How to use example style to another project

How-to
1

example i want to use container syle to lvgl demo printer like this,
lv_theme_apply(cont, (lv_theme_style_t)LV_DEMO_PRINTER_THEME_ICON);

can I use the printer theme on my container? i was trying to copy the demo printer, and include it in my project but did not work , to use printer demo style
this my whole project

iam using esp32 with ili9313 320x240

2

I think the easiest way is to make a copy of lv_demo_ printer_theme.c, and then call xxx_ in your widgets file. call xxx_theme_init to initialize theme, using lv_theme_set_ act(th) to bind the topic. Just like the lv_demo_printer_theme.candlv_demo_printer` did.

In lv_demo_printer.c

    lv_theme_t * th = lv_demo_printer_theme_init(LV_COLOR_BLACK, LV_COLOR_BLACK,
            0, &lv_font_montserrat_14, &lv_font_montserrat_22,
            &lv_font_montserrat_28, &lv_font_montserrat_32);
    lv_theme_set_act(th);

It will set theme.apply_xcb to theme_apply which defined in theme file.

lv_theme_t * lv_demo_printer_theme_init(lv_color_t color_primary, lv_color_t color_secondary, uint32_t flags,
                                    const lv_font_t * font_small, const lv_font_t * font_normal, const lv_font_t * font_subtitle,
                                    const lv_font_t * font_title)
{
    theme.color_primary = color_primary;
    theme.color_secondary = color_secondary;
    theme.font_small = font_small;
    theme.font_normal = font_normal;
    theme.font_subtitle = font_subtitle;
    theme.font_title = font_title;
    theme.flags = flags;

    basic_init();

    theme.apply_xcb = theme_apply;

    return &theme;
}

After these settings, when you create and widget, it will find the corresponding style in theme_apply function and add it to existing style like this:

        case LV_THEME_CONT:
            lv_obj_clean_style_list(obj, LV_OBJ_PART_MAIN);
            list = lv_obj_get_style_list(obj, LV_CONT_PART_MAIN);
            _lv_style_list_add_style(list, &style_box);
            break;