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fix #520 Add the ability to listen to attribute changes for an element
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96 changes: 96 additions & 0 deletions
96
domino-ui/src/main/java/org/dominokit/domino/ui/utils/AttributesObserver.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| /* | ||
| * Copyright © 2019 Dominokit | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.dominokit.domino.ui.utils; | ||
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|
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| import static elemental2.dom.DomGlobal.document; | ||
| import static org.dominokit.domino.ui.utils.ElementsFactory.elements; | ||
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| import elemental2.core.JsArray; | ||
| import elemental2.dom.CustomEvent; | ||
| import elemental2.dom.CustomEventInit; | ||
| import elemental2.dom.Element; | ||
| import elemental2.dom.MutationObserver; | ||
| import elemental2.dom.MutationObserverInit; | ||
| import elemental2.dom.MutationRecord; | ||
| import jsinterop.base.Js; | ||
|
|
||
| /** | ||
| * The {@code BodyObserver} class is responsible for observing mutations in the document's body. It | ||
| * tracks the addition and removal of elements with specific attributes and dispatches events | ||
| * accordingly. | ||
| */ | ||
| final class AttributesObserver { | ||
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| private static boolean ready = false; | ||
| private static boolean paused = false; | ||
| private static MutationObserver mutationObserver; | ||
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| private AttributesObserver() {} | ||
|
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| /** | ||
| * Pauses the observer for a specified action and resumes it afterward. | ||
| * | ||
| * @param handler The action to perform while the observer is paused. | ||
| */ | ||
| static void pauseFor(Runnable handler) { | ||
| mutationObserver.disconnect(); | ||
| try { | ||
| handler.run(); | ||
| } finally { | ||
| observe(); | ||
| } | ||
| } | ||
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| /** Starts observing mutations in the document's body. */ | ||
| static void startObserving() { | ||
| if (!ready) { | ||
| mutationObserver = | ||
| new MutationObserver( | ||
| (JsArray<MutationRecord> records, MutationObserver observer) -> { | ||
| if (!paused) { | ||
| MutationRecord[] recordsArray = | ||
| Js.uncheckedCast(records.asArray(new MutationRecord[records.length])); | ||
| for (MutationRecord record : recordsArray) { | ||
| if ("attributes".equalsIgnoreCase(record.type)) { | ||
| onElementAttributesChanged(record); | ||
| } | ||
| } | ||
| } | ||
| return null; | ||
| }); | ||
|
|
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| observe(); | ||
| ready = true; | ||
| } | ||
| } | ||
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| private static void onElementAttributesChanged(MutationRecord record) { | ||
| CustomEventInit<MutationRecord> ceinit = CustomEventInit.create(); | ||
| ceinit.setDetail(record); | ||
| DominoElement<Element> element = elements.elementOf(Js.<Element>uncheckedCast(record.target)); | ||
| String type = ObserverEventType.attributeType(element); | ||
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| CustomEvent<MutationRecord> event = new CustomEvent<>(type, ceinit); | ||
| element.element().dispatchEvent(event); | ||
| } | ||
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| private static void observe() { | ||
| MutationObserverInit mutationObserverInit = MutationObserverInit.create(); | ||
| mutationObserverInit.setSubtree(true); | ||
| mutationObserverInit.setAttributes(true); | ||
| mutationObserver.observe(document.body, mutationObserverInit); | ||
| } | ||
| } |
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