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41 changes: 41 additions & 0 deletions web/src/elements/utils/listenerController.ts
Original file line number Diff line number Diff line change
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// This is a more modern way to handle disconnecting listeners on demand.

// example usage:

/*
export class MyElement extends LitElement {

this.listenerController = new ListenerController();

connectedCallback() {
super.connectedCallback();
window.addEventListener("event-1", handler1, { signal: this.listenerController.signal });
window.addEventListener("event-2", handler2, { signal: this.listenerController.signal });
window.addEventListener("event-3", handler3, { signal: this.listenerController.signal });
}

disconnectedCallback() {
// This will disconnect *all* the event listeners at once, and resets the listenerController,
// releasing the memory used for the signal as well. No more trying to map all the
// `addEventListener` to `removeEventListener` tediousness!
this.listenerController.abort();
super.disconnectedCallback();
}
}
*/

export class ListenerController {
listenerController?: AbortController;

get signal() {
if (!this.listenerController) {
this.listenerController = new AbortController();
}
return this.listenerController.signal;
}

abort() {
this.listenerController?.abort();
this.listenerController = undefined;
}
}
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