<!-- 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"> <script> /** * @param {!Function} selectCallback * @constructor */ Polymer.IronSelection = function(selectCallback) { this.selection = []; this.selectCallback = selectCallback; }; Polymer.IronSelection.prototype = { /** * Retrieves the selected item(s). * * @method get * @returns Returns the selected item(s). If the multi property is true, * `get` will return an array, otherwise it will return * the selected item or undefined if there is no selection. */ get: function() { return this.multi ? this.selection.slice() : this.selection[0]; }, /** * Clears all the selection except the ones indicated. * * @method clear * @param {Array} excludes items to be excluded. */ clear: function(excludes) { this.selection.slice().forEach(function(item) { if (!excludes || excludes.indexOf(item) < 0) { this.setItemSelected(item, false); } }, this); }, /** * Indicates if a given item is selected. * * @method isSelected * @param {*} item The item whose selection state should be checked. * @returns Returns true if `item` is selected. */ isSelected: function(item) { return this.selection.indexOf(item) >= 0; }, /** * Sets the selection state for a given item to either selected or deselected. * * @method setItemSelected * @param {*} item The item to select. * @param {boolean} isSelected True for selected, false for deselected. */ setItemSelected: function(item, isSelected) { if (item != null) { if (isSelected) { this.selection.push(item); } else { var i = this.selection.indexOf(item); if (i >= 0) { this.selection.splice(i, 1); } } if (this.selectCallback) { this.selectCallback(item, isSelected); } } }, /** * Sets the selection state for a given item. If the `multi` property * is true, then the selected state of `item` will be toggled; otherwise * the `item` will be selected. * * @method select * @param {*} item The item to select. */ select: function(item) { if (this.multi) { this.toggle(item); } else if (this.get() !== item) { this.setItemSelected(this.get(), false); this.setItemSelected(item, true); } }, /** * Toggles the selection state for `item`. * * @method toggle * @param {*} item The item to toggle. */ toggle: function(item) { this.setItemSelected(item, !this.isSelected(item)); } }; </script>