Help resetting theme for Fast Loading

[elcste]

I'm working on adding some options to a clock app (my app loader). One is to have it follow the system theme, so I'm adding a setting to keep the current behavior of always using the dark theme. I changed the fixed colours to use g.theme.bg/g.theme.fg and added

if (settings.darkTheme) {
  g.setTheme({bg: "#000"});
  g.setTheme({fg: "#FFF"});
}

which seems to work fine.

The theme seems to reset to the system theme when loading a new app, but when opening the launcher by pressing the button (or Quick Launch) the launcher keeps the dark theme. I think this is due to Fast Loading?

Searching the BangleApps repo I tried to find what other apps are doing. I tried adding g.reset();

Bangle.setUI({
  mode: "clock",
  remove: function() {
    g.reset();
    Bangle.removeListener('lcdPower', updateState);
    Bangle.removeListener('lock', updateState);
    Bangle.removeListener('charging', draw);
    // We clear drawTimout after removing all listeners, because they can add one again
    if (drawTimeout) clearTimeout(drawTimeout);
    drawTimeout = undefined;
    require("widget_utils").show();
  }
});

but it didn't seem to do anything.

Other apps seem to save the original theme and then set back to that. I tried adding const origTheme = g.theme;

if (settings.darkTheme) {
  const origTheme = g.theme;
  g.setTheme({bg: "#000"});
  g.setTheme({fg: "#FFF"});
}

and if (settings.darkTheme) g.setTheme(origTheme);

Bangle.setUI({
  mode: "clock",
  remove: function() {
    if (settings.darkTheme) g.setTheme(origTheme);
   [...]

but this makes the clock app freeze when I try to open the launcher.

Thanks for any help!

[thyttan]

I'll try to take a look tomorrow.

Do you se any error messages in the Web IDE when the clock face freezes?

[thyttan]

Searching the BangleApps repo I tried to find what other apps are doing. I tried adding g.reset();

@gfwilliams should g.reset() restore the theme in the system settings? If not maybe we should add a note at https://www.espruino.com/ReferenceBANGLEJS2#l_Graphics_theme that theme is not reset.

@elcste I just tried the same thing you did with storing and resetting the theme in the remove function without issues. What launcher and what firmware version are you using?

[gfwilliams]

No, it shouldn't reset the theme. I'll add a note :)

[elcste]

@thyttan Thanks for taking a look. I think I got it working!

I had been using the emulator but hadn't connected the IDE to the watch – I had jumped right to loading from my Github-clone app loader.

I had put the const in the if block. Clearly I'm a very novice programmer, js or otherwise ;-)

[thyttan]

We're on the same road 😉