Copybara bot | be50d49 | 2023-11-30 00:16:42 +0100 | [diff] [blame] | 1 | 'use strict'; |
| 2 | |
| 3 | var _getIterator2 = require('babel-runtime/core-js/get-iterator'); |
| 4 | |
| 5 | var _getIterator3 = _interopRequireDefault(_getIterator2); |
| 6 | |
| 7 | var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck'); |
| 8 | |
| 9 | var _classCallCheck3 = _interopRequireDefault(_classCallCheck2); |
| 10 | |
| 11 | var _createClass2 = require('babel-runtime/helpers/createClass'); |
| 12 | |
| 13 | var _createClass3 = _interopRequireDefault(_createClass2); |
| 14 | |
| 15 | var _intervalFunction = require('./interval-function'); |
| 16 | |
| 17 | var _intervalFunction2 = _interopRequireDefault(_intervalFunction); |
| 18 | |
| 19 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
| 20 | |
| 21 | (function (window, document) { |
| 22 | 'use strict'; |
| 23 | |
| 24 | if (typeof window.ResizeObserver !== 'undefined') { |
| 25 | return; |
| 26 | } |
| 27 | |
| 28 | document.resizeObservers = []; |
| 29 | |
| 30 | /** |
| 31 | * The content rect is defined in section 2.3 ResizeObserverEntry of the spec |
| 32 | * @param target the element to calculate the content rect for |
| 33 | * @return {{top: (Number|number), left: (Number|number), width: number, height: number}} |
| 34 | * |
| 35 | * Note: |
| 36 | * Avoid using margins on the observed element. The calculation can return incorrect values when margins are involved. |
| 37 | * |
| 38 | * The following CSS will report incorrect width (Chrome OSX): |
| 39 | * |
| 40 | * <div id="outer" style="width: 300px; height:300px; background-color: green;overflow:auto;"> |
| 41 | * <div id="observed" style="width: 400px; height:400px; background-color: yellow; margin:30px; border: 20px solid red; padding:10px;"> |
| 42 | * </div> |
| 43 | * </div> |
| 44 | * |
| 45 | * The calculated width is 280. The actual (correct) width is 340 since Chrome clips the margin. |
| 46 | * |
| 47 | * Use an outer container if you really need a "margin": |
| 48 | * |
| 49 | * <div id="outer" style="width: 300px; height:300px; background-color: green;overflow:auto; padding:30px;"> |
| 50 | * <div id="observed" style="width: 400px; height:400px; background-color: yellow; margin: 0; border: 20px solid red; padding:10px;"> |
| 51 | * </div> |
| 52 | * </div> |
| 53 | * |
| 54 | * A more detailed explanation can be fund here: |
| 55 | * http://stackoverflow.com/questions/21064101/understanding-offsetwidth-clientwidth-scrollwidth-and-height-respectively |
| 56 | */ |
| 57 | var getContentRect = function getContentRect(target) { |
| 58 | var cs = window.getComputedStyle(target); |
| 59 | var r = target.getBoundingClientRect(); |
| 60 | var top = parseFloat(cs.paddingTop) || 0; |
| 61 | var left = parseFloat(cs.paddingLeft) || 0; |
| 62 | var width = r.width - ((parseFloat(cs.marginLeft) || 0) + (parseFloat(cs.marginRight) || 0) + (parseFloat(cs.borderLeftWidth) || 0) + (parseFloat(cs.borderRightWidth) || 0) + left + (parseFloat(cs.paddingRight) || 0)); |
| 63 | var height = r.height - ((parseFloat(cs.marginTop) || 0) + (parseFloat(cs.marginBottom) || 0) + (parseFloat(cs.borderTopWidth) || 0) + (parseFloat(cs.borderBottomWidth) || 0) + top + (parseFloat(cs.paddingBottom) || 0)); |
| 64 | return { width: width, height: height, top: top, left: left }; |
| 65 | }; |
| 66 | |
| 67 | var dimensionHasChanged = function dimensionHasChanged(target, lastWidth, lastHeight) { |
| 68 | var _getContentRect = getContentRect(target), |
| 69 | width = _getContentRect.width, |
| 70 | height = _getContentRect.height; |
| 71 | |
| 72 | return width !== lastWidth || height !== lastHeight; |
| 73 | }; |
| 74 | |
| 75 | /** |
| 76 | * ResizeObservation holds observation information for a single Element. |
| 77 | * @param target |
| 78 | * @return {{target: *, broadcastWidth, broadcastHeight, isOrphan: (function()), isActive: (function())}} |
| 79 | * @constructor |
| 80 | */ |
| 81 | var ResizeObservation = function ResizeObservation(target) { |
| 82 | var _getContentRect2 = getContentRect(target), |
| 83 | width = _getContentRect2.width, |
| 84 | height = _getContentRect2.height; |
| 85 | |
| 86 | return { |
| 87 | target: target, |
| 88 | broadcastWidth: width, |
| 89 | broadcastHeight: height, |
| 90 | |
| 91 | isOrphan: function isOrphan() { |
| 92 | return !this.target || !this.target.parentNode; |
| 93 | }, |
| 94 | isActive: function isActive() { |
| 95 | return dimensionHasChanged(this.target, this.broadcastWidth, this.broadcastHeight); |
| 96 | } |
| 97 | }; |
| 98 | }; |
| 99 | |
| 100 | /** |
| 101 | * A snapshot of the observed element |
| 102 | * @param target |
| 103 | * @param rect |
| 104 | * @return {{target: *, contentRect: *}} |
| 105 | * @constructor |
| 106 | */ |
| 107 | var ResizeObserverEntry = function ResizeObserverEntry(target, rect) { |
| 108 | return { |
| 109 | target: target, |
| 110 | contentRect: rect |
| 111 | }; |
| 112 | }; |
| 113 | |
| 114 | /** |
| 115 | * The ResizeObserver is used to observe changes to Element's content rect. |
| 116 | */ |
| 117 | |
| 118 | var ResizeObserver = function () { |
| 119 | |
| 120 | /** |
| 121 | * Constructor for instantiating new Resize observers. |
| 122 | * @param callback void (sequence<ResizeObserverEntry> entries). The function which will be called on each resize. |
| 123 | * @throws {TypeError} |
| 124 | */ |
| 125 | function ResizeObserver(callback) { |
| 126 | (0, _classCallCheck3.default)(this, ResizeObserver); |
| 127 | |
| 128 | |
| 129 | if (typeof callback !== 'function') { |
| 130 | throw new TypeError('callback parameter must be a function'); |
| 131 | } |
| 132 | |
| 133 | this.callback_ = callback; |
| 134 | this.observationTargets_ = []; |
| 135 | this.activeTargets_ = []; |
| 136 | |
| 137 | document.resizeObservers.push(this); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * A list of ResizeObservations. It represents all Elements being observed. |
| 142 | * |
| 143 | * @return {Array} |
| 144 | */ |
| 145 | |
| 146 | |
| 147 | (0, _createClass3.default)(ResizeObserver, [{ |
| 148 | key: 'observe', |
| 149 | |
| 150 | |
| 151 | /** |
| 152 | * Adds target to the list of observed elements. |
| 153 | * @param {HTMLElement} target The target to observe |
| 154 | */ |
| 155 | value: function observe(target) { |
| 156 | if (target) { |
| 157 | if (!(target instanceof HTMLElement)) { |
| 158 | throw new TypeError('target parameter must be an HTMLElement'); |
| 159 | } |
| 160 | if (!this.observationTargets_.find(function (t) { |
| 161 | return t.target === target; |
| 162 | })) { |
| 163 | this.observationTargets_.push(ResizeObservation(target)); |
| 164 | resizeController.start(); |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Removes target from the list of observed elements. |
| 171 | * @param target The target to remove |
| 172 | */ |
| 173 | |
| 174 | }, { |
| 175 | key: 'unobserve', |
| 176 | value: function unobserve(target) { |
| 177 | var i = this.observationTargets_.findIndex(function (t) { |
| 178 | return t.target === target; |
| 179 | }); |
| 180 | if (i > -1) { |
| 181 | this.observationTargets_.splice(i, 1); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Stops the ResizeObserver instance from receiving notifications of resize changes. |
| 187 | * Until the observe() method is used again, observer's callback will not be invoked. |
| 188 | */ |
| 189 | |
| 190 | }, { |
| 191 | key: 'disconnect', |
| 192 | value: function disconnect() { |
| 193 | this.observationTargets_ = []; |
| 194 | this.activeTargets_ = []; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Removes the ResizeObserver from the list of observers |
| 199 | */ |
| 200 | |
| 201 | }, { |
| 202 | key: 'destroy', |
| 203 | value: function destroy() { |
| 204 | var _this = this; |
| 205 | |
| 206 | this.disconnect(); |
| 207 | var i = document.resizeObservers.findIndex(function (o) { |
| 208 | return o === _this; |
| 209 | }); |
| 210 | if (i > -1) { |
| 211 | document.resizeObservers.splice(i, 1); |
| 212 | } |
| 213 | } |
| 214 | }, { |
| 215 | key: 'deleteOrphansAndPopulateActiveTargets_', |
| 216 | value: function deleteOrphansAndPopulateActiveTargets_() { |
| 217 | |
| 218 | // Works, but two iterations |
| 219 | //this.observationTargets_ = this.observationTargets_.filter( resizeObervation => !resizeObervation.isOrphan()); |
| 220 | //this.activeTargets_ = this.observationTargets_.filter( resizeObervation => resizeObervation.isActive()); |
| 221 | |
| 222 | // Same result as above, one iteration |
| 223 | /* |
| 224 | this.activeTargets_ = []; |
| 225 | let n = this.observationTargets_.length-1; |
| 226 | while(n >= 0) { |
| 227 | if(this.observationTargets_[n].isOrphan()) { |
| 228 | this.observationTargets_.splice(n, 1); |
| 229 | } |
| 230 | else if(this.observationTargets_[n].isActive()) { |
| 231 | this.activeTargets_.push(this.observationTargets_[n]); |
| 232 | } |
| 233 | n -= 1; |
| 234 | } |
| 235 | */ |
| 236 | |
| 237 | // Same result as above - but reduce is cooler :-) |
| 238 | this.activeTargets_ = this.observationTargets_.reduceRight(function (prev, resizeObservation, index, arr) { |
| 239 | if (resizeObservation.isOrphan()) { |
| 240 | arr.splice(index, 1); |
| 241 | } else if (resizeObservation.isActive()) { |
| 242 | prev.push(resizeObservation); |
| 243 | } |
| 244 | return prev; |
| 245 | }, []); |
| 246 | } |
| 247 | }, { |
| 248 | key: 'broadcast_', |
| 249 | value: function broadcast_() { |
| 250 | this.deleteOrphansAndPopulateActiveTargets_(); |
| 251 | if (this.activeTargets_.length > 0) { |
| 252 | var entries = []; |
| 253 | var _iteratorNormalCompletion = true; |
| 254 | var _didIteratorError = false; |
| 255 | var _iteratorError = undefined; |
| 256 | |
| 257 | try { |
| 258 | for (var _iterator = (0, _getIterator3.default)(this.activeTargets_), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) { |
| 259 | var resizeObservation = _step.value; |
| 260 | |
| 261 | var rect = getContentRect(resizeObservation.target); |
| 262 | resizeObservation.broadcastWidth = rect.width; |
| 263 | resizeObservation.broadcastHeight = rect.height; |
| 264 | entries.push(ResizeObserverEntry(resizeObservation.target, rect)); |
| 265 | } |
| 266 | } catch (err) { |
| 267 | _didIteratorError = true; |
| 268 | _iteratorError = err; |
| 269 | } finally { |
| 270 | try { |
| 271 | if (!_iteratorNormalCompletion && _iterator.return) { |
| 272 | _iterator.return(); |
| 273 | } |
| 274 | } finally { |
| 275 | if (_didIteratorError) { |
| 276 | throw _iteratorError; |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | this.callback_(entries); |
| 282 | this.activeTargets_ = []; |
| 283 | } |
| 284 | } |
| 285 | }, { |
| 286 | key: 'observationTargets', |
| 287 | get: function get() { |
| 288 | return this.observationTargets_; |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * A list of ResizeObservations. It represents all Elements whose size has |
| 293 | * changed since last observation broadcast that are eligible for broadcast. |
| 294 | * |
| 295 | * @return {Array} |
| 296 | */ |
| 297 | |
| 298 | }, { |
| 299 | key: 'activeTargets', |
| 300 | get: function get() { |
| 301 | return this.activeTargets_; |
| 302 | } |
| 303 | }]); |
| 304 | return ResizeObserver; |
| 305 | }(); |
| 306 | |
| 307 | //let interval = require('./interval-function'); |
| 308 | |
| 309 | /** |
| 310 | * Broadcasts Element.resize events |
| 311 | * @return {{start: (function()), stop: (function())}} |
| 312 | * @constructor |
| 313 | */ |
| 314 | |
| 315 | |
| 316 | var ResizeController = function ResizeController() { |
| 317 | |
| 318 | var shouldStop = function shouldStop() { |
| 319 | return document.resizeObservers.findIndex(function (resizeObserver) { |
| 320 | return resizeObserver.observationTargets.length > 0; |
| 321 | }) > -1; |
| 322 | }; |
| 323 | |
| 324 | var execute = function execute() { |
| 325 | //console.log('***** Execute'); |
| 326 | var _iteratorNormalCompletion2 = true; |
| 327 | var _didIteratorError2 = false; |
| 328 | var _iteratorError2 = undefined; |
| 329 | |
| 330 | try { |
| 331 | for (var _iterator2 = (0, _getIterator3.default)(document.resizeObservers), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) { |
| 332 | var resizeObserver = _step2.value; |
| 333 | |
| 334 | resizeObserver.broadcast_(); |
| 335 | } |
| 336 | } catch (err) { |
| 337 | _didIteratorError2 = true; |
| 338 | _iteratorError2 = err; |
| 339 | } finally { |
| 340 | try { |
| 341 | if (!_iteratorNormalCompletion2 && _iterator2.return) { |
| 342 | _iterator2.return(); |
| 343 | } |
| 344 | } finally { |
| 345 | if (_didIteratorError2) { |
| 346 | throw _iteratorError2; |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | return shouldStop(); |
| 352 | }; |
| 353 | |
| 354 | var interval = (0, _intervalFunction2.default)(200); |
| 355 | |
| 356 | return { |
| 357 | start: function start() { |
| 358 | if (!interval.started) { |
| 359 | //console.log('***** Start poll'); |
| 360 | interval.start(execute); |
| 361 | } |
| 362 | } |
| 363 | }; |
| 364 | }; |
| 365 | |
| 366 | window.ResizeObserver = ResizeObserver; |
| 367 | |
| 368 | var resizeController = ResizeController(); |
| 369 | //console.log('***** ResizeObserver ready'); |
| 370 | })(window, document); |
| 371 | /** |
| 372 | * An API for observing changes to Element’s size. |
| 373 | * |
| 374 | * @See https://wicg.github.io/ResizeObserver/ |
| 375 | * @ee https://github.com/pelotoncycle/resize-observer |
| 376 | * |
| 377 | */ |