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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-selectable.html">
+
+<script>
+  /** @polymerBehavior Polymer.IronMultiSelectableBehavior */
+  Polymer.IronMultiSelectableBehaviorImpl = {
+    properties: {
+
+      /**
+       * If true, multiple selections are allowed.
+       */
+      multi: {
+        type: Boolean,
+        value: false,
+        observer: 'multiChanged'
+      },
+
+      /**
+       * Gets or sets the selected elements. This is used instead of `selected` when `multi`
+       * is true.
+       */
+      selectedValues: {
+        type: Array,
+        notify: true
+      },
+
+      /**
+       * Returns an array of currently selected items.
+       */
+      selectedItems: {
+        type: Array,
+        readOnly: true,
+        notify: true
+      },
+
+    },
+
+    observers: [
+      '_updateSelected(selectedValues.splices)'
+    ],
+
+    /**
+     * Selects the given value. If the `multi` property is true, then the selected state of the
+     * `value` will be toggled; otherwise the `value` will be selected.
+     *
+     * @method select
+     * @param {string|number} value the value to select.
+     */
+    select: function(value) {
+      if (this.multi) {
+        if (this.selectedValues) {
+          this._toggleSelected(value);
+        } else {
+          this.selectedValues = [value];
+        }
+      } else {
+        this.selected = value;
+      }
+    },
+
+    multiChanged: function(multi) {
+      this._selection.multi = multi;
+    },
+
+    get _shouldUpdateSelection() {
+      return this.selected != null ||
+        (this.selectedValues != null && this.selectedValues.length);
+    },
+
+    _updateAttrForSelected: function() {
+      if (!this.multi) {
+        Polymer.IronSelectableBehavior._updateAttrForSelected.apply(this);
+      } else if (this._shouldUpdateSelection) {
+        this.selectedValues = this.selectedItems.map(function(selectedItem) {
+          return this._indexToValue(this.indexOf(selectedItem));
+        }, this).filter(function(unfilteredValue) {
+          return unfilteredValue != null;
+        }, this);
+      }
+    },
+
+    _updateSelected: function() {
+      if (this.multi) {
+        this._selectMulti(this.selectedValues);
+      } else {
+        this._selectSelected(this.selected);
+      }
+    },
+
+    _selectMulti: function(values) {
+      if (values) {
+        var selectedItems = this._valuesToItems(values);
+        // clear all but the current selected items
+        this._selection.clear(selectedItems);
+        // select only those not selected yet
+        for (var i = 0; i < selectedItems.length; i++) {
+          this._selection.setItemSelected(selectedItems[i], true);
+        }
+        // Check for items, since this array is populated only when attached
+        if (this.fallbackSelection && this.items.length && !this._selection.get().length) {
+          var fallback = this._valueToItem(this.fallbackSelection);
+          if (fallback) {
+            this.selectedValues = [this.fallbackSelection];
+          }
+        }
+      } else {
+        this._selection.clear();
+      }
+    },
+
+    _selectionChange: function() {
+      var s = this._selection.get();
+      if (this.multi) {
+        this._setSelectedItems(s);
+      } else {
+        this._setSelectedItems([s]);
+        this._setSelectedItem(s);
+      }
+    },
+
+    _toggleSelected: function(value) {
+      var i = this.selectedValues.indexOf(value);
+      var unselected = i < 0;
+      if (unselected) {
+        this.push('selectedValues',value);
+      } else {
+        this.splice('selectedValues',i,1);
+      }
+    },
+
+    _valuesToItems: function(values) {
+      return (values == null) ? null : values.map(function(value) {
+        return this._valueToItem(value);
+      }, this);
+    }
+  };
+
+  /** @polymerBehavior */
+  Polymer.IronMultiSelectableBehavior = [
+    Polymer.IronSelectableBehavior,
+    Polymer.IronMultiSelectableBehaviorImpl
+  ];
+
+</script>