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window.c
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C/C++ Source or Header
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1994-01-30
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13KB
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577 lines
/*
* Window handling.
*/
#include "def.h"
bool mvupwind ();
bool shrinkwind ();
extern char MSG_no_splt[];
extern char MSG_cnt_al_w[];
extern char MSG_one_w[];
extern char MSG_imp_chg[];
extern char MSG_scrn_rows[];
extern char MSG_bad_num[];
/*
* Reposition the window so as to center on the dot.
*/
bool
reposition ()
{
long l_val;
l_val = DOT_POS (curwp) - (curwp->w_ntrows * R_BYTES (curwp) / 2L);
move_ptr (curwp, l_val, FALSE, TRUE, FALSE);
curwp->w_flag |= WFHARD;
return (TRUE);
}
/*
* The command make the next
* window (next => down the screen)
* the current window. There are no real
* errors, although the command does
* nothing if there is only 1 window on
* the screen.
*/
bool
nextwind ()
{
register WINDOW *wp;
if ((wp = curwp->w_wndp) == NULL)
wp = wheadp;
curwp = wp;
curbp = wp->w_bufp;
return (TRUE);
}
/*
* This command makes the previous
* window (previous => up the screen) the
* current window. There arn't any errors,
* although the command does not do a lot
* if there is 1 window.
*/
bool
prevwind ()
{
register WINDOW *wp1;
register WINDOW *wp2;
wp1 = wheadp;
wp2 = curwp;
if (wp1 == wp2)
wp2 = NULL;
while (wp1->w_wndp != wp2)
wp1 = wp1->w_wndp;
curwp = wp1;
curbp = wp1->w_bufp;
return (TRUE);
}
/*
* This command moves the current
* window down by "arg" lines. Recompute
* the top line in the window. The move up and
* move down code is almost completely the same;
* most of the work has to do with reframing the
* window, and picking a new dot. We share the
* code by having "move down" just be an interface
* to "move up".
*/
bool
mvdnwind (f, n, k)
int f, n, k;
{
return (mvupwind (f, -n, KRANDOM));
}
/*
* Move the current window up by "arg"
* lines. Recompute the new top line of the window.
* Look to see if "." is still on the screen. If it is,
* you win. If it isn't, then move "." to center it
* in the new framing of the window (this command does
* not really move "."; it moves the frame).
*/
bool
mvupwind (f, n, k)
int f, n, k;
{
A32 l_val, l_bytes;
l_bytes = (A32) R_BYTES (curwp); /* number of bytes in a row */
l_val = n * l_bytes; /* number of bytes to move */
move_ptr (curwp, l_val, FALSE, TRUE, TRUE); /* move window */
/* check that dot is in window */
while (DOT_POS (curwp) < WIND_POS (curwp))
{
/* dot is before the first window line */
move_ptr (curwp, l_bytes, TRUE, TRUE, TRUE);
}
while (DOT_POS (curwp) >=
((l_bytes * curwp->w_ntrows) + WIND_POS (curwp)))
{
/* dot is after the last window line */
move_ptr (curwp, -l_bytes, TRUE, TRUE, TRUE);
}
curwp->w_flag |= WFHARD;
return (TRUE);
}
/*
* This command makes the current
* window the only window on the screen.
* Try to set the framing
* so that "." does not have to move on
* the display. Some care has to be taken
* to keep the values of dot and mark
* in the buffer structures right if the
* distruction of a window makes a buffer
* become undisplayed.
*/
bool
onlywind ()
{
register WINDOW *wp;
register LINE *lp;
register int i;
while (wheadp != curwp)
{
wp = wheadp;
wheadp = wp->w_wndp;
if (--wp->w_bufp->b_nwnd == 0)
{
wp->w_bufp->b_dotp = wp->w_dotp;
wp->w_bufp->b_doto = wp->w_doto;
wp->w_bufp->b_markp = wp->w_markp;
wp->w_bufp->b_marko = wp->w_marko;
}
free ((char *) wp);
}
while (curwp->w_wndp != NULL)
{
wp = curwp->w_wndp;
curwp->w_wndp = wp->w_wndp;
if (--wp->w_bufp->b_nwnd == 0)
{
wp->w_bufp->b_dotp = wp->w_dotp;
wp->w_bufp->b_doto = wp->w_doto;
wp->w_bufp->b_markp = wp->w_markp;
wp->w_bufp->b_marko = wp->w_marko;
}
free ((char *) wp);
}
lp = curwp->w_linep;
i = curwp->w_toprow;
while (i != 0 && lback (lp) != curbp->b_linep)
{
--i;
lp = lback (lp);
}
curwp->w_toprow = 0;
curwp->w_ntrows = nrow - 2; /* 2 = mode, echo. */
curwp->w_linep = lp;
curwp->w_flag |= WFMODE | WFHARD;
return (TRUE);
}
/*
* Delete the current window, placing its space in the window above,
* or, if it is the top window, the window below. Bound to C-X 0.
*/
bool
delwind ()
{
register WINDOW *wp; /* window to recieve deleted space */
register WINDOW *lwp; /* ptr window before curwp */
register int target; /* target line to search for */
/* if there is only one window, don't delete it */
if (wheadp->w_wndp == NULL)
{
return (FALSE);
}
/* find window before curwp in linked list */
wp = wheadp;
lwp = NULL;
while (wp != NULL)
{
if (wp == curwp)
break;
lwp = wp;
wp = wp->w_wndp;
}
/* find recieving window and give up our space */
wp = wheadp;
if (curwp->w_toprow == 0)
{
/* find the next window down */
target = curwp->w_ntrows + 1;
while (wp != NULL)
{
if (wp->w_toprow == target)
break;
wp = wp->w_wndp;
}
if (wp == NULL)
return (FALSE);
wp->w_toprow = 0;
wp->w_ntrows += target;
}
else
{
/* find the next window up */
target = curwp->w_toprow - 1;
while (wp != NULL)
{
if ((wp->w_toprow + wp->w_ntrows) == target)
break;
wp = wp->w_wndp;
}
if (wp == NULL)
return (FALSE);
wp->w_ntrows += 1 + curwp->w_ntrows;
}
/* get rid of the current window */
if (--curwp->w_bufp->b_nwnd == 0)
{
curwp->w_bufp->b_dotp = curwp->w_dotp;
curwp->w_bufp->b_doto = curwp->w_doto;
curwp->w_bufp->b_markp = curwp->w_markp;
curwp->w_bufp->b_marko = curwp->w_marko;
}
if (lwp == NULL)
wheadp = curwp->w_wndp;
else
lwp->w_wndp = curwp->w_wndp;
free ((char *) curwp);
curwp = wp;
wp->w_flag |= WFMODE | WFHARD;
curbp = wp->w_bufp;
return (TRUE);
}
/*
* Split the current window. A window
* smaller than 3 lines cannot be split.
* The only other error that is possible is
* a "malloc" failure allocating the structure
* for the new window.
*/
bool
splitwind ()
{
register WINDOW *wp;
register int ntru;
register int ntrl;
register int ntrd;
register WINDOW *wp1;
register WINDOW *wp2;
char buf[NCOL], buf1[NCOL];
if (curwp->w_ntrows < MIN_WIN_ROWS)
{
sprintf (buf1, MSG_no_splt, R_BYTE_FMT (curwp));
sprintf (buf, buf1, curwp->w_ntrows);
writ_echo (buf);
return (FALSE);
}
if ((wp = (WINDOW *) malloc (sizeof (WINDOW))) == NULL)
{
err_echo (MSG_cnt_al_w);
return (FALSE);
}
++curbp->b_nwnd; /* Displayed twice. */
wp->w_bufp = curbp;
wp->w_dotp = curwp->w_dotp;
wp->w_doto = curwp->w_doto;
wp->w_unit_offset = curwp->w_unit_offset;
wp->w_markp = curwp->w_markp;
wp->w_marko = curwp->w_marko;
wp->w_flag = 0;
wp->w_disp_shift = curwp->w_disp_shift;
wp->w_intel_mode = curwp->w_intel_mode;
wp->w_fmt_ptr = curwp->w_fmt_ptr;
ntru = (curwp->w_ntrows - 1) / 2; /* Upper size */
ntrl = (curwp->w_ntrows - 1) - ntru; /* Lower size */
curwp->w_ntrows = ntru;
wp->w_wndp = curwp->w_wndp;
curwp->w_wndp = wp;
wp->w_toprow = curwp->w_toprow + ntru + 1;
wp->w_ntrows = ntrl;
wind_on_dot (curwp); /* put window on the dot */
wp->w_loff = curwp->w_loff; /* do the same for the new window */
wp->w_linep = curwp->w_linep;
curwp->w_flag |= WFMODE | WFHARD;
wp->w_flag |= WFMODE | WFHARD;
return (TRUE);
}
/*
* Enlarge the current window.
* Find the window that loses space. Make
* sure it is big enough. If so, hack the window
* descriptions, and ask redisplay to do all the
* hard work. You don't just set "force reframe"
* because dot would move.
*/
bool
enlargewind (f, n, k)
int f, n, k;
{
register WINDOW *adjwp;
register LINE *lp;
register int i;
if (n < 0)
return (shrinkwind (f, -n, KRANDOM));
if (wheadp->w_wndp == NULL)
{
writ_echo (MSG_one_w);
return (FALSE);
}
if ((adjwp = curwp->w_wndp) == NULL)
{
adjwp = wheadp;
while (adjwp->w_wndp != curwp)
adjwp = adjwp->w_wndp;
}
if (adjwp->w_ntrows <= n)
{
writ_echo (MSG_imp_chg);
return (FALSE);
}
if (curwp->w_wndp == adjwp)
{
/* Shrink below. */
lp = adjwp->w_linep;
for (i = 0; i < n && lp != adjwp->w_bufp->b_linep; ++i)
lp = lforw (lp);
adjwp->w_linep = lp;
adjwp->w_toprow += n;
}
else
{
/* Shrink above. */
lp = curwp->w_linep;
for (i = 0; i < n && lback (lp) != curbp->b_linep; ++i)
lp = lback (lp);
curwp->w_linep = lp;
curwp->w_toprow -= n;
}
curwp->w_ntrows += n;
adjwp->w_ntrows -= n;
curwp->w_flag |= WFMODE | WFHARD;
adjwp->w_flag |= WFMODE | WFHARD;
return (TRUE);
}
/*
* Shrink the current window.
* Find the window that gains space. Hack at
* the window descriptions. Ask the redisplay to
* do all the hard work.
*/
bool
shrinkwind (f, n, k)
int f, n, k;
{
register WINDOW *adjwp;
register LINE *lp;
register int i;
if (n < 0)
return (enlargewind (f, -n, KRANDOM));
if (wheadp->w_wndp == NULL)
{
writ_echo (MSG_one_w);
return (FALSE);
}
if ((adjwp = curwp->w_wndp) == NULL)
{
adjwp = wheadp;
while (adjwp->w_wndp != curwp)
adjwp = adjwp->w_wndp;
}
if (curwp->w_ntrows <= n)
{
writ_echo (MSG_imp_chg);
return (FALSE);
}
if (curwp->w_wndp == adjwp)
{
/* Grow below. */
lp = adjwp->w_linep;
for (i = 0; i < n && lback (lp) != adjwp->w_bufp->b_linep; ++i)
lp = lback (lp);
adjwp->w_linep = lp;
adjwp->w_toprow -= n;
}
else
{
/* Grow above. */
lp = curwp->w_linep;
for (i = 0; i < n && lp != curbp->b_linep; ++i)
lp = lforw (lp);
curwp->w_linep = lp;
curwp->w_toprow += n;
}
curwp->w_ntrows -= n;
adjwp->w_ntrows += n;
curwp->w_flag |= WFMODE | WFHARD;
adjwp->w_flag |= WFMODE | WFHARD;
return (TRUE);
}
/*
* Pick a window for a pop-up.
* Split the screen if there is only
* one window. Pick the uppermost window that
* isn't the current window. An LRU algorithm
* might be better. Return a pointer, or
* NULL on error.
*/
WINDOW *
wpopup ()
{
register WINDOW *wp;
if (wheadp->w_wndp == NULL
&& splitwind () == FALSE)
return (NULL);
wp = wheadp; /* Find window to use */
while (wp != NULL && wp == curwp)
wp = wp->w_wndp;
return (wp);
}
/*
* Refresh the display.
* In the normal case the
* call to "update" in "main.c" refreshes the screen,
* and all of the windows need not be recomputed.
*/
bool
refresh ()
{
sgarbf = TRUE;
return (TRUE);
}
/* pvr
* Set the number of rows on the screen.
* This sets the nrow value and fixes up the windows
* to account for the new size.
*/
bool
screen_rows (f, n, k)
int f, n, k;
{
int new_rows;
register int s;
char buf[80];
WINDOW *wp, *cur_wp_sav;
cur_wp_sav = curwp;
new_rows = nrow; /* default it if sscanf reads nothing */
sprintf (buf, "%s [%d] ", MSG_scrn_rows, nrow);
if (f == FALSE)
{
if ((s = ereply (buf, buf, sizeof (buf), 0) != TRUE))
return (s);
sscanf (buf, "%d", &new_rows);
}
else
new_rows = n;
if (new_rows <= MIN_WIN_ROWS)
{
writ_echo (MSG_bad_num);
return (FALSE);
}
ttmove (0, 0);
tteeop ();
refresh ();
/* set new nrow value */
nrow = new_rows;
while (TRUE)
{
/* find last window */
for (wp = wheadp; wp->w_wndp; wp = wp->w_wndp)
wp->w_flag |= WFHARD; /* update all windows */
wp->w_flag |= WFHARD; /* update last windows */
/* if no part of window can fit, kill it */
if ((wp->w_toprow + MIN_WIN_ROWS) >= new_rows)
{
/* don't kill last window */
if (wp == wheadp)
{
nrow = MIN_WIN_ROWS + 2; /* set min size */
wp->w_ntrows = MIN_WIN_ROWS;
wind_on_dot (wp);
break;
}
curwp = wp;
curbp = wp->w_bufp;
delwind ();
}
else
{
/* adjust window to fit */
wp->w_ntrows = new_rows - wp->w_toprow - 2;
wind_on_dot (wp);
break;
}
}
/* free up old screen memory */
vtfree ();
/* recreate scerrn buffers */
vtinit ();
eerase (); /* clean up prompt line */
return (TRUE);
}