211 lines
3.5 KiB
C
211 lines
3.5 KiB
C
/* move4.c */
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/* Author:
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* Steve Kirkendall
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* 14407 SW Teal Blvd. #C
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* Beaverton, OR 97005
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* kirkenda@cs.pdx.edu
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*/
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/* This file contains movement functions which are screen-relative */
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#include "config.h"
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#include "vi.h"
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/* This moves the cursor to a particular row on the screen */
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/*ARGSUSED*/
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MARK m_row(m, cnt, key)
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MARK m; /* the cursor position */
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long cnt; /* the row we'll move to */
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int key; /* the keystroke of this move - H/L/M */
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{
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DEFAULT(1);
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/* calculate destination line based on key */
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cnt--;
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switch (key)
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{
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case 'H':
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cnt = topline + cnt;
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break;
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case 'M':
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cnt = topline + (LINES - 1) / 2;
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break;
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case 'L':
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cnt = botline - cnt;
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break;
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}
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/* return the mark of the destination line */
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return MARK_AT_LINE(cnt);
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}
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/* This function repositions the current line to show on a given row */
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MARK m_z(m, cnt, key)
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MARK m; /* the cursor */
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long cnt; /* the line number we're repositioning */
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int key; /* key struck after the z */
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{
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long newtop;
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int i;
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/* Which line are we talking about? */
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if (cnt < 0 || cnt > nlines)
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{
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return MARK_UNSET;
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}
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if (cnt)
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{
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m = MARK_AT_LINE(cnt);
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newtop = cnt;
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}
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else
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{
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newtop = markline(m);
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}
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/* allow a "window size" number to be entered */
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for (i = 0; key >= '0' && key <= '9'; key = getkey(0))
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{
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i = i * 10 + key - '0';
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}
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#ifndef CRUNCH
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if (i > 0 && i <= LINES - 1)
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{
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*o_window = i;
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wset = TRUE;
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}
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#else
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/* the number is ignored if -DCRUNCH */
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#endif
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/* figure out which line will have to be at the top of the screen */
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switch (key)
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{
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case '\n':
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#if OSK
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case '\l':
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#else
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case '\r':
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#endif
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case '+':
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break;
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case '.':
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case 'z':
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newtop -= LINES / 2;
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break;
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case '-':
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newtop -= LINES - 1;
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break;
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default:
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return MARK_UNSET;
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}
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/* make the new topline take effect */
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redraw(MARK_UNSET, FALSE);
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if (newtop >= 1)
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{
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topline = newtop;
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}
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else
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{
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topline = 1L;
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}
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redrawrange(0L, INFINITY, INFINITY);
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/* The cursor doesn't move */
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return m;
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}
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/* This function scrolls the screen. It does this by calling redraw() with
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* an off-screen line as the argument. It will move the cursor if necessary
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* so that the cursor is on the new screen.
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*/
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/*ARGSUSED*/
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MARK m_scroll(m, cnt, key)
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MARK m; /* the cursor position */
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long cnt; /* for some keys: the number of lines to scroll */
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int key; /* keystroke that causes this movement */
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{
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MARK tmp; /* a temporary mark, used as arg to redraw() */
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/* adjust cnt, and maybe *o_scroll, depending of key */
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switch (key)
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{
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case ctrl('F'):
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case ctrl('B'):
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DEFAULT(1);
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redrawrange(0L, INFINITY, INFINITY); /* force complete redraw */
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cnt = cnt * (LINES - 1) - 2; /* keeps two old lines on screen */
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break;
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case ctrl('E'):
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case ctrl('Y'):
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DEFAULT(1);
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break;
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case ctrl('U'):
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case ctrl('D'):
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if (cnt == 0) /* default */
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{
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cnt = *o_scroll;
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}
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else
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{
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if (cnt > LINES - 1)
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{
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cnt = LINES - 1;
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}
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*o_scroll = cnt;
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}
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break;
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}
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/* scroll up or down, depending on key */
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switch (key)
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{
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case ctrl('B'):
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case ctrl('Y'):
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case ctrl('U'):
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cnt = topline - cnt;
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if (cnt < 1L)
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{
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cnt = 1L;
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m = MARK_FIRST;
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}
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tmp = MARK_AT_LINE(cnt) + markidx(m);
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redraw(tmp, FALSE);
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if (markline(m) > botline)
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{
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m = MARK_AT_LINE(botline);
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}
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break;
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case ctrl('F'):
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case ctrl('E'):
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case ctrl('D'):
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cnt = botline + cnt;
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if (cnt > nlines)
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{
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cnt = nlines;
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m = MARK_LAST;
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}
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tmp = MARK_AT_LINE(cnt) + markidx(m);
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redraw(tmp, FALSE);
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if (markline(m) < topline)
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{
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m = MARK_AT_LINE(topline);
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}
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break;
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}
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return m;
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}
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