text: /**
   * @file lv_win.h
   *
   */
  
  #ifndef LV_WIN_H
  #define LV_WIN_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /*********************
   *      INCLUDES
   *********************/
  #include "../lv_conf_internal.h"
  
  #if LV_USE_WIN != 0
  
  /*Testing of dependencies*/
  #if LV_USE_BTN == 0
  #error "lv_win: lv_btn is required. Enable it in lv_conf.h (LV_USE_BTN  1) "
  #endif
  
  #if LV_USE_LABEL == 0
  #error "lv_win: lv_label is required. Enable it in lv_conf.h (LV_USE_LABEL  1) "
  #endif
  
  #if LV_USE_IMG == 0
  #error "lv_win: lv_img is required. Enable it in lv_conf.h (LV_USE_IMG  1) "
  #endif
  
  #if LV_USE_PAGE == 0
  #error "lv_win: lv_page is required. Enable it in lv_conf.h (LV_USE_PAGE  1) "
  #endif
  
  #include "../lv_core/lv_obj.h"
  #include "lv_cont.h"
  #include "lv_btn.h"
  #include "lv_label.h"
  #include "lv_img.h"
  #include "lv_page.h"
  
  /*********************
   *      DEFINES
   *********************/
  
  /**********************
   *      TYPEDEFS
   **********************/
  
  /*Data of window*/
  typedef struct
  {
      /*Ext. of ancestor*/
      /*New data for this type */
      lv_obj_t * page;                  /*Pointer to a page which holds the content*/
      lv_obj_t * header;                /*Pointer to the header container of the window*/
      lv_obj_t * title;                 /*Pointer to the title label of the window*/
      const lv_style_t * style_btn_rel; /*Control button releases style*/
      const lv_style_t * style_btn_pr;  /*Control button pressed style*/
      lv_coord_t btn_size;              /*Size of the control buttons (square)*/
  } lv_win_ext_t;
  
  /** Window styles. */
  enum {
      LV_WIN_STYLE_BG, /**< Window object background style. */
      LV_WIN_STYLE_CONTENT, /**< Window content style. */
      LV_WIN_STYLE_SB, /**< Window scrollbar style. */
      LV_WIN_STYLE_HEADER, /**< Window titlebar background style. */
      LV_WIN_STYLE_BTN_REL, /**< Same meaning as ordinary button styles. */
      LV_WIN_STYLE_BTN_PR,
  };
  typedef uint8_t lv_win_style_t;
  
  /**********************
   * GLOBAL PROTOTYPES
   **********************/
  
  /**
   * Create a window objects
   * @param par pointer to an object, it will be the parent of the new window
   * @param copy pointer to a window object, if not NULL then the new object will be copied from it
   * @return pointer to the created window
   */
  lv_obj_t * lv_win_create(lv_obj_t * par, const lv_obj_t * copy);
  
  /**
   * Delete all children of the scrl object, without deleting scrl child.
   * @param win pointer to an object
   */
  void lv_win_clean(lv_obj_t * win);
  
  /*======================
   * Add/remove functions
   *=====================*/
  
  /**
   * Add control button to the header of the window
   * @param win pointer to a window object
   * @param img_src an image source ('lv_img_t' variable, path to file or a symbol)
   * @return pointer to the created button object
   */
  lv_obj_t * lv_win_add_btn(lv_obj_t * win, const void * img_src);
  
  /*=====================
   * Setter functions
   *====================*/
  
  /**
   * Can be assigned to a window control button to close the window
   * @param btn pointer to the control button on teh widows header
   * @param evet the event type
   */
  void lv_win_close_event_cb(lv_obj_t * btn, lv_event_t event);
  
  /**
   * Set the title of a window
   * @param win pointer to a window object
   * @param title string of the new title
   */
  void lv_win_set_title(lv_obj_t * win, const char * title);
  
  /**
   * Set the control button size of a window
   * @param win pointer to a window object
   * @return control button size
   */
  void lv_win_set_btn_size(lv_obj_t * win, lv_coord_t size);
  
  
  /**
   * Set the size of the content area.
   * @param win pointer to a window object
   * @param w width
   * @param h height (the window will be higher with the height of the header)
   */
  void lv_win_set_content_size(lv_obj_t * win, lv_coord_t w, lv_coord_t h);
  
  /**
   * Set the layout of the window
   * @param win pointer to a window object
   * @param layout the layout from 'lv_layout_t'
   */
  void lv_win_set_layout(lv_obj_t * win, lv_layout_t layout);
  
  /**
   * Set the scroll bar mode of a window
   * @param win pointer to a window object
   * @param sb_mode the new scroll bar mode from  'lv_sb_mode_t'
   */
  void lv_win_set_sb_mode(lv_obj_t * win, lv_sb_mode_t sb_mode);
  
  /**
   * Set focus animation duration on `lv_win_focus()`
   * @param win pointer to a window object
   * @param anim_time duration of animation [ms]
   */
  void lv_win_set_anim_time(lv_obj_t * win, uint16_t anim_time);
  
  /**
   * Set a style of a window
   * @param win pointer to a window object
   * @param type which style should be set
   * @param style pointer to a style
   */
  void lv_win_set_style(lv_obj_t * win, lv_win_style_t type, const lv_style_t * style);
  
  /**
   * Set drag status of a window. If set to 'true' window can be dragged like on a PC.
   * @param win pointer to a window object
   * @param en whether dragging is enabled
   */
  void lv_win_set_drag(lv_obj_t * win, bool en);
  
  /*=====================
   * Getter functions
   *====================*/
  
  /**
   * Get the title of a window
   * @param win pointer to a window object
   * @return title string of the window
   */
  const char * lv_win_get_title(const lv_obj_t * win);
  
  /**
   * Get the content holder object of window (`lv_page`) to allow additional customization
   * @param win pointer to a window object
   * @return the Page object where the window's content is
   */
  lv_obj_t * lv_win_get_content(const lv_obj_t * win);
  
  /**
   * Get the control button size of a window
   * @param win pointer to a window object
   * @return control button size
   */
  lv_coord_t lv_win_get_btn_size(const lv_obj_t * win);
  
  /**
   * Get the pointer of a widow from one of  its control button.
   * It is useful in the action of the control buttons where only button is known.
   * @param ctrl_btn pointer to a control button of a window
   * @return pointer to the window of 'ctrl_btn'
   */
  lv_obj_t * lv_win_get_from_btn(const lv_obj_t * ctrl_btn);
  
  /**
   * Get the layout of a window
   * @param win pointer to a window object
   * @return the layout of the window (from 'lv_layout_t')
   */
  lv_layout_t lv_win_get_layout(lv_obj_t * win);
  
  /**
   * Get the scroll bar mode of a window
   * @param win pointer to a window object
   * @return the scroll bar mode of the window (from 'lv_sb_mode_t')
   */
  lv_sb_mode_t lv_win_get_sb_mode(lv_obj_t * win);
  
  /**
   * Get focus animation duration
   * @param win pointer to a window object
   * @return duration of animation [ms]
   */
  uint16_t lv_win_get_anim_time(const lv_obj_t * win);
  
  /**
   * Get width of the content area (page scrollable) of the window
   * @param win pointer to a window object
   * @return the width of the content area
   */
  lv_coord_t lv_win_get_width(lv_obj_t * win);
  
  /**
   * Get a style of a window
   * @param win pointer to a button object
   * @param type which style window be get
   * @return style pointer to a style
   */
  const lv_style_t * lv_win_get_style(const lv_obj_t * win, lv_win_style_t type);
  
  /**
   * Get drag status of a window. If set to 'true' window can be dragged like on a PC.
   * @param win pointer to a window object
   * @return whether window is draggable
   */
  static inline bool lv_win_get_drag(const lv_obj_t * win)
  {
      return lv_obj_get_drag(win);
  }
  
  /*=====================
   * Other functions
   *====================*/
  
  /**
   * Focus on an object. It ensures that the object will be visible in the window.
   * @param win pointer to a window object
   * @param obj pointer to an object to focus (must be in the window)
   * @param anim_en LV_ANIM_ON focus with an animation; LV_ANIM_OFF focus without animation
   */
  void lv_win_focus(lv_obj_t * win, lv_obj_t * obj, lv_anim_enable_t anim_en);
  
  /**
   * Scroll the window horizontally
   * @param win pointer to a window object
   * @param dist the distance to scroll (< 0: scroll right; > 0 scroll left)
   */
  static inline void lv_win_scroll_hor(lv_obj_t * win, lv_coord_t dist)
  {
      lv_win_ext_t * ext = (lv_win_ext_t *)lv_obj_get_ext_attr(win);
      lv_page_scroll_hor(ext->page, dist);
  }
  /**
   * Scroll the window vertically
   * @param win pointer to a window object
   * @param dist the distance to scroll (< 0: scroll down; > 0 scroll up)
   */
  static inline void lv_win_scroll_ver(lv_obj_t * win, lv_coord_t dist)
  {
      lv_win_ext_t * ext = (lv_win_ext_t *)lv_obj_get_ext_attr(win);
      lv_page_scroll_ver(ext->page, dist);
  }
  
  /**********************
   *      MACROS
   **********************/
  
  #endif /*LV_USE_WIN*/
  
  #ifdef __cplusplus
  } /* extern "C" */
  #endif
  
  #endif /*LV_WIN_H*/
  