fix image loading

dashboard-ui/thirdparty/iron-iconset-svg/iron-iconset-svg.html

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+<!--
+@license
+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="../iron-meta/iron-meta.html">
+
+<script>
+  /**
+   * The `iron-iconset-svg` element allows users to define their own icon sets
+   * that contain svg icons. The svg icon elements should be children of the
+   * `iron-iconset-svg` element. Multiple icons should be given distinct id's.
+   *
+   * Using svg elements to create icons has a few advantages over traditional
+   * bitmap graphics like jpg or png. Icons that use svg are vector based so they
+   * are resolution independent and should look good on any device. They are
+   * stylable via css. Icons can be themed, colorized, and even animated.
+   *
+   * Example:
+   *
+   *     <iron-iconset-svg id="my-svg-icons" iconSize="24">
+   *       <svg>
+   *         <defs>
+   *           <g id="shape">
+   *             <rect x="50" y="50" width="50" height="50" />
+   *             <circle cx="50" cy="50" r="50" />
+   *           </g>
+   *         </defs>
+   *       </svg>
+   *     </iron-iconset-svg>
+   *
+   * This will automatically register the icon set "my-svg-icons" to the iconset
+   * database.  To use these icons from within another element, make a
+   * `iron-iconset` element and call the `byId` method
+   * to retrieve a given iconset. To apply a particular icon inside an
+   * element use the `applyIcon` method. For example:
+   *
+   *     iconset.applyIcon(iconNode, 'car');
+   *
+   * @element iron-iconset-svg
+   * @demo demo/index.html
+   */
+  Polymer({
+
+    is: 'iron-iconset-svg',
+
+    properties: {
+
+      /**
+       * The name of the iconset.
+       *
+       * @attribute name
+       * @type string
+       */
+      name: {
+        type: String,
+        observer: '_nameChanged'
+      },
+
+      /**
+       * The size of an individual icon. Note that icons must be square.
+       *
+       * @attribute iconSize
+       * @type number
+       * @default 24
+       */
+      size: {
+        type: Number,
+        value: 24
+      }
+
+    },
+
+    /**
+     * Construct an array of all icon names in this iconset.
+     *
+     * @return {!Array} Array of icon names.
+     */
+    getIconNames: function() {
+      this._icons = this._createIconMap();
+      return Object.keys(this._icons).map(function(n) {
+        return this.name + ':' + n;
+      }, this);
+    },
+
+    /**
+     * Applies an icon to the given element.
+     *
+     * An svg icon is prepended to the element's shadowRoot if it exists,
+     * otherwise to the element itself.
+     *
+     * @method applyIcon
+     * @param {Element} element Element to which the icon is applied.
+     * @param {string} iconName Name of the icon to apply.
+     * @return {Element} The svg element which renders the icon.
+     */
+    applyIcon: function(element, iconName) {
+      // insert svg element into shadow root, if it exists
+      element = element.root || element;
+      // Remove old svg element
+      this.removeIcon(element);
+      // install new svg element
+      var svg = this._cloneIcon(iconName);
+      if (svg) {
+        var pde = Polymer.dom(element);
+        pde.insertBefore(svg, pde.childNodes[0]);
+        return element._svgIcon = svg;
+      }
+      return null;
+    },
+
+    /**
+     * Remove an icon from the given element by undoing the changes effected
+     * by `applyIcon`.
+     *
+     * @param {Element} element The element from which the icon is removed.
+     */
+    removeIcon: function(element) {
+      // Remove old svg element
+      if (element._svgIcon) {
+        Polymer.dom(element).removeChild(element._svgIcon);
+        element._svgIcon = null;
+      }
+    },
+
+    /**
+     *
+     * When name is changed, register iconset metadata
+     *
+     */
+    _nameChanged: function() {
+      new Polymer.IronMeta({type: 'iconset', key: this.name, value: this});
+    },
+
+    /**
+     * Create a map of child SVG elements by id.
+     *
+     * @return {!Object} Map of id's to SVG elements.
+     */
+    _createIconMap: function() {
+      // Objects chained to Object.prototype (`{}`) have members. Specifically,
+      // on FF there is a `watch` method that confuses the icon map, so we
+      // need to use a null-based object here.
+      var icons = Object.create(null);
+      Polymer.dom(this).querySelectorAll('[id]')
+        .forEach(function(icon) {
+          icons[icon.id] = icon;
+        });
+      return icons;
+    },
+
+    /**
+     * Produce installable clone of the SVG element matching `id` in this
+     * iconset, or `undefined` if there is no matching element.
+     *
+     * @return {Element} Returns an installable clone of the SVG element
+     * matching `id`.
+     */
+    _cloneIcon: function(id) {
+      // create the icon map on-demand, since the iconset itself has no discrete
+      // signal to know when it's children are fully parsed
+      this._icons = this._icons || this._createIconMap();
+      return this._prepareSvgClone(this._icons[id], this.size);
+    },
+
+    /**
+     * @param {Element} sourceSvg
+     * @param {number} size
+     * @return {Element}
+     */
+    _prepareSvgClone: function(sourceSvg, size) {
+      if (sourceSvg) {
+        var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
+        svg.setAttribute('viewBox', ['0', '0', size, size].join(' '));
+        svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
+        // TODO(dfreedm): `pointer-events: none` works around https://crbug.com/370136
+        // TODO(sjmiles): inline style may not be ideal, but avoids requiring a shadow-root
+        svg.style.cssText = 'pointer-events: none; display: block; width: 100%; height: 100%;';
+        svg.appendChild(sourceSvg.cloneNode(true)).removeAttribute('id');
+        return svg;
+      }
+      return null;
+    }
+
+  });
+</script>