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[Editor] Remove event listeners with AbortSignal.any()

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There's a fair number of event listeners in the editor-code that we're currently removing "manually", by keeping references to their event handler functions.
This was necessary since we have a "global" `AbortController` that applies to all event listeners used in the editor-code, however it's now possible to combine multiple `AbortSignal`s; please see https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/any_static

Since this functionality is [fairly new](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/any_static#browser_compatibility) the viewer will check that `AbortSignal.any()` is available before enabling the editing-functionality.
(It should hopefully be fairly straightforward, famous last words, for users to implement a polyfill to allow editing in older browsers.)

Finally, this patch also adds checks and test-only asserts to ensure that we don't add duplicate event listeners in various editor-code.
This commit is contained in:
Jonas Jenwald 2024-08-08 13:09:16 +02:00
parent 4569e88778
commit c0bf3d3c94
9 changed files with 202 additions and 193 deletions
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web/pdf_viewer.js
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@ -797,10 +797,8 @@ class PDFViewer {
this.findController?.setDocument(null);
this._scriptingManager?.setDocument(null);
if (this.#annotationEditorUIManager) {
this.#annotationEditorUIManager.destroy();
this.#annotationEditorUIManager = null;
}
this.#annotationEditorUIManager?.destroy();
this.#annotationEditorUIManager = null;
}
this.pdfDocument = pdfDocument;