BangleApps/apps/widlockunlock/widget.js

WIDGETS["lockunlock"] = {
  area: (() => {
    const settings = require("Storage")
        .readJSON("lockunlock.settings.json", true) || {};
    return settings.location || "tl";
  })(),
  sortorder: 10,
  width: 14,
  draw: w => {
    g.reset()
      .drawImage(
        atob(Bangle.isLocked()
        ? "DBGBAAAA8DnDDCBCBP////////n/n/n//////z/A"
        : "DBGBAAAA8BnDDCBABP///8A8A8Y8Y8Y8A8A//z/A"),
        w.x + 1,
        w.y + 3
      );
  },
};
Bangle.on("lock", () => Bangle.drawWidgets());

Bangle.on('touch', (_btn, xy) => {
  const oversize = 5;

  const w = WIDGETS.lockunlock;

  const x = xy.x;
  const y = xy.y;

  if(w.x - oversize <= x && x < w.x + 14 + oversize
  && w.y - oversize <= y && y < w.y + 24 + oversize)
  {
    Bangle.setLocked(true);

    const backlightTimeout = Bangle.getOptions().backlightTimeout; // ms

    // seems to be a race/if we don't give the firmware enough time,
    // it won't timeout the backlight and we'll restore it in our setTimeout below
    Bangle.setOptions({ backlightTimeout: 100 });

    setTimeout(() => {
      Bangle.setOptions({ backlightTimeout });
    }, 300);
  }
});