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| 1 | +// Copyright 2025 The Flutter Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style license that can be |
| 3 | +// found in the LICENSE file. |
| 4 | + |
| 5 | +import 'dart:math'; |
| 6 | + |
| 7 | +import 'package:jaspr/jaspr.dart'; |
| 8 | +import 'package:universal_web/js_interop.dart'; |
| 9 | +import 'package:universal_web/web.dart' as web; |
| 10 | + |
| 11 | +import '../../analytics/analytics.dart'; |
| 12 | +import '../../models/learning_resource_model.dart'; |
| 13 | +import '../util/global_event_listener.dart'; |
| 14 | +import 'learning_resource_filters_sidebar.dart'; |
| 15 | + |
| 16 | +class ResourceInfo { |
| 17 | + ResourceInfo({ |
| 18 | + required this.name, |
| 19 | + required this.type, |
| 20 | + required this.tags, |
| 21 | + required this.description, |
| 22 | + }); |
| 23 | + |
| 24 | + factory ResourceInfo.fromElement(web.Element element) { |
| 25 | + final dataType = element.getAttribute('data-type') ?? ''; |
| 26 | + final dataTags = element.getAttribute('data-tags') ?? ''; |
| 27 | + final dataDescription = element.getAttribute('data-description') ?? ''; |
| 28 | + |
| 29 | + return ResourceInfo( |
| 30 | + name: element.id, |
| 31 | + type: LearningResourceType.values.firstWhere( |
| 32 | + (type) => type.id == dataType, |
| 33 | + orElse: () => LearningResourceType.sample, |
| 34 | + ), |
| 35 | + tags: dataTags |
| 36 | + .split(',') |
| 37 | + .map((t) => t.trim().toLowerCase()) |
| 38 | + .map((tagId) { |
| 39 | + return LearningResourceTag.values |
| 40 | + .where((tag) => tag.id == tagId) |
| 41 | + .firstOrNull; |
| 42 | + }) |
| 43 | + .nonNulls |
| 44 | + .toList(), |
| 45 | + description: dataDescription, |
| 46 | + ); |
| 47 | + } |
| 48 | + |
| 49 | + final String name; |
| 50 | + final LearningResourceType type; |
| 51 | + final List<LearningResourceTag> tags; |
| 52 | + final String description; |
| 53 | +} |
| 54 | + |
| 55 | +@client |
| 56 | +class LearningResourceFilters extends StatefulComponent { |
| 57 | + const LearningResourceFilters({super.key}); |
| 58 | + |
| 59 | + @override |
| 60 | + State<LearningResourceFilters> createState() => |
| 61 | + _LearningResourceFiltersState(); |
| 62 | +} |
| 63 | + |
| 64 | +class _LearningResourceFiltersState extends State<LearningResourceFilters> { |
| 65 | + String searchQuery = ''; |
| 66 | + |
| 67 | + FiltersNotifier get filters => LearningResourceFiltersSidebar.filters; |
| 68 | + |
| 69 | + final List<ResourceInfo> resourceInfos = []; |
| 70 | + int filteredResourcesCount = 0; |
| 71 | + |
| 72 | + @override |
| 73 | + void initState() { |
| 74 | + super.initState(); |
| 75 | + |
| 76 | + if (kIsWeb) { |
| 77 | + filters.addListener(setFilters); |
| 78 | + |
| 79 | + final resourceGrid = web.document.getElementById('all-resources-grid'); |
| 80 | + if (resourceGrid == null) { |
| 81 | + return; |
| 82 | + } |
| 83 | + |
| 84 | + final resourceCards = resourceGrid.querySelectorAll('.card'); |
| 85 | + loadResourceInfos(resourceCards); |
| 86 | + shuffleCards(resourceGrid); |
| 87 | + } |
| 88 | + } |
| 89 | + |
| 90 | + void loadResourceInfos(web.NodeList resourceCards) { |
| 91 | + for (var i = 0; i < resourceCards.length; i++) { |
| 92 | + final element = resourceCards.item(i) as web.Element; |
| 93 | + final info = ResourceInfo.fromElement(element); |
| 94 | + resourceInfos.add(info); |
| 95 | + |
| 96 | + element.addEventListener( |
| 97 | + 'click', |
| 98 | + ((web.Event event) { |
| 99 | + analytics.sendEvent('learning_resource_index_click', { |
| 100 | + 'learning_resource_type': info.type.id, |
| 101 | + 'learning_resource_title': info.name, |
| 102 | + }); |
| 103 | + }).toJS, |
| 104 | + ); |
| 105 | + } |
| 106 | + } |
| 107 | + |
| 108 | + void shuffleCards(web.Element container) { |
| 109 | + final r = Random(); |
| 110 | + final elements = container.childNodes; |
| 111 | + for (var i = elements.length; i > 0; i--) { |
| 112 | + final card = elements.item(r.nextInt(i)); |
| 113 | + container.appendChild(card!); |
| 114 | + } |
| 115 | + } |
| 116 | + |
| 117 | + /// Update the filter state and re-evaluate which resources to show. |
| 118 | + /// |
| 119 | + /// Use like the `setState` method by passing a callback that updates |
| 120 | + /// the relevant state variables. |
| 121 | + /// |
| 122 | + /// Example: |
| 123 | + /// |
| 124 | + /// ```dart |
| 125 | + /// setFilters(() { |
| 126 | + /// searchQuery = '...'; |
| 127 | + /// }); |
| 128 | + /// ``` |
| 129 | + void setFilters([void Function()? callback]) { |
| 130 | + setState(callback ?? () {}); |
| 131 | + |
| 132 | + final resourcesToShow = filters.filterResources(resourceInfos, searchQuery); |
| 133 | + filteredResourcesCount = resourcesToShow.length; |
| 134 | + for (final info in resourceInfos) { |
| 135 | + final element = |
| 136 | + web.document.getElementById(info.name) as web.HTMLElement?; |
| 137 | + if (element == null) { |
| 138 | + continue; |
| 139 | + } |
| 140 | + |
| 141 | + if (resourcesToShow.contains(info)) { |
| 142 | + element.classList.remove('hidden'); |
| 143 | + } else { |
| 144 | + element.classList.add('hidden'); |
| 145 | + } |
| 146 | + } |
| 147 | + } |
| 148 | + |
| 149 | + @override |
| 150 | + void dispose() { |
| 151 | + if (kIsWeb) { |
| 152 | + filters.removeListener(setFilters); |
| 153 | + } |
| 154 | + super.dispose(); |
| 155 | + } |
| 156 | + |
| 157 | + @override |
| 158 | + Component build(BuildContext context) { |
| 159 | + return div(id: 'resource-search-group', classes: 'chip-filters-group', [ |
| 160 | + div(classes: 'top-row', [ |
| 161 | + div(classes: 'search-wrapper', id: 'resource-search', [ |
| 162 | + span( |
| 163 | + classes: 'material-symbols leading-icon', |
| 164 | + attributes: {'aria-hidden': 'true', 'translate': 'no'}, |
| 165 | + [text('search')], |
| 166 | + ), |
| 167 | + input( |
| 168 | + type: InputType.search, |
| 169 | + attributes: { |
| 170 | + 'placeholder': 'Try "button" or "networking"...', |
| 171 | + 'aria-label': 'Search learning resources by name and category', |
| 172 | + }, |
| 173 | + value: searchQuery, |
| 174 | + onInput: (value) { |
| 175 | + setFilters(() { |
| 176 | + searchQuery = value as String; |
| 177 | + }); |
| 178 | + }, |
| 179 | + ), |
| 180 | + ]), |
| 181 | + GlobalEventListener( |
| 182 | + onClick: (event) { |
| 183 | + final target = event.target as web.Element?; |
| 184 | + // If clicking outside the filters or toggle, close the filters. |
| 185 | + if (target?.closest('#resource-filter-group-wrapper') == null && |
| 186 | + target?.closest('.show-filters-button') == null) { |
| 187 | + final toggle = |
| 188 | + web.document.getElementById('open-filter-toggle') |
| 189 | + as web.HTMLInputElement?; |
| 190 | + toggle?.checked = false; |
| 191 | + } |
| 192 | + }, |
| 193 | + button( |
| 194 | + classes: 'icon-button show-filters-button', |
| 195 | + onClick: () { |
| 196 | + final toggle = |
| 197 | + web.document.getElementById('open-filter-toggle') |
| 198 | + as web.HTMLInputElement?; |
| 199 | + toggle?.checked = !toggle.checked; |
| 200 | + }, |
| 201 | + [ |
| 202 | + span( |
| 203 | + classes: 'material-symbols', |
| 204 | + attributes: {'aria-hidden': 'true', 'translate': 'no'}, |
| 205 | + [text('filter_list')], |
| 206 | + ), |
| 207 | + ], |
| 208 | + ), |
| 209 | + ), |
| 210 | + ]), |
| 211 | + div(classes: 'label-row', [ |
| 212 | + label( |
| 213 | + attributes: {'for': 'resource-search'}, |
| 214 | + [ |
| 215 | + text('Showing '), |
| 216 | + span([text('$filteredResourcesCount')]), |
| 217 | + text(' / '), |
| 218 | + span([text('${resourceInfos.length}')]), |
| 219 | + ], |
| 220 | + ), |
| 221 | + button( |
| 222 | + attributes: { |
| 223 | + if (searchQuery.isEmpty && |
| 224 | + filters.selectedTags.isEmpty && |
| 225 | + filters.selectedTypes.isEmpty) |
| 226 | + 'disabled': 'true', |
| 227 | + }, |
| 228 | + onClick: () { |
| 229 | + setState(() { |
| 230 | + searchQuery = ''; |
| 231 | + }); |
| 232 | + filters.reset(); |
| 233 | + }, |
| 234 | + [ |
| 235 | + span( |
| 236 | + classes: 'material-symbols', |
| 237 | + attributes: {'aria-hidden': 'true', 'translate': 'no'}, |
| 238 | + [text('close_small')], |
| 239 | + ), |
| 240 | + span([text('Clear filters')]), |
| 241 | + ], |
| 242 | + ), |
| 243 | + ]), |
| 244 | + ]); |
| 245 | + } |
| 246 | +} |
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