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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">
<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.isSelected(item)) {
// proceed to update selection only if requested state differs from current
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>
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