third_party/polymer/v1_0/components-chromium/iron-selector/iron-multi-selectable-extracted.js

   1
   2   /** @polymerBehavior Polymer.IronMultiSelectableBehavior */
   3   Polymer.IronMultiSelectableBehaviorImpl = {
   4     properties: {
   5
   6       /**
   7        * If true, multiple selections are allowed.
   8        */
   9       multi: {
  10         type: Boolean,
  11         value: false,
  12         observer: 'multiChanged'
  13       },
  14
  15       /**
  16        * Gets or sets the selected elements. This is used instead of `selected` when `multi`
  17        * is true.
  18        */
  19       selectedValues: {
  20         type: Array,
  21         notify: true
  22       },
  23
  24       /**
  25        * Returns an array of currently selected items.
  26        */
  27       selectedItems: {
  28         type: Array,
  29         readOnly: true,
  30         notify: true
  31       },
  32
  33     },
  34
  35     observers: [
  36       '_updateSelected(attrForSelected, selectedValues)'
  37     ],
  38
  39     /**
  40      * Selects the given value. If the `multi` property is true, then the selected state of the
  41      * `value` will be toggled; otherwise the `value` will be selected.
  42      *
  43      * @method select
  44      * @param {string} value the value to select.
  45      */
  46     select: function(value) {
  47       if (this.multi) {
  48         if (this.selectedValues) {
  49           this._toggleSelected(value);
  50         } else {
  51           this.selectedValues = [value];
  52         }
  53       } else {
  54         this.selected = value;
  55       }
  56     },
  57
  58     multiChanged: function(multi) {
  59       this._selection.multi = multi;
  60     },
  61
  62     _updateSelected: function() {
  63       if (this.multi) {
  64         this._selectMulti(this.selectedValues);
  65       } else {
  66         this._selectSelected(this.selected);
  67       }
  68     },
  69
  70     _selectMulti: function(values) {
  71       this._selection.clear();
  72       if (values) {
  73         for (var i = 0; i < values.length; i++) {
  74           this._selection.setItemSelected(this._valueToItem(values[i]), true);
  75         }
  76       }
  77     },
  78
  79     _selectionChange: function() {
  80       var s = this._selection.get();
  81       if (this.multi) {
  82         this._setSelectedItems(s);
  83       } else {
  84         this._setSelectedItems([s]);
  85         this._setSelectedItem(s);
  86       }
  87     },
  88
  89     _toggleSelected: function(value) {
  90       var i = this.selectedValues.indexOf(value);
  91       var unselected = i < 0;
  92       if (unselected) {
  93         this.selectedValues.push(value);
  94       } else {
  95         this.selectedValues.splice(i, 1);
  96       }
  97       this._selection.setItemSelected(this._valueToItem(value), unselected);
  98     }
  99   };
 100
 101   /** @polymerBehavior */
 102   Polymer.IronMultiSelectableBehavior = [
 103     Polymer.IronSelectableBehavior,
 104     Polymer.IronMultiSelectableBehaviorImpl
 105   ];
 106