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- /*
- * 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);
- }
-