stable-diffusion-webui-ux/javascript/notification.js

// Monitors the gallery and sends a browser notification when the leading image is new.

let lastHeadImg = null;

let notificationButton = null;

onUiUpdate(function () {
  if (notificationButton == null) {
    notificationButton = gradioApp().getElementById("request_notifications");

    if (notificationButton != null) {
      notificationButton.addEventListener(
        "click",
        () => {
          void Notification.requestPermission();
        },
        true
      );
    }
  }

  const galleryPreviews = gradioApp().querySelectorAll(
    'div[id^="tab_"][style*="display: block"] div[id$="_results"] .thumbnail-item > img'
  );

  if (galleryPreviews == null) return;

  const headImg = galleryPreviews[0]?.src;

  if (headImg == null || headImg == lastHeadImg) return;

  lastHeadImg = headImg;

  // play notification sound if available
  gradioApp().querySelector("#audio_notification audio")?.play();

  if (document.hasFocus()) return;

  // Multiple copies of the images are in the DOM when one is selected. Dedup with a Set to get the real number generated.
  const imgs = new Set(Array.from(galleryPreviews).map((img) => img.src));

  const notification = new Notification("Stable Diffusion", {
    body: `Generated ${imgs.size > 1 ? imgs.size - opts.return_grid : 1} image${
      imgs.size > 1 ? "s" : ""
    }`,
    icon: headImg,
    image: headImg,
  });

  notification.onclick = function (_) {
    parent.focus();
    this.close();
  };
});