update elements and fix some bugs

lib/src/paper-tooltip/paper-tooltip.html

 <!--
 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
 -->
 
 
 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="../neon-animation/neon-animation-runner-behavior.html">
 <link rel="import" href="../neon-animation/animations/fade-in-animation.html">
 <link rel="import" href="../neon-animation/animations/fade-out-animation.html">
+
 <!--
+Material design: [Tooltips](https://www.google.com/design/spec/components/tooltips.html)
 
 `<paper-tooltip>` is a label that appears on hover and focus when the user
 hovers over an element with the cursor or with the keyboard. It will be centered
 to an anchor element specified in the `for` attribute, or, if that doesn't exist,
 centered to the parent node containing it.
 
 Example:
 
     <div style="display:inline-block">
       <button>Click me!</button>
@@ skipping 28 matching lines @@
 -->
 
 <dom-module id="paper-tooltip">
   <template>
     <style>
       :host {
         display: block;
         position: absolute;
         outline: none;
         z-index: 1002;
+        -moz-user-select: none;
+        -ms-user-select: none;
+        -webkit-user-select: none;
+        user-select: none;
+        cursor: default;
       }
 
       #tooltip {
         display: block;
         outline: none;
         @apply(--paper-font-common-base);
         font-size: 10px;
+        line-height: 1;
 
         background-color: var(--paper-tooltip-background, #616161);
         opacity: var(--paper-tooltip-opacity, 0.9);
         color: var(--paper-tooltip-text-color, white);
 
         padding: 8px;
         border-radius: 2px;
 
         @apply(--paper-tooltip);
       }
@@ skipping 61 matching lines @@
          * This property is deprecated, but left over so that it doesn't
          * break exiting code. Please use `offset` instead. If both `offset` and
          * `marginTop` are provided, `marginTop` will be ignored.
          * @deprecated since version 1.0.3
          */
         marginTop: {
           type: Number,
           value: 14
         },
 
+        /**
+         * The delay that will be applied before the `entry` animation is
+         * played when showing the tooltip.
+         */
+        animationDelay: {
+          type: Number,
+          value: 500
+        },
+
+        /**
+         * The entry and exit animations that will be played when showing and
+         * hiding the tooltip. If you want to override this, you must ensure
+         * that your animationConfig has the exact format below.
+         */
         animationConfig: {
           type: Object,
           value: function() {
             return {
               'entry': [{
                 name: 'fade-in-animation',
                 node: this,
-                timing: {delay: 500}
+                timing: {delay: 0}
               }],
               'exit': [{
                 name: 'fade-out-animation',
                 node: this
               }]
             }
           }
         },
 
         _showing: {
           type: Boolean,
           value: false
         }
       },
 
       listeners: {
-        'neon-animation-finish': '_onAnimationFinish'
+        'neon-animation-finish': '_onAnimationFinish',
+        'mouseenter': 'hide'
       },
 
       /**
        * Returns the target element that this tooltip is anchored to. It is
        * either the element given by the `for` attribute, or the immediate parent
        * of the tooltip.
        */
       get target () {
         var parentNode = Polymer.dom(this).parentNode;
         // If the parentNode is a document fragment, then we need to use the host.
@@ skipping 10 matching lines @@
         return target;
       },
 
       attached: function() {
         this._target = this.target;
 
         this.listen(this._target, 'mouseenter', 'show');
         this.listen(this._target, 'focus', 'show');
         this.listen(this._target, 'mouseleave', 'hide');
         this.listen(this._target, 'blur', 'hide');
+        this.listen(this._target, 'tap', 'hide');
       },
 
       detached: function() {
         if (this._target) {
           this.unlisten(this._target, 'mouseenter', 'show');
           this.unlisten(this._target, 'focus', 'show');
           this.unlisten(this._target, 'mouseleave', 'hide');
           this.unlisten(this._target, 'blur', 'hide');
+          this.unlisten(this._target, 'tap', 'hide');
         }
       },
 
       show: function() {
+        // If the tooltip is already showing, there's nothing to do.
         if (this._showing)
           return;
 
         if (Polymer.dom(this).textContent.trim() === '')
           return;
 
+
         this.cancelAnimation();
-
+        this._showing = true;
         this.toggleClass('hidden', false, this.$.tooltip);
         this.updatePosition();
-        this._showing = true;
 
+        this.animationConfig.entry[0].timing.delay = this.animationDelay;
+        this._animationPlaying = true;
         this.playAnimation('entry');
       },
 
       hide: function() {
-        if (!this._showing)
+        // If the tooltip is already hidden, there's nothing to do.
+        if (!this._showing) {
           return;
+        }
+
+        // If the entry animation is still playing, don't try to play the exit
+        // animation since this will reset the opacity to 1. Just end the animation.
+        if (this._animationPlaying) {
+          this.cancelAnimation();
+          this._showing = false;
+          this._onAnimationFinish();
+          return;
+        }
 
         this._showing = false;
+        this._animationPlaying = true;
         this.playAnimation('exit');
       },
 
       _forChanged: function() {
         this._target = this.target;
       },
 
       updatePosition: function() {
         if (!this._target)
           return;
@@ skipping 54 matching lines @@
             this.style.bottom = 'auto';
           }
         } else {
           this.style.left = tooltipLeft + 'px';
           this.style.top = tooltipTop + 'px';
         }
 
       },
 
       _onAnimationFinish: function() {
+        this._animationPlaying = false;
         if (!this._showing) {
           this.toggleClass('hidden', true, this.$.tooltip);
         }
       },
     });
   </script>
 </dom-module>