Fwd: move_panel not working with pads
Giorgos Xou <[email protected]> Tue, 16 Jun 2026 05:42:46 +0300
| Newsgroups | gmane.comp.lib.ncurses.bugs |
|---|---|
| Message-ID | <CAG9dOf_tncsu5NH=GdDVGESu6Aw-xfOaKfThfJx3A0MdfEwQGQ@mail.gmail.com> |
--0000000000009db7d5065455e689 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable ---------- Forwarded message --------- From: Giorgos Xou <[email protected]> Date: Tue, Jun 16, 2026 at 4:35=E2=80=AFAM Subject: Re: move_panel not working with pads To: Thomas Dickey <[email protected]> On Mon, Jun 15, 2026 at 07:11:11PM -0400, Thomas Dickey wrote: > On Mon, Jun 15, 2026 at 06:12:27PM -0400, Bill Gray wrote: > > On 6/15/26 16:56, Thomas Dickey wrote: > > > On Mon, Jun 15, 2026 at 02:57:45PM -0400, Bill Gray wrote: > > > > Hmmm... please post the test code you're using for this? Have you tried > > > > it with PDCursesMod? (Its panel library is a near-total rewrite, but its > > > > move_panel() does use mvwin() internally.) No, I haven't tested it against PDCursesMod nor PDCurses, it was just a speculation considering it uses mvwin internally too. > > > > > > yes... a test-program is needed to see how it compares with the > > > various implementations :-) Here's a simple test-program i guess :-D ``` #include <curses.h> #include <panel.h> int main( void) { int ch =3D -1; int y =3D 0, x =3D 0; WINDOW *pad1; PANEL *panel1; initscr (); noecho (); start_color(); init_pair(1, COLOR_BLUE, COLOR_RED); keypad(stdscr, TRUE); refresh(); pad1 =3D newpad(10,10); wbkgd (pad1, COLOR_PAIR(1)); waddstr (pad1,"Test."); prefresh(pad1, 0, 0, 1, 2, 4 , 9); panel1 =3D new_panel(pad1); while(ch !=3D 'q' && ch !=3D 'Q') { ch =3D getch(); if (ch =3D=3D KEY_UP ) ++y; else if (ch =3D=3D KEY_DOWN ) --y; else if (ch =3D=3D KEY_RIGHT) ++x; else if (ch =3D=3D KEY_LEFT ) --x; move_panel(panel1, y, x); update_panels(); } endwin( ); return(0); } ``` > > > > It occurs to me to wonder : is the panel library warranteed to work if > > you feed it a pad (or subpad or sub-window) instead of a plain old window? > > I've never tried it. Had the same thoughts, never tried it too. > > > > Is there a use case for calling new_panel( ) with a pad? Pads are really useful with anything involving scrollable text (such as logs, lists, fancy-tuifimanager stuff etc.). As you already know, the main appeal of panels is the fact that they solve the flickering issue of stacked windows in a more elegant way than manually doing so. Therefore pads with panels are practically useful for anything that already previously involved plain old stacked-windows but with too-much text. A few practical examples I can think of using pads with panels are thinks like: - https://www.reddit.com/r/neovim/comments/1u49mnw/ - https://www.reddit.com/r/commandline/comments/1tbfeua/ - https://github.com/reekta92/graf - plus, fancy modern-TUI animations? > > maybe - but pads differ from windows by being more readily movable > > > > > -- Bill > > > > > > -- Bill > > > > > > > > On 6/15/26 14:20, Giorgos Xou wrote: > > > > > move_panel internally uses mvwin, which doesn't work with pads (pdcurses > > > > > seems to be affected by this as well). Maybe pnoutrefresh could be used > > > > > internally for that specific case or some kind of an alternative new > > > > > mvpad function? > > > > > > > > > > (It just happened that I was again looking deep into how panels work > > > > > internally and just happened to stumble upon this issue.) > > > > > > > > > > *Cross-refs: * > > > > > 3. ncurses 6.3 - patch 20211106 < https://github.com/mirror/ncurses/commit/f399f54c6c4ea2143afcbf704ce9af0be5= 2b63fc > > > > > > 2. hide_panel/show_panel not working with pads. > > > > > < https://lists.gnu.org/archive/html/bug-ncurses/2021-10/msg00037.html> > > > > > 1. https://github.com/wmcbrine/PDCurses/issues/124 > > > > > <https://github.com/wmcbrine/PDCurses/issues/124> > > > > > > > > > > > > > > > -- > Thomas E. Dickey <[email protected]> > https://invisible-island.net PS. For some reason html "reply via email to" didn't work and I had to figure out how (this cool thing that is called) neomutt works. so I've no idea how this mail will be sent or if it actually was sent correctly. --0000000000009db7d5065455e689 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><br><br><div class=3D"gmail_quote gmail_quote_container"><= div dir=3D"ltr" class=3D"gmail_attr">---------- Forwarded message ---------= <br>From: <strong class=3D"gmail_sendername" dir=3D"auto">Giorgos Xou</stro= ng> <span dir=3D"auto"><<a href=3D"mailto:[email protected]">gxousos@gma= il.com</a>></span><br>Date: Tue, Jun 16, 2026 at 4:35=E2=80=AFAM<br>Subj= ect: Re: move_panel not working with pads<br>To: Thomas Dickey <<a href= =3D"mailto:[email protected]">[email protected]</a>>= <br></div><br><br>On Mon, Jun 15, 2026 at 07:11:11PM -0400, Thomas Dickey w= rote:<br> > On Mon, Jun 15, 2026 at 06:12:27PM -0400, Bill Gray wrote:<br> > > On 6/15/26 16:56, Thomas Dickey wrote:<br> > > > On Mon, Jun 15, 2026 at 02:57:45PM -0400, Bill Gray wrote:<b= r> > > > >=C2=A0 =C2=A0 =C2=A0Hmmm... please post the test code yo= u're using for this?=C2=A0 Have you tried<br> > > > > it with PDCursesMod?=C2=A0 (Its panel library is a near= -total rewrite, but its<br> > > > > move_panel() does use mvwin() internally.)<br> <br> No, I haven't tested it against PDCursesMod nor PDCurses, it was just a= speculation<br> considering it uses mvwin internally too.<br> <br> <br> > > > <br> > > > yes... a test-program is needed to see how it compares with = the<br> > > > various implementations :-)<br> <br> Here's a simple test-program i guess :-D<br> <br> ```<br> =C2=A0 =C2=A0 #include <curses.h><br> =C2=A0 =C2=A0 #include <panel.h><br> <br> <br> =C2=A0 =C2=A0 int main( void)<br> =C2=A0 =C2=A0 {<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 int ch =3D -1;<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 int y =3D 0, x =3D 0;<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 WINDOW *pad1;<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 PANEL=C2=A0 *panel1;<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 initscr=C2=A0 =C2=A0 ();<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 noecho=C2=A0 =C2=A0 =C2=A0();<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 start_color();<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 init_pair(1, COLOR_BLUE, COLOR_RED);<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 keypad(stdscr, TRUE);<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 refresh();<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 pad1 =3D newpad(10,10);<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 wbkgd=C2=A0 =C2=A0(pad1, COLOR_PAIR(1));<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 waddstr (pad1,"Test.");<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 prefresh(pad1, 0, 0, 1, 2, 4 , 9);<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 panel1 =3D new_panel(pad1);<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 while(ch !=3D 'q' && ch !=3D &#= 39;Q')<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 {<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ch =3D getch();<br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if=C2=A0 =C2=A0 =C2=A0 (ch =3D=3D= KEY_UP=C2=A0 =C2=A0) ++y;<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 else if (ch =3D=3D KEY_DOWN ) --y= ; <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 else if (ch =3D=3D KEY_RIGHT) ++x= ; <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 else if (ch =3D=3D KEY_LEFT ) --x= ; <br> <br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 move_panel(panel1, y, x);<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 update_panels();<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 }<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 endwin( );<br> =C2=A0 =C2=A0 =C2=A0 =C2=A0 return(0);<br> =C2=A0 =C2=A0 }<br> ```<br> <br> > > <br> > >=C2=A0 =C2=A0 It occurs to me to wonder : is the panel library war= ranteed to work if<br> > > you feed it a pad (or subpad or sub-window) instead of a plain ol= d window?<br> > > I've never tried it.<br> <br> Had the same thoughts, never tried it too.<br> <br> > > <br> > >=C2=A0 =C2=A0 Is there a use case for calling new_panel( ) with a = pad?<br> <br> Pads are really useful with anything involving scrollable text (such as<br> logs, lists, fancy-tuifimanager stuff etc.). <br> <br> As you already know, the main appeal of panels is the fact that they <br> solve the flickering issue of stacked windows in a more elegant way <br> than manually doing so. <br> <br> Therefore pads with panels are practically useful for anything that<br> already previously involved plain old stacked-windows but with <br> too-much text.<br> <br> A few practical examples I can think of using pads with panels are<br> thinks like:<br> - <a href=3D"https://www.reddit.com/r/neovim/comments/1u49mnw/" rel=3D"nore= ferrer" target=3D"_blank">https://www.reddit.com/r/neovim/comments/1u49mnw/= </a><br> - <a href=3D"https://www.reddit.com/r/commandline/comments/1tbfeua/" rel=3D= "noreferrer" target=3D"_blank">https://www.reddit.com/r/commandline/comment= s/1tbfeua/</a><br> - <a href=3D"https://github.com/reekta92/graf" rel=3D"noreferrer" target=3D= "_blank">https://github.com/reekta92/graf</a><br> - plus, fancy modern-TUI animations?<br> <br> <br> > <br> > maybe - but pads differ from windows by being more readily movable<br> > <br> > > <br> > > -- Bill<br> > > <br> > > > > -- Bill<br> > > > > <br> > > > > On 6/15/26 14:20, Giorgos Xou wrote:<br> > > > > > move_panel internally uses mvwin, which doesn'= t work with pads (pdcurses<br> > > > > > seems to be affected by this as well). Maybe pnout= refresh=C2=A0could be used<br> > > > > > internally for that specific case or some kind of = an alternative new<br> > > > > > mvpad function?<br> > > > > > <br> > > > > > (It just happened that I was again looking deep=C2= =A0into how panels work<br> > > > > > internally and just happened to stumble upon=C2=A0= this issue.)<br> > > > > > <br> > > > > > *Cross-refs: *<br> > > > > > 3. ncurses 6.3 - patch 20211106 <<a href=3D"htt= ps://github.com/mirror/ncurses/commit/f399f54c6c4ea2143afcbf704ce9af0be52b6= 3fc" rel=3D"noreferrer" target=3D"_blank">https://github.com/mirror/ncurses= /commit/f399f54c6c4ea2143afcbf704ce9af0be52b63fc</a>><br> > > > > > 2. hide_panel/show_panel not working with pads.<br= > > > > > > <<a href=3D"https://lists.gnu.org/archive/html/= bug-ncurses/2021-10/msg00037.html" rel=3D"noreferrer" target=3D"_blank">htt= ps://lists.gnu.org/archive/html/bug-ncurses/2021-10/msg00037.html</a>><b= r> > > > > > 1. <a href=3D"https://github.com/wmcbrine/PDCurses= /issues/124" rel=3D"noreferrer" target=3D"_blank">https://github.com/wmcbri= ne/PDCurses/issues/124</a><br> > > > > > <<a href=3D"https://github.com/wmcbrine/PDCurse= s/issues/124" rel=3D"noreferrer" target=3D"_blank">https://github.com/wmcbr= ine/PDCurses/issues/124</a>><br> > > > > <br> > > > > <br> > > > <br> > > <br> > <br> > -- <br> > Thomas E. Dickey <<a href=3D"mailto:[email protected]" ta= rget=3D"_blank">[email protected]</a>><br> > <a href=3D"https://invisible-island.net" rel=3D"noreferrer" target=3D"= _blank">https://invisible-island.net</a><br> <br> <br> PS. For some reason html "reply via email to" didn't work and= I had to <br> figure out how (this cool thing that is called) neomutt works. so I've<= br> no idea how this mail will be sent or if it actually was sent <br> correctly.<br> </div></div> --0000000000009db7d5065455e689--