react-dnd-accessible-backend/dist/DragAnnouncer.js

An add-on backend for react-dnd that provides support for keyboards and screenreaders by default.

import { getDefaultAnnouncementMessages } from "./util/AnnouncementMessages";
// It's a little annoying to have to statically require this. We _could_ make
// it fully external and require consumers to provide it always, but ensuring
// that an announcer exists implicitly feels more appropriate. Most consumers
// likely won't override this, or will be overriding with the same library
// anyway.
import * as LiveAnnouncer from "@react-aria/live-announcer";
export default class DragAnnouncer {
    announcer;
    externalAnnouncer;
    getMessages;
    constructor({ getAnnouncementMessages, announcer } = {}) {
        this.getMessages = getAnnouncementMessages ?? getDefaultAnnouncementMessages;
        this.externalAnnouncer = false;
        if (announcer != null) {
            this.announcer = announcer;
            this.externalAnnouncer = true;
        }
        else {
            this.announcer = {
                announce: LiveAnnouncer.announce,
                clearAnnouncements: LiveAnnouncer.clearAnnouncer,
                destroy: LiveAnnouncer.destroyAnnouncer,
            };
        }
    }
    announce(message, assertiveness, timeout) {
        this.announcer.announce(message, assertiveness, timeout);
    }
    announceDrag(node, id) {
        if (node == null)
            return;
        this.announce(this.getMessages().pickedUpItem(id, node));
    }
    announceHover(node, id) {
        if (node == null)
            return;
        this.announce(this.getMessages().hoveredTarget(id, node));
    }
    announceDrop(node, id) {
        this.announce(this.getMessages().droppedItem(id, node));
    }
    announceCancel(node, id) {
        this.announce(this.getMessages().canceledDrag(id, node));
    }
    clear() {
        this.announcer.clearAnnouncements();
    }
    destroy() {
        // don't destroy an external announcer, since it is likely used outside of drag-and-drop
        if (!this.externalAnnouncer) {
            this.announcer.destroy?.();
        }
    }
}
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