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/* getstr.cxx
$Id: getstr.cxx,v 1.12 2001/11/27 23:57:36 elf Exp $
written by Marc Singer
3 October 1996
This file is part of the project CurVeS. See the file README for
more information.
Copyright (C) 1996 Marc Singer
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
with your Debian GNU/Linux system, in
/usr/share/common-licenses/GPL, or with the Debian GNU/Linux hello
source package as the file COPYING. If not, write to the Free
Software Foundation, Inc., 59 Temple Place -Suite 330, MA
02111-1307, USA.
-----------
DESCRIPTION
-----------
User input function(s) for well protected interactions with the user.
*/
#include "std.h"
#include "window.h"
#include "termcap.h"
/* LWindow::getstr
fetches a string from the user in a nice, emacs sort of way. The
return valuse is zero if the user input is accepted. It is !0 if
the user pressed escape.
*/
int LWindow::getstr (int x, int y, char* szPrompt,
char* szResponse, int cchResponseMax,
const char* szDefault)
{
if (szDefault) {
if (szResponse != szDefault)
strcpy (szResponse, szDefault);
}
else
*szResponse = 0;
off (A_REVERSE);
printfxy (x, y, szPrompt);
x += strlen (szPrompt);
int ibSelect = 0, cbSelect = strlen (szResponse);
on (A_REVERSE);
printfxy (x, y, szResponse);
off (A_REVERSE);
int point = 0;
int cch = strlen (szResponse);
int ch;
int scroll = 0;
int scrollDelta = (dx () - x)/2;
int scrollZone = 10;
while ((ch = getch (point + x - scroll, y)) != '\n') {
switch (ch) {
case -1: // Getstr happening off screen
assert_ (ch != -1);
break;
case 27: // ESC
case 7: // ^G -- abort
return -1;
case 1: // ^A -- beginning of line
point = 0;
cbSelect = 0;
break;
case 5: // ^E -- end of line
point = cch;
cbSelect = 0;
break;
case 4: // ^D -- delete
case KEYCODE (termcapKeyDelete):
if (point < cch) {
memmove (szResponse + point, szResponse + point + 1,
cch - point);
--cch;
}
break;
case 8: // ^H -- backspace
case KEYCODE (termcapKeyBackspace):
if (cbSelect) {
*szResponse = 0;
cbSelect = 0;
point = 0;
cch = 0;
}
else if (point) {
memmove (szResponse + point - 1, szResponse + point,
cch - point + 1);
--point;
--cch;
}
break;
case 11: // ^K -- delete to end of line
if (cbSelect) {
memmove (szResponse + ibSelect,
szResponse + ibSelect + cbSelect,
cch - ibSelect - cbSelect + 1);
cch -= cbSelect;
point = ibSelect;
cbSelect = 0;
}
else {
szResponse[point] = 0;
cch = point;
}
break;
case 2: // ^B -- backward character
case KEYCODE (termcapKeyLeft):
if (point)
--point;
cbSelect = 0;
break;
case 6: // ^F -- forward character
case KEYCODE (termcapKeyRight):
if (point < cch)
++point;
cbSelect = 0;
break;
default:
if (isprint (ch)) {
if (cbSelect) { // Replace selection
memmove (szResponse + ibSelect + 1,
szResponse + ibSelect + cbSelect,
cch - ibSelect - cbSelect + 1);
cch -= cbSelect;
point = ibSelect;
cbSelect = 0;
}
else {
if (cch >= cchResponseMax - 1) // Leave room for nul, right?
continue; // FIXME: how about a beep here
if (point != cch)
memmove (szResponse + point + 1, szResponse + point,
cch - point + 1);
else {
assert_ (point < cchResponseMax - 1);
szResponse[point + 1] = 0;
}
}
szResponse[point++] = ch;
++cch;
}
break; // FIXME: how about a beep on bad input
}
// FIXME: We need to break-up the display so we show the
// highlighted portion AND the unhighlighted portion.
if (cbSelect)
on (A_REVERSE);
else
off (A_REVERSE);
// Check for scroll changes
while (point - scroll >= dx () - x)
scroll += scrollDelta;
while (scroll && point < scroll + scrollZone)
scroll -= scrollDelta;
printfxy (x, y, "%-*.*s", dx () - x, dx () - x, szResponse + scroll);
if (cbSelect)
off (A_REVERSE);
}
return 0;
}
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