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/* ------------- calendar.c ------------- */
#include "dflat.h"
#ifndef NOCALENDAR
#define CALHEIGHT 17
#define CALWIDTH 33
static int DyMo[]={31,28,31,30,31,30,31,31,30,31,30,31};
static struct tm ttm, ctm;
static int dys[42];
static WINDOW Cwnd;
#ifndef strftime
static char *nameOfMonth[12]={"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
#endif
/* Returns 1 if year (0-based, not 1900-based) is a leap year (longer) */
int isLeapYear(int year)
{
if (!(year % 400))
return 1; /* 2000 is a leap year */
if (!(year % 100))
return 0; /* 1900 and 2100 are not */
if (!(year % 4))
return 1; /* multiple of 4? Then it is a leap year */
return 0; /* default: not a leap year */
}
static void FixDate(void)
{
int i,j;
/* Adjust Feb for leap year */
DyMo[1]=isLeapYear(1900+ttm.tm_year) ? 29 : 28;
/* Enforce ranges: 1..?? for mday, 0..11 for mon */
while (ttm.tm_mday > DyMo[ttm.tm_mon])
{
ttm.tm_mday -= DyMo[ttm.tm_mon];
ttm.tm_mon++;
if (ttm.tm_mon > 11)
{
ttm.tm_mon=0;
ttm.tm_year++;
}
}
/* re-calculate yday in 0..??? range */
ttm.tm_yday=0;
i=0;
while (i < ttm.tm_mon)
{
ttm.tm_yday += DyMo[i];
i++;
}
ttm.tm_yday+=ttm.tm_mday-1;
/* 1st of January of 1900 (tm_year base) was a Monday (wday=1) */
i=0;
j=1;
if (ttm.tm_year >= 1980)
{
i=80;
j=2;
}
while (i < ttm.tm_year)
{
j += isLeapYear(i+1900) ? 2 : 1; /* shift 1 or 2 days each year */
if (j>6)
j -= 7;
i++;
}
ttm.tm_wday=(j + ttm.tm_yday) % 7; /* "day of year" helps us! */
}
/* ---- build calendar dates array ---- */
static void BuildDateArray(void)
{
int offset, dy=0;
memset(dys, 0, sizeof dys);
FixDate();
/* Compute the weekday for the 1st */
offset=((ttm.tm_mday-1) - ttm.tm_wday) % 7;
if (offset < 0)
offset += 7;
if (offset)
offset=(offset - 7) * -1;
/* Build the dates into the array */
for (dy=1; dy <= DyMo[ttm.tm_mon]; dy++)
dys[offset++]=dy;
}
static void CreateWindowMsg(WINDOW wnd)
{
int x, y;
DrawBox(wnd, 1, 2, CALHEIGHT-4, CALWIDTH-4);
for (x=5;x<CALWIDTH-4;x += 4)
DrawVector(wnd, x, 2, CALHEIGHT-4, FALSE);
for (y=4;y<CALHEIGHT-3;y+=2)
DrawVector(wnd, 1, y, CALWIDTH-4, TRUE);
}
static void DisplayDates(WINDOW wnd)
{
int week, day,offset;
char dyln[10],banner[CALWIDTH-1],banner1[30];
SetStandardColor(wnd);
PutWindowLine(wnd, "Sun Mon Tue Wed Thu Fri Sat", 2, 1);
memset(banner, ' ', CALWIDTH-2);
#ifndef strftime
sprintf(banner1, "%s, %i", nameOfMonth[ttm.tm_mon], 1900+ttm.tm_year);
#else
strftime(banner1, 16, "%B, %Y", &ttm);
#endif
offset=(CALWIDTH-2 - strlen(banner1)) / 2;
strcpy(banner+offset, banner1);
strcat(banner, " ");
PutWindowLine(wnd, banner, 0, 0);
BuildDateArray();
for (week=0;week<6;week++)
{
for (day=0;day<7;day++)
{
int dy=dys[week*7+day];
if (dy == 0)
strcpy(dyln, " ");
else
{
/* If current day of current month then highlight */
if ((dy == ctm.tm_mday) && (ctm.tm_mon == ttm.tm_mon))
sprintf(dyln, "%c%c%c%2d %c", CHANGECOLOR,
SelectForeground(wnd)+0x80,
SelectBackground(wnd)+0x80,
dy, RESETCOLOR);
else
sprintf(dyln, "%2d ", dy);
}
SetStandardColor(wnd);
PutWindowLine(wnd, dyln, 2 + day * 4, 3 + week*2);
}
}
}
static int KeyboardMsg(WINDOW wnd, PARAM p1)
{
switch ((int)p1)
{
case PGUP:
if (ttm.tm_mon == 0)
{
ttm.tm_mon=12;
ttm.tm_year--;
}
ttm.tm_mon--;
FixDate();
DisplayDates(wnd);
return TRUE;
case PGDN:
ttm.tm_mon++;
if (ttm.tm_mon == 12)
{
ttm.tm_mon=0;
ttm.tm_year++;
}
FixDate();
DisplayDates(wnd);
return TRUE;
default:
break;
}
return FALSE;
}
static int CalendarProc(WINDOW wnd,MESSAGE msg, PARAM p1,PARAM p2)
{
switch (msg)
{
case CREATE_WINDOW:
DefaultWndProc(wnd, msg, p1, p2);
CreateWindowMsg(wnd);
return TRUE;
case KEYBOARD:
if (KeyboardMsg(wnd, p1))
return TRUE;
break;
case PAINT:
DefaultWndProc(wnd, msg, p1, p2);
DisplayDates(wnd);
return TRUE;
case COMMAND:
if ((int)p1 == ID_HELP)
{
DisplayHelp(wnd, "Calendar");
return TRUE;
}
break;
case CLOSE_WINDOW:
Cwnd=NULL;
break;
default:
break;
}
return DefaultWndProc(wnd, msg, p1, p2);
}
void Calendar(WINDOW pwnd)
{
if (Cwnd == NULL)
{
time_t tim=time(NULL);
ttm=*localtime(&tim);
ctm=ttm; /* Store current calendar day and month */
Cwnd=CreateWindow(PICTUREBOX,"Calendar",-1,-1,CALHEIGHT,CALWIDTH,NULL,pwnd,CalendarProc,
SHADOW | MINMAXBOX | CONTROLBOX | MOVEABLE | HASBORDER);
}
SendMessage(Cwnd, SETFOCUS, TRUE, 0);
}
#endif
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