Beanz/pdf.js
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
Improve the `StructTreeLayerBuilder.render` method
This commit is contained in:
calixteman 2024-09-04 14:07:18 +02:00 committed by GitHub
commit 4fb045b9eb
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 18 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
web/struct_tree_layer_builder.js
View File

@ -76,7 +76,9 @@ const HEADING_PATTERN = /^H(\d+)$/;
class StructTreeLayerBuilder { class StructTreeLayerBuilder {
#promise; #promise;
#treeDom = undefined; #treeDom = null;
#treePromise;
#elementAttributes = new Map(); #elementAttributes = new Map();
@ -85,13 +87,23 @@ class StructTreeLayerBuilder {
} }
async render() { async render() {
if (this.#treeDom !== undefined) { if (this.#treePromise) {
return this.#treeDom; 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; this.#promise = null;
treeDom?.classList.add("structTree");
return treeDom; this.#treeDom?.classList.add("structTree");
resolve(this.#treeDom);
return promise;
} }
async getAriaAttributes(annotationId) { async getAriaAttributes(annotationId) {