlay. -->
+<polymer-element name="core-tooltip" attributes="noarrow position label show tipAttribute" role="tooltip" tabindex="0">
+<template>
+  <link rel="stylesheet" href="core-tooltip.css">
+
+  <div id="tooltip" hidden?="{{!hasTooltipContent}}"
+       class="core-tooltip {{position}} {{ {noarrow: noarrow, show: show && !disabled} | tokenList}}">
+    <content id="c" select="[{{tipAttribute}}]">{{label}}</content>
+  </div>
+
+  <content></content>
+
+</template>
+<script>
+(function() {
+
+  var proto = {
+
+      /**
+       * A simple string label for the tooltip to display. To display a rich
+       * HTML tooltip instead, omit `label` and include the `tip` attribute
+       * on a child node of `core-tooltip`.
+       *
+       * @attribute label
+       * @type string
+       * @default null
+       */
+      label: null,
+
+      eventDelegates: {
+        'core-resize': 'positionChanged'
+      },
+
+      computed: {
+        // Indicates whether the tooltip has a set label propety or
+        // an element with the `tip` attribute.
+        hasTooltipContent: 'label || !!tipElement'
+      },
+
+      publish: {
+        /**
+         * Forces the tooltip to display. If `disabled` is set, this property is ignored.
+         *
+         * @attribute show
+         * @type boolean
+         * @default false
+         */
+        show: {value: false, reflect: true},
+
+        /**
+         * Positions the tooltip to the top, right, bottom, left of its content.
+         *
+         * @attribute position
+         * @type string
+         * @default 'bottom'
+         */
+        position: {value: 'bottom', reflect: true},
+
+        /**
+         * If true, the tooltip an arrow pointing towards the content.
+         *
+         * @attribute noarrow
+         * @type boolean
+         * @default false
+         */
+        noarrow: {value: false, reflect: true}
+      },
+
+      /**
+       * Customizes the attribute used to specify which content
+       * is the rich HTML tooltip.
+       *
+       * @attribute tipAttribute
+       * @type string
+       * @default 'tip'
+       */
+      tipAttribute: 'tip',
+
+      attached: function() {
+        this.updatedChildren();
+        this.resizableAttachedHandler();
+      },
+
+      detached: function() {
+        this.resizableDetachedHandler();
+      },
+
+      updatedChildren: function () {
+        this.tipElement = null;
+
+        for (var i = 0, el; el = this.$.c.getDistributedNodes()[i]; ++i) {
+          if (el.hasAttribute && el.hasAttribute(this.tipAttribute)) {
+            this.tipElement = el;
+            break;
+          }
+        }
+
+        // Job ensures we're not double calling setPosition() on DOM attach.
+        this.job('positionJob', this.setPosition);
+
+        // Monitor children to re-position tooltip when light dom changes.
+        this.onMutation(this, this.updatedChildren);
+      },
+
+      labelChanged: function(oldVal, newVal) {
+        this.job('positionJob', this.setPosition);
+      },
+
+      positionChanged: function(oldVal, newVal) {
+        this.job('positionJob', this.setPosition);
+      },
+
+      setPosition: function() {
+        var controlWidth = this.clientWidth;
+        var controlHeight = this.clientHeight;
+        var toolTipWidth = this.$.tooltip.clientWidth;
+        var toolTipHeight = this.$.tooltip.clientHeight;
+
+        switch (this.position) {
+          case 'top':
+          case 'bottom':
+            this.$.tooltip.style.left = (controlWidth - toolTipWidth) / 2 + 'px';
+            this.$.tooltip.style.top = null;
+            break;
+          case 'left':
+          case 'right':
+            this.$.tooltip.style.left = null;
+            this.$.tooltip.style.top = (controlHeight - toolTipHeight) / 2 + 'px';
+            break;
+        }
+      }
+
+    };
+
+    Polymer.mixin2(proto, Polymer.CoreFocusable);
+    Polymer.mixin(proto, Polymer.CoreResizable);
+    Polymer(proto);
+  })();
+
+</script>
+</polymer-element>