Can't apply a style

How-to
1

:frowning: i everybody,
I’m trying to apply a style but it doesn’t work… What did I do wrong??
this is my code:

//style def
  static lv_style_t* stylTitle;
  lv_style_init(stylTitle);
//define the text and apply style
  lv_style_set_text_font(stylTitle,LV_FONT_MONTSERRAT_10);
  lv_label_set_text(label, BoatName.c_str());  // set label text
  lv_obj_add_style(label,stylTitle,0);
  lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 20);      // Center but 20 from the top

Without style, everything works fine, with style, the display is blinking white (nothing on it, just white blinking)

Display :WT32-SC01_V3.3
ESP32 Wronder (programmed as Expressif ESP32 DEVmodule
LVGL V8.3.11
IDE VS-platformIO

I’ve tried this but can’t compile in LVGL V8.3.11??

  static lv_style_t* stylTitle;
  lv_style_init(stylTitle);
  lv_style_set_text_font(stylTitle,LV_STATE_DEFAULT,&LV_FONT_MONTSERRAT_10);

LV_STATE_DEFAULT,&LV_FONT_MONTSERRAT_10 is not correct for the compiler. the function lv_style_set_text_font() seems to have only 2 arguments and not 3…

I’m stuck on character sizes since yesterday.:-(everything is working fine if I use lcd.setTextSize(3) and lcd.println() but it’s not a proper way to do it…
Thank you for your help.

2

Hello,

This bit:

  static lv_style_t* stylTitle;
  lv_style_init(stylTitle);
  lv_style_set_text_font(stylTitle,LV_STATE_DEFAULT,&LV_FONT_MONTSERRAT_10);

should be

  static lv_style_t stylTitle;
  lv_style_init(&stylTitle);
  lv_style_set_text_font(&stylTitle, LV_FONT_MONTSERRAT_10);

I am not sure if you need to use the font’s address. so perhaps it should be &LV_FONT_MONTSERRAT_10 here.
Let me know if it works!

3

Hi Tinus,
Thank you for your time and your answer…
Unfortunately, it doesn’t work (I’ve tried before and try again) but same result.

 //style def
  static lv_style_t stylTitle;
  lv_style_init(&stylTitle);
  lv_style_set_text_font(&stylTitle,LV_FONT_MONTSERRAT_10);
  lv_obj_t *label = lv_label_create(lv_scr_act()); // full screen as the parent
  lv_label_set_text(label, BoatName.c_str());  // set label text
  lv_obj_add_style(label,&stylTitle,0);
  lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 20);      // Center but 20 from the top

give exactly the same result. full white blinking display…

This is working but can’t increase the title:

 //style def
  //static lv_style_t stylTitle;
  //lv_style_init(&stylTitle);
  //lv_style_set_text_font(&stylTitle,LV_FONT_MONTSERRAT_10);
  lv_obj_t *label = lv_label_create(lv_scr_act()); // full screen as the parent
  lv_label_set_text(label, BoatName.c_str());  // set label text
  //lv_obj_add_style(label,&stylTitle,0);
  lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 20);      // Center but 20 from the top

I probably did something wrong but I can’t ffind what :frowning:

and &LV_FONT_MONTSERRAT_10 doesn’t compile :cry:

If you have another idea, just let me know and I will try again.
Thank you Tinus.

4 
lv_style_set_text_font(&stylTitle,&lv_font_montserrat_10);

change to the lower case font name.

1 Like
5

Hi Trident,
Thank you for your time and your answer.
Unfortunately,
lv_style_set_text_font(&stylTitle,&lv_font_montserrat_10);
doesn’t compile neither…

The error is:
src/main.cpp:80:38: error: ‘lv_font_montserrat_10’ was not declared in this scope
lv_style_set_text_font(&stylTitle,&lv_font_montserrat_10);

in the library, the font are declared in block letters so, it doesn’t work and this is not a surprise but I tried anyway…

Thank you Trident.

6

in the lv_conf.h

#define LV_FONT_MONTSERRAT_10     1
1 Like
7

Trident, BRAVO,
it’s working with:

  static lv_style_t stylTitle;
  lv_style_init(&stylTitle);
  lv_style_set_text_font(&stylTitle,&lv_font_montserrat_26);
  lv_obj_t *label = lv_label_create(lv_scr_act()); // full screen as the parent
  lv_label_set_text(label, BoatName.c_str());  // set label text
  lv_obj_add_style(label,&stylTitle,0);
  lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 20);      // Center but 20 from the top

You was right, in lower case with &…
Thank you so much Trident. and yes, need to modify the lv_conf.h.

Fantastic Trident. :slight_smile:
Thank you soooooo much.