text: /**
   * @file lv_btnm.c
   *
   */
  
  /*********************
   *      INCLUDES
   *********************/
  #include "lv_btnm.h"
  #if USE_LV_BTNM != 0
  
  #include "../lv_core/lv_group.h"
  #include "../lv_draw/lv_draw.h"
  #include "../lv_core/lv_refr.h"
  #include "../lv_themes/lv_theme.h"
  #include "../lv_misc/lv_txt.h"
  #include "../lvcompat.h"
  
  /*********************
   *      DEFINES
   *********************/
  
  /**********************
   *      TYPEDEFS
   **********************/
  
  /**********************
   *  STATIC PROTOTYPES
   **********************/
  static lv_res_t lv_btnm_signal(lv_obj_t * btnm, lv_signal_t sign, void * param);
  static bool lv_btnm_design(lv_obj_t * btnm, const lv_area_t * mask, lv_design_mode_t mode);
  static uint8_t get_button_width(const char * btn_str);
  static bool button_is_hidden(const char * btn_str);
  static bool button_is_repeat_disabled(const char * btn_str);
  static bool button_is_inactive(const char * btn_str);
  const char * cut_ctrl_byte(const char * btn_str);
  static uint16_t get_button_from_point(lv_obj_t * btnm, lv_point_t * p);
  static uint16_t get_button_text(lv_obj_t * btnm, uint16_t btn_id);
  static void create_buttons(lv_obj_t * btnm, const char ** map);
  
  /**********************
   *  STATIC VARIABLES
   **********************/
  static const char * lv_btnm_def_map[] = {"Btn1", "Btn2", "Btn3", "\n",
                                           "\002Btn4", "Btn5", ""
                                          };
  
  static lv_design_func_t ancestor_design_f;
  static lv_signal_func_t ancestor_signal;
  
  /**********************
   *      MACROS
   **********************/
  
  /**********************
   *   GLOBAL FUNCTIONS
   **********************/
  
  /**
   * Create a button matrix objects
   * @param par pointer to an object, it will be the parent of the new button matrix
   * @param copy pointer to a button matrix object, if not NULL then the new object will be copied from it
   * @return pointer to the created button matrix
   */
  lv_obj_t * lv_btnm_create(lv_obj_t * par, const lv_obj_t * copy)
  {
      LV_LOG_TRACE("button matrix create started");
  
      /*Create the ancestor object*/
      lv_obj_t * new_btnm = lv_obj_create(par, copy);
      lv_mem_assert(new_btnm);
      if(new_btnm == NULL) return NULL;
  
      if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_btnm);
  
      /*Allocate the object type specific extended data*/
      lv_btnm_ext_t * ext = lv_obj_allocate_ext_attr(new_btnm, sizeof(lv_btnm_ext_t));
      lv_mem_assert(ext);
      if(ext == NULL) return NULL;
  
      ext->btn_cnt = 0;
      ext->btn_id_pr = LV_BTNM_PR_NONE;
      ext->btn_id_tgl = LV_BTNM_PR_NONE;
      ext->button_areas = NULL;
      ext->action = NULL;
      ext->map_p = NULL;
      ext->toggle = 0;
      ext->styles_btn[LV_BTN_STATE_REL] = &lv_style_btn_rel;
      ext->styles_btn[LV_BTN_STATE_PR] = &lv_style_btn_pr;
      ext->styles_btn[LV_BTN_STATE_TGL_REL] = &lv_style_btn_tgl_rel;
      ext->styles_btn[LV_BTN_STATE_TGL_PR] = &lv_style_btn_tgl_pr;
      ext->styles_btn[LV_BTN_STATE_INA] = &lv_style_btn_ina;
  
      if(ancestor_design_f == NULL) ancestor_design_f = lv_obj_get_design_func(new_btnm);
  
      lv_obj_set_signal_func(new_btnm, lv_btnm_signal);
      lv_obj_set_design_func(new_btnm, lv_btnm_design);
  
      /*Init the new button matrix object*/
      if(copy == NULL) {
          lv_obj_set_size(new_btnm, LV_HOR_RES / 2, LV_VER_RES / 4);
          lv_btnm_set_map(new_btnm, lv_btnm_def_map);
  
          /*Set the default styles*/
          lv_theme_t * th = lv_theme_get_current();
          if(th) {
              lv_btnm_set_style(new_btnm, LV_BTNM_STYLE_BG, th->btnm.bg);
              lv_btnm_set_style(new_btnm, LV_BTNM_STYLE_BTN_REL, th->btnm.btn.rel);
              lv_btnm_set_style(new_btnm, LV_BTNM_STYLE_BTN_PR, th->btnm.btn.pr);
              lv_btnm_set_style(new_btnm, LV_BTNM_STYLE_BTN_TGL_REL, th->btnm.btn.tgl_rel);
              lv_btnm_set_style(new_btnm, LV_BTNM_STYLE_BTN_TGL_PR, th->btnm.btn.tgl_pr);
              lv_btnm_set_style(new_btnm, LV_BTNM_STYLE_BTN_INA, th->btnm.btn.ina);
          } else {
              lv_obj_set_style(new_btnm, &lv_style_pretty);
          }
      }
      /*Copy an existing object*/
      else {
          lv_btnm_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
          memcpy(ext->styles_btn, copy_ext->styles_btn, sizeof(ext->styles_btn));
          ext->action = copy_ext->action;
          ext->toggle = copy_ext->toggle;
          ext->btn_id_tgl = copy_ext->btn_id_tgl;
          lv_btnm_set_map(new_btnm, lv_btnm_get_map(copy));
      }
  
      LV_LOG_INFO("button matrix created");
  
      return new_btnm;
  }
  
  /*=====================
   * Setter functions
   *====================*/
  
  /**
   * Set a new map. Buttons will be created/deleted according to the map.
   * @param btnm pointer to a button matrix object
   * @param map pointer a string array. The last string has to be: "".
   *            Use "\n" to begin a new line.
   *            The first byte can be a control data:
   *             - bit 7: always 1
   *             - bit 6: always 0
   *             - bit 5: inactive (disabled) (\24x)
   *             - bit 4: no repeat (on long press) (\22x)
   *             - bit 3: hidden (\21x)
   *             - bit 2..0: button relative width
   *             Example (practically use octal numbers): "\224abc": "abc" text with 4 width and no long press
   */
  void lv_btnm_set_map(lv_obj_t * btnm, const char ** map)
  {
      if(map == NULL) return;
  
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      ext->map_p = map;
  
      /*Analyze the map and create the required number of buttons*/
      create_buttons(btnm, map);
  
      /*Set size and positions of the buttons*/
      lv_style_t * style_bg = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BG);
      lv_coord_t max_w = lv_obj_get_width(btnm) - 2 * style_bg->body.padding.hor;
      lv_coord_t max_h = lv_obj_get_height(btnm) - 2 * style_bg->body.padding.ver;
      lv_coord_t act_y = style_bg->body.padding.ver;
  
      /*Count the lines to calculate button height*/
      uint8_t line_cnt = 1;
      uint8_t li;
      for(li = 0; (size_t) AsciiStrLen(map[li]) != 0; li++) {
          if((int) AsciiStrCmp(map[li], "\n") == 0) line_cnt ++;
      }
  
      lv_coord_t btn_h = max_h - ((line_cnt - 1) * style_bg->body.padding.inner);
      btn_h = btn_h / line_cnt;
      btn_h --;                              /*-1 because e.g. height = 100 means 101 pixels (0..100)*/
  
      /* Count the units and the buttons in a line
       * (A button can be 1,2,3... unit wide)*/
      uint16_t unit_cnt;      /*Number of units in a row*/
      uint16_t unit_act_cnt;  /*Number of units currently put in a row*/
      uint16_t btn_cnt;       /*Number of buttons in a row*/
      uint16_t i_tot = 0;     /*Act. index in the str map*/
      uint16_t btn_i = 0;     /*Act. index of button areas*/
      const char  ** map_p_tmp = map;
  
      /*Count the units and the buttons in a line*/
      while(1) {
          unit_cnt = 0;
          btn_cnt = 0;
          /*Count the buttons in a line*/
          while((int) AsciiStrCmp(map_p_tmp[btn_cnt], "\n") != 0 &&
                  (size_t) AsciiStrLen(map_p_tmp[btn_cnt]) != 0) { /*Check a line*/
              unit_cnt += get_button_width(map_p_tmp[btn_cnt]);
              btn_cnt ++;
          }
  
          /*Only deal with the non empty lines*/
          if(btn_cnt != 0) {
              /*Calculate the width of all units*/
              lv_coord_t all_unit_w = max_w - ((btn_cnt - 1) * style_bg->body.padding.inner);
  
              /*Set the button size and positions and set the texts*/
              uint16_t i;
              lv_coord_t act_x = style_bg->body.padding.hor;
              lv_coord_t act_unit_w;
              unit_act_cnt = 0;
              for(i = 0; i < btn_cnt; i++) {
                  /* one_unit_w = all_unit_w / unit_cnt
                   * act_unit_w = one_unit_w * button_width
                   * do this two operations but the multiply first to divide a greater number */
                  act_unit_w = (all_unit_w * get_button_width(map_p_tmp[i])) / unit_cnt;
                  act_unit_w --;                              /*-1 because e.g. width = 100 means 101 pixels (0..100)*/
  
                  /*Always recalculate act_x because of rounding errors */
                  act_x = (unit_act_cnt * all_unit_w) / unit_cnt + i * style_bg->body.padding.inner + style_bg->body.padding.hor;
  
                  /* Set the button's area.
                   * If inner padding is zero then use the prev. button x2 as x1 to avoid rounding errors*/
                  if(style_bg->body.padding.inner == 0 && act_x != style_bg->body.padding.hor) {
                      lv_area_set(&ext->button_areas[btn_i],  ext->button_areas[btn_i - 1].x2, act_y,
                                  act_x + act_unit_w, act_y + btn_h);
                  } else {
                      lv_area_set(&ext->button_areas[btn_i],  act_x, act_y,
                                  act_x + act_unit_w, act_y + btn_h);
                  }
  
                  unit_act_cnt += get_button_width(map_p_tmp[i]);
  
                  i_tot ++;
                  btn_i ++;
              }
          }
          act_y += btn_h + style_bg->body.padding.inner;
  
          /*If no vertical padding then make sure the last row is at the bottom of 'btnm'*/
          if(style_bg->body.padding.ver == 0  &&
                  act_y + btn_h * 2 > max_h) {         /*Last row?*/
              btn_h = max_h - act_y - 1;
          }
  
          if((size_t) AsciiStrLen(map_p_tmp[btn_cnt]) == 0) break; /*Break on end of map*/
          map_p_tmp = &map_p_tmp[btn_cnt + 1]; /*Set the map to the next line*/
          i_tot ++;   /*Skip the '\n'*/
      }
  
      lv_obj_invalidate(btnm);
  }
  
  /**
   * Set a new callback function for the buttons (It will be called when a button is released)
   * @param btnm: pointer to button matrix object
   * @param cb pointer to a callback function
   */
  void lv_btnm_set_action(lv_obj_t * btnm, lv_btnm_action_t action)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      ext->action = action;
  }
  
  /**
   * Enable or disable button toggling
   * @param btnm pointer to button matrix object
   * @param en true: enable toggling; false: disable toggling
   * @param id index of the currently toggled button (ignored if 'en' == false)
   */
  void lv_btnm_set_toggle(lv_obj_t * btnm, bool en, uint16_t id)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
  
      ext->toggle = en == false ? 0 : 1;
      if(ext->toggle != 0) {
          if(id >= ext->btn_cnt) id = ext->btn_cnt - 1;
          ext->btn_id_tgl = id;
      } else {
          ext->btn_id_tgl = LV_BTNM_PR_NONE;
      }
  
      lv_obj_invalidate(btnm);
  }
  
  /**
   * Set a style of a button matrix
   * @param btnm pointer to a button matrix object
   * @param type which style should be set
   * @param style pointer to a style
   */
  void lv_btnm_set_style(lv_obj_t * btnm, lv_btnm_style_t type, lv_style_t * style)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
  
      switch(type) {
          case LV_BTNM_STYLE_BG:
              lv_obj_set_style(btnm, style);
              break;
          case LV_BTNM_STYLE_BTN_REL:
              ext->styles_btn[LV_BTN_STATE_REL] = style;
              lv_obj_invalidate(btnm);
              break;
          case LV_BTNM_STYLE_BTN_PR:
              ext->styles_btn[LV_BTN_STATE_PR] = style;
              lv_obj_invalidate(btnm);
              break;
          case LV_BTNM_STYLE_BTN_TGL_REL:
              ext->styles_btn[LV_BTN_STATE_TGL_REL] = style;
              lv_obj_invalidate(btnm);
              break;
          case LV_BTNM_STYLE_BTN_TGL_PR:
              ext->styles_btn[LV_BTN_STATE_TGL_PR] = style;
              lv_obj_invalidate(btnm);
              break;
          case LV_BTNM_STYLE_BTN_INA:
              ext->styles_btn[LV_BTN_STATE_INA] = style;
              lv_obj_invalidate(btnm);
              break;
      }
  }
  
  /*=====================
   * Getter functions
   *====================*/
  
  /**
   * Get the current map of a button matrix
   * @param btnm pointer to a button matrix object
   * @return the current map
   */
  const char ** lv_btnm_get_map(const lv_obj_t * btnm)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      return ext->map_p;
  }
  
  /**
   * Get a the callback function of the buttons on a button matrix
   * @param btnm: pointer to button matrix object
   * @return pointer to the callback function
   */
  lv_btnm_action_t lv_btnm_get_action(const lv_obj_t * btnm)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      return ext->action;
  }
  
  /**
   * Get the toggled button
   * @param btnm pointer to button matrix object
   * @return  index of the currently toggled button (0: if unset)
   */
  uint16_t lv_btnm_get_toggled(const lv_obj_t * btnm)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
  
      if(ext->toggle == 0) return 0;
      else return ext->btn_id_tgl;
  }
  
  /**
   * Get a style of a button matrix
   * @param btnm pointer to a button matrix object
   * @param type which style should be get
   * @return style pointer to a style
   */
  lv_style_t * lv_btnm_get_style(const lv_obj_t * btnm, lv_btnm_style_t type)
  {
      lv_style_t * style = NULL;
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
  
      switch(type) {
          case LV_BTNM_STYLE_BG:
              style = lv_obj_get_style(btnm);
              break;
          case LV_BTNM_STYLE_BTN_REL:
              style = ext->styles_btn[LV_BTN_STATE_REL];
              break;
          case LV_BTNM_STYLE_BTN_PR:
              style = ext->styles_btn[LV_BTN_STATE_PR];
              break;
          case LV_BTNM_STYLE_BTN_TGL_REL:
              style = ext->styles_btn[LV_BTN_STATE_TGL_REL];
              break;
          case LV_BTNM_STYLE_BTN_TGL_PR:
              style = ext->styles_btn[LV_BTN_STATE_TGL_PR];
              break;
          case LV_BTNM_STYLE_BTN_INA:
              style = ext->styles_btn[LV_BTN_STATE_INA];
              break;
          default:
              style = NULL;
              break;
      }
  
      return style;
  }
  
  /**********************
   *   STATIC FUNCTIONS
   **********************/
  
  /**
   * Handle the drawing related tasks of the button matrixs
   * @param btnm pointer to a button matrix object
   * @param mask the object will be drawn only in this area
   * @param mode LV_DESIGN_COVER_CHK: only check if the object fully covers the 'mask_p' area
   *                                  (return 'true' if yes)
   *             LV_DESIGN_DRAW: draw the object (always return 'true')
   *             LV_DESIGN_DRAW_POST: drawing after every children are drawn
   * @param return true/false, depends on 'mode'
   */
  static bool lv_btnm_design(lv_obj_t * btnm, const lv_area_t * mask, lv_design_mode_t mode)
  {
      if(mode == LV_DESIGN_COVER_CHK) {
          return ancestor_design_f(btnm, mask, mode);
          /*Return false if the object is not covers the mask_p area*/
      }
      /*Draw the object*/
      else if(mode == LV_DESIGN_DRAW_MAIN) {
          ancestor_design_f(btnm, mask, mode);
  
          lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
          lv_style_t * bg_style = lv_obj_get_style(btnm);
          lv_style_t * btn_style;
          lv_opa_t opa_scale = lv_obj_get_opa_scale(btnm);
  
          lv_area_t area_btnm;
          lv_obj_get_coords(btnm, &area_btnm);
  
          lv_area_t area_tmp;
          lv_coord_t btn_w;
          lv_coord_t btn_h;
          bool border_mod = false;
  
          uint16_t btn_i = 0;
          uint16_t txt_i = 0;
          for(btn_i = 0; btn_i < ext->btn_cnt; btn_i ++, txt_i ++) {
              /*Search the next valid text in the map*/
              while((int) AsciiStrCmp(ext->map_p[txt_i], "\n") == 0) txt_i ++;
  
              /*Skip hidden buttons*/
              if(button_is_hidden(ext->map_p[txt_i])) continue;
  
              lv_area_copy(&area_tmp, &ext->button_areas[btn_i]);
              area_tmp.x1 += area_btnm.x1;
              area_tmp.y1 += area_btnm.y1;
              area_tmp.x2 += area_btnm.x1;
              area_tmp.y2 += area_btnm.y1;
  
              btn_w = lv_area_get_width(&area_tmp);
              btn_h = lv_area_get_height(&area_tmp);
  
              /*Load the style*/
              if(button_is_inactive(ext->map_p[txt_i])) btn_style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BTN_INA);
              else if(btn_i != ext->btn_id_pr && btn_i != ext->btn_id_tgl) btn_style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BTN_REL);
              else if(btn_i == ext->btn_id_pr && btn_i != ext->btn_id_tgl) btn_style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BTN_PR);
              else if(btn_i != ext->btn_id_pr && btn_i == ext->btn_id_tgl) btn_style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BTN_TGL_REL);
              else if(btn_i == ext->btn_id_pr && btn_i == ext->btn_id_tgl) btn_style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BTN_TGL_PR);
              else btn_style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BTN_REL);    /*Not possible option, just to be sure*/
  
              /*On the right buttons clear the border if only right borders are drawn*/
              if(ext->map_p[txt_i + 1][0] == '\0' || ext->map_p[txt_i + 1][0] == '\n') {
                  if(btn_style->body.border.part == LV_BORDER_RIGHT) {
                      btn_style->body.border.part  = LV_BORDER_NONE;
                      border_mod = true;
                  }
              }
  
              lv_draw_rect(&area_tmp, mask, btn_style, opa_scale);
  
              if(border_mod) {
                  border_mod = false;
                  btn_style->body.border.part = LV_BORDER_RIGHT;
              }
  
              /*Calculate the size of the text*/
              if(btn_style->glass) btn_style = bg_style;
              const lv_font_t * font = btn_style->text.font;
              lv_point_t txt_size;
              lv_txt_get_size(&txt_size, ext->map_p[txt_i], font,
                              btn_style->text.letter_space, btn_style->text.line_space,
                              lv_area_get_width(&area_btnm), LV_TXT_FLAG_NONE);
  
              area_tmp.x1 += (btn_w - txt_size.x) / 2;
              area_tmp.y1 += (btn_h - txt_size.y) / 2;
              area_tmp.x2 = area_tmp.x1 + txt_size.x;
              area_tmp.y2 = area_tmp.y1 + txt_size.y;
  
  
              lv_draw_label(&area_tmp, mask, btn_style, opa_scale,  ext->map_p[txt_i], LV_TXT_FLAG_NONE, NULL);
          }
      }
      return true;
  }
  
  /**
   * Signal function of the button matrix
   * @param btnm pointer to a button matrix object
   * @param sign a signal type from lv_signal_t enum
   * @param param pointer to a signal specific variable
   * @return LV_RES_OK: the object is not deleted in the function; LV_RES_INV: the object is deleted
   */
  static lv_res_t lv_btnm_signal(lv_obj_t * btnm, lv_signal_t sign, void * param)
  {
      lv_res_t res;
  
      /* Include the ancient signal function */
      res = ancestor_signal(btnm, sign, param);
      if(res != LV_RES_OK) return res;
  
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      lv_area_t btnm_area;
      lv_area_t btn_area;
      lv_point_t p;
      if(sign == LV_SIGNAL_CLEANUP) {
          lv_mem_free(ext->button_areas);
      } else if(sign == LV_SIGNAL_STYLE_CHG || sign == LV_SIGNAL_CORD_CHG) {
          lv_btnm_set_map(btnm, ext->map_p);
      } else if(sign == LV_SIGNAL_PRESSING) {
          uint16_t btn_pr;
          /*Search the pressed area*/
          lv_indev_get_point(param, &p);
          btn_pr = get_button_from_point(btnm, &p);
          /*Invalidate to old and the new areas*/;
          lv_obj_get_coords(btnm, &btnm_area);
          if(btn_pr != ext->btn_id_pr) {
              lv_indev_reset_lpr(param);
              if(ext->btn_id_pr != LV_BTNM_PR_NONE) {
                  lv_area_copy(&btn_area, &ext->button_areas[ext->btn_id_pr]);
                  btn_area.x1 += btnm_area.x1;
                  btn_area.y1 += btnm_area.y1;
                  btn_area.x2 += btnm_area.x1;
                  btn_area.y2 += btnm_area.y1;
                  lv_inv_area(&btn_area);
              }
              if(btn_pr != LV_BTNM_PR_NONE) {
                  lv_area_copy(&btn_area, &ext->button_areas[btn_pr]);
                  btn_area.x1 += btnm_area.x1;
                  btn_area.y1 += btnm_area.y1;
                  btn_area.x2 += btnm_area.x1;
                  btn_area.y2 += btnm_area.y1;
                  lv_inv_area(&btn_area);
              }
          }
  
          ext->btn_id_pr = btn_pr;
      }
  
      else if(sign == LV_SIGNAL_LONG_PRESS_REP) {
          if(ext->action && ext->btn_id_pr != LV_BTNM_PR_NONE) {
              uint16_t txt_i = get_button_text(btnm, ext->btn_id_pr);
              if(txt_i != LV_BTNM_PR_NONE) {
                  if(button_is_repeat_disabled(ext->map_p[txt_i]) == false &&
                          button_is_inactive(ext->map_p[txt_i]) == false) {
                      res = ext->action(btnm, cut_ctrl_byte(ext->map_p[txt_i]));
                  }
              }
          }
      } else if(sign == LV_SIGNAL_RELEASED) {
          if(ext->btn_id_pr != LV_BTNM_PR_NONE) {
              uint16_t txt_i = get_button_text(btnm, ext->btn_id_pr);
              if(button_is_inactive(ext->map_p[txt_i]) == false && txt_i != LV_BTNM_PR_NONE) {        /*Ignore the inactive buttons anf click between the buttons*/
                  if(ext->action) res = ext->action(btnm, cut_ctrl_byte(ext->map_p[txt_i]));
                  if(res == LV_RES_OK) {
  
  					/*Invalidate to old pressed area*/;
  					lv_obj_get_coords(btnm, &btnm_area);
  					lv_area_copy(&btn_area, &ext->button_areas[ext->btn_id_pr]);
  					btn_area.x1 += btnm_area.x1;
  					btn_area.y1 += btnm_area.y1;
  					btn_area.x2 += btnm_area.x1;
  					btn_area.y2 += btnm_area.y1;
  					lv_inv_area(&btn_area);
  
  					if(ext->toggle != 0) {
  						/*Invalidate to old toggled area*/;
  						lv_area_copy(&btn_area, &ext->button_areas[ext->btn_id_tgl]);
  						btn_area.x1 += btnm_area.x1;
  						btn_area.y1 += btnm_area.y1;
  						btn_area.x2 += btnm_area.x1;
  						btn_area.y2 += btnm_area.y1;
  						lv_inv_area(&btn_area);
  						ext->btn_id_tgl = ext->btn_id_pr;
  
  					}
  
  		#if USE_LV_GROUP
  					/*Leave the clicked button as pressed if this the focused object in a group*/
  					lv_group_t * g = lv_obj_get_group(btnm);
  					if(lv_group_get_focused(g) != btnm) {
  						ext->btn_id_pr = LV_BTNM_PR_NONE;
  					}
  		#else
  					ext->btn_id_pr = LV_BTNM_PR_NONE;
  		#endif
  
  				}
              }
          }
      } else if(sign == LV_SIGNAL_PRESS_LOST || sign == LV_SIGNAL_DEFOCUS) {
          ext->btn_id_pr = LV_BTNM_PR_NONE;
          lv_obj_invalidate(btnm);
      } else if(sign == LV_SIGNAL_FOCUS) {
  #if USE_LV_GROUP
          lv_indev_t * indev = lv_indev_get_act();
          lv_hal_indev_type_t indev_type = lv_indev_get_type(indev);
          if(indev_type == LV_INDEV_TYPE_POINTER) {
              /*Select the clicked button*/
              lv_point_t p1;
              lv_indev_get_point(indev, &p1);
              uint16_t btn_i = get_button_from_point(btnm, &p1);
              ext->btn_id_pr = btn_i;
          } else  if(indev_type == LV_INDEV_TYPE_ENCODER) {
              /*In navigation mode don't select any button but in edit mode select the fist*/
              if(lv_group_get_editing(lv_obj_get_group(btnm))) ext->btn_id_pr = 0;
              else ext->btn_id_pr = LV_BTNM_PR_NONE;
          } else {
              ext->btn_id_pr = 0;
          }
  #else
          ext->btn_id_pr = 0;
  #endif
          lv_obj_invalidate(btnm);
      } else if(sign == LV_SIGNAL_CONTROLL) {
          char c = *((char *)param);
          if(c == LV_GROUP_KEY_RIGHT) {
              if(ext->btn_id_pr  == LV_BTNM_PR_NONE) ext->btn_id_pr = 0;
              else ext->btn_id_pr++;
              if(ext->btn_id_pr >= ext->btn_cnt - 1) ext->btn_id_pr = ext->btn_cnt - 1;
              lv_obj_invalidate(btnm);
          } else if(c == LV_GROUP_KEY_LEFT) {
              if(ext->btn_id_pr  == LV_BTNM_PR_NONE) ext->btn_id_pr = 0;
              if(ext->btn_id_pr > 0) ext->btn_id_pr--;
              lv_obj_invalidate(btnm);
          } else if(c == LV_GROUP_KEY_DOWN) {
              lv_style_t * style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BG);
              /*Find the area below the the current*/
              if(ext->btn_id_pr  == LV_BTNM_PR_NONE) {
                  ext->btn_id_pr = 0;
              } else {
                  uint16_t area_below;
                  lv_coord_t pr_center = ext->button_areas[ext->btn_id_pr].x1 + (lv_area_get_width(&ext->button_areas[ext->btn_id_pr]) >> 1);
  
                  for(area_below = ext->btn_id_pr; area_below < ext->btn_cnt; area_below ++) {
                      if(ext->button_areas[area_below].y1 >  ext->button_areas[ext->btn_id_pr].y1 &&
                              pr_center >=  ext->button_areas[area_below].x1 &&
                              pr_center <=  ext->button_areas[area_below].x2 + style->body.padding.hor) {
                          break;
                      }
                  }
  
                  if(area_below < ext->btn_cnt) ext->btn_id_pr = area_below;
              }
              lv_obj_invalidate(btnm);
          } else if(c == LV_GROUP_KEY_UP) {
              lv_style_t * style = lv_btnm_get_style(btnm, LV_BTNM_STYLE_BG);
              /*Find the area below the the current*/
              if(ext->btn_id_pr  == LV_BTNM_PR_NONE) {
                  ext->btn_id_pr = 0;
              } else {
                  int16_t area_above;
                  lv_coord_t pr_center = ext->button_areas[ext->btn_id_pr].x1 + (lv_area_get_width(&ext->button_areas[ext->btn_id_pr]) >> 1);
  
                  for(area_above = ext->btn_id_pr; area_above >= 0; area_above --) {
                      if(ext->button_areas[area_above].y1 < ext->button_areas[ext->btn_id_pr].y1 &&
                              pr_center >=  ext->button_areas[area_above].x1 - style->body.padding.hor &&
                              pr_center <=  ext->button_areas[area_above].x2) {
                          break;
                      }
                  }
                  if(area_above >= 0) ext->btn_id_pr = area_above;
  
              }
              lv_obj_invalidate(btnm);
          } else if(c == LV_GROUP_KEY_ENTER) {
              if(ext->action != NULL) {
                  uint16_t txt_i = get_button_text(btnm, ext->btn_id_pr);
                  if(txt_i != LV_BTNM_PR_NONE) {
                      res = ext->action(btnm, cut_ctrl_byte(ext->map_p[txt_i]));
                  }
              }
          }
      } else if(sign == LV_SIGNAL_GET_EDITABLE) {
          bool * editable = (bool *)param;
          *editable = true;
      } else if(sign == LV_SIGNAL_GET_TYPE) {
          lv_obj_type_t * buf = param;
          uint8_t i;
          for(i = 0; i < LV_MAX_ANCESTOR_NUM - 1; i++) {  /*Find the last set data*/
              if(buf->type[i] == NULL) break;
          }
          buf->type[i] = "lv_btnm";
      }
  
  
      return res;
  }
  
  /**
   * Create the required number of buttons according to a map
   * @param btnm pointer to button matrix object
   * @param map_p pointer to a string array
   */
  static void create_buttons(lv_obj_t * btnm, const char ** map)
  {
      /*Count the buttons in the map*/
      uint16_t btn_cnt = 0;
      uint16_t i = 0;
      while((size_t) AsciiStrLen(map[i]) != 0) {
          if((int) AsciiStrCmp(map[i], "\n") != 0) { /*Do not count line breaks*/
              btn_cnt ++;
          }
          i++;
      }
  
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
  
      if(ext->button_areas != NULL) {
          lv_mem_free(ext->button_areas);
          ext->button_areas = NULL;
      }
  
      ext->button_areas = lv_mem_alloc(sizeof(lv_area_t) * btn_cnt);
      lv_mem_assert(ext->button_areas);
      if(ext->button_areas == NULL) btn_cnt = 0;
  
      ext->btn_cnt = btn_cnt;
  }
  
  /**
   * Get the width of a button in units. It comes from the first "letter".
   * @param btn_str The descriptor string of a button. E.g. "apple" or "\004banana"
   * @return the width of the button in units
   */
  static uint8_t get_button_width(const char * btn_str)
  {
      if((btn_str[0] & LV_BTNM_CTRL_MASK) == LV_BTNM_CTRL_CODE) {
          return btn_str[0] & LV_BTNM_WIDTH_MASK;
      }
  
      return 1;   /*Default width is 1*/
  }
  
  static bool button_is_hidden(const char * btn_str)
  {
      /*If control byte presents and hidden bit is '1' then the button is hidden*/
      if(((btn_str[0] & LV_BTNM_CTRL_MASK) == LV_BTNM_CTRL_CODE) &&
              (btn_str[0] & LV_BTNM_HIDE_MASK)) {
          return true;
      }
  
      return false;
  }
  
  static bool button_is_repeat_disabled(const char * btn_str)
  {
      /*If control byte presents and hidden bit is '1' then the button is hidden*/
      if(((btn_str[0] & LV_BTNM_CTRL_MASK) == LV_BTNM_CTRL_CODE) &&
              (btn_str[0] & LV_BTNM_REPEAT_DISABLE_MASK)) {
          return true;
      }
  
      return false;
  }
  
  static bool button_is_inactive(const char * btn_str)
  {
      /*If control byte presents and hidden bit is '1' then the button is hidden*/
      if(((btn_str[0] & LV_BTNM_CTRL_MASK) == LV_BTNM_CTRL_CODE) &&
              (btn_str[0] & LV_BTNM_INACTIVE_MASK)) {
          return true;
      }
  
      return false;
  }
  
  
  const char * cut_ctrl_byte(const char * btn_str)
  {
      /*Cut the control byte if present*/
      if((btn_str[0] & LV_BTNM_CTRL_MASK) == LV_BTNM_CTRL_CODE) return &btn_str[1];
      else return btn_str;
  }
  
  /**
   * Gives the button id of a button under a given point
   * @param btnm pointer to a button matrix object
   * @param p a point with absolute coordinates
   * @return the id of the button or LV_BTNM_PR_NONE.
   */
  static uint16_t get_button_from_point(lv_obj_t * btnm, lv_point_t * p)
  {
      lv_area_t btnm_cords;
      lv_area_t btn_area;
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      uint16_t i;
      lv_obj_get_coords(btnm, &btnm_cords);
  
      for(i = 0; i < ext->btn_cnt; i++) {
          lv_area_copy(&btn_area, &ext->button_areas[i]);
          btn_area.x1 += btnm_cords.x1;
          btn_area.y1 += btnm_cords.y1;
          btn_area.x2 += btnm_cords.x1;
          btn_area.y2 += btnm_cords.y1;
          if(lv_area_is_point_on(&btn_area, p) != false) {
              break;
          }
      }
  
      if(i == ext->btn_cnt) i = LV_BTNM_PR_NONE;
  
      return i;
  }
  
  /**
   * Get the text of a button
   * @param btnm pointer to a button matrix object
   * @param btn_id button id
   * @return text id in ext->map_p or LV_BTNM_PR_NONE if 'btn_id' was invalid
   */
  static uint16_t get_button_text(lv_obj_t * btnm, uint16_t btn_id)
  {
      lv_btnm_ext_t * ext = lv_obj_get_ext_attr(btnm);
      if(btn_id > ext->btn_cnt) return LV_BTNM_PR_NONE;
  
      uint16_t txt_i = 0;
      uint16_t btn_i = 0;
  
      /* Search the text of ext->btn_pr the buttons text in the map
       * Skip "\n"-s*/
      while(btn_i != btn_id) {
          btn_i ++;
          txt_i ++;
          if((int) AsciiStrCmp(ext->map_p[txt_i], "\n") == 0) txt_i ++;
      }
  
      if(btn_i == ext->btn_cnt) return  LV_BTNM_PR_NONE;
  
      return txt_i;
  }
  
  
  #endif
  