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Carter committed 2026-07-21 13:45:37 -04:00
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include/liblvgl/core/lv_obj.h
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/**
* @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 : 6; /**< Number of event callbacks stored in `event_dsc` array*/
uint8_t layer_type : 2; /**< Cache the layer type here. Element of @lv_intermediate_layer_type_t */
} _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*/