Stop input events, use custom ones, then restore the original?

Hello awesome Banglers!
I have a couple of projects on the go, Hiding the widget bar in an overlay, and Pop up notifications in an overlay, both using Bangle.SetLCDOverlay. I'm having trouble with swipes and drags. I can set a new event handler to move the overlay, but the clock face or app underneath also reacts to the swipe or drag.

Is there a way to block or clear existing events, e.g. Bangle.on('swipe'...), use my custom swipe handler, then clear my custom handler and put the previous one back?

Is there a way to block or clear existing events,

Well, if apps use Bangle.setUI then the handlers are all stored: https://github.com/espruino/Espruino/blob/master/libs/js/banglejs/Bangle_setUI_Q3.js#L12-L31

So potentially you could find those, remove them and re-add them after... But there is no way of flagging that an event is handled and shouldn't be propagated at the moment. If there's a sensible way to do this I could maybe include this in the firmware though

In my sensortools I override the .on and .removeListener methods, but that is only for debugging purposes. I suspect too much overhead to do that in possibly multiple libs.
Maybe a fast low level function to get all listeners for specific event and a small module in js to handle storing/restoring them would work and be flexible enough.

You can get/set all the handlers pretty easily with E["#onfoo"] without, so yes a library to handle that would work pretty well

This seems to work (in the emulator at least):

function removeListeners(events) {
      saved = {};
      events.forEach(event=>{
          let listeners = Bangle['#on'+event];
          if (!listeners) return;
          saved[event] = listeners;
          Bangle.removeAllListeners(event);
      });
      return saved;
}
function restoreListeners(saved) {
      for (const event in saved) {
          let listeners = saved[event];
          if (typeof listeners !== 'object') listeners = [listeners];
          listeners.forEach(listener => Bangle.on(event, listener));
          delete saved[event];
      }
}


// disable event listeners
const eventsToRemove = ['touch','swipe','drag','stroke','tap','gesture','aiGesture'];
let saved = removeListeners(eventsToRemove);

// do Stuff

// when done:
restoreListeners(saved);

Fab, thanks @rigrig! Looks good, I'll give it a go.