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Remove event listeners with signal in web/pdf_history.js

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This commit is contained in:
Jonas Jenwald 2024-04-18 20:06:02 +02:00
parent 702ee7b1e1
commit bf785f2180
1 changed files with 12 additions and 18 deletions
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30
web/pdf_history.js
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@ -53,6 +53,8 @@ function getCurrentHash() {
}
class PDFHistory {
#eventAbortController = null;
/**
* @param {PDFHistoryOptions} options
*/
@ -64,7 +66,6 @@ class PDFHistory {
this._fingerprint = "";
this.reset();
this._boundEvents = null;
// Ensure that we don't miss a "pagesinit" event,
// by registering the listener immediately.
this.eventBus._on("pagesinit", () => {
@ -679,29 +680,22 @@ class PDFHistory {
}
#bindEvents() {
if (this._boundEvents) {
if (this.#eventAbortController) {
return; // The event listeners were already added.
}
this._boundEvents = {
updateViewarea: this.#updateViewarea.bind(this),
popState: this.#popState.bind(this),
pageHide: this.#pageHide.bind(this),
};
this.#eventAbortController = new AbortController();
const { signal } = this.#eventAbortController;
this.eventBus._on("updateviewarea", this._boundEvents.updateViewarea);
window.addEventListener("popstate", this._boundEvents.popState);
window.addEventListener("pagehide", this._boundEvents.pageHide);
this.eventBus._on("updateviewarea", this.#updateViewarea.bind(this), {
signal,
});
window.addEventListener("popstate", this.#popState.bind(this), { signal });
window.addEventListener("pagehide", this.#pageHide.bind(this), { signal });
}
#unbindEvents() {
if (!this._boundEvents) {
return; // The event listeners were already removed.
}
this.eventBus._off("updateviewarea", this._boundEvents.updateViewarea);
window.removeEventListener("popstate", this._boundEvents.popState);
window.removeEventListener("pagehide", this._boundEvents.pageHide);
this._boundEvents = null;
this.#eventAbortController?.abort();
this.#eventAbortController = null;
}
}