/**
@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
*/
import"../polymer/polymer-legacy.js";import{dom as e}from"../polymer/lib/legacy/polymer.dom.js";import{dashToCamelCase as t}from"../polymer/lib/utils/case-map.js";import{IronSelection as i}from"./iron-selection.js";export const IronSelectableBehavior={properties:{attrForSelected:{type:String,value:null},selected:{type:String,notify:!0},selectedItem:{type:Object,readOnly:!0,notify:!0},activateEvent:{type:String,value:"tap",observer:"_activateEventChanged"},selectable:String,selectedClass:{type:String,value:"iron-selected"},selectedAttribute:{type:String,value:null},fallbackSelection:{type:String,value:null},items:{type:Array,readOnly:!0,notify:!0,value:function(){return[]}},_excludedLocalNames:{type:Object,value:function(){return{template:1,"dom-bind":1,"dom-if":1,"dom-repeat":1}}}},observers:["_updateAttrForSelected(attrForSelected)","_updateSelected(selected)","_checkFallback(fallbackSelection)"],created:function(){this._bindFilterItem=this._filterItem.bind(this),this._selection=new i(this._applySelection.bind(this))},attached:function(){this._observer=this._observeItems(this),this._addListener(this.activateEvent)},detached:function(){this._observer&&e(this).unobserveNodes(this._observer),this._removeListener(this.activateEvent)},indexOf:function(e){return this.items?this.items.indexOf(e):-1},select:function(e){this.selected=e},selectPrevious:function(){var e=this.items.length,t=e-1;void 0!==this.selected&&(t=(Number(this._valueToIndex(this.selected))-1+e)%e),this.selected=this._indexToValue(t)},selectNext:function(){var e=0;void 0!==this.selected&&(e=(Number(this._valueToIndex(this.selected))+1)%this.items.length),this.selected=this._indexToValue(e)},selectIndex:function(e){this.select(this._indexToValue(e))},forceSynchronousItemUpdate:function(){this._observer&&"function"==typeof this._observer.flush?this._observer.flush():this._updateItems()},get _shouldUpdateSelection(){return null!=this.selected},_checkFallback:function(){this._updateSelected()},_addListener:function(e){this.listen(this,e,"_activateHandler")},_removeListener:function(e){this.unlisten(this,e,"_activateHandler")},_activateEventChanged:function(e,t){this._removeListener(t),this._addListener(e)},_updateItems:function(){var t=e(this).queryDistributedElements(this.selectable||"*");t=Array.prototype.filter.call(t,this._bindFilterItem),this._setItems(t)},_updateAttrForSelected:function(){this.selectedItem&&(this.selected=this._valueForItem(this.selectedItem))},_updateSelected:function(){this._selectSelected(this.selected)},_selectSelected:function(e){if(this.items){var t=this._valueToItem(this.selected);t?this._selection.select(t):this._selection.clear(),this.fallbackSelection&&this.items.length&&void 0===this._selection.get()&&(this.selected=this.fallbackSelection)}},_filterItem:function(e){return!this._excludedLocalNames[e.localName]},_valueToItem:function(e){return null==e?null:this.items[this._valueToIndex(e)]},_valueToIndex:function(e){if(!this.attrForSelected)return Number(e);for(var t,i=0;t=this.items[i];i++)if(this._valueForItem(t)==e)return i},_indexToValue:function(e){if(!this.attrForSelected)return e;var t=this.items[e];return t?this._valueForItem(t):void 0},_valueForItem:function(e){if(!e)return null;if(!this.attrForSelected){var i=this.indexOf(e);return-1===i?null:i}var s=e[t(this.attrForSelected)];return null!=s?s:e.getAttribute(this.attrForSelected)},_applySelection:function(e,t){this.selectedClass&&this.toggleClass(this.selectedClass,t,e),this.selectedAttribute&&this.toggleAttribute(this.selectedAttribute,t,e),this._selectionChange(),this.fire("iron-"+(t?"select":"deselect"),{item:e})},_selectionChange:function(){this._setSelectedItem(this._selection.get())},_observeItems:function(t){return e(t).observeNodes((function(e){this._updateItems(),this._updateSelected(),this.fire("iron-items-changed",e,{bubbles:!1,cancelable:!1})}))},_activateHandler:function(e){for(var t=e.target,i=this.items;t&&t!=this;){var s=i.indexOf(t);if(s>=0){var l=this._indexToValue(s);return void this._itemActivate(l,t)}t=t.parentNode}},_itemActivate:function(e,t){this.fire("iron-activate",{selected:e,item:t},{cancelable:!0}).defaultPrevented||this.select(e)}};