pá 11. 2. 2022 v 11:07 odesílatel Thomas Dickey <
dickey@his.com> napsal:
On Fri, Feb 11, 2022 at 09:21:13AM +0100, Leon Winter wrote:
> Hi Pavel,
>
> this is how I do it:
>
> void ignore_handler (int)
> {
> }
well, you _can_ do that, but then (n)curses is of no use in optimizing the
screen after SIGWINCH.
In dialog, I re-layout the screen on reading KEY_RESIZE,
which works well enough.
I do the same thing. But you can see in your code too, so this feature increases complexity. If the resize handler doesn't change, then you don't need to store the original size in aux variables.
With the possibility to pin corners to left, right, upper, lower terminal borders then you don't need to do a lot of work in application.
But anyway, maybe I had a bigger problem with this feature, because it is not well described, or I badly searched.
Regards
Pavel
> // somewhere else before initscr ()
> struct sigaction ignore;
> memset (&ignore, 0, sizeof ignore);
> ignore.sa_handler = ignore_handler;
> sigaction (SIGWINCH, &ignore, 0);
>
> Regards,
> Leon
>
> On Fri, Feb 11, 2022 at 03:55:04AM +0100, Pavel Stehule wrote:
> > pá 11. 2. 2022 v 3:34 odesílatel Pavel Stehule <pavel.stehule@gmail.com>
> > napsal:
> >
> > >
> > >
> > > pá 11. 2. 2022 v 1:35 odesílatel Thomas Dickey <dickey@his.com> napsal:
> > >
> > >> On Thu, Feb 10, 2022 at 11:54:00AM +0100, Pavel Stehule wrote:
> > >> > Hi
> > >> >
> > >> > I found an interesting issue. When I resize the terminal, so some
> > >> windows
> > >> > are partially out of screen, the window size is reduced. From this
> > >> moment,
> > >> > the window lost original size, and the size of window is related to
> > >> size of
> > >> > screen.
> > >>
> > >> As I pointed out here:
> > >>
> > >> https://lists.gnu.org/archive/html/bug-ncurses/2020-08/msg00011.html
> > >>
> > >> windows don't extend outside the screen.
> > >>
> > >> When ncurses is handling SIGWINCH, it shrinks windows to fit in the
> > >> screen.
> > >>
> > >
> > >
> > Is it possible to disable this feature? Maybe in the future, by some
> > setting? I am author or pspg https://github.com/okbob/pspg
> >
> > and this feature was probably the biggest issue when I worked on it. The
> > user of pspg can resize the terminal at any moment. And after resizing I
> > need to recheck all windows if they are the correct size. I understand, so
> > the signal handler can shrink some windows, but what is strange, it can
> > extend some windows too. Maybe the shrinking can be replaced by some flags
> > that can be detected from applications like fully visible, partially
> > visible, invisible. But the size of the window can be immutable.
> >
> > Regards
> >
> > Pavel
> >
> >
> >
> > > ok
> > >
> > > Thank you for info
> > >
> > > Regards
> > >
> > > Pavel
> > >
> > >>
> > >> >
> > >> > It can be easy demonstrated by example:
> > >> >
> > >> > #include <ncurses.h>
> > >> >
> > >> > int
> > >> > main()
> > >> > {
> > >> > int c;
> > >> > WINDOW *win;
> > >> >
> > >> > initscr();
> > >> >
> > >> > clear();
> > >> > noecho();
> > >> > cbreak();
> > >> > curs_set(0);
> > >> > keypad(stdscr, TRUE);
> > >> >
> > >> > win = newwin(20, 40, 15,15);
> > >> >
> > >> > timeout(250);
> > >> >
> > >> > while (c != 'q')
> > >> > {
> > >> > int lines, cols;
> > >> >
> > >> > clear();
> > >> >
> > >> > /* termina size */
> > >> > mvprintw(10, 10, "terminal: %d, %d", LINES, COLS);
> > >> > clrtoeol();
> > >> >
> > >> > /* stdscr size */
> > >> > getmaxyx(stdscr, lines, cols);
> > >> > mvprintw(11, 10, "stdscr: %d, %d", lines, cols);
> > >> > clrtoeol();
> > >> >
> > >> > /* win size */
> > >> > getmaxyx(win, lines, cols);
> > >> > mvprintw(12, 10, "win: %d, %d", lines, cols);
> > >> > clrtoeol();
> > >> >
> > >> > refresh();
> > >> >
> > >> > wclear(win);
> > >> > box(win, 0,0);
> > >> > wrefresh(win);
> > >> >
> > >> > c = getch();
> > >> > }
> > >> >
> > >> > endwin();
> > >> > }
> > >> >
> > >> > when running, try to reduce terminal size to 20 lines, 40 cols. After
> > >> > increasing terminal size, the size of window win is increased too.
> > >> >
> > >> > What is the reason for this behaviour?
> > >> >
> > >> > Regards
> > >> >
> > >> > Pavel Stehule
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> --
> > >> Thomas E. Dickey <dickey@invisible-island.net>
> > >> https://invisible-island.net
> > >> ftp://ftp.invisible-island.net
> > >>
> > >
>
--
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net
ftp://ftp.invisible-island.net