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cursor.c
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cursor.c
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/*
* $XConsortium: cursor.c,v 1.14 93/09/20 17:42:23 hersh Exp $
* $XFree86: xc/programs/xterm/cursor.c,v 3.13 2000/02/08 17:19:33 dawes Exp $
*/
/*
* Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of Digital Equipment
* Corporation not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
*
*
* DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* cursor.c */
#include <xterm.h>
#include <data.h>
/*
* Clear the selection if the cursor moves "before" the current position.
* Moving "after" is ok.
*
* That sounds fine - if the cursor really had anything direct relationship to
* the selection. For instance, if the cursor moved due to command line
* editing, it would be nice to deselect. However, what that means in practice
* is that a fullscreen program which scrolls back a line will (because it must
* temporarily reposition the cursor) clear the selection.
*
* However, it has an indirect relationship to the selection - we want to
* prevent the application from changing the screen contents under the
* highlighted region.
*/
#define _CheckSelection(screen) \
if ((screen->cur_row < screen->endHRow) || \
(screen->cur_row == screen->endHRow && \
screen->cur_col < screen->endHCol)) \
DisownSelection(term);
/*
* Moves the cursor to the specified position, checking for bounds.
* (this includes scrolling regions)
* The origin is considered to be 0, 0 for this procedure.
*/
void
CursorSet(register TScreen *screen, register int row, register int col, unsigned flags)
{
register int maxr;
col = (col < 0 ? 0 : col);
screen->cur_col = (col <= screen->max_col ? col : screen->max_col);
maxr = screen->max_row;
if (flags & ORIGIN) {
row += screen->top_marg;
maxr = screen->bot_marg;
}
row = (row < 0 ? 0 : row);
screen->cur_row = (row <= maxr ? row : maxr);
screen->do_wrap = 0;
_CheckSelection(screen);
}
/*
* moves the cursor left n, no wrap around
*/
void
CursorBack(register TScreen *screen, int n)
{
register int i, j, k, rev;
if((rev = (term->flags & (REVERSEWRAP | WRAPAROUND)) ==
(REVERSEWRAP | WRAPAROUND)) != 0
&& screen->do_wrap)
n--;
if ((screen->cur_col -= n) < 0) {
if(rev) {
if((i = (j = screen->max_col + 1) * screen->cur_row +
screen->cur_col) < 0) {
k = j * (screen->max_row + 1);
i += ((-i) / k + 1) * k;
}
screen->cur_row = i / j;
screen->cur_col = i % j;
} else
screen->cur_col = 0;
}
screen->do_wrap = 0;
_CheckSelection(screen);
}
/*
* moves the cursor forward n, no wraparound
*/
void
CursorForward(register TScreen *screen, int n)
{
screen->cur_col += n;
if (screen->cur_col > CurMaxCol(screen, screen->cur_row))
screen->cur_col = CurMaxCol(screen, screen->cur_row);
screen->do_wrap = 0;
_CheckSelection(screen);
}
/*
* moves the cursor down n, no scrolling.
* Won't pass bottom margin or bottom of screen.
*/
void
CursorDown(register TScreen *screen, int n)
{
register int max;
max = (screen->cur_row > screen->bot_marg ?
screen->max_row : screen->bot_marg);
screen->cur_row += n;
if (screen->cur_row > max)
screen->cur_row = max;
screen->do_wrap = 0;
_CheckSelection(screen);
}
/*
* moves the cursor up n, no linestarving.
* Won't pass top margin or top of screen.
*/
void
CursorUp(register TScreen *screen, int n)
{
register int min;
min = (screen->cur_row < screen->top_marg ?
0 : screen->top_marg);
screen->cur_row -= n;
if (screen->cur_row < min)
screen->cur_row = min;
screen->do_wrap = 0;
_CheckSelection(screen);
}
/*
* Moves cursor down amount lines, scrolls if necessary.
* Won't leave scrolling region. No carriage return.
*/
void
xtermIndex(register TScreen *screen, register int amount)
{
register int j;
/*
* indexing when below scrolling region is cursor down.
* if cursor high enough, no scrolling necessary.
*/
if (screen->cur_row > screen->bot_marg
|| screen->cur_row + amount <= screen->bot_marg) {
CursorDown(screen, amount);
return;
}
CursorDown(screen, j = screen->bot_marg - screen->cur_row);
xtermScroll(screen, amount - j);
}
/*
* Moves cursor up amount lines, reverse scrolls if necessary.
* Won't leave scrolling region. No carriage return.
*/
void
RevIndex(register TScreen *screen, register int amount)
{
/*
* reverse indexing when above scrolling region is cursor up.
* if cursor low enough, no reverse indexing needed
*/
if (screen->cur_row < screen->top_marg
|| screen->cur_row-amount >= screen->top_marg) {
CursorUp(screen, amount);
return;
}
RevScroll(screen, amount - (screen->cur_row - screen->top_marg));
CursorUp(screen, screen->cur_row - screen->top_marg);
}
/*
* Moves Cursor To First Column In Line
* (Note: xterm doesn't implement SLH, SLL which would affect use of this)
*/
void
CarriageReturn(register TScreen *screen)
{
screen->cur_col = 0;
screen->do_wrap = 0;
_CheckSelection(screen);
}
/*
* Save Cursor and Attributes
*/
void
CursorSave(register XtermWidget tw)
{
register TScreen *screen = &tw->screen;
register SavedCursor *sc = &screen->sc[screen->alternate != False];
sc->saved = True;
sc->row = screen->cur_row;
sc->col = screen->cur_col;
sc->flags = tw->flags;
sc->curgl = screen->curgl;
sc->curgr = screen->curgr;
#if OPT_ISO_COLORS
sc->cur_foreground = tw->cur_foreground;
sc->cur_background = tw->cur_background;
sc->sgr_foreground = tw->sgr_foreground;
#endif
memmove( sc->gsets, screen->gsets, sizeof(screen->gsets));
}
/*
* We save/restore all visible attributes, plus wrapping, origin mode, and the
* selective erase attribute.
*/
#define DECSC_FLAGS (ATTRIBUTES|ORIGIN|WRAPAROUND|PROTECTED)
/*
* Restore Cursor and Attributes
*/
void
CursorRestore(register XtermWidget tw)
{
register TScreen *screen = &tw->screen;
register SavedCursor *sc = &screen->sc[screen->alternate != False];
/* Restore the character sets, unless we never did a save-cursor op.
* In that case, we'll reset the character sets.
*/
if (sc->saved) {
memmove( screen->gsets, sc->gsets, sizeof(screen->gsets));
screen->curgl = sc->curgl;
screen->curgr = sc->curgr;
} else {
resetCharsets(screen);
}
tw->flags &= ~DECSC_FLAGS;
tw->flags |= sc->flags & DECSC_FLAGS;
CursorSet (screen,
(tw->flags & ORIGIN)
? sc->row - screen->top_marg
: sc->row,
sc->col, tw->flags);
#if OPT_ISO_COLORS
tw->sgr_foreground = sc->sgr_foreground;
SGR_Foreground(tw->flags & FG_COLOR ? sc->cur_foreground : -1);
SGR_Background(tw->flags & BG_COLOR ? sc->cur_background : -1);
#endif
}
/*
* Move the cursor to the first column of the n-th next line.
*/
void
CursorNextLine(TScreen *screen, int count)
{
CursorDown(screen, count < 1 ? 1 : count);
CarriageReturn(screen);
do_xevents();
}
/*
* Move the cursor to the first column of the n-th previous line.
*/
void
CursorPrevLine(TScreen *screen, int count)
{
CursorUp(screen, count < 1 ? 1 : count);
CarriageReturn(screen);
do_xevents();
}