text: /**
   * @file lv_btn.c
   *
   */
  
  /*********************
   *      INCLUDES
   *********************/
  
  #include "lv_btn.h"
  #if USE_LV_BTN != 0
  
  #include <string.h>
  #include "../lv_core/lv_group.h"
  #include "../lv_draw/lv_draw.h"
  #include "../lv_themes/lv_theme.h"
  #include "../lv_misc/lv_area.h"
  #include "../lv_misc/lv_color.h"
  #include "../lv_misc/lv_math.h"
  
  /*********************
   *      DEFINES
   *********************/
  #define LV_BTN_INK_VALUE_MAX            256
  #define LV_BTN_INK_VALUE_MAX_SHIFT      8
  
  /**********************
   *      TYPEDEFS
   **********************/
  
  /**********************
   *  STATIC PROTOTYPES
   **********************/
  static bool lv_btn_design(lv_obj_t * ddlist, const lv_area_t * mask, lv_design_mode_t mode);
  static lv_res_t lv_btn_signal(lv_obj_t * btn, lv_signal_t sign, void * param);
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
  static void lv_btn_ink_effect_anim(lv_obj_t * btn, int32_t val);
  static void lv_btn_ink_effect_anim_ready(void * p);
  #endif
  
  /**********************
   *  STATIC VARIABLES
   **********************/
  static lv_signal_func_t ancestor_signal;
  static lv_design_func_t ancestor_design;
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
  static lv_coord_t ink_act_value;
  static lv_obj_t * ink_obj;
  static lv_btn_state_t ink_bg_state;
  static lv_btn_state_t ink_top_state;
  static bool ink_ready;
  static bool ink_playback;
  static lv_point_t ink_point;
  #endif
  
  /**********************
   *      MACROS
   **********************/
  
  /**********************
   *   GLOBAL FUNCTIONS
   **********************/
  
  /**
   * Create a button objects
   * @param par pointer to an object, it will be the parent of the new button
   * @param copy pointer to a button object, if not NULL then the new object will be copied from it
   * @return pointer to the created button
   */
  lv_obj_t * lv_btn_create(lv_obj_t * par, const lv_obj_t * copy)
  {
      LV_LOG_TRACE("button create started");
  
      lv_obj_t * new_btn;
  
      new_btn = lv_cont_create(par, copy);
      lv_mem_assert(new_btn);
      if(new_btn == NULL) return NULL;
  
      if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_btn);
      if(ancestor_design == NULL) ancestor_design = lv_obj_get_design_func(new_btn);
  
      /*Allocate the extended data*/
      lv_btn_ext_t * ext = lv_obj_allocate_ext_attr(new_btn, sizeof(lv_btn_ext_t));
      lv_mem_assert(ext);
      if(ext == NULL) return NULL;
  
      ext->state = LV_BTN_STATE_REL;
  
      ext->actions[LV_BTN_ACTION_PR] = NULL;
      ext->actions[LV_BTN_ACTION_CLICK] = NULL;
      ext->actions[LV_BTN_ACTION_LONG_PR] = NULL;
      ext->actions[LV_BTN_ACTION_LONG_PR_REPEAT] = NULL;
  
      ext->styles[LV_BTN_STATE_REL] = &lv_style_btn_rel;
      ext->styles[LV_BTN_STATE_PR] = &lv_style_btn_pr;
      ext->styles[LV_BTN_STATE_TGL_REL] = &lv_style_btn_tgl_rel;
      ext->styles[LV_BTN_STATE_TGL_PR] = &lv_style_btn_tgl_pr;
      ext->styles[LV_BTN_STATE_INA] = &lv_style_btn_ina;
  
      ext->long_pr_action_executed = 0;
      ext->toggle = 0;
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      ext->ink_in_time = 0;
      ext->ink_wait_time = 0;
      ext->ink_out_time = 0;
  #endif
  
      lv_obj_set_signal_func(new_btn, lv_btn_signal);
      lv_obj_set_design_func(new_btn, lv_btn_design);
  
      /*If no copy do the basic initialization*/
      if(copy == NULL) {
          /*Set layout if the button is not a screen*/
          if(par != NULL) {
              lv_btn_set_layout(new_btn, LV_LAYOUT_CENTER);
          }
  
          lv_obj_set_click(new_btn, true);        /*Be sure the button is clickable*/
  
          /*Set the default styles*/
          lv_theme_t * th = lv_theme_get_current();
          if(th) {
              lv_btn_set_style(new_btn, LV_BTN_STYLE_REL, th->btn.rel);
              lv_btn_set_style(new_btn, LV_BTN_STYLE_PR, th->btn.pr);
              lv_btn_set_style(new_btn, LV_BTN_STYLE_TGL_REL, th->btn.tgl_rel);
              lv_btn_set_style(new_btn, LV_BTN_STYLE_TGL_PR, th->btn.tgl_pr);
              lv_btn_set_style(new_btn, LV_BTN_STYLE_INA, th->btn.ina);
          } else {
              lv_obj_set_style(new_btn, ext->styles[LV_BTN_STATE_REL]);
          }
      }
      /*Copy 'copy'*/
      else {
          lv_btn_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
          ext->state = copy_ext->state;
          ext->toggle = copy_ext->toggle;
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
          ext->ink_in_time = copy_ext->ink_in_time;
          ext->ink_wait_time = copy_ext->ink_wait_time;
          ext->ink_out_time = copy_ext->ink_out_time;
  #endif
          memcpy(ext->actions, copy_ext->actions, sizeof(ext->actions));
          memcpy(ext->styles, copy_ext->styles, sizeof(ext->styles));
  
          /*Refresh the style with new signal function*/
          lv_obj_refresh_style(new_btn);
      }
  
      LV_LOG_INFO("button created");
  
      return new_btn;
  }
  
  /*=====================
   * Setter functions
   *====================*/
  
  /**
   * Enable the toggled states
   * @param btn pointer to a button object
   * @param tgl true: enable toggled states, false: disable
   */
  void lv_btn_set_toggle(lv_obj_t * btn, bool tgl)
  {
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
  
      ext->toggle = tgl != false ? 1 : 0;
  }
  
  /**
   * Set the state of the button
   * @param btn pointer to a button object
   * @param state the new state of the button (from lv_btn_state_t enum)
   */
  void lv_btn_set_state(lv_obj_t * btn, lv_btn_state_t state)
  {
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      if(ext->state != state) {
          ext->state = state;
          lv_obj_set_style(btn, ext->styles[state]);
      }
  }
  
  /**
   * Toggle the state of the button (ON->OFF, OFF->ON)
   * @param btn pointer to a button object
   */
  void lv_btn_toggle(lv_obj_t * btn)
  {
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      switch(ext->state) {
          case LV_BTN_STATE_REL:
              lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
              break;
          case LV_BTN_STATE_PR:
              lv_btn_set_state(btn, LV_BTN_STATE_TGL_PR);
              break;
          case LV_BTN_STATE_TGL_REL:
              lv_btn_set_state(btn, LV_BTN_STATE_REL);
              break;
          case LV_BTN_STATE_TGL_PR:
              lv_btn_set_state(btn, LV_BTN_STATE_PR);
              break;
          default:
              break;
      }
  }
  
  /**
   * Set a function to call when a button event happens
   * @param btn pointer to a button object
   * @param action type of event form 'lv_action_t' (press, release, long press, long press repeat)
   */
  void lv_btn_set_action(lv_obj_t * btn, lv_btn_action_t type, lv_action_t action)
  {
      if(type >= LV_BTN_ACTION_NUM) return;
  
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      ext->actions[type] = action;
  }
  
  /**
   * Set time of the ink effect (draw a circle on click to animate in the new state)
   * @param btn pointer to a button object
   * @param time the time of the ink animation
   */
  void lv_btn_set_ink_in_time(lv_obj_t * btn, uint16_t time)
  {
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      ext->ink_in_time = time;
  #else
      (void)btn; /*Unused*/
      (void)time; /*Unused*/
      LV_LOG_WARN("`lv_btn_set_ink_ink_time` has no effect if LV_BTN_INK_EFEFCT or USE_LV_ANIMATION is disabled")
  #endif
  }
  
  /**
   * Set the wait time before the ink disappears
   * @param btn pointer to a button object
   * @param time the time of the ink animation
   */
  void lv_btn_set_ink_wait_time(lv_obj_t * btn, uint16_t time)
  {
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      ext->ink_wait_time = time;
  #else
      (void)btn; /*Unused*/
      (void)time; /*Unused*/
      LV_LOG_WARN("`lv_btn_set_ink_wait_time` has no effect if LV_BTN_INK_EFEFCT or USE_LV_ANIMATION is disabled")
  #endif
  }
  
  /**
   * Set time of the ink out effect (animate to the released state)
   * @param btn pointer to a button object
   * @param time the time of the ink animation
   */
  void lv_btn_set_ink_out_time(lv_obj_t * btn, uint16_t time)
  {
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      ext->ink_out_time = time;
  #else
      (void)btn; /*Unused*/
      (void)time; /*Unused*/
      LV_LOG_WARN("`lv_btn_set_ink_out_time` has no effect if LV_BTN_INK_EFEFCT or USE_LV_ANIMATION is disabled")
  #endif
  }
  
  /**
   * Set a style of a button
   * @param btn pointer to a button object
   * @param type which style should be set
   * @param style pointer to a style
   */
  void lv_btn_set_style(lv_obj_t * btn, lv_btn_style_t type, lv_style_t * style)
  {
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
  
      switch(type) {
          case LV_BTN_STYLE_REL:
              ext->styles[LV_BTN_STATE_REL] = style;
              break;
          case LV_BTN_STYLE_PR:
              ext->styles[LV_BTN_STATE_PR] = style;
              break;
          case LV_BTN_STYLE_TGL_REL:
              ext->styles[LV_BTN_STATE_TGL_REL] = style;
              break;
          case LV_BTN_STYLE_TGL_PR:
              ext->styles[LV_BTN_STATE_TGL_PR] = style;
              break;
          case LV_BTN_STYLE_INA:
              ext->styles[LV_BTN_STATE_INA] = style;
              break;
      }
  
      /*Refresh the object with the new style*/
      lv_obj_set_style(btn, ext->styles[ext->state]);
  }
  
  
  /*=====================
   * Getter functions
   *====================*/
  
  /**
   * Get the current state of the button
   * @param btn pointer to a button object
   * @return the state of the button (from lv_btn_state_t enum)
   */
  lv_btn_state_t lv_btn_get_state(const lv_obj_t * btn)
  {
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      return ext->state;
  }
  
  /**
   * Get the toggle enable attribute of the button
   * @param btn pointer to a button object
   * @return ture: toggle enabled, false: disabled
   */
  bool lv_btn_get_toggle(const lv_obj_t * btn)
  {
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
  
      return ext->toggle != 0 ? true : false;
  }
  
  /**
   * Get the release action of a button
   * @param btn pointer to a button object
   * @return pointer to the release action function
   */
  lv_action_t lv_btn_get_action(const lv_obj_t * btn, lv_btn_action_t type)
  {
      if(type >= LV_BTN_ACTION_NUM) return NULL;
  
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      return ext->actions[type];
  }
  
  /**
   * Get time of the ink in effect (draw a circle on click to animate in the new state)
   * @param btn pointer to a button object
   * @return the time of the ink animation
   */
  uint16_t lv_btn_get_ink_in_time(const lv_obj_t * btn)
  {
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      return ext->ink_in_time;
  #else
      (void)btn; /*Unused*/
      return 0;
  #endif
  }
  
  
  /**
   * Get the wait time before the ink disappears
   * @param btn pointer to a button object
   * @return the time of the ink animation
   */
  uint16_t lv_btn_get_ink_wait_time(const lv_obj_t * btn)
  {
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      return ext->ink_wait_time;
  #else
      (void)btn; /*Unused*/
      return 0;
  #endif
  }
  /**
   * Get time of the ink out effect (animate to the releases state)
   * @param btn pointer to a button object
   * @return the time of the ink animation
   */
  uint16_t lv_btn_get_ink_out_time(const lv_obj_t * btn)
  {
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      return ext->ink_in_time;
  #else
      (void)btn; /*Unused*/
      return 0;
  #endif
  }
  
  /**
   * Get a style of a button
   * @param btn pointer to a button object
   * @param type which style should be get
   * @return style pointer to a style
   */
  lv_style_t * lv_btn_get_style(const lv_obj_t * btn, lv_btn_style_t type)
  {
      lv_style_t * style = NULL;
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
  
      switch(type) {
          case LV_BTN_STYLE_REL:
              style = ext->styles[LV_BTN_STATE_REL];
              break;
          case LV_BTN_STYLE_PR:
              style = ext->styles[LV_BTN_STATE_PR];
              break;
          case LV_BTN_STYLE_TGL_REL:
              style = ext->styles[LV_BTN_STATE_TGL_REL];
              break;
          case LV_BTN_STYLE_TGL_PR:
              style = ext->styles[LV_BTN_STATE_TGL_PR];
              break;
          case LV_BTN_STYLE_INA:
              style = ext->styles[LV_BTN_STATE_INA];
              break;
          default:
              style = NULL;
              break;
      }
  
      return style;
  }
  
  /**********************
   *   STATIC FUNCTIONS
   **********************/
  
  
  /**
   * Handle the drawing related tasks of the drop down lists
   * @param btn pointer to an 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_btn_design(lv_obj_t * btn, const lv_area_t * mask, lv_design_mode_t mode)
  {
      if(mode == LV_DESIGN_COVER_CHK) {
          return false;
      } else if(mode == LV_DESIGN_DRAW_MAIN) {
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
          if(btn != ink_obj) {
              ancestor_design(btn, mask, mode);
          } else {
              lv_opa_t opa_scale = lv_obj_get_opa_scale(btn);
              lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
  
              /*Draw the normal button*/
              if(ink_playback == false) {
                  lv_style_t style_tmp;
                  lv_style_copy(&style_tmp, ext->styles[ink_bg_state]);
                  style_tmp.body.shadow.width = ext->styles[ink_top_state]->body.shadow.width;
                  lv_draw_rect(&btn->coords, mask, &style_tmp, opa_scale);
  
                  lv_coord_t w = lv_obj_get_width(btn);
                  lv_coord_t h = lv_obj_get_height(btn);
                  lv_coord_t r_max = LV_MATH_MIN(w, h) / 2;
  
                  /*In the first part of the animation increase the size of the circle (ink effect) */
                  lv_area_t cir_area;
  
                  lv_coord_t coord_state = ink_act_value < LV_BTN_INK_VALUE_MAX / 2 ? ink_act_value : LV_BTN_INK_VALUE_MAX / 2;
                  lv_point_t p_act;
                  p_act.x = ink_point.x;
                  p_act.y = ink_point.y;
                  lv_coord_t x_err = (btn->coords.x1 + w / 2) - p_act.x;
                  lv_coord_t y_err = (btn->coords.y1 + h / 2) - p_act.y;
  
                  p_act.x += (x_err * coord_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1);
                  p_act.y += (y_err * coord_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1);
  
                  lv_coord_t half_side = LV_MATH_MAX(w, h) / 2;
                  cir_area.x1 = p_act.x - ((half_side * coord_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1));
                  cir_area.y1 = p_act.y - ((half_side * coord_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1));
                  cir_area.x2 = p_act.x + ((half_side * coord_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1));
                  cir_area.y2 = p_act.y + ((half_side * coord_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1));
  
                  lv_area_intersect(&cir_area, &btn->coords, &cir_area);      /*Limit the area. (It might be too big on the smaller side)*/
  
                  /*In the second part animate the radius. Circle -> body.radius*/
                  lv_coord_t r_state = ink_act_value > LV_BTN_INK_VALUE_MAX / 2 ? ink_act_value - LV_BTN_INK_VALUE_MAX / 2 : 0;
  
                  lv_style_copy(&style_tmp, ext->styles[ink_top_state]);
                  style_tmp.body.radius = r_max + (((ext->styles[ink_bg_state]->body.radius - r_max) * r_state) >> (LV_BTN_INK_VALUE_MAX_SHIFT - 1));
                  style_tmp.body.border.width = 0;
  
                  /*Draw the circle*/
                  lv_draw_rect(&cir_area, mask, &style_tmp, opa_scale);
              } else {
                  lv_style_t res;
                  lv_style_copy(&res, ext->styles[ink_bg_state]);
                  lv_style_mix(ext->styles[ink_bg_state], ext->styles[ink_top_state], &res, ink_act_value);
                  lv_draw_rect(&btn->coords, mask, &res, opa_scale);
  
              }
          }
  #else
          ancestor_design(btn, mask, mode);
  #endif
      } else if(mode == LV_DESIGN_DRAW_POST) {
          ancestor_design(btn, mask, mode);
      }
  
      return true;
  }
  
  /**
   * Signal function of the button
   * @param btn pointer to a button 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_btn_signal(lv_obj_t * btn, lv_signal_t sign, void * param)
  {
      lv_res_t res;
  
      /* Include the ancient signal function */
      res = ancestor_signal(btn, sign, param);
      if(res != LV_RES_OK) return res;
  
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(btn);
      lv_btn_state_t state = lv_btn_get_state(btn);
      bool tgl = lv_btn_get_toggle(btn);
  
      if(sign == LV_SIGNAL_PRESSED) {
          /*Refresh the state*/
          if(ext->state == LV_BTN_STATE_REL) {
              lv_btn_set_state(btn, LV_BTN_STATE_PR);
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
              ink_bg_state = LV_BTN_STATE_REL;
              ink_top_state = LV_BTN_STATE_PR;
  #endif
          } else if(ext->state == LV_BTN_STATE_TGL_REL) {
              lv_btn_set_state(btn, LV_BTN_STATE_TGL_PR);
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
              ink_bg_state = LV_BTN_STATE_TGL_REL;
              ink_top_state = LV_BTN_STATE_TGL_PR;
  #endif
          }
  
          ext->long_pr_action_executed = 0;
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
          /*Forget the old inked button*/
          if(ink_obj != NULL && ink_obj != btn) {
              lv_anim_del(ink_obj, (lv_anim_fp_t)lv_btn_ink_effect_anim);
              lv_obj_invalidate(ink_obj);
              ink_obj = NULL;
          }
          /*Save the new data for inking and start it's animation if enabled*/
          if(ext->ink_in_time > 0) {
              ink_obj = btn;
              ink_playback = false;
              ink_ready = false;
              lv_indev_get_point(lv_indev_get_act(), &ink_point);
  
              lv_anim_t a;
              a.var = btn;
              a.start = 0;
              a.end = LV_BTN_INK_VALUE_MAX;
              a.fp = (lv_anim_fp_t)lv_btn_ink_effect_anim;
              a.path = lv_anim_path_linear;
              a.end_cb = lv_btn_ink_effect_anim_ready;
              a.act_time = 0;
              a.time = ext->ink_in_time;
              a.playback = 0;
              a.playback_pause = 0;
              a.repeat = 0;
              a.repeat_pause = 0;
              lv_anim_create(&a);
          }
  #endif
          /*Call the press action, 'param' is the caller indev_proc*/
          if(ext->actions[LV_BTN_ACTION_PR] && state != LV_BTN_STATE_INA) {
              res = ext->actions[LV_BTN_ACTION_PR](btn);
          }
      } else if(sign == LV_SIGNAL_PRESS_LOST) {
          /*Refresh the state*/
          if(ext->state == LV_BTN_STATE_PR) lv_btn_set_state(btn, LV_BTN_STATE_REL);
          else if(ext->state == LV_BTN_STATE_TGL_PR) lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
      } else if(sign == LV_SIGNAL_PRESSING) {
          /*When the button begins to drag revert pressed states to released*/
          if(lv_indev_is_dragging(param) != false) {
              if(ext->state == LV_BTN_STATE_PR) lv_btn_set_state(btn, LV_BTN_STATE_REL);
              else if(ext->state == LV_BTN_STATE_TGL_PR) lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
          }
      } else if(sign == LV_SIGNAL_RELEASED) {
          /*If not dragged and it was not long press action then
           *change state and run the action*/
          if(lv_indev_is_dragging(param) == false && ext->long_pr_action_executed == 0) {
              if(ext->state == LV_BTN_STATE_PR && tgl == false) {
                  lv_btn_set_state(btn, LV_BTN_STATE_REL);
              } else if(ext->state == LV_BTN_STATE_TGL_PR && tgl == false) {
                  lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
              } else if(ext->state == LV_BTN_STATE_PR && tgl == true) {
                  lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
              } else if(ext->state == LV_BTN_STATE_TGL_PR && tgl == true) {
                  lv_btn_set_state(btn, LV_BTN_STATE_REL);
              }
  
              if(ext->actions[LV_BTN_ACTION_CLICK] && state != LV_BTN_STATE_INA) {
                  res = ext->actions[LV_BTN_ACTION_CLICK](btn);
              }
          } else { /*If dragged change back the state*/
              if(ext->state == LV_BTN_STATE_PR) {
                  lv_btn_set_state(btn, LV_BTN_STATE_REL);
              } else if(ext->state == LV_BTN_STATE_TGL_PR) {
                  lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
              }
          }
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
          /*Draw the toggled state in the inking instead*/
          if(ext->toggle) {
              ink_top_state = ext->state;
          }
          /*If not a toggle button and the "IN" inking is ready then start an "OUT" inking*/
          else if(ink_ready && ext->ink_out_time > 0) {
              ink_obj = btn;
              ink_playback = true;    /*It is the playback. If not set `lv_btn_ink_effect_anim_ready` will start its own playback*/
              lv_indev_get_point(lv_indev_get_act(), &ink_point);
  
              lv_anim_t a;
              a.var = ink_obj;
              a.start = LV_BTN_INK_VALUE_MAX;
              a.end = 0;
              a.fp = (lv_anim_fp_t)lv_btn_ink_effect_anim;
              a.path = lv_anim_path_linear;
              a.end_cb = lv_btn_ink_effect_anim_ready;
              a.act_time = 0;
              a.time = ext->ink_out_time;
              a.playback = 0;
              a.playback_pause = 0;
              a.repeat = 0;
              a.repeat_pause = 0;
              lv_anim_create(&a);
          }
  #endif
      } else if(sign == LV_SIGNAL_LONG_PRESS) {
          if(ext->actions[LV_BTN_ACTION_LONG_PR] && state != LV_BTN_STATE_INA) {
              ext->long_pr_action_executed = 1;
              res = ext->actions[LV_BTN_ACTION_LONG_PR](btn);
          }
      } else if(sign == LV_SIGNAL_LONG_PRESS_REP) {
          if(ext->actions[LV_BTN_ACTION_LONG_PR_REPEAT] && state != LV_BTN_STATE_INA) {
              res = ext->actions[LV_BTN_ACTION_LONG_PR_REPEAT](btn);
          }
      } else if(sign == LV_SIGNAL_CONTROLL) {
          char c = *((char *)param);
          if(c == LV_GROUP_KEY_RIGHT || c == LV_GROUP_KEY_UP) {
              if(lv_btn_get_toggle(btn) != false) lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
              if(ext->actions[LV_BTN_ACTION_CLICK] && lv_btn_get_state(btn) != LV_BTN_STATE_INA) {
                  res = ext->actions[LV_BTN_ACTION_CLICK](btn);
              }
          } else if(c == LV_GROUP_KEY_LEFT || c == LV_GROUP_KEY_DOWN) {
              if(lv_btn_get_toggle(btn) != false) lv_btn_set_state(btn, LV_BTN_STATE_REL);
              if(ext->actions[LV_BTN_ACTION_CLICK] && lv_btn_get_state(btn) != LV_BTN_STATE_INA) {
                  res = ext->actions[LV_BTN_ACTION_CLICK](btn);
              }
          } else if(c == LV_GROUP_KEY_ENTER) {
              if(!ext->long_pr_action_executed) {
                  if(lv_btn_get_toggle(btn)) {
                      if(state == LV_BTN_STATE_REL) lv_btn_set_state(btn, LV_BTN_STATE_TGL_REL);
                      else if(state == LV_BTN_STATE_PR) lv_btn_set_state(btn, LV_BTN_STATE_TGL_PR);
                      else if(state == LV_BTN_STATE_TGL_REL) lv_btn_set_state(btn, LV_BTN_STATE_REL);
                      else if(state == LV_BTN_STATE_TGL_PR) lv_btn_set_state(btn, LV_BTN_STATE_PR);
                  }
                  if(ext->actions[LV_BTN_ACTION_CLICK] && state != LV_BTN_STATE_INA) {
                      res = ext->actions[LV_BTN_ACTION_CLICK](btn);
                  }
              }
              ext->long_pr_action_executed  = 0;
          }
      } else if(sign == LV_SIGNAL_CLEANUP) {
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
          if(btn == ink_obj) {
              lv_anim_del(ink_obj, (lv_anim_fp_t)lv_btn_ink_effect_anim);
              ink_obj = NULL;
          }
  #endif
      } 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_btn";
      }
  
      return res;
  }
  
  #if USE_LV_ANIMATION && LV_BTN_INK_EFFECT
  
  /**
   * The animator function of inking. CAlled to increase the radius of ink
   * @param btn pointer to the animated button
   * @param val the new radius
   */
  static void lv_btn_ink_effect_anim(lv_obj_t * btn, int32_t val)
  {
      if(btn) {
          ink_act_value = val;
          lv_obj_invalidate(btn);
      }
  }
  
  /**
   * Called to clean up when the ink animation is ready
   * @param p unused
   */
  static void lv_btn_ink_effect_anim_ready(void * p)
  {
      (void) p;    /*Unused*/
  
      lv_btn_ext_t * ext = lv_obj_get_ext_attr(ink_obj);
      lv_btn_state_t state = lv_btn_get_state(ink_obj);
  
      lv_obj_invalidate(ink_obj);
      ink_ready = true;
  
      if((state == LV_BTN_STATE_REL || state == LV_BTN_STATE_TGL_REL) && ext->toggle == 0 && ink_playback == false) {
          lv_anim_t a;
          a.var = ink_obj;
          a.start = LV_BTN_INK_VALUE_MAX;
          a.end = 0;
          a.fp = (lv_anim_fp_t)lv_btn_ink_effect_anim;
          a.path = lv_anim_path_linear;
          a.end_cb = lv_btn_ink_effect_anim_ready;
          a.act_time = -ext->ink_wait_time;
          a.time = ext->ink_out_time;
          a.playback = 0;
          a.playback_pause = 0;
          a.repeat = 0;
          a.repeat_pause = 0;
          lv_anim_create(&a);
  
          ink_playback = true;
      } else {
          ink_obj = NULL;
      }
  }
  #endif /*USE_LV_ANIMATION*/
  
  #endif
  