source: imaps-frontend/node_modules/resize-observer-polyfill/dist/ResizeObserver.es.js

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Last change on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago

Update repo after prototype presentation
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1/**
2 * A collection of shims that provide minimal functionality of the ES6 collections.
3 *
4 * These implementations are not meant to be used outside of the ResizeObserver
5 * modules as they cover only a limited range of use cases.
6 */
7/* eslint-disable require-jsdoc, valid-jsdoc */
8var MapShim = (function () {
9 if (typeof Map !== 'undefined') {
10 return Map;
11 }
12 /**
13 * Returns index in provided array that matches the specified key.
14 *
15 * @param {Array<Array>} arr
16 * @param {*} key
17 * @returns {number}
18 */
19 function getIndex(arr, key) {
20 var result = -1;
21 arr.some(function (entry, index) {
22 if (entry[0] === key) {
23 result = index;
24 return true;
25 }
26 return false;
27 });
28 return result;
29 }
30 return /** @class */ (function () {
31 function class_1() {
32 this.__entries__ = [];
33 }
34 Object.defineProperty(class_1.prototype, "size", {
35 /**
36 * @returns {boolean}
37 */
38 get: function () {
39 return this.__entries__.length;
40 },
41 enumerable: true,
42 configurable: true
43 });
44 /**
45 * @param {*} key
46 * @returns {*}
47 */
48 class_1.prototype.get = function (key) {
49 var index = getIndex(this.__entries__, key);
50 var entry = this.__entries__[index];
51 return entry && entry[1];
52 };
53 /**
54 * @param {*} key
55 * @param {*} value
56 * @returns {void}
57 */
58 class_1.prototype.set = function (key, value) {
59 var index = getIndex(this.__entries__, key);
60 if (~index) {
61 this.__entries__[index][1] = value;
62 }
63 else {
64 this.__entries__.push([key, value]);
65 }
66 };
67 /**
68 * @param {*} key
69 * @returns {void}
70 */
71 class_1.prototype.delete = function (key) {
72 var entries = this.__entries__;
73 var index = getIndex(entries, key);
74 if (~index) {
75 entries.splice(index, 1);
76 }
77 };
78 /**
79 * @param {*} key
80 * @returns {void}
81 */
82 class_1.prototype.has = function (key) {
83 return !!~getIndex(this.__entries__, key);
84 };
85 /**
86 * @returns {void}
87 */
88 class_1.prototype.clear = function () {
89 this.__entries__.splice(0);
90 };
91 /**
92 * @param {Function} callback
93 * @param {*} [ctx=null]
94 * @returns {void}
95 */
96 class_1.prototype.forEach = function (callback, ctx) {
97 if (ctx === void 0) { ctx = null; }
98 for (var _i = 0, _a = this.__entries__; _i < _a.length; _i++) {
99 var entry = _a[_i];
100 callback.call(ctx, entry[1], entry[0]);
101 }
102 };
103 return class_1;
104 }());
105})();
106
107/**
108 * Detects whether window and document objects are available in current environment.
109 */
110var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined' && window.document === document;
111
112// Returns global object of a current environment.
113var global$1 = (function () {
114 if (typeof global !== 'undefined' && global.Math === Math) {
115 return global;
116 }
117 if (typeof self !== 'undefined' && self.Math === Math) {
118 return self;
119 }
120 if (typeof window !== 'undefined' && window.Math === Math) {
121 return window;
122 }
123 // eslint-disable-next-line no-new-func
124 return Function('return this')();
125})();
126
127/**
128 * A shim for the requestAnimationFrame which falls back to the setTimeout if
129 * first one is not supported.
130 *
131 * @returns {number} Requests' identifier.
132 */
133var requestAnimationFrame$1 = (function () {
134 if (typeof requestAnimationFrame === 'function') {
135 // It's required to use a bounded function because IE sometimes throws
136 // an "Invalid calling object" error if rAF is invoked without the global
137 // object on the left hand side.
138 return requestAnimationFrame.bind(global$1);
139 }
140 return function (callback) { return setTimeout(function () { return callback(Date.now()); }, 1000 / 60); };
141})();
142
143// Defines minimum timeout before adding a trailing call.
144var trailingTimeout = 2;
145/**
146 * Creates a wrapper function which ensures that provided callback will be
147 * invoked only once during the specified delay period.
148 *
149 * @param {Function} callback - Function to be invoked after the delay period.
150 * @param {number} delay - Delay after which to invoke callback.
151 * @returns {Function}
152 */
153function throttle (callback, delay) {
154 var leadingCall = false, trailingCall = false, lastCallTime = 0;
155 /**
156 * Invokes the original callback function and schedules new invocation if
157 * the "proxy" was called during current request.
158 *
159 * @returns {void}
160 */
161 function resolvePending() {
162 if (leadingCall) {
163 leadingCall = false;
164 callback();
165 }
166 if (trailingCall) {
167 proxy();
168 }
169 }
170 /**
171 * Callback invoked after the specified delay. It will further postpone
172 * invocation of the original function delegating it to the
173 * requestAnimationFrame.
174 *
175 * @returns {void}
176 */
177 function timeoutCallback() {
178 requestAnimationFrame$1(resolvePending);
179 }
180 /**
181 * Schedules invocation of the original function.
182 *
183 * @returns {void}
184 */
185 function proxy() {
186 var timeStamp = Date.now();
187 if (leadingCall) {
188 // Reject immediately following calls.
189 if (timeStamp - lastCallTime < trailingTimeout) {
190 return;
191 }
192 // Schedule new call to be in invoked when the pending one is resolved.
193 // This is important for "transitions" which never actually start
194 // immediately so there is a chance that we might miss one if change
195 // happens amids the pending invocation.
196 trailingCall = true;
197 }
198 else {
199 leadingCall = true;
200 trailingCall = false;
201 setTimeout(timeoutCallback, delay);
202 }
203 lastCallTime = timeStamp;
204 }
205 return proxy;
206}
207
208// Minimum delay before invoking the update of observers.
209var REFRESH_DELAY = 20;
210// A list of substrings of CSS properties used to find transition events that
211// might affect dimensions of observed elements.
212var transitionKeys = ['top', 'right', 'bottom', 'left', 'width', 'height', 'size', 'weight'];
213// Check if MutationObserver is available.
214var mutationObserverSupported = typeof MutationObserver !== 'undefined';
215/**
216 * Singleton controller class which handles updates of ResizeObserver instances.
217 */
218var ResizeObserverController = /** @class */ (function () {
219 /**
220 * Creates a new instance of ResizeObserverController.
221 *
222 * @private
223 */
224 function ResizeObserverController() {
225 /**
226 * Indicates whether DOM listeners have been added.
227 *
228 * @private {boolean}
229 */
230 this.connected_ = false;
231 /**
232 * Tells that controller has subscribed for Mutation Events.
233 *
234 * @private {boolean}
235 */
236 this.mutationEventsAdded_ = false;
237 /**
238 * Keeps reference to the instance of MutationObserver.
239 *
240 * @private {MutationObserver}
241 */
242 this.mutationsObserver_ = null;
243 /**
244 * A list of connected observers.
245 *
246 * @private {Array<ResizeObserverSPI>}
247 */
248 this.observers_ = [];
249 this.onTransitionEnd_ = this.onTransitionEnd_.bind(this);
250 this.refresh = throttle(this.refresh.bind(this), REFRESH_DELAY);
251 }
252 /**
253 * Adds observer to observers list.
254 *
255 * @param {ResizeObserverSPI} observer - Observer to be added.
256 * @returns {void}
257 */
258 ResizeObserverController.prototype.addObserver = function (observer) {
259 if (!~this.observers_.indexOf(observer)) {
260 this.observers_.push(observer);
261 }
262 // Add listeners if they haven't been added yet.
263 if (!this.connected_) {
264 this.connect_();
265 }
266 };
267 /**
268 * Removes observer from observers list.
269 *
270 * @param {ResizeObserverSPI} observer - Observer to be removed.
271 * @returns {void}
272 */
273 ResizeObserverController.prototype.removeObserver = function (observer) {
274 var observers = this.observers_;
275 var index = observers.indexOf(observer);
276 // Remove observer if it's present in registry.
277 if (~index) {
278 observers.splice(index, 1);
279 }
280 // Remove listeners if controller has no connected observers.
281 if (!observers.length && this.connected_) {
282 this.disconnect_();
283 }
284 };
285 /**
286 * Invokes the update of observers. It will continue running updates insofar
287 * it detects changes.
288 *
289 * @returns {void}
290 */
291 ResizeObserverController.prototype.refresh = function () {
292 var changesDetected = this.updateObservers_();
293 // Continue running updates if changes have been detected as there might
294 // be future ones caused by CSS transitions.
295 if (changesDetected) {
296 this.refresh();
297 }
298 };
299 /**
300 * Updates every observer from observers list and notifies them of queued
301 * entries.
302 *
303 * @private
304 * @returns {boolean} Returns "true" if any observer has detected changes in
305 * dimensions of it's elements.
306 */
307 ResizeObserverController.prototype.updateObservers_ = function () {
308 // Collect observers that have active observations.
309 var activeObservers = this.observers_.filter(function (observer) {
310 return observer.gatherActive(), observer.hasActive();
311 });
312 // Deliver notifications in a separate cycle in order to avoid any
313 // collisions between observers, e.g. when multiple instances of
314 // ResizeObserver are tracking the same element and the callback of one
315 // of them changes content dimensions of the observed target. Sometimes
316 // this may result in notifications being blocked for the rest of observers.
317 activeObservers.forEach(function (observer) { return observer.broadcastActive(); });
318 return activeObservers.length > 0;
319 };
320 /**
321 * Initializes DOM listeners.
322 *
323 * @private
324 * @returns {void}
325 */
326 ResizeObserverController.prototype.connect_ = function () {
327 // Do nothing if running in a non-browser environment or if listeners
328 // have been already added.
329 if (!isBrowser || this.connected_) {
330 return;
331 }
332 // Subscription to the "Transitionend" event is used as a workaround for
333 // delayed transitions. This way it's possible to capture at least the
334 // final state of an element.
335 document.addEventListener('transitionend', this.onTransitionEnd_);
336 window.addEventListener('resize', this.refresh);
337 if (mutationObserverSupported) {
338 this.mutationsObserver_ = new MutationObserver(this.refresh);
339 this.mutationsObserver_.observe(document, {
340 attributes: true,
341 childList: true,
342 characterData: true,
343 subtree: true
344 });
345 }
346 else {
347 document.addEventListener('DOMSubtreeModified', this.refresh);
348 this.mutationEventsAdded_ = true;
349 }
350 this.connected_ = true;
351 };
352 /**
353 * Removes DOM listeners.
354 *
355 * @private
356 * @returns {void}
357 */
358 ResizeObserverController.prototype.disconnect_ = function () {
359 // Do nothing if running in a non-browser environment or if listeners
360 // have been already removed.
361 if (!isBrowser || !this.connected_) {
362 return;
363 }
364 document.removeEventListener('transitionend', this.onTransitionEnd_);
365 window.removeEventListener('resize', this.refresh);
366 if (this.mutationsObserver_) {
367 this.mutationsObserver_.disconnect();
368 }
369 if (this.mutationEventsAdded_) {
370 document.removeEventListener('DOMSubtreeModified', this.refresh);
371 }
372 this.mutationsObserver_ = null;
373 this.mutationEventsAdded_ = false;
374 this.connected_ = false;
375 };
376 /**
377 * "Transitionend" event handler.
378 *
379 * @private
380 * @param {TransitionEvent} event
381 * @returns {void}
382 */
383 ResizeObserverController.prototype.onTransitionEnd_ = function (_a) {
384 var _b = _a.propertyName, propertyName = _b === void 0 ? '' : _b;
385 // Detect whether transition may affect dimensions of an element.
386 var isReflowProperty = transitionKeys.some(function (key) {
387 return !!~propertyName.indexOf(key);
388 });
389 if (isReflowProperty) {
390 this.refresh();
391 }
392 };
393 /**
394 * Returns instance of the ResizeObserverController.
395 *
396 * @returns {ResizeObserverController}
397 */
398 ResizeObserverController.getInstance = function () {
399 if (!this.instance_) {
400 this.instance_ = new ResizeObserverController();
401 }
402 return this.instance_;
403 };
404 /**
405 * Holds reference to the controller's instance.
406 *
407 * @private {ResizeObserverController}
408 */
409 ResizeObserverController.instance_ = null;
410 return ResizeObserverController;
411}());
412
413/**
414 * Defines non-writable/enumerable properties of the provided target object.
415 *
416 * @param {Object} target - Object for which to define properties.
417 * @param {Object} props - Properties to be defined.
418 * @returns {Object} Target object.
419 */
420var defineConfigurable = (function (target, props) {
421 for (var _i = 0, _a = Object.keys(props); _i < _a.length; _i++) {
422 var key = _a[_i];
423 Object.defineProperty(target, key, {
424 value: props[key],
425 enumerable: false,
426 writable: false,
427 configurable: true
428 });
429 }
430 return target;
431});
432
433/**
434 * Returns the global object associated with provided element.
435 *
436 * @param {Object} target
437 * @returns {Object}
438 */
439var getWindowOf = (function (target) {
440 // Assume that the element is an instance of Node, which means that it
441 // has the "ownerDocument" property from which we can retrieve a
442 // corresponding global object.
443 var ownerGlobal = target && target.ownerDocument && target.ownerDocument.defaultView;
444 // Return the local global object if it's not possible extract one from
445 // provided element.
446 return ownerGlobal || global$1;
447});
448
449// Placeholder of an empty content rectangle.
450var emptyRect = createRectInit(0, 0, 0, 0);
451/**
452 * Converts provided string to a number.
453 *
454 * @param {number|string} value
455 * @returns {number}
456 */
457function toFloat(value) {
458 return parseFloat(value) || 0;
459}
460/**
461 * Extracts borders size from provided styles.
462 *
463 * @param {CSSStyleDeclaration} styles
464 * @param {...string} positions - Borders positions (top, right, ...)
465 * @returns {number}
466 */
467function getBordersSize(styles) {
468 var positions = [];
469 for (var _i = 1; _i < arguments.length; _i++) {
470 positions[_i - 1] = arguments[_i];
471 }
472 return positions.reduce(function (size, position) {
473 var value = styles['border-' + position + '-width'];
474 return size + toFloat(value);
475 }, 0);
476}
477/**
478 * Extracts paddings sizes from provided styles.
479 *
480 * @param {CSSStyleDeclaration} styles
481 * @returns {Object} Paddings box.
482 */
483function getPaddings(styles) {
484 var positions = ['top', 'right', 'bottom', 'left'];
485 var paddings = {};
486 for (var _i = 0, positions_1 = positions; _i < positions_1.length; _i++) {
487 var position = positions_1[_i];
488 var value = styles['padding-' + position];
489 paddings[position] = toFloat(value);
490 }
491 return paddings;
492}
493/**
494 * Calculates content rectangle of provided SVG element.
495 *
496 * @param {SVGGraphicsElement} target - Element content rectangle of which needs
497 * to be calculated.
498 * @returns {DOMRectInit}
499 */
500function getSVGContentRect(target) {
501 var bbox = target.getBBox();
502 return createRectInit(0, 0, bbox.width, bbox.height);
503}
504/**
505 * Calculates content rectangle of provided HTMLElement.
506 *
507 * @param {HTMLElement} target - Element for which to calculate the content rectangle.
508 * @returns {DOMRectInit}
509 */
510function getHTMLElementContentRect(target) {
511 // Client width & height properties can't be
512 // used exclusively as they provide rounded values.
513 var clientWidth = target.clientWidth, clientHeight = target.clientHeight;
514 // By this condition we can catch all non-replaced inline, hidden and
515 // detached elements. Though elements with width & height properties less
516 // than 0.5 will be discarded as well.
517 //
518 // Without it we would need to implement separate methods for each of
519 // those cases and it's not possible to perform a precise and performance
520 // effective test for hidden elements. E.g. even jQuery's ':visible' filter
521 // gives wrong results for elements with width & height less than 0.5.
522 if (!clientWidth && !clientHeight) {
523 return emptyRect;
524 }
525 var styles = getWindowOf(target).getComputedStyle(target);
526 var paddings = getPaddings(styles);
527 var horizPad = paddings.left + paddings.right;
528 var vertPad = paddings.top + paddings.bottom;
529 // Computed styles of width & height are being used because they are the
530 // only dimensions available to JS that contain non-rounded values. It could
531 // be possible to utilize the getBoundingClientRect if only it's data wasn't
532 // affected by CSS transformations let alone paddings, borders and scroll bars.
533 var width = toFloat(styles.width), height = toFloat(styles.height);
534 // Width & height include paddings and borders when the 'border-box' box
535 // model is applied (except for IE).
536 if (styles.boxSizing === 'border-box') {
537 // Following conditions are required to handle Internet Explorer which
538 // doesn't include paddings and borders to computed CSS dimensions.
539 //
540 // We can say that if CSS dimensions + paddings are equal to the "client"
541 // properties then it's either IE, and thus we don't need to subtract
542 // anything, or an element merely doesn't have paddings/borders styles.
543 if (Math.round(width + horizPad) !== clientWidth) {
544 width -= getBordersSize(styles, 'left', 'right') + horizPad;
545 }
546 if (Math.round(height + vertPad) !== clientHeight) {
547 height -= getBordersSize(styles, 'top', 'bottom') + vertPad;
548 }
549 }
550 // Following steps can't be applied to the document's root element as its
551 // client[Width/Height] properties represent viewport area of the window.
552 // Besides, it's as well not necessary as the <html> itself neither has
553 // rendered scroll bars nor it can be clipped.
554 if (!isDocumentElement(target)) {
555 // In some browsers (only in Firefox, actually) CSS width & height
556 // include scroll bars size which can be removed at this step as scroll
557 // bars are the only difference between rounded dimensions + paddings
558 // and "client" properties, though that is not always true in Chrome.
559 var vertScrollbar = Math.round(width + horizPad) - clientWidth;
560 var horizScrollbar = Math.round(height + vertPad) - clientHeight;
561 // Chrome has a rather weird rounding of "client" properties.
562 // E.g. for an element with content width of 314.2px it sometimes gives
563 // the client width of 315px and for the width of 314.7px it may give
564 // 314px. And it doesn't happen all the time. So just ignore this delta
565 // as a non-relevant.
566 if (Math.abs(vertScrollbar) !== 1) {
567 width -= vertScrollbar;
568 }
569 if (Math.abs(horizScrollbar) !== 1) {
570 height -= horizScrollbar;
571 }
572 }
573 return createRectInit(paddings.left, paddings.top, width, height);
574}
575/**
576 * Checks whether provided element is an instance of the SVGGraphicsElement.
577 *
578 * @param {Element} target - Element to be checked.
579 * @returns {boolean}
580 */
581var isSVGGraphicsElement = (function () {
582 // Some browsers, namely IE and Edge, don't have the SVGGraphicsElement
583 // interface.
584 if (typeof SVGGraphicsElement !== 'undefined') {
585 return function (target) { return target instanceof getWindowOf(target).SVGGraphicsElement; };
586 }
587 // If it's so, then check that element is at least an instance of the
588 // SVGElement and that it has the "getBBox" method.
589 // eslint-disable-next-line no-extra-parens
590 return function (target) { return (target instanceof getWindowOf(target).SVGElement &&
591 typeof target.getBBox === 'function'); };
592})();
593/**
594 * Checks whether provided element is a document element (<html>).
595 *
596 * @param {Element} target - Element to be checked.
597 * @returns {boolean}
598 */
599function isDocumentElement(target) {
600 return target === getWindowOf(target).document.documentElement;
601}
602/**
603 * Calculates an appropriate content rectangle for provided html or svg element.
604 *
605 * @param {Element} target - Element content rectangle of which needs to be calculated.
606 * @returns {DOMRectInit}
607 */
608function getContentRect(target) {
609 if (!isBrowser) {
610 return emptyRect;
611 }
612 if (isSVGGraphicsElement(target)) {
613 return getSVGContentRect(target);
614 }
615 return getHTMLElementContentRect(target);
616}
617/**
618 * Creates rectangle with an interface of the DOMRectReadOnly.
619 * Spec: https://drafts.fxtf.org/geometry/#domrectreadonly
620 *
621 * @param {DOMRectInit} rectInit - Object with rectangle's x/y coordinates and dimensions.
622 * @returns {DOMRectReadOnly}
623 */
624function createReadOnlyRect(_a) {
625 var x = _a.x, y = _a.y, width = _a.width, height = _a.height;
626 // If DOMRectReadOnly is available use it as a prototype for the rectangle.
627 var Constr = typeof DOMRectReadOnly !== 'undefined' ? DOMRectReadOnly : Object;
628 var rect = Object.create(Constr.prototype);
629 // Rectangle's properties are not writable and non-enumerable.
630 defineConfigurable(rect, {
631 x: x, y: y, width: width, height: height,
632 top: y,
633 right: x + width,
634 bottom: height + y,
635 left: x
636 });
637 return rect;
638}
639/**
640 * Creates DOMRectInit object based on the provided dimensions and the x/y coordinates.
641 * Spec: https://drafts.fxtf.org/geometry/#dictdef-domrectinit
642 *
643 * @param {number} x - X coordinate.
644 * @param {number} y - Y coordinate.
645 * @param {number} width - Rectangle's width.
646 * @param {number} height - Rectangle's height.
647 * @returns {DOMRectInit}
648 */
649function createRectInit(x, y, width, height) {
650 return { x: x, y: y, width: width, height: height };
651}
652
653/**
654 * Class that is responsible for computations of the content rectangle of
655 * provided DOM element and for keeping track of it's changes.
656 */
657var ResizeObservation = /** @class */ (function () {
658 /**
659 * Creates an instance of ResizeObservation.
660 *
661 * @param {Element} target - Element to be observed.
662 */
663 function ResizeObservation(target) {
664 /**
665 * Broadcasted width of content rectangle.
666 *
667 * @type {number}
668 */
669 this.broadcastWidth = 0;
670 /**
671 * Broadcasted height of content rectangle.
672 *
673 * @type {number}
674 */
675 this.broadcastHeight = 0;
676 /**
677 * Reference to the last observed content rectangle.
678 *
679 * @private {DOMRectInit}
680 */
681 this.contentRect_ = createRectInit(0, 0, 0, 0);
682 this.target = target;
683 }
684 /**
685 * Updates content rectangle and tells whether it's width or height properties
686 * have changed since the last broadcast.
687 *
688 * @returns {boolean}
689 */
690 ResizeObservation.prototype.isActive = function () {
691 var rect = getContentRect(this.target);
692 this.contentRect_ = rect;
693 return (rect.width !== this.broadcastWidth ||
694 rect.height !== this.broadcastHeight);
695 };
696 /**
697 * Updates 'broadcastWidth' and 'broadcastHeight' properties with a data
698 * from the corresponding properties of the last observed content rectangle.
699 *
700 * @returns {DOMRectInit} Last observed content rectangle.
701 */
702 ResizeObservation.prototype.broadcastRect = function () {
703 var rect = this.contentRect_;
704 this.broadcastWidth = rect.width;
705 this.broadcastHeight = rect.height;
706 return rect;
707 };
708 return ResizeObservation;
709}());
710
711var ResizeObserverEntry = /** @class */ (function () {
712 /**
713 * Creates an instance of ResizeObserverEntry.
714 *
715 * @param {Element} target - Element that is being observed.
716 * @param {DOMRectInit} rectInit - Data of the element's content rectangle.
717 */
718 function ResizeObserverEntry(target, rectInit) {
719 var contentRect = createReadOnlyRect(rectInit);
720 // According to the specification following properties are not writable
721 // and are also not enumerable in the native implementation.
722 //
723 // Property accessors are not being used as they'd require to define a
724 // private WeakMap storage which may cause memory leaks in browsers that
725 // don't support this type of collections.
726 defineConfigurable(this, { target: target, contentRect: contentRect });
727 }
728 return ResizeObserverEntry;
729}());
730
731var ResizeObserverSPI = /** @class */ (function () {
732 /**
733 * Creates a new instance of ResizeObserver.
734 *
735 * @param {ResizeObserverCallback} callback - Callback function that is invoked
736 * when one of the observed elements changes it's content dimensions.
737 * @param {ResizeObserverController} controller - Controller instance which
738 * is responsible for the updates of observer.
739 * @param {ResizeObserver} callbackCtx - Reference to the public
740 * ResizeObserver instance which will be passed to callback function.
741 */
742 function ResizeObserverSPI(callback, controller, callbackCtx) {
743 /**
744 * Collection of resize observations that have detected changes in dimensions
745 * of elements.
746 *
747 * @private {Array<ResizeObservation>}
748 */
749 this.activeObservations_ = [];
750 /**
751 * Registry of the ResizeObservation instances.
752 *
753 * @private {Map<Element, ResizeObservation>}
754 */
755 this.observations_ = new MapShim();
756 if (typeof callback !== 'function') {
757 throw new TypeError('The callback provided as parameter 1 is not a function.');
758 }
759 this.callback_ = callback;
760 this.controller_ = controller;
761 this.callbackCtx_ = callbackCtx;
762 }
763 /**
764 * Starts observing provided element.
765 *
766 * @param {Element} target - Element to be observed.
767 * @returns {void}
768 */
769 ResizeObserverSPI.prototype.observe = function (target) {
770 if (!arguments.length) {
771 throw new TypeError('1 argument required, but only 0 present.');
772 }
773 // Do nothing if current environment doesn't have the Element interface.
774 if (typeof Element === 'undefined' || !(Element instanceof Object)) {
775 return;
776 }
777 if (!(target instanceof getWindowOf(target).Element)) {
778 throw new TypeError('parameter 1 is not of type "Element".');
779 }
780 var observations = this.observations_;
781 // Do nothing if element is already being observed.
782 if (observations.has(target)) {
783 return;
784 }
785 observations.set(target, new ResizeObservation(target));
786 this.controller_.addObserver(this);
787 // Force the update of observations.
788 this.controller_.refresh();
789 };
790 /**
791 * Stops observing provided element.
792 *
793 * @param {Element} target - Element to stop observing.
794 * @returns {void}
795 */
796 ResizeObserverSPI.prototype.unobserve = function (target) {
797 if (!arguments.length) {
798 throw new TypeError('1 argument required, but only 0 present.');
799 }
800 // Do nothing if current environment doesn't have the Element interface.
801 if (typeof Element === 'undefined' || !(Element instanceof Object)) {
802 return;
803 }
804 if (!(target instanceof getWindowOf(target).Element)) {
805 throw new TypeError('parameter 1 is not of type "Element".');
806 }
807 var observations = this.observations_;
808 // Do nothing if element is not being observed.
809 if (!observations.has(target)) {
810 return;
811 }
812 observations.delete(target);
813 if (!observations.size) {
814 this.controller_.removeObserver(this);
815 }
816 };
817 /**
818 * Stops observing all elements.
819 *
820 * @returns {void}
821 */
822 ResizeObserverSPI.prototype.disconnect = function () {
823 this.clearActive();
824 this.observations_.clear();
825 this.controller_.removeObserver(this);
826 };
827 /**
828 * Collects observation instances the associated element of which has changed
829 * it's content rectangle.
830 *
831 * @returns {void}
832 */
833 ResizeObserverSPI.prototype.gatherActive = function () {
834 var _this = this;
835 this.clearActive();
836 this.observations_.forEach(function (observation) {
837 if (observation.isActive()) {
838 _this.activeObservations_.push(observation);
839 }
840 });
841 };
842 /**
843 * Invokes initial callback function with a list of ResizeObserverEntry
844 * instances collected from active resize observations.
845 *
846 * @returns {void}
847 */
848 ResizeObserverSPI.prototype.broadcastActive = function () {
849 // Do nothing if observer doesn't have active observations.
850 if (!this.hasActive()) {
851 return;
852 }
853 var ctx = this.callbackCtx_;
854 // Create ResizeObserverEntry instance for every active observation.
855 var entries = this.activeObservations_.map(function (observation) {
856 return new ResizeObserverEntry(observation.target, observation.broadcastRect());
857 });
858 this.callback_.call(ctx, entries, ctx);
859 this.clearActive();
860 };
861 /**
862 * Clears the collection of active observations.
863 *
864 * @returns {void}
865 */
866 ResizeObserverSPI.prototype.clearActive = function () {
867 this.activeObservations_.splice(0);
868 };
869 /**
870 * Tells whether observer has active observations.
871 *
872 * @returns {boolean}
873 */
874 ResizeObserverSPI.prototype.hasActive = function () {
875 return this.activeObservations_.length > 0;
876 };
877 return ResizeObserverSPI;
878}());
879
880// Registry of internal observers. If WeakMap is not available use current shim
881// for the Map collection as it has all required methods and because WeakMap
882// can't be fully polyfilled anyway.
883var observers = typeof WeakMap !== 'undefined' ? new WeakMap() : new MapShim();
884/**
885 * ResizeObserver API. Encapsulates the ResizeObserver SPI implementation
886 * exposing only those methods and properties that are defined in the spec.
887 */
888var ResizeObserver = /** @class */ (function () {
889 /**
890 * Creates a new instance of ResizeObserver.
891 *
892 * @param {ResizeObserverCallback} callback - Callback that is invoked when
893 * dimensions of the observed elements change.
894 */
895 function ResizeObserver(callback) {
896 if (!(this instanceof ResizeObserver)) {
897 throw new TypeError('Cannot call a class as a function.');
898 }
899 if (!arguments.length) {
900 throw new TypeError('1 argument required, but only 0 present.');
901 }
902 var controller = ResizeObserverController.getInstance();
903 var observer = new ResizeObserverSPI(callback, controller, this);
904 observers.set(this, observer);
905 }
906 return ResizeObserver;
907}());
908// Expose public methods of ResizeObserver.
909[
910 'observe',
911 'unobserve',
912 'disconnect'
913].forEach(function (method) {
914 ResizeObserver.prototype[method] = function () {
915 var _a;
916 return (_a = observers.get(this))[method].apply(_a, arguments);
917 };
918});
919
920var index = (function () {
921 // Export existing implementation if available.
922 if (typeof global$1.ResizeObserver !== 'undefined') {
923 return global$1.ResizeObserver;
924 }
925 return ResizeObserver;
926})();
927
928export default index;
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