456 lines
12 KiB
C
456 lines
12 KiB
C
/* $XTermId: cursor.c,v 1.69 2013/08/08 08:16:40 tom Exp $ */
|
|
|
|
/*
|
|
* Copyright 2002-2012,2013 by Thomas E. Dickey
|
|
*
|
|
* All Rights Reserved
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Except as contained in this notice, the name(s) of the above copyright
|
|
* holders shall not be used in advertising or otherwise to promote the
|
|
* sale, use or other dealings in this Software without prior written
|
|
* authorization.
|
|
*
|
|
* 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>
|
|
#include <menu.h>
|
|
|
|
#include <assert.h>
|
|
|
|
/*
|
|
* 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(TScreen * screen, int row, int col, unsigned flags)
|
|
{
|
|
int use_row = row;
|
|
int use_col = col;
|
|
int max_col = screen->max_col;
|
|
int max_row = screen->max_row;
|
|
|
|
if (flags & ORIGIN) {
|
|
use_col += screen->lft_marg;
|
|
max_col = screen->rgt_marg;
|
|
}
|
|
use_col = (use_col < 0 ? 0 : use_col);
|
|
set_cur_col(screen, (use_col <= max_col ? use_col : max_col));
|
|
|
|
if (flags & ORIGIN) {
|
|
use_row += screen->top_marg;
|
|
max_row = screen->bot_marg;
|
|
}
|
|
use_row = (use_row < 0 ? 0 : use_row);
|
|
set_cur_row(screen, (use_row <= max_row ? use_row : max_row));
|
|
|
|
ResetWrap(screen);
|
|
|
|
TRACE(("CursorSet(%d,%d) margins V[%d..%d] H[%d..%d] -> %d,%d %s\n",
|
|
row, col,
|
|
screen->top_marg,
|
|
screen->bot_marg,
|
|
screen->lft_marg,
|
|
screen->rgt_marg,
|
|
screen->cur_row,
|
|
screen->cur_col,
|
|
(flags & ORIGIN ? "origin" : "normal")));
|
|
}
|
|
|
|
/*
|
|
* moves the cursor left n, no wrap around
|
|
*/
|
|
void
|
|
CursorBack(XtermWidget xw, int n)
|
|
{
|
|
#define WRAP_MASK (REVERSEWRAP | WRAPAROUND)
|
|
TScreen *screen = TScreenOf(xw);
|
|
int offset, in_row, length, rev;
|
|
int left = ScrnLeftMargin(xw);
|
|
int before = screen->cur_col;
|
|
|
|
if ((rev = (xw->flags & WRAP_MASK) == WRAP_MASK) != 0
|
|
&& screen->do_wrap) {
|
|
n--;
|
|
}
|
|
|
|
/* if the cursor is already before the left-margin, we have to let it go */
|
|
if (before < left)
|
|
left = 0;
|
|
|
|
if ((screen->cur_col -= n) < left) {
|
|
if (rev) {
|
|
in_row = ScrnRightMargin(xw) - left + 1;
|
|
offset = (in_row * screen->cur_row) + screen->cur_col - left;
|
|
if (offset < 0) {
|
|
length = in_row * MaxRows(screen);
|
|
offset += ((-offset) / length + 1) * length;
|
|
}
|
|
set_cur_row(screen, (offset / in_row));
|
|
set_cur_col(screen, (offset % in_row) + left);
|
|
do_xevents();
|
|
} else {
|
|
set_cur_col(screen, left);
|
|
}
|
|
}
|
|
ResetWrap(screen);
|
|
}
|
|
|
|
/*
|
|
* moves the cursor forward n, no wraparound
|
|
*/
|
|
void
|
|
CursorForward(XtermWidget xw, int n)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
#if OPT_DEC_CHRSET
|
|
LineData *ld = getLineData(screen, screen->cur_row);
|
|
#endif
|
|
int next = screen->cur_col + n;
|
|
int max;
|
|
|
|
if (IsLeftRightMode(xw)) {
|
|
max = screen->rgt_marg;
|
|
if (screen->cur_col > max)
|
|
max = screen->max_col;
|
|
} else {
|
|
max = LineMaxCol(screen, ld);
|
|
}
|
|
|
|
if (next > max)
|
|
next = max;
|
|
|
|
set_cur_col(screen, next);
|
|
ResetWrap(screen);
|
|
}
|
|
|
|
/*
|
|
* moves the cursor down n, no scrolling.
|
|
* Won't pass bottom margin or bottom of screen.
|
|
*/
|
|
void
|
|
CursorDown(TScreen * screen, int n)
|
|
{
|
|
int max;
|
|
int next = screen->cur_row + n;
|
|
|
|
max = (screen->cur_row > screen->bot_marg ?
|
|
screen->max_row : screen->bot_marg);
|
|
if (next > max)
|
|
next = max;
|
|
if (next > screen->max_row)
|
|
next = screen->max_row;
|
|
|
|
set_cur_row(screen, next);
|
|
ResetWrap(screen);
|
|
}
|
|
|
|
/*
|
|
* moves the cursor up n, no linestarving.
|
|
* Won't pass top margin or top of screen.
|
|
*/
|
|
void
|
|
CursorUp(TScreen * screen, int n)
|
|
{
|
|
int min;
|
|
int next = screen->cur_row - n;
|
|
|
|
min = ((screen->cur_row < screen->top_marg)
|
|
? 0
|
|
: screen->top_marg);
|
|
if (next < min)
|
|
next = min;
|
|
if (next < 0)
|
|
next = 0;
|
|
|
|
set_cur_row(screen, next);
|
|
ResetWrap(screen);
|
|
}
|
|
|
|
/*
|
|
* Moves cursor down amount lines, scrolls if necessary.
|
|
* Won't leave scrolling region. No carriage return.
|
|
*/
|
|
void
|
|
xtermIndex(XtermWidget xw, int amount)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
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
|
|
|| (IsLeftRightMode(xw)
|
|
&& !ScrnIsColInMargins(screen, screen->cur_col))) {
|
|
CursorDown(screen, amount);
|
|
} else {
|
|
CursorDown(screen, j = screen->bot_marg - screen->cur_row);
|
|
xtermScroll(xw, amount - j);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Moves cursor up amount lines, reverse scrolls if necessary.
|
|
* Won't leave scrolling region. No carriage return.
|
|
*/
|
|
void
|
|
RevIndex(XtermWidget xw, int amount)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
|
|
/*
|
|
* 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
|
|
|| (IsLeftRightMode(xw)
|
|
&& !ScrnIsColInMargins(screen, screen->cur_col))) {
|
|
CursorUp(screen, amount);
|
|
} else {
|
|
RevScroll(xw, 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(XtermWidget xw)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
int left = ScrnLeftMargin(xw);
|
|
int col;
|
|
|
|
if (xw->flags & ORIGIN) {
|
|
col = left;
|
|
} else if (screen->cur_col >= left) {
|
|
col = left;
|
|
} else {
|
|
/*
|
|
* If origin-mode is not active, it is possible to use cursor
|
|
* addressing outside the margins. In that case we will go to the
|
|
* first column rather than following the margin.
|
|
*/
|
|
col = 0;
|
|
}
|
|
|
|
set_cur_col(screen, col);
|
|
ResetWrap(screen);
|
|
do_xevents();
|
|
}
|
|
|
|
/*
|
|
* When resizing the window, if we're showing the alternate screen, we still
|
|
* have to adjust the saved cursor from the normal screen to account for
|
|
* shifting of the saved-line region in/out of the viewable window.
|
|
*/
|
|
void
|
|
AdjustSavedCursor(XtermWidget xw, int adjust)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
|
|
if (screen->whichBuf) {
|
|
SavedCursor *sc = &screen->sc[0];
|
|
|
|
if (adjust > 0) {
|
|
TRACE(("AdjustSavedCursor %d -> %d\n", sc->row, sc->row - adjust));
|
|
sc->row += adjust;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Save Cursor and Attributes
|
|
*/
|
|
void
|
|
CursorSave(XtermWidget xw)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
SavedCursor *sc = &screen->sc[screen->whichBuf];
|
|
|
|
sc->saved = True;
|
|
sc->row = screen->cur_row;
|
|
sc->col = screen->cur_col;
|
|
sc->flags = xw->flags;
|
|
sc->curgl = screen->curgl;
|
|
sc->curgr = screen->curgr;
|
|
#if OPT_ISO_COLORS
|
|
sc->cur_foreground = xw->cur_foreground;
|
|
sc->cur_background = xw->cur_background;
|
|
sc->sgr_foreground = xw->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(XtermWidget xw)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
SavedCursor *sc = &screen->sc[screen->whichBuf];
|
|
|
|
/* 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);
|
|
}
|
|
|
|
UIntClr(xw->flags, DECSC_FLAGS);
|
|
UIntSet(xw->flags, sc->flags & DECSC_FLAGS);
|
|
CursorSet(screen,
|
|
((xw->flags & ORIGIN)
|
|
? sc->row - screen->top_marg
|
|
: sc->row),
|
|
sc->col, xw->flags);
|
|
|
|
#if OPT_ISO_COLORS
|
|
xw->sgr_foreground = sc->sgr_foreground;
|
|
SGR_Foreground(xw, xw->flags & FG_COLOR ? sc->cur_foreground : -1);
|
|
SGR_Background(xw, xw->flags & BG_COLOR ? sc->cur_background : -1);
|
|
#endif
|
|
update_autowrap();
|
|
}
|
|
|
|
/*
|
|
* Move the cursor to the first column of the n-th next line.
|
|
*/
|
|
void
|
|
CursorNextLine(XtermWidget xw, int count)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
|
|
CursorDown(screen, count < 1 ? 1 : count);
|
|
CarriageReturn(xw);
|
|
do_xevents();
|
|
}
|
|
|
|
/*
|
|
* Move the cursor to the first column of the n-th previous line.
|
|
*/
|
|
void
|
|
CursorPrevLine(XtermWidget xw, int count)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
|
|
CursorUp(screen, count < 1 ? 1 : count);
|
|
CarriageReturn(xw);
|
|
do_xevents();
|
|
}
|
|
|
|
/*
|
|
* Return col/row values which can be passed to CursorSet() preserving the
|
|
* current col/row, e.g., accounting for DECOM.
|
|
*/
|
|
int
|
|
CursorCol(XtermWidget xw)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
int result = screen->cur_col;
|
|
if (xw->flags & ORIGIN) {
|
|
result -= ScrnLeftMargin(xw);
|
|
if (result < 0)
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
int
|
|
CursorRow(XtermWidget xw)
|
|
{
|
|
TScreen *screen = TScreenOf(xw);
|
|
int result = screen->cur_row;
|
|
if (xw->flags & ORIGIN) {
|
|
result -= screen->top_marg;
|
|
if (result < 0)
|
|
result = 0;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#if OPT_TRACE
|
|
int
|
|
set_cur_row(TScreen * screen, int value)
|
|
{
|
|
TRACE(("set_cur_row %d vs %d\n", value, screen ? screen->max_row : -1));
|
|
|
|
assert(screen != 0);
|
|
assert(value >= 0);
|
|
assert(value <= screen->max_row);
|
|
screen->cur_row = value;
|
|
return value;
|
|
}
|
|
|
|
int
|
|
set_cur_col(TScreen * screen, int value)
|
|
{
|
|
TRACE(("set_cur_col %d vs %d\n", value, screen ? screen->max_col : -1));
|
|
|
|
assert(screen != 0);
|
|
assert(value >= 0);
|
|
assert(value <= screen->max_col);
|
|
screen->cur_col = value;
|
|
return value;
|
|
}
|
|
#endif /* OPT_TRACE */
|