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| 1 // Copyright 2013 The Polymer Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style | |
| 3 // license that can be found in the LICENSE file. | |
| 4 | |
| 5 library todomvc.web.lib_elements.polymer_selector; | |
| 6 | |
| 7 import 'dart:html'; | |
| 8 import 'package:polymer/polymer.dart'; | |
| 9 import 'package:template_binding/template_binding.dart' show | |
| 10 nodeBind, isSemanticTemplate; | |
| 11 import 'polymer_selection.dart'; | |
| 12 | |
| 13 // TODO(jmesserly): get this from polymer_ui_elements package. | |
| 14 @CustomTag('polymer-selector') | |
| 15 class PolymerSelector extends PolymerElement { | |
| 16 /** | |
| 17 * Gets or sets the selected element. Default is to use the index | |
| 18 * of the currently selected element. | |
| 19 * | |
| 20 * If you want a specific attribute value of the selected element to be | |
| 21 * used instead of index, set "valueattr" to that attribute name. | |
| 22 * | |
| 23 * Example: | |
| 24 * | |
| 25 * <polymer-selector valueattr="label" selected="foo"> | |
| 26 * <div label="foo"></div> | |
| 27 * <div label="bar"></div> | |
| 28 * <div label="zot"></div> | |
| 29 * </polymer-selector> | |
| 30 */ | |
| 31 @published String selected; | |
| 32 | |
| 33 /** If true, multiple selections are allowed. */ | |
| 34 @published bool multi = false; | |
| 35 | |
| 36 /** Specifies the attribute to be used for "selected" attribute. */ | |
| 37 @published String valueattr = 'name'; | |
| 38 | |
| 39 /** Specifies the CSS class to be used to add to the selected element. */ | |
| 40 @published String selectedClass = 'polymer-selected'; | |
| 41 | |
| 42 /** | |
| 43 * Specifies the property to be used to set on the selected element | |
| 44 * to indicate its active state. | |
| 45 */ | |
| 46 @published String selectedProperty = 'active'; | |
| 47 | |
| 48 /** Returns the model associated with the selected element. */ | |
| 49 @published var selectedModel; | |
| 50 | |
| 51 @published bool notap = false; | |
| 52 | |
| 53 @observable var selectedItem; | |
| 54 | |
| 55 factory PolymerSelector() => new Element.tag('polymer-selector'); | |
| 56 PolymerSelector.created() : super.created(); | |
| 57 | |
| 58 List<Node> get items => ($['items'] as ContentElement).getDistributedNodes() | |
| 59 .where((n) => !isSemanticTemplate(n)).toList(); | |
| 60 | |
| 61 get selection => ($['selection'] as PolymerSelection).getSelection(); | |
| 62 | |
| 63 void selectedChanged() { | |
| 64 valueToSelection(selected); | |
| 65 } | |
| 66 | |
| 67 void valueToSelection(value) { | |
| 68 var item = items.firstWhere((i) => valueForNode(i) == value, | |
| 69 orElse: () => null); | |
| 70 | |
| 71 selectedItem = item; | |
| 72 ($['selection'] as PolymerSelection).select(item); | |
| 73 updateSelectedModel(); | |
| 74 } | |
| 75 | |
| 76 void updateSelectedModel() { | |
| 77 if (selectedItem != null) { | |
| 78 var t = nodeBind(selectedItem).templateInstance; | |
| 79 selectedModel = t != null ? t.model : null; | |
| 80 } else { | |
| 81 selectedModel = null; | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 String valueForNode(node) { | |
| 86 // TODO(jmesserly): faster way to do this | |
| 87 var value = new PathObserver(node, valueattr).value; | |
| 88 return value != null ? value : node.attributes[valueattr]; | |
| 89 } | |
| 90 | |
| 91 // events fired from <polymer-selection> object | |
| 92 void selectionSelect(e, PolymerSelectEventDetail detail) { | |
| 93 if (detail.item != null) { | |
| 94 if (selectedClass != null) { | |
| 95 detail.item.classes.toggle(selectedClass, detail.isSelected); | |
| 96 } | |
| 97 if (selectedProperty != null) { | |
| 98 new PathObserver(detail.item, selectedProperty).value = | |
| 99 detail.isSelected; | |
| 100 } | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 // event fired from host | |
| 105 void activateHandler(e) { | |
| 106 if (!notap) { | |
| 107 var i = findDistributedTarget(e.target, items); | |
| 108 if (i >= 0) { | |
| 109 var selected = valueForNode(items[i]); | |
| 110 if (selected == null) selected = i; | |
| 111 if (multi) { | |
| 112 valueToSelection(selected); | |
| 113 } else { | |
| 114 this.selected = selected; | |
| 115 } | |
| 116 asyncFire('polymer-activate', detail: | |
| 117 new PolymerActivateEventDetail(items[i])); | |
| 118 } | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 int findDistributedTarget(Node target, List<Node> nodes) { | |
| 123 // find first ancestor of target (including itself) that | |
| 124 // is in inNodes, if any | |
| 125 while (target != null && target != this) { | |
| 126 var i = nodes.indexOf(target); | |
| 127 if (i >= 0) return i; | |
| 128 target = target.parentNode; | |
| 129 } | |
| 130 return -1; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 class PolymerActivateEventDetail { | |
| 135 final item; | |
| 136 | |
| 137 PolymerActivateEventDetail(this.item); | |
| 138 } | |
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Chromium Code Reviews
Issue 182193002:
[polymer] interop with polymer-element and polymer.js (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart