text: #include "../lv_examples.h"
  #if LV_BUILD_EXAMPLES && LV_USE_IMG
  
  
  static lv_style_t style_btn;
  
  /*Will be called when the styles of the base theme are already added
    to add new styles*/
  static void new_theme_apply_cb(lv_theme_t * th, lv_obj_t * obj)
  {
      LV_UNUSED(th);
  
      if(lv_obj_check_type(obj, &lv_btn_class)) {
          lv_obj_add_style(obj, &style_btn, 0);
      }
  }
  
  static void new_theme_init_and_set(void)
  {
      /*Initialize the styles*/
      lv_style_init(&style_btn);
      lv_style_set_bg_color(&style_btn, lv_palette_main(LV_PALETTE_GREEN));
      lv_style_set_border_color(&style_btn, lv_palette_darken(LV_PALETTE_GREEN, 3));
      lv_style_set_border_width(&style_btn, 3);
  
      /*Initialize the new theme from the current theme*/
      lv_theme_t * th_act = lv_disp_get_theme(NULL);
      static lv_theme_t th_new;
      th_new = *th_act;
  
      /*Set the parent theme and the style apply callback for the new theme*/
      lv_theme_set_parent(&th_new, th_act);
      lv_theme_set_apply_cb(&th_new, new_theme_apply_cb);
  
      /*Assign the new theme to the current display*/
      lv_disp_set_theme(NULL, &th_new);
  }
  
  
  
  /**
   * Extending the current theme
   */
  void lv_example_style_14(void)
  {
      lv_obj_t * btn;
      lv_obj_t * label;
  
      btn = lv_btn_create(lv_scr_act());
      lv_obj_align(btn, LV_ALIGN_TOP_MID, 0, 20);
  
      label = lv_label_create(btn);
      lv_label_set_text(label, "Original theme");
  
      new_theme_init_and_set();
  
      btn = lv_btn_create(lv_scr_act());
      lv_obj_align(btn, LV_ALIGN_BOTTOM_MID, 0, -20);
  
      label = lv_label_create(btn);
      lv_label_set_text(label, "New theme");
  }
  
  #endif
  