I closed the issue for now since I mixed up swipe and drag events when thinking about this.

Affected hardware version

Bangle 2

Your firmware version

2v17.106

The bug

Tapping the Light Switch Widget and then draging changes the brightness like it should, but the swipe handler of quick launcher is also triggered which ideally wouldn't happen.

To fix this I've tried to make use of the new function E.stopEventPropagation() introduced in espruino/Espruino@35c8cb9 but I can't manage to make Light Switch Widget stop Quick Launcher from acting also, or vice versa.

I added E.stopEventPropagation(); inside the dragListener function
in Light Switch Widget here and inside the swipe handler in Quick Launcher here. But neither try stopped the other app from executing.

From the documentation:

When using events with X.on('foo', function() { ... })
and then X.emit('foo') you might want to stop subsequent
event handlers from being executed.
Calling this function doing the execution of events will
ensure that no subsequent event handlers are executed.

var X = {}; // in Espruino all objects are EventEmitters
X.on('foo', function() { print("A"); })
X.on('foo', function() { print("B"); E.stopEventPropagation(); })
X.on('foo', function() { print("C"); })
X.emit('foo');
// prints A,B but not C

First mentioned in #2743:

Actually no need - I've just implemented option 3 in 35c8cb9be11ce76ea1829a4a8b40f2ab051bb60b in the Espruino repo.

So you just need:

E.stopEventPropagation&&E.stopEventPropagation();

And that should do it I hope, while being backwards compatible.

Originally posted by @gfwilliams in #2743 (comment)

Installed apps

notify (0.12)
podadrem (0.07)
spotrem (0.07)
android (0.23)
lightswitch (0.06)
widanclk (0.02)
backswipe (0.02)
torch (0.11)
calculator (0.07)
agenda (0.13)
smpltmr (0.07)
kbmulti (0.05)
widram (0.03)
widbthide (0.01)
messageicons (0.05)
boot (0.57)
runplus (0.18)
dtlaunch (0.23)
alarm (0.41)
hrmmar (0.02)
taglaunch (0.03)
swscroll (0.03)
messagegui (0.65)
longpressbuzz (0.01)
bwclklite (0.33)
bwclk (0.32)
widmessages (0.05)
clkinfostopw (0.03)
recorder (0.23)
health (0.23)
quicklaunch (0.15)
polymath (0.01)
sched (0.22)
fastreset (0.01)
setting (0.60)
clock_info (0.03)
messages (0.59)
drained (0.03)
widminbat (0.03)
powermanager (0.10)
pebblepp (0.01)
fastload (0.04)