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WINDOW.C
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C/C++ Source or Header
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1992-01-06
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11KB
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484 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[];
/*
* 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)
register 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 < 3)
{
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);
}