Problem with Hidden flag

How-to
1

Hello :slight_smile:

I’m a beginner in LVGL and I try to hide or show some pictures on the screen.

I tried:

        lv_obj_set_flag(ui_CmpON,LV_OBJ_FLAG_HIDDEN,true);
        lv_obj_set_flag(ui_NoState,LV_OBJ_FLAG_HIDDEN,true);
        lv_obj_set_flag(ui_CmpOff,LV_OBJ_FLAG_HIDDEN,false);

but this is not compiling…
so I’ve added:

  //add flags
  lv_obj_add_flag(ui_CmpOff,LV_OBJ_FLAG_HIDDEN);
  lv_obj_add_flag(ui_CmpON,LV_OBJ_FLAG_HIDDEN);
  lv_obj_add_flag(ui_NoState,LV_OBJ_FLAG_HIDDEN);

in the setup but same problem…
this is the error that I get:

src/ecran_clim.cpp:194:9: note: suggested alternative: ‘lv_obj_has_flag’
lv_obj_set_flag(ui_CmpON,LV_OBJ_FLAG_HIDDEN,true);
^~~~~~~~~~~~~~~
lv_obj_has_flag
*** [.pio\build\esp32dev\src\ecran_clim.cpp.o] Error 1

I read the manual and they said:

Blockquote

Flags

There are some attributes which can be enabled/disabled by lv_obj_add/remove_flag(obj, LV_OBJ_FLAG_...) and lv_obj_set_flag(obj, LV_OBJ_FLAG_..., true/false)

Blockquote

But it doesn’t seems to be working…
Is someone can help??
Thank you for your time and your help

2

Based on your ui_ seems you use Squareline. Here you can set hidden flag by click. And Syntax for cmds is based on versions lvgl 7 differ to 8 and now 9 is unsuported in SQS.
You dont show error for right syntx8 lv_obj_add_flag(

3 
void lv_obj_set_hidden(lv_obj_t* obj, bool en){
#if LVGL_VERSION_MAJOR == 9
  (en)? lv_obj_add_flag(obj, LV_OBJ_FLAG_HIDDEN) : lv_obj_remove_flag(obj, LV_OBJ_FLAG_HIDDEN);
#elif LVGL_VERSION_MAJOR == 8
  (en)? lv_obj_add_flag(obj, LV_OBJ_FLAG_HIDDEN) : lv_obj_clear_flag(obj, LV_OBJ_FLAG_HIDDEN);
#endif
}

bool lv_obj_get_hidden(lv_obj_t* obj){
  return lv_obj_has_flag(obj, LV_OBJ_FLAG_HIDDEN);
}
1 Like
4

Hi Marian, Yes, I’m using Squareline (fantastic program)…
Yes, no error on lv_obj_add_flag( but it doesn’t compile with : lv_obj_set_flag(ui_CmpON,LV_OBJ_FLAG_HIDDEN,true);

I will try the solution of @TridentTD and let you know.
Thank you for your help.

5

Thank you @TridentTD it works as expected. Short answer, extremely precise and totally correct as usual.
You’re really good Triden.

I can put only one heart on your answer but i will happily put 2 or 3 if I could :slight_smile:

Thank you again for your help and your time…

I’m living in Thailand and it’s SongKran day today… this is a new year Thai. So, Happy new year Tritent.

Have a lovely day.

6

Happy Songkran, Thailand’s New Year Water Festival!
It’s scorching hot in Thailand now,
but refreshing splashes of water make it cool.

Let’s celebrate!

1 Like
7

You seems to know what you’re talking about :blush:…
Yes, funny time, really hot, around 35 C but feel like 45… :face_with_spiral_eyes:

But anyway, we will celebrate :partying_face: