Index: samples/third_party/todomvc_performance/web/lib-elements/polymer-selection.html |
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-<!-- |
-Copyright 2013 The Polymer Authors. All rights reserved. |
-Use of this source code is governed by a BSD-style |
-license that can be found in the LICENSE file. |
---> |
-<!-- |
-/** |
- * @module Polymer Elements |
- */ |
---> |
-<!-- |
-/** |
- * The polymer-selection element is used to manage selection state. It has no |
- * visual appearance and is typically used in conjuneciton with another element. |
- * For example, <a href="polymer-selector.html">polymer-selector</a> |
- * use a polymer-selection to manage selection. |
- * |
- * To mark an item as selected, call the select(item) method on |
- * polymer-selection. Notice that the item itself is an argument to this method. |
- * The polymer-selection element manages selection state for any given set of |
- * items. When an item is selected, the `polymer-select` event is fired. |
- * The attribute "multi" indicates if multiple items can be selected at once. |
- * |
- * Example: |
- * |
- * <polymer-element name="selection-example"> |
- * <template> |
- * <style> |
- * ::-webkit-distributed(> .selected) { |
- * font-weight: bold; |
- * font-style: italic; |
- * } |
- * </style> |
- * <ul on-tap="{{itemTapAction}}"> |
- * <content></content> |
- * </ul> |
- * <polymer-selection id="selection" multi on-polymer-select="{{selectAction}}"></polymer-selection> |
- * </template> |
- * <script> |
- * Polymer('selection-example', { |
- * itemTapAction: function(e) { |
- * this.$.selection.select(e.target); |
- * }, |
- * selectAction: function(e, detail) { |
- * detail.item.classList.toggle('selected', detail.isSelected); |
- * } |
- * }); |
- * </script> |
- * </polymer-element> |
- * |
- * <selection-example> |
- * <li>Red</li> |
- * <li>Green</li> |
- * <li>Blue</li> |
- * </selection-example> |
- * |
- * @class polymer-selection |
- */ |
- /** |
- * Fired when an item's selection state is changed. This event is fired both |
- * when an item is selected or deselected. The `isSelected` detail property |
- * contains the selection state. |
- * |
- * @event polymer-select |
- * @param {Object} detail |
- * @param {boolean} detail.isSelected true for selection and false for deselection |
- * @param {Object} detail.item the item element |
- */ |
---> |
-<polymer-element name="polymer-selection" attributes="multi"> |
- <template> |
- <style> |
- :host { |
- display: none !important; |
- } |
- </style> |
- </template> |
- <script> |
- Polymer('polymer-selection', { |
- /** |
- * If true, multiple selections are allowed. |
- * |
- * @attribute multi |
- * @type boolean |
- * @default false |
- */ |
- multi: false, |
- ready: function() { |
- this.clear(); |
- }, |
- clear: function() { |
- this.selection = []; |
- }, |
- /** |
- * Retrieves the selected item(s). |
- * @method getSelection |
- * @returns Returns the selected item(s). If the multi property is true, |
- * getSelection will return an array, otherwise it will return |
- * the selected item or undefined if there is no selection. |
- */ |
- getSelection: function() { |
- return this.multi ? this.selection : this.selection[0]; |
- }, |
- /** |
- * Indicates if a given item is selected. |
- * @method isSelected |
- * @param {any} 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; |
- }, |
- setItemSelected: function(item, isSelected) { |
- if (item !== undefined && item !== null) { |
- if (isSelected) { |
- this.selection.push(item); |
- } else { |
- var i = this.selection.indexOf(item); |
- if (i >= 0) { |
- this.selection.splice(i, 1); |
- } |
- } |
- this.fire("polymer-select", {isSelected: isSelected, item: item}); |
- } |
- }, |
- /** |
- * Set 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 {any} item: The item to select. |
- */ |
- select: function(item) { |
- if (this.multi) { |
- this.toggle(item); |
- } else if (this.getSelection() !== item) { |
- this.setItemSelected(this.getSelection(), false); |
- this.setItemSelected(item, true); |
- } |
- }, |
- /** |
- * Toggles the selection state for `item`. |
- * @method toggle |
- * @param {any} item: The item to toggle. |
- */ |
- toggle: function(item) { |
- this.setItemSelected(item, !this.isSelected(item)); |
- } |
- }); |
- </script> |
-</polymer-element> |