fix(ui) - Fix layout size issue (#2961) and improve code readability.

[philmoz]

Fixes #2961

Summary of changes:

Add enum for the 'decorationSettings' bits to make the code more understandable.
Fix the size check in 'getMainZone'.

[raphaelcoeffic]

As a side remark: we've been discussing ditching the option to hide the top-bar to better differentiate from the full screen mode. I promised @JimB40 it would come with a simpler method for accessing the full screen mode (double tap?). What do you think?

[JimB40]

Good concept. :)
Then "full-scren" without any OS UI elements will serve as "App-Mode" -> LUA run as widget controls events.
Double tap will serve well when app has this preview mode in smaller widget area to go quickly in App-Mode

I'm getting more and more confirmations that during flight time users use main views 95% with rare need to go into OS settings. They have mainviews configured as multi area layout with widgets (values, outputs ets) or 1-area-fulscreen LUA app like iNav, Yappu, Toolbox, TBS Agent, ELRS widget, etc.
All is needed in this scenario is efficient switching between main views. Switching main-view via switch was very good step
Check my walkthrough @ 49:48 when I show widgets use https://youtu.be/Ojltq2rBifM

So if we can manage to switch on APP-mode once user switch to main-view with full screen app, we have more or less phone-like solution regarding apps & desktops (main-views)

[philmoz]

As a side remark: we've been discussing ditching the option to hide the top-bar to better differentiate from the full screen mode.

Wouldn't this potentially break user's existing model setups on their radios? E.G. you have a view configured without the top bar and then the top bar suddenly comes back with no way to switch it off.

I promised @JimB40 it would come with a simpler method for accessing the full screen mode (double tap?). What do you think?

Is there a double tap event in ETX? There does not appear to be one in LVGL.

[JimB40]

Is there a double tap event in ETX? There does not appear to be one in LVGL.

Not yet