| 1 | /**
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| 2 | * @license Copyright (c) 2003-2024, CKSource Holding sp. z o.o. All rights reserved.
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| 3 | * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
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| 4 | */
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| 5 | /**
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| 6 | * @module image/image/imageloadobserver
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| 7 | */
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| 8 | import { Observer } from 'ckeditor5/src/engine.js';
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| 9 | /**
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| 10 | * Observes all new images added to the {@link module:engine/view/document~Document},
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| 11 | * fires {@link module:engine/view/document~Document#event:imageLoaded} and
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| 12 | * {@link module:engine/view/document~Document#event:layoutChanged} event every time when the new image
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| 13 | * has been loaded.
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| 14 | *
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| 15 | * **Note:** This event is not fired for images that has been added to the document and rendered as `complete` (already loaded).
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| 16 | */
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| 17 | export default class ImageLoadObserver extends Observer {
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| 18 | /**
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| 19 | * @inheritDoc
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| 20 | */
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| 21 | observe(domRoot) {
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| 22 | this.listenTo(domRoot, 'load', (event, domEvent) => {
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| 23 | const domElement = domEvent.target;
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| 24 | if (this.checkShouldIgnoreEventFromTarget(domElement)) {
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| 25 | return;
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| 26 | }
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| 27 | if (domElement.tagName == 'IMG') {
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| 28 | this._fireEvents(domEvent);
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| 29 | }
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| 30 | // Use capture phase for better performance (#4504).
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| 31 | }, { useCapture: true });
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| 32 | }
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| 33 | /**
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| 34 | * @inheritDoc
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| 35 | */
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| 36 | stopObserving(domRoot) {
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| 37 | this.stopListening(domRoot);
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| 38 | }
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| 39 | /**
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| 40 | * Fires {@link module:engine/view/document~Document#event:layoutChanged} and
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| 41 | * {@link module:engine/view/document~Document#event:imageLoaded}
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| 42 | * if observer {@link #isEnabled is enabled}.
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| 43 | *
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| 44 | * @param domEvent The DOM event.
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| 45 | */
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| 46 | _fireEvents(domEvent) {
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| 47 | if (this.isEnabled) {
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| 48 | this.document.fire('layoutChanged');
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| 49 | this.document.fire('imageLoaded', domEvent);
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| 50 | }
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| 51 | }
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| 52 | }
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