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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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6
web/app.js
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@ -538,7 +538,11 @@ const PDFViewerApplication = {
}
if (appConfig.annotationEditorParams) {
if (annotationEditorMode !== AnnotationEditorType.DISABLE) {
if (
((typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
typeof AbortSignal.any === "function") &&
annotationEditorMode !== AnnotationEditorType.DISABLE
) {
const editorHighlightButton = appConfig.toolbar?.editorHighlightButton;
if (editorHighlightButton && AppOptions.get("enableHighlightEditor")) {
editorHighlightButton.hidden = false;