Searching for a working example of a curses application that resizes in xterm

[schwerdy]

Hi together,

can someone provide an example of a curses application that works in a
xterm that can be resized?

I could not find any working example yet...

Thanks in advance,
Sebastian 'Schwerdy' Schwerdhöfer

[Thomas Guettler]

Am Mon, 19 Sep 2005 03:40:38 -0700 schrieb schwerdy:

Hi together,

can someone provide an example of a curses application that works in a
xterm that can be resized?

I could not find any working example yet...

Hi,

You should find this in the C source of "mutt" or "less".

HTH,
Thomas
--
Thomas Güttler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de
Spam Catcher: ni************* *@thomas-guettler.de

[Fredrik Lundh]

sc******@web.de wrote:

can someone provide an example of a curses application that works in a
xterm that can be resized?

googling for "python sigwinch curses" brings up a considerable
number of related stuff, including

http://dbforums.com/archive/97/2002/07/4/439799

and

http://groups.google.com/group/comp....fa595d97e90040

and a couple of related bug reports and discussions about why
they're not bugs, plus the source code for a couple of curses-
based Python programs.

</F>

[Grant Edwards]

On 2005-09-19, sc******@web.de <sc******@web.d e> wrote:

can someone provide an example of a curses application that works in a
xterm that can be resized?

I'm afraid I can't post the entire program, but what you need
to do is to catch the WINCH signal and set a flag which is
checked by your main "event" loop and handled. Here's the
basic C code:

static void sigwinchHandler (int sig)
{
(void) sig;
sigwinchReceive d = 1;
}

static void clipWindows(voi d)
{
tCh *ch;
int x,y,rows,cols;

for (ch = chlist; ch != NULL; ch = ch->next)
{
getbegyx(ch->win,y,x);
getmaxyx(ch->win,rows,cols) ;
clipwin(&rows,& cols,&y,&x);
moveWindow(ch,r ows,cols,y,x);
}
}
main()
{
[...]
sigact.sa_handl er = sigwinchHandler ;
s = sigaction(SIGWI NCH, &sigact, NULL);
assert(s==0);
// start up curses
while (1)
{
// do stuff
if (sigwinchReceiv ed)
{
struct winsize size;
if (ioctl(fileno(s tdout), TIOCGWINSZ, &size) == 0)
{
resizeterm(size .ws_row, size.ws_col);
clipWindows();
}
sigwinchReceive d = 0;
}
}
}

--
Grant Edwards grante Yow! If I am elected no
at one will ever have to do
visi.com their laundry again!

[schwerdy]

Thanks, but I had already read these discussions (hope the grammar is
correct...), and thought I understood them. But my exact problem: If I
resize a xterm, in most cases curses prints crap (if it does not crash
python). And I could not find any python-curses application that is
displayed correctly after a terminal resize.

I hope nobody will kill me, 'cause I'm a spammer; here is my example:

------
import curses

def gettermres():
"""
returns the current terminal size in columns and lines
"""
import struct, fcntl, sys, termios
lines, cols = struct.unpack(" HHHH",
fcntl.ioctl(sys .stdout.fileno( ),termios.TIOCG WINSZ, struct.pack("HH HH",
0, 0, 0, 0)))[:2]
return cols, lines

def splitwin(scr, extend1, axis=0, isPercent=True,
useFullScreen=F alse):
"""
splits the scr in 2 windows and return both
extend1 is the size of the first window
axis=0 --> split horizontal
axis=1 --> split vertical
if isPercent is False, extend1 will be interpreted as absolut size
"""
if isPercent and not 0 < extend1 < 100:
raise "extend1 must be between 0 and 100"
if not axis in (0,1):
raise "axis must be 0 or 1"

if useFullScreen:
res = [0,0]
res[1], res[0] = gettermres()
pos = (0,0)
else:
res = scr.getmaxyx()
pos = scr.getbegyx()

size1 = list(res)
size2 = list(res)

if isPercent:
totallen = float(res[axis])
size1[axis] = int( totallen*extend 1 / 100 )
else:
size1[axis] = extend1

size2[axis] = res[axis] - size1[axis]
start1 = list(pos)
start2 = list(pos)
start2[axis] = size1[axis]

win1 = curses.newwin(s ize1[0], size1[1], start1[0], start1[1])
win2 = curses.newwin(s ize2[0], size2[1], start2[0], start2[1])

return win1, win2

def startcurses(std scr):
curses.use_defa ult_colors() # transparency
curses.init_pai r(2, curses.COLOR_GR EEN, -1)

while 1:
curses.setupter m()
winTop, winBottom = splitwin(stdscr , 80, useFullScreen=T rue)
winLeft, winRight = splitwin(winTop , 50, 1)
winLeft.border( )
winLeft.noutref resh()
winRight.border ()
winRight.addstr (1,1,"hallo", curses.color_pa ir(2))
winRight.noutre fresh()
winBottom.borde r()
winBottom.noutr efresh()
curses.doupdate ()
k = winLeft.getch()
if k == ord('q'):
break

curses.wrapper( startcurses)
------