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Merge pull request #18689 from Snuffleupagus/StructTreeLayerBuilder-render-caching

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Improve the `StructTreeLayerBuilder.render` method
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calixteman 2024-09-04 14:07:18 +02:00 • committed by GitHub
commit 4fb045b9eb
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1 changed files with 18 additions and 6 deletions
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24
web/struct_tree_layer_builder.js
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@ -76,7 +76,9 @@ const HEADING_PATTERN = /^H(\d+)$/;
class StructTreeLayerBuilder {
#promise;
#treeDom = undefined;
#treeDom = null;
#treePromise;
#elementAttributes = new Map();
@ -85,13 +87,23 @@ class StructTreeLayerBuilder {
}
async render() {
if (this.#treeDom !== undefined) {
return this.#treeDom;
if (this.#treePromise) {
return this.#treePromise;
}
const { promise, resolve, reject } = Promise.withResolvers();
this.#treePromise = promise;
try {
this.#treeDom = this.#walk(await this.#promise);
} catch (ex) {
reject(ex);
}
const treeDom = (this.#treeDom = this.#walk(await this.#promise));
this.#promise = null;
treeDom?.classList.add("structTree");
return treeDom;
this.#treeDom?.classList.add("structTree");
resolve(this.#treeDom);
return promise;
}
async getAriaAttributes(annotationId) {