text: #include "../lv_examples.h"
  #if LV_USE_BTN && LV_BUILD_EXAMPLES
  
  static lv_style_t style_btn;
  static lv_style_t style_btn_pressed;
  static lv_style_t style_btn_red;
  
  static lv_color_t darken(const lv_color_filter_dsc_t * dsc, lv_color_t color, lv_opa_t opa)
  {
      LV_UNUSED(dsc);
      return lv_color_darken(color, opa);
  }
  
  static void style_init(void)
  {
      /*Create a simple button style*/
      lv_style_init(&style_btn);
      lv_style_set_radius(&style_btn, 10);
      lv_style_set_bg_opa(&style_btn, LV_OPA_COVER);
      lv_style_set_bg_color(&style_btn, lv_palette_lighten(LV_PALETTE_GREY, 3));
      lv_style_set_bg_grad_color(&style_btn, lv_palette_main(LV_PALETTE_GREY));
      lv_style_set_bg_grad_dir(&style_btn, LV_GRAD_DIR_VER);
  
      lv_style_set_border_color(&style_btn, lv_color_black());
      lv_style_set_border_opa(&style_btn, LV_OPA_20);
      lv_style_set_border_width(&style_btn, 2);
  
      lv_style_set_text_color(&style_btn, lv_color_black());
  
      /*Create a style for the pressed state.
       *Use a color filter to simply modify all colors in this state*/
      static lv_color_filter_dsc_t color_filter;
      lv_color_filter_dsc_init(&color_filter, darken);
      lv_style_init(&style_btn_pressed);
      lv_style_set_color_filter_dsc(&style_btn_pressed, &color_filter);
      lv_style_set_color_filter_opa(&style_btn_pressed, LV_OPA_20);
  
      /*Create a red style. Change only some colors.*/
      lv_style_init(&style_btn_red);
      lv_style_set_bg_color(&style_btn_red, lv_palette_main(LV_PALETTE_RED));
      lv_style_set_bg_grad_color(&style_btn_red, lv_palette_lighten(LV_PALETTE_RED, 3));
  }
  
  /**
   * Create styles from scratch for buttons.
   */
  void lv_example_get_started_2(void)
  {
      /*Initialize the style*/
      style_init();
  
      /*Create a button and use the new styles*/
      lv_obj_t * btn = lv_btn_create(lv_scr_act());
      /* Remove the styles coming from the theme
       * Note that size and position are also stored as style properties
       * so lv_obj_remove_style_all will remove the set size and position too */
      lv_obj_remove_style_all(btn);
      lv_obj_set_pos(btn, 10, 10);
      lv_obj_set_size(btn, 120, 50);
      lv_obj_add_style(btn, &style_btn, 0);
      lv_obj_add_style(btn, &style_btn_pressed, LV_STATE_PRESSED);
  
      /*Add a label to the button*/
      lv_obj_t * label = lv_label_create(btn);
      lv_label_set_text(label, "Button");
      lv_obj_center(label);
  
      /*Create another button and use the red style too*/
      lv_obj_t * btn2 = lv_btn_create(lv_scr_act());
      lv_obj_remove_style_all(btn2);                      /*Remove the styles coming from the theme*/
      lv_obj_set_pos(btn2, 10, 80);
      lv_obj_set_size(btn2, 120, 50);
      lv_obj_add_style(btn2, &style_btn, 0);
      lv_obj_add_style(btn2, &style_btn_red, 0);
      lv_obj_add_style(btn2, &style_btn_pressed, LV_STATE_PRESSED);
      lv_obj_set_style_radius(btn2, LV_RADIUS_CIRCLE, 0); /*Add a local style too*/
  
      label = lv_label_create(btn2);
      lv_label_set_text(label, "Button 2");
      lv_obj_center(label);
  }
  
  #endif
  