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lvgl/lv_objx/lv_calendar.c
Gabor Kiss-Vamosi 125555afcf lv_calendar added
2018-05-16 22:34:39 +02:00

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/**
* @file lv_calendar.c
*
*/
/*********************
* INCLUDES
*********************/
#include "../../lv_conf.h"
#if USE_LV_CALENDAR != 0
#include "lv_calendar.h"
#include "../lv_draw/lv_draw.h"
#include "../lv_hal/lv_hal_indev.h"
#include "../lv_misc/lv_math.h"
#include "../lv_core/lv_indev.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
typedef enum
{
DAY_DRAW_PREV_MONTH,
DAY_DRAW_ACT_MONTH,
DAY_DRAW_NEXT_MONTH,
}day_draw_state_t;
/**********************
* STATIC PROTOTYPES
**********************/
static bool lv_calendar_design(lv_obj_t * calendar, const lv_area_t * mask, lv_design_mode_t mode);
static lv_res_t lv_calendar_signal(lv_obj_t * calendar, lv_signal_t sign, void * param);
static lv_coord_t get_header_height(lv_obj_t * calendar);
static void draw_header(lv_obj_t * calendar, const lv_area_t * mask);
static void draw_day_names(lv_obj_t * calendar, const lv_area_t * mask);
static void draw_days(lv_obj_t * calendar, const lv_area_t * mask);
static uint8_t get_day_of_week(uint32_t year, uint32_t month, uint32_t day);
static bool is_highlighted(lv_obj_t * calendar, int32_t year, int32_t month, int32_t day);
static const char * get_month_name(int32_t month);
static uint8_t get_month_length(int32_t year, int32_t month);
static uint8_t is_leap_year(uint32_t year);
/**********************
* STATIC VARIABLES
**********************/
static lv_signal_func_t ancestor_signal;
static lv_design_func_t ancestor_design;
static const char * day_name[7] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
static const char * month_name[12] = {"January", "February", "March", "April",
"May", "June", "July", "August",
"September", "October", "November", "December"};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Create a calendar object
* @param par pointer to an object, it will be the parent of the new calendar
* @param copy pointer to a calendar object, if not NULL then the new object will be copied from it
* @return pointer to the created calendar
*/
lv_obj_t * lv_calendar_create(lv_obj_t * par, lv_obj_t * copy)
{
/*Create the ancestor of calendar*/
lv_obj_t * new_calendar = lv_obj_create(par, copy);
lv_mem_assert(new_calendar);
/*Allocate the calendar type specific extended data*/
lv_calendar_ext_t * ext = lv_obj_allocate_ext_attr(new_calendar, sizeof(lv_calendar_ext_t));
lv_mem_assert(ext);
if(ancestor_signal == NULL) ancestor_signal = lv_obj_get_signal_func(new_calendar);
if(ancestor_design == NULL) ancestor_design = lv_obj_get_design_func(new_calendar);
/*Initialize the allocated 'ext' */
ext->today.year = 2018;
ext->today.month= 1;
ext->today.day= 1;
ext->showed_date.year = 2018;
ext->showed_date.month = 1;
ext->showed_date.day= 1;
ext->highlighted_dates = NULL;
ext->highlighted_dates_num = 0;
ext->style_header = &lv_style_plain_color;
ext->style_header_pr = &lv_style_pretty_color;
ext->style_highlighted = &lv_style_plain_color;
ext->style_inactive_days = &lv_style_btn_ina;
ext->style_week_box = &lv_style_plain_color;
ext->style_today_box = &lv_style_pretty_color;
ext->style_day_names = &lv_style_pretty;
/*The signal and design functions are not copied so set them here*/
lv_obj_set_signal_func(new_calendar, lv_calendar_signal);
lv_obj_set_design_func(new_calendar, lv_calendar_design);
/*Init the new calendar calendar*/
if(copy == NULL) {
lv_obj_set_size(new_calendar, LV_DPI * 2, LV_DPI * 2);
lv_obj_set_style(new_calendar, &lv_style_pretty);
}
/*Copy an existing calendar*/
else {
lv_calendar_ext_t * copy_ext = lv_obj_get_ext_attr(copy);
/*Refresh the style with new signal function*/
lv_obj_refresh_style(new_calendar);
}
return new_calendar;
}
/*======================
* Add/remove functions
*=====================*/
/*
* New object specific "add" or "remove" functions come here
*/
/*=====================
* Setter functions
*====================*/
/**
* Set the today's date
* @param calendar pointer to a calendar object
* @param today pointer to an `lv_calendar_date_t` variable containing the date of today. The value will be saved it can be local variable too.
*/
void lv_calendar_set_today_date(lv_obj_t * calendar, lv_calendar_date_t * today)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
ext->today.year = today->year;
ext->today.month = today->month;
ext->today.day = today->day;
lv_obj_invalidate(calendar);
}
/**
* Set the currently showed
* @param calendar pointer to a calendar object
* @param showed pointer to an `lv_calendar_date_t` variable containing the date to show. The value will be saved it can be local variable too.
*/
void lv_calendar_set_showed_date(lv_obj_t * calendar, lv_calendar_date_t * showed)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
ext->showed_date.year = showed->year;
ext->showed_date.month = showed->month;
ext->showed_date.day = showed->day;
lv_obj_invalidate(calendar);
}
/**
* Set the the highlighted dates
* @param calendar pointer to a calendar object
* @param highlighted pointer to an `lv_calendar_date_t` array containing the dates. ONLY A POINTER WILL BE SAVED! CAN'T BE LOCAL ARRAY.
* @param data_num number of dates in the array
*/
void lv_calendar_set_highlighted_dates(lv_obj_t * calendar, lv_calendar_date_t * highlighted, uint16_t data_num)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
ext->highlighted_dates = highlighted;
ext->highlighted_dates_num = data_num;
lv_obj_invalidate(calendar);
}
/**
* Set a style of a calendar.
* @param calendar pointer to calendar object
* @param type which style should be set
* @param style pointer to a style
* */
void lv_calendar_set_style(lv_obj_t * calendar, lv_calendar_style_t type, lv_style_t *style)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
switch (type) {
case LV_CALENDAR_STYLE_BG:
lv_obj_set_style(calendar, style);
break;
case LV_CALENDAR_STYLE_DAY_NAMES:
ext->style_day_names = style;
break;
case LV_CALENDAR_STYLE_HEADER:
ext->style_header = style;
break;
case LV_CALENDAR_STYLE_HEADER_PR:
ext->style_header_pr = style;
break;
case LV_CALENDAR_STYLE_HIGHLIGHTED_DAYS:
ext->style_highlighted = style;
break;
case LV_CALENDAR_STYLE_INACTIVE_DAYS:
ext->style_inactive_days = style;
break;
case LV_CALENDAR_STYLE_TODAY_BOX:
ext->style_today_box = style;
break;
case LV_CALENDAR_STYLE_WEEK_BOX:
ext->style_week_box = style;
break;
}
lv_obj_invalidate(calendar);
}
/*=====================
* Getter functions
*====================*/
/**
* Get the today's date
* @param calendar pointer to a calendar object
* @return return pointer to an `lv_calendar_date_t` variable containing the date of today.
*/
lv_calendar_date_t * lv_calendar_get_today_date(lv_obj_t * calendar)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
return &ext->today;
}
/**
* Get the currently showed
* @param calendar pointer to a calendar object
* @return pointer to an `lv_calendar_date_t` variable containing the date is being shown.
*/
lv_calendar_date_t * lv_calendar_get_showed_date(lv_obj_t * calendar, lv_calendar_date_t * showed)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
return &ext->showed_date;
}
/**
* Get the the highlighted dates
* @param calendar pointer to a calendar object
* @return pointer to an `lv_calendar_date_t` array containing the dates.
*/
lv_calendar_date_t * lv_calendar_get_highlighted_dates(lv_obj_t * calendar, lv_calendar_date_t * highlighted, uint16_t data_num)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
return ext->highlighted_dates;
}
/**
* Get the number of the highlighted dates
* @param calendar pointer to a calendar object
* @return number of highlighted days
*/
uint16_t lv_calendar_get_highlighted_dates_num(lv_obj_t * calendar, lv_calendar_date_t * highlighted, uint16_t data_num)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
return ext->highlighted_dates_num;
}
/**
* Get style of a calendar.
* @param calendar pointer to calendar object
* @param type which style should be get
* @return style pointer to the style
* */
lv_style_t * lv_calendar_get_style(lv_obj_t * calendar, lv_calendar_style_t type)
{
lv_calendar_ext_t *ext = lv_obj_get_ext_attr(calendar);
switch (type) {
case LV_CALENDAR_STYLE_BG: return lv_obj_get_style(calendar);
case LV_CALENDAR_STYLE_HEADER: return ext->style_header;
case LV_CALENDAR_STYLE_HEADER_PR: return ext->style_header_pr;
case LV_CALENDAR_STYLE_DAY_NAMES: return ext->style_day_names;
case LV_CALENDAR_STYLE_HIGHLIGHTED_DAYS: return ext->style_highlighted;
case LV_CALENDAR_STYLE_INACTIVE_DAYS: return ext->style_inactive_days;
case LV_CALENDAR_STYLE_WEEK_BOX: return ext->style_week_box;
case LV_CALENDAR_STYLE_TODAY_BOX: return ext->style_today_box;
default: return NULL;
}
/*To avoid warning*/
return NULL;
}
/*=====================
* Other functions
*====================*/
/*
* New object specific "other" functions come here
*/
/**********************
* STATIC FUNCTIONS
**********************/
/**
* Handle the drawing related tasks of the calendars
* @param calendar 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_calendar_design(lv_obj_t * calendar, const lv_area_t * mask, lv_design_mode_t mode)
{
/*Return false if the object is not covers the mask_p area*/
if(mode == LV_DESIGN_COVER_CHK) {
return false;
}
/*Draw the object*/
else if(mode == LV_DESIGN_DRAW_MAIN) {
lv_draw_rect(&calendar->coords, mask, lv_calendar_get_style(calendar, LV_CALENDAR_STYLE_BG));
draw_header(calendar, mask);
draw_day_names(calendar, mask);
draw_days(calendar, mask);
}
/*Post draw when the children are drawn*/
else if(mode == LV_DESIGN_DRAW_POST) {
}
return true;
}
/**
* Signal function of the calendar
* @param calendar pointer to a calendar 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_calendar_signal(lv_obj_t * calendar, lv_signal_t sign, void * param)
{
lv_res_t res;
/* Include the ancient signal function */
res = ancestor_signal(calendar, sign, param);
if(res != LV_RES_OK) return res;
if(sign == LV_SIGNAL_CLEANUP) {
/*Nothing to cleanup. (No dynamically allocated memory in 'ext')*/
}
else if(sign == LV_SIGNAL_PRESSING) {
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
lv_area_t header_area;
lv_area_copy(&header_area, &calendar->coords);
header_area.y2 = header_area.y1 + get_header_height(calendar);
lv_indev_t * indev = lv_indev_get_act();
lv_point_t p;
lv_indev_get_point(indev, &p);
if(lv_area_is_point_on(&header_area, &p)) {
if(p.x < header_area.x1 + lv_area_get_width(&header_area) / 2) {
if(ext->btn_pressing != -1) lv_obj_invalidate(calendar);
ext->btn_pressing = -1;
} else {
if(ext->btn_pressing != 1) lv_obj_invalidate(calendar);
ext->btn_pressing = 1;
}
} else {
if(ext->btn_pressing != 0) lv_obj_invalidate(calendar);
ext->btn_pressing = 0;
}
}
else if(sign == LV_SIGNAL_PRESS_LOST) {
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
ext->btn_pressing = 0;
lv_obj_invalidate(calendar);
}
else if(sign == LV_SIGNAL_RELEASED) {
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
if(ext->btn_pressing < 0) {
if(ext->showed_date.month <= 1) {
ext->showed_date.month = 12;
ext->showed_date.year --;
} else {
ext->showed_date.month --;
}
}
else if(ext->btn_pressing > 0) {
if(ext->showed_date.month >= 12) {
ext->showed_date.month = 1;
ext->showed_date.year ++;
} else {
ext->showed_date.month ++;
}
}
ext->btn_pressing = 0;
lv_obj_invalidate(calendar);
}
else if(sign == LV_SIGNAL_CONTROLL) {
uint8_t c = *((uint8_t*) param);
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
if(c == LV_GROUP_KEY_RIGHT || c == LV_GROUP_KEY_UP) {
if(ext->showed_date.month >= 12) {
ext->showed_date.month = 1;
ext->showed_date.year ++;
} else {
ext->showed_date.month ++;
}
lv_obj_invalidate(calendar);
}
else if(c == LV_GROUP_KEY_LEFT || c == LV_GROUP_KEY_DOWN) {
if(ext->showed_date.month <= 1) {
ext->showed_date.month = 12;
ext->showed_date.year --;
} else {
ext->showed_date.month --;
}
lv_obj_invalidate(calendar);
}
}
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_calendar";
}
return res;
}
/**
* Get the height of a calendar's header based on it's style
* @param calendar point to a calendar
* @return the header's height
*/
static lv_coord_t get_header_height(lv_obj_t * calendar)
{
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
return lv_font_get_height(ext->style_header->text.font) + ext->style_header->body.padding.ver * 2;
}
/**
* Draw the calendar header with month name and arrows
* @param calendar point to a calendar
* @param mask a mask for drawing
*/
static void draw_header(lv_obj_t * calendar, const lv_area_t * mask)
{
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
lv_area_t header_area;
header_area.x1 = calendar->coords.x1;
header_area.x2 = calendar->coords.x2;
header_area.y1 = calendar->coords.y1;
header_area.y2 = calendar->coords.y1 + get_header_height(calendar);
lv_draw_rect(&header_area, mask, ext->style_header);
/*Add the month name*/
header_area.y1 += ext->style_header->body.padding.ver;
lv_draw_label(&header_area, mask, ext->style_header, get_month_name(ext->showed_date.month), LV_TXT_FLAG_CENTER, NULL);
/*Add the left arrow*/
lv_style_t * arrow_style = ext->btn_pressing < 0 ? ext->style_header_pr : ext->style_header;
header_area.x1 += ext->style_header->body.padding.hor;
lv_draw_label(&header_area, mask, arrow_style, SYMBOL_LEFT, LV_TXT_FLAG_NONE, NULL);
/*Add the right arrow*/
arrow_style = ext->btn_pressing > 0 ? ext->style_header_pr : ext->style_header;
header_area.x1 = header_area.x2 - ext->style_header->body.padding.hor -
lv_txt_get_width(SYMBOL_RIGHT, 1, arrow_style->text.font,
arrow_style->text.line_space, LV_TXT_FLAG_NONE);
lv_draw_label(&header_area, mask, arrow_style, SYMBOL_RIGHT, LV_TXT_FLAG_NONE, NULL);
}
/**
* Draw the day's name below the header
* @param calendar point to a calendar
* @param mask a mask for drawing
*/
static void draw_day_names(lv_obj_t * calendar, const lv_area_t * mask)
{
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
lv_coord_t hpad = ext->style_day_names->body.padding.hor;
lv_coord_t w = lv_obj_get_width(calendar) - 2 * hpad;
lv_coord_t box_w = w / 7;
lv_area_t label_area;
label_area.y1 = calendar->coords.y1 + get_header_height(calendar) + ext->style_day_names->body.padding.ver;
label_area.y2 = label_area.y1 + lv_font_get_height(ext->style_day_names->text.font);
uint32_t i;
for(i = 0; i < 7; i++) {
label_area.x1 = calendar->coords.x1 + (w * i) / 7 + hpad;
label_area.x2 = label_area.x1 + box_w;
lv_draw_label(&label_area, mask, ext->style_day_names, day_name[i], LV_TXT_FLAG_CENTER, NULL);
}
}
/**
* Draw the date numbers in a matrix
* @param calendar point to a calendar
* @param mask a mask for drawing
*/
static void draw_days(lv_obj_t * calendar, const lv_area_t * mask)
{
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
lv_style_t * style_bg = lv_calendar_get_style(calendar, LV_CALENDAR_STYLE_BG);
lv_coord_t hpad = style_bg->body.padding.hor;
lv_area_t label_area;
label_area.y1 = calendar->coords.y1 + get_header_height(calendar) +
ext->style_day_names->body.padding.ver + lv_font_get_height(ext->style_day_names->text.font) +
style_bg->body.padding.ver;
label_area.y2 = label_area.y1 + lv_font_get_height(ext->style_day_names->text.font);
lv_coord_t w = lv_obj_get_width(calendar) - 2 * hpad;
lv_coord_t h = calendar->coords.y2 - label_area.y1 - style_bg->body.padding.ver;
lv_coord_t box_w = w / 7;
lv_coord_t vert_space = (h - (6 * lv_font_get_height(style_bg->text.font))) / 5;
uint32_t week;
uint8_t day_cnt;
uint8_t month_start_day = get_day_of_week(ext->showed_date.year, ext->showed_date.month, 1);
day_draw_state_t draw_state; /*true: Not the prev. or next month is drawn*/
lv_style_t * act_style;
/*If starting with the first day of the week then the previous month is not visible*/
if(month_start_day == 0) {
day_cnt = 1;
draw_state = DAY_DRAW_ACT_MONTH;
act_style = style_bg;
} else {
draw_state = DAY_DRAW_PREV_MONTH;
day_cnt = get_month_length(ext->showed_date.year, ext->showed_date.month - 1); /*Length of the previous month*/
day_cnt -= month_start_day - 1; /*First visible number of the previous month*/
act_style = ext->style_inactive_days;
}
bool month_of_today_shown = false;
if(ext->showed_date.year == ext->today.year &&
ext->showed_date.month == ext->today.month)
{
month_of_today_shown = true;
}
char buf[3];
bool in_week_box = false;
/*Draw 6 weeks*/
for(week = 0; week < 6; week++) {
/*Draw the "week box"*/
if(month_of_today_shown &&
((draw_state == DAY_DRAW_ACT_MONTH && ext->today.day >= day_cnt && ext->today.day < day_cnt + 7) ||
(draw_state == DAY_DRAW_PREV_MONTH && ext->today.day <= 7 - month_start_day && week == 0)))
{
lv_area_t week_box_area;
lv_area_copy(&week_box_area, &label_area); /*'label_area' is already set for this row*/
week_box_area.x1 = calendar->coords.x1 + style_bg->body.padding.hor - ext->style_week_box->body.padding.hor;
week_box_area.x2 = calendar->coords.x2 - style_bg->body.padding.hor + ext->style_week_box->body.padding.hor;
week_box_area.y1 -= ext->style_week_box->body.padding.ver;
week_box_area.y2 += ext->style_week_box->body.padding.ver;
lv_draw_rect(&week_box_area, mask, ext->style_week_box);
in_week_box = true;
} else {
in_week_box = false;
}
/*Draw the 7 days of a week*/
uint32_t day;
for(day = 0; day < 7; day++) {
/*The previous month is over*/
if(draw_state == DAY_DRAW_PREV_MONTH && day == month_start_day) {
draw_state = DAY_DRAW_ACT_MONTH;
day_cnt = 1;
act_style = style_bg;
}
/*The current month is over*/
if(draw_state == DAY_DRAW_ACT_MONTH &&
day_cnt > get_month_length(ext->showed_date.year, ext->showed_date.month))
{
draw_state = DAY_DRAW_NEXT_MONTH;
day_cnt = 1;
act_style = ext->style_inactive_days;
}
label_area.x1 = calendar->coords.x1 + (w * day) / 7 + hpad;
label_area.x2 = label_area.x1 + box_w;
/*Draw the "tiday box"*/
if(draw_state == DAY_DRAW_ACT_MONTH && month_of_today_shown && ext->today.day == day_cnt) {
lv_area_t today_box_area;
lv_area_copy(&today_box_area, &label_area);
today_box_area.x1 = label_area.x1;
today_box_area.x2 = label_area.x2;
today_box_area.y1 = label_area.y1 - ext->style_today_box->body.padding.ver;
today_box_area.y2 = label_area.y2 + ext->style_today_box->body.padding.ver;
lv_draw_rect(&today_box_area, mask, ext->style_today_box);
}
/*Get the final style : highlighted/week box/today box/normal*/
lv_style_t * final_style;
if (draw_state == DAY_DRAW_PREV_MONTH &&
is_highlighted(calendar, ext->showed_date.year - (ext->showed_date.month == 1 ? 1 : 0),
ext->showed_date.month == 1 ? 12 : ext->showed_date.month - 1,
day_cnt))
{
final_style = ext->style_highlighted;
}
else if (draw_state == DAY_DRAW_ACT_MONTH &&
is_highlighted(calendar, ext->showed_date.year,
ext->showed_date.month,
day_cnt))
{
final_style = ext->style_highlighted;
}
else if (draw_state == DAY_DRAW_NEXT_MONTH &&
is_highlighted(calendar, ext->showed_date.year + (ext->showed_date.month == 12 ? 1 : 0),
ext->showed_date.month == 12 ? 1 : ext->showed_date.month + 1,
day_cnt))
{
final_style = ext->style_highlighted;
}
else if(month_of_today_shown && day_cnt == ext->today.day && draw_state == DAY_DRAW_ACT_MONTH) final_style = ext->style_today_box;
else if (in_week_box && draw_state == DAY_DRAW_ACT_MONTH) final_style = ext->style_week_box;
else final_style = act_style;
/*Write the day's number*/
lv_math_num_to_str(day_cnt, buf);
lv_draw_label(&label_area, mask, final_style, buf, LV_TXT_FLAG_CENTER, NULL);
/*Go to the next day*/
day_cnt ++;
}
/*Got to the next weeks row*/
label_area.y1 += vert_space + lv_font_get_height(style_bg->text.font);
label_area.y2 += vert_space + lv_font_get_height(style_bg->text.font);
}
}
/**
* Check weather a date is highlighted or not
* @param calendar pointer to a calendar object
* @param year a year
* @param month a month [1..12]
* @param day a day [1..31]
* @return true: highlighted
*/
static bool is_highlighted(lv_obj_t * calendar, int32_t year, int32_t month, int32_t day)
{
lv_calendar_ext_t * ext = lv_obj_get_ext_attr(calendar);
if(ext->highlighted_dates == NULL || ext->highlighted_dates_num == 0) return false;
uint32_t i;
for(i = 0; i < ext->highlighted_dates_num; i++) {
if(ext->highlighted_dates[i].year == year &&
ext->highlighted_dates[i].month == month &&
ext->highlighted_dates[i].day == day)
{
return true;
}
}
return false;
}
/**
* Get the month name
* @param month a month. The range is basically [1..12] but [-11..1] is also supported to handle previous year
* @return
*/
static const char * get_month_name(int32_t month)
{
month --; /*Range of months id [1..12] but range of indexes is [0..11]*/
if(month < 0) month = 12 + month;
return month_name[month];
}
/**
* Get the number of days in a month
* @param year a year
* @param month a month. The range is basically [1..12] but [-11..1] is also supported to handle previous year
* @return [28..31]
*/
static uint8_t get_month_length(int32_t year, int32_t month)
{
month --; /*Range of months id [1..12] but range of indexes is [0..11]*/
if(month < 0) {
year--; /*Already in the previous year (won't be less then -12 to skip a whole year)*/
month = 12 + month; /*`month` is negative, the result will be < 12*/
}
if(month >= 12) {
year ++;
month -= 12;
}
/*month == 1 is february*/
return (month == 1) ? (28 + is_leap_year(year)) : 31 - month % 7 % 2;
}
/**
* Tells whether a year is leap year or not
* @param year a year
* @return 0: not leap year; 1: leap year
*/
static uint8_t is_leap_year(uint32_t year)
{
return (year % 4) || ((year % 100 == 0) && (year % 400)) ? 0 : 1;
}
/**
* Get the day of the week
* @param year a year
* @param month a month
* @param day a day
* @return [0..6] which means [Sun..Sat]
*/
static uint8_t get_day_of_week(uint32_t year, uint32_t month, uint32_t day)
{
uint32_t a = month < 3 ? 1 : 0;
uint32_t b = year - a;
uint32_t day_of_week = (day + (31 * (month - 2 + 12 * a) / 12) +
b + (b / 4) - (b / 100) + (b / 400)) % 7;
return day_of_week;
}
#endif
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