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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>
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