/**
  * @file lv_obj.h
  *
  */
 
 #ifndef LV_OBJ_H
 #define LV_OBJ_H
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /*********************
  *      INCLUDES
  *********************/
 #include "../lv_conf_internal.h"
 
 #include <stddef.h>
 #include <stdbool.h>
 #include "../misc/lv_style.h"
 #include "../misc/lv_types.h"
 #include "../misc/lv_area.h"
 #include "../misc/lv_color.h"
 #include "../misc/lv_assert.h"
 #include "../hal/lv_hal.h"
 
 /*********************
  *      DEFINES
  *********************/
 
 /**********************
  *      TYPEDEFS
  **********************/
 
 struct _lv_obj_t;
 
 /**
  * Possible states of a widget.
  * OR-ed values are possible
  */
 enum {
     LV_STATE_DEFAULT     =  0x0000,
     LV_STATE_CHECKED     =  0x0001,
     LV_STATE_FOCUSED     =  0x0002,
     LV_STATE_FOCUS_KEY   =  0x0004,
     LV_STATE_EDITED      =  0x0008,
     LV_STATE_HOVERED     =  0x0010,
     LV_STATE_PRESSED     =  0x0020,
     LV_STATE_SCROLLED    =  0x0040,
     LV_STATE_DISABLED    =  0x0080,
 
     LV_STATE_USER_1      =  0x1000,
     LV_STATE_USER_2      =  0x2000,
     LV_STATE_USER_3      =  0x4000,
     LV_STATE_USER_4      =  0x8000,
 
     LV_STATE_ANY = 0xFFFF,    /**< Special value can be used in some functions to target all states*/
 };
 
 typedef uint16_t lv_state_t;
 
 /**
  * The possible parts of widgets.
  * The parts can be considered as the internal building block of the widgets.
  * E.g. slider = background + indicator + knob
  * Not all parts are used by every widget
  */
 enum {
     LV_PART_MAIN         = 0x000000,   /**< A background like rectangle*/
     LV_PART_SCROLLBAR    = 0x010000,   /**< The scrollbar(s)*/
     LV_PART_INDICATOR    = 0x020000,   /**< Indicator, e.g. for slider, bar, switch, or the tick box of the checkbox*/
     LV_PART_KNOB         = 0x030000,   /**< Like handle to grab to adjust the value*/
     LV_PART_SELECTED     = 0x040000,   /**< Indicate the currently selected option or section*/
     LV_PART_ITEMS        = 0x050000,   /**< Used if the widget has multiple similar elements (e.g. table cells)*/
     LV_PART_TICKS        = 0x060000,   /**< Ticks on scale e.g. for a chart or meter*/
     LV_PART_CURSOR       = 0x070000,   /**< Mark a specific place e.g. for text area's cursor or on a chart*/
 
     LV_PART_CUSTOM_FIRST = 0x080000,    /**< Extension point for custom widgets*/
 
     LV_PART_ANY          = 0x0F0000,    /**< Special value can be used in some functions to target all parts*/
 };
 
 typedef uint32_t lv_part_t;
 
 /**
  * On/Off features controlling the object's behavior.
  * OR-ed values are possible
  */
 enum {
     LV_OBJ_FLAG_HIDDEN          = (1L << 0),  /**< Make the object hidden. (Like it wasn't there at all)*/
     LV_OBJ_FLAG_CLICKABLE       = (1L << 1),  /**< Make the object clickable by the input devices*/
     LV_OBJ_FLAG_CLICK_FOCUSABLE = (1L << 2),  /**< Add focused state to the object when clicked*/
     LV_OBJ_FLAG_CHECKABLE       = (1L << 3),  /**< Toggle checked state when the object is clicked*/
     LV_OBJ_FLAG_SCROLLABLE      = (1L << 4),  /**< Make the object scrollable*/
     LV_OBJ_FLAG_SCROLL_ELASTIC  = (1L << 5),  /**< Allow scrolling inside but with slower speed*/
     LV_OBJ_FLAG_SCROLL_MOMENTUM = (1L << 6),  /**< Make the object scroll further when "thrown"*/
     LV_OBJ_FLAG_SCROLL_ONE      = (1L << 7),  /**< Allow scrolling only one snappable children*/
     LV_OBJ_FLAG_SCROLL_CHAIN_HOR = (1L << 8), /**< Allow propagating the horizontal scroll to a parent*/
     LV_OBJ_FLAG_SCROLL_CHAIN_VER = (1L << 9), /**< Allow propagating the vertical scroll to a parent*/
     LV_OBJ_FLAG_SCROLL_CHAIN     = (LV_OBJ_FLAG_SCROLL_CHAIN_HOR | LV_OBJ_FLAG_SCROLL_CHAIN_VER),
     LV_OBJ_FLAG_SCROLL_ON_FOCUS = (1L << 10),  /**< Automatically scroll object to make it visible when focused*/
     LV_OBJ_FLAG_SCROLL_WITH_ARROW  = (1L << 11), /**< Allow scrolling the focused object with arrow keys*/
     LV_OBJ_FLAG_SNAPPABLE       = (1L << 12), /**< If scroll snap is enabled on the parent it can snap to this object*/
     LV_OBJ_FLAG_PRESS_LOCK      = (1L << 13), /**< Keep the object pressed even if the press slid from the object*/
     LV_OBJ_FLAG_EVENT_BUBBLE    = (1L << 14), /**< Propagate the events to the parent too*/
     LV_OBJ_FLAG_GESTURE_BUBBLE  = (1L << 15), /**< Propagate the gestures to the parent*/
     LV_OBJ_FLAG_ADV_HITTEST     = (1L << 16), /**< Allow performing more accurate hit (click) test. E.g. consider rounded corners.*/
     LV_OBJ_FLAG_IGNORE_LAYOUT   = (1L << 17), /**< Make the object position-able by the layouts*/
     LV_OBJ_FLAG_FLOATING        = (1L << 18), /**< Do not scroll the object when the parent scrolls and ignore layout*/
     LV_OBJ_FLAG_OVERFLOW_VISIBLE = (1L << 19), /**< Do not clip the children's content to the parent's boundary*/
 
     LV_OBJ_FLAG_LAYOUT_1        = (1L << 23), /**< Custom flag, free to use by layouts*/
     LV_OBJ_FLAG_LAYOUT_2        = (1L << 24), /**< Custom flag, free to use by layouts*/
 
     LV_OBJ_FLAG_WIDGET_1        = (1L << 25), /**< Custom flag, free to use by widget*/
     LV_OBJ_FLAG_WIDGET_2        = (1L << 26), /**< Custom flag, free to use by widget*/
     LV_OBJ_FLAG_USER_1          = (1L << 27), /**< Custom flag, free to use by user*/
     LV_OBJ_FLAG_USER_2          = (1L << 28), /**< Custom flag, free to use by user*/
     LV_OBJ_FLAG_USER_3          = (1L << 29), /**< Custom flag, free to use by user*/
     LV_OBJ_FLAG_USER_4          = (1L << 30), /**< Custom flag, free to use by user*/
 
 };
 
 
 typedef uint32_t lv_obj_flag_t;
 
 /**
  * `type` field in `lv_obj_draw_part_dsc_t` if `class_p = lv_obj_class`
  * Used in `LV_EVENT_DRAW_PART_BEGIN` and `LV_EVENT_DRAW_PART_END`
  */
 typedef enum {
     LV_OBJ_DRAW_PART_RECTANGLE,  /**< The main rectangle*/
     LV_OBJ_DRAW_PART_BORDER_POST,/**< The border if style_border_post = true*/
     LV_OBJ_DRAW_PART_SCROLLBAR,  /**< The scrollbar*/
 } lv_obj_draw_part_type_t;
 
 #include "lv_obj_tree.h"
 #include "lv_obj_pos.h"
 #include "lv_obj_scroll.h"
 #include "lv_obj_style.h"
 #include "lv_obj_draw.h"
 #include "lv_obj_class.h"
 #include "lv_event.h"
 #include "lv_group.h"
 
 /**
  * Make the base object's class publicly available.
  */
 extern const lv_obj_class_t lv_obj_class;
 
 /**
  * Special, rarely used attributes.
  * They are allocated automatically if any elements is set.
  */
 typedef struct {
     struct _lv_obj_t ** children;       /**< Store the pointer of the children in an array.*/
     uint32_t child_cnt;                 /**< Number of children*/
     lv_group_t * group_p;
 
     struct _lv_event_dsc_t * event_dsc; /**< Dynamically allocated event callback and user data array*/
     lv_point_t scroll;                  /**< The current X/Y scroll offset*/
 
     lv_coord_t ext_click_pad;           /**< Extra click padding in all direction*/
     lv_coord_t ext_draw_size;           /**< EXTend the size in every direction for drawing.*/
 
     lv_scrollbar_mode_t scrollbar_mode : 2; /**< How to display scrollbars*/
     lv_scroll_snap_t scroll_snap_x : 2;     /**< Where to align the snappable children horizontally*/
     lv_scroll_snap_t scroll_snap_y : 2;     /**< Where to align the snappable children vertically*/
     lv_dir_t scroll_dir : 4;                /**< The allowed scroll direction(s)*/
     uint8_t event_dsc_cnt;                  /**< Number of event callbacks stored in `event_dsc` array*/
 } _lv_obj_spec_attr_t;
 
 typedef struct _lv_obj_t {
     const lv_obj_class_t * class_p;
     struct _lv_obj_t * parent;
     _lv_obj_spec_attr_t * spec_attr;
     _lv_obj_style_t * styles;
 #if LV_USE_USER_DATA
     void * user_data;
 #endif
     lv_area_t coords;
     lv_obj_flag_t flags;
     lv_state_t state;
     uint16_t layout_inv : 1;
     uint16_t scr_layout_inv : 1;
     uint16_t skip_trans : 1;
     uint16_t style_cnt  : 6;
     uint16_t h_layout   : 1;
     uint16_t w_layout   : 1;
 } lv_obj_t;
 
 
 /**********************
  * GLOBAL PROTOTYPES
  **********************/
 
 /**
  * Initialize LVGL library.
  * Should be called before any other LVGL related function.
  */
 void lv_init(void);
 
 #if LV_ENABLE_GC || !LV_MEM_CUSTOM
 
 /**
  * Deinit the 'lv' library
  * Currently only implemented when not using custom allocators, or GC is enabled.
  */
 void lv_deinit(void);
 
 #endif
 
 /**
  * Returns whether the 'lv' library is currently initialized
  */
 bool lv_is_initialized(void);
 
 /**
  * Create a base object (a rectangle)
  * @param parent    pointer to a parent object. If NULL then a screen will be created.
  * @return          pointer to the new object
  */
 lv_obj_t * lv_obj_create(lv_obj_t * parent);
 
 
 /*=====================
  * Setter functions
  *====================*/
 
 /**
  * Set one or more flags
  * @param obj   pointer to an object
  * @param f     R-ed values from `lv_obj_flag_t` to set.
  */
 void lv_obj_add_flag(lv_obj_t * obj, lv_obj_flag_t f);
 
 /**
  * Clear one or more flags
  * @param obj   pointer to an object
  * @param f     OR-ed values from `lv_obj_flag_t` to set.
  */
 void lv_obj_clear_flag(lv_obj_t * obj, lv_obj_flag_t f);
 
 
 /**
  * Add one or more states to the object. The other state bits will remain unchanged.
  * If specified in the styles, transition animation will be started from the previous state to the current.
  * @param obj       pointer to an object
  * @param state     the states to add. E.g `LV_STATE_PRESSED | LV_STATE_FOCUSED`
  */
 void lv_obj_add_state(lv_obj_t * obj, lv_state_t state);
 
 /**
  * Remove one or more states to the object. The other state bits will remain unchanged.
  * If specified in the styles, transition animation will be started from the previous state to the current.
  * @param obj       pointer to an object
  * @param state     the states to add. E.g `LV_STATE_PRESSED | LV_STATE_FOCUSED`
  */
 void lv_obj_clear_state(lv_obj_t * obj, lv_state_t state);
 
 /**
  * Set the user_data field of the object
  * @param obj   pointer to an object
  * @param user_data   pointer to the new user_data.
  */
 #if LV_USE_USER_DATA
 static inline void lv_obj_set_user_data(lv_obj_t * obj, void * user_data)
 {
     obj->user_data = user_data;
 }
 #endif
 
 /*=======================
  * Getter functions
  *======================*/
 
 /**
  * Check if a given flag or all the given flags are set on an object.
  * @param obj   pointer to an object
  * @param f     the flag(s) to check (OR-ed values can be used)
  * @return      true: all flags are set; false: not all flags are set
  */
 bool lv_obj_has_flag(const lv_obj_t * obj, lv_obj_flag_t f);
 
 /**
  * Check if a given flag or any of the flags are set on an object.
  * @param obj   pointer to an object
  * @param f     the flag(s) to check (OR-ed values can be used)
  * @return      true: at lest one flag flag is set; false: none of the flags are set
  */
 bool lv_obj_has_flag_any(const lv_obj_t * obj, lv_obj_flag_t f);
 
 /**
  * Get the state of an object
  * @param obj   pointer to an object
  * @return      the state (OR-ed values from `lv_state_t`)
  */
 lv_state_t lv_obj_get_state(const lv_obj_t * obj);
 
 /**
  * Check if the object is in a given state or not.
  * @param obj       pointer to an object
  * @param state     a state or combination of states to check
  * @return          true: `obj` is in `state`; false: `obj` is not in `state`
  */
 bool lv_obj_has_state(const lv_obj_t * obj, lv_state_t state);
 
 /**
  * Get the group of the object
  * @param       obj pointer to an object
  * @return      the pointer to group of the object
  */
 void * lv_obj_get_group(const lv_obj_t * obj);
 
 /**
  * Get the user_data field of the object
  * @param obj   pointer to an object
  * @return      the pointer to the user_data of the object
  */
 #if LV_USE_USER_DATA
 static inline void * lv_obj_get_user_data(lv_obj_t * obj)
 {
     return obj->user_data;
 }
 #endif
 
 /*=======================
  * Other functions
  *======================*/
 
 /**
  * Allocate special data for an object if not allocated yet.
  * @param obj   pointer to an object
  */
 void lv_obj_allocate_spec_attr(lv_obj_t * obj);
 
 /**
  * Check the type of obj.
  * @param obj       pointer to an object
  * @param class_p   a class to check (e.g. `lv_slider_class`)
  * @return          true: `class_p` is the `obj` class.
  */
 bool lv_obj_check_type(const lv_obj_t * obj, const lv_obj_class_t * class_p);
 
 /**
  * Check if any object has a given class (type).
  * It checks the ancestor classes too.
  * @param obj       pointer to an object
  * @param class_p   a class to check (e.g. `lv_slider_class`)
  * @return          true: `obj` has the given class
  */
 bool lv_obj_has_class(const lv_obj_t * obj, const lv_obj_class_t * class_p);
 
 /**
  * Get the class (type) of the object
  * @param obj   pointer to an object
  * @return      the class (type) of the object
  */
 const lv_obj_class_t * lv_obj_get_class(const lv_obj_t * obj);
 
 /**
  * Check if any object is still "alive".
  * @param obj       pointer to an object
  * @return          true: valid
  */
 bool lv_obj_is_valid(const lv_obj_t * obj);
 
 /**
  * Scale the given number of pixels (a distance or size) relative to a 160 DPI display
  * considering the DPI of the `obj`'s display.
  * It ensures that e.g. `lv_dpx(100)` will have the same physical size regardless to the
  * DPI of the display.
  * @param obj   an object whose display's dpi should be considered
  * @param n     the number of pixels to scale
  * @return      `n x current_dpi/160`
  */
 static inline lv_coord_t lv_obj_dpx(const lv_obj_t * obj, lv_coord_t n)
 {
     return _LV_DPX_CALC(lv_disp_get_dpi(lv_obj_get_disp(obj)), n);
 }
 
 /**********************
  *      MACROS
  **********************/
 
 #if LV_USE_ASSERT_OBJ
 #  define LV_ASSERT_OBJ(obj_p, obj_class)                                                               \
     do {                                                                                                \
         LV_ASSERT_MSG(obj_p != NULL, "The object is NULL");                                             \
         LV_ASSERT_MSG(lv_obj_has_class(obj_p, obj_class) == true, "Incompatible object type.");         \
         LV_ASSERT_MSG(lv_obj_is_valid(obj_p)  == true, "The object is invalid, deleted or corrupted?"); \
     } while(0)
 # else
 #  define LV_ASSERT_OBJ(obj_p, obj_class) do{}while(0)
 #endif
 
 #if LV_USE_LOG && LV_LOG_TRACE_OBJ_CREATE
 #  define LV_TRACE_OBJ_CREATE(...) LV_LOG_TRACE(__VA_ARGS__)
 #else
 #  define LV_TRACE_OBJ_CREATE(...)
 #endif
 
 
 #ifdef __cplusplus
 } /*extern "C"*/
 #endif
 
 #endif /*LV_OBJ_H*/

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