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Welcome to the Fast Light Tool Kit general discussion group.
This is for general discussions about the FLTK library; questions, problems compiling/installing, etc.
This group is mirrored at fltk.org for read access via NNTP and web browsing.

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Lucas Sanner, Manolo2

7:04 AM

Make a window locked and not resizable ?

this approach seems to make it: #include <FL/Fl.H> #include <FL/Fl_Window.H> #include

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Make a window locked and not resizable ?

this approach seems to make it: #include <FL/Fl.H> #include <FL/Fl_Window.H> #include

7:04 AM

Klaus, … Manolo4

May 3

moveable modal dialog

You have to use the "Tweaks" application, select "Windows" in its left panel, go

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moveable modal dialog

You have to use the "Tweaks" application, select "Windows" in its left panel, go

May 3

Jackk Sonn, … Matthias Melcher6

May 2

Best practice for passing widget data between callbacks in FLTK?Body

Thanks guys I really do appreciate

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Best practice for passing widget data between callbacks in FLTK?Body

Thanks guys I really do appreciate

May 2

holm.h...@gmail.com, … Greg Ercolano6

Apr 29

On 4/29/26 01:20, holm.h...@gmail.com wrote: Hi, This works, but ideally, I would like the "x

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On 4/29/26 01:20, holm.h...@gmail.com wrote: Hi, This works, but ideally, I would like the "x

Apr 29

Christopher Reitz, … Manolo11

Apr 27

App crashes on startup with LIBDECOR_FORCE_CSD

Le lundi 27 avril 2026 à 14:39:22 UTC+2, Ian MacArthur a écrit : Still wonder what our cmake

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App crashes on startup with LIBDECOR_FORCE_CSD

Le lundi 27 avril 2026 à 14:39:22 UTC+2, Ian MacArthur a écrit : Still wonder what our cmake

Apr 27

Albrecht Schlosser, Michele Alessandrini2

Apr 25

FLTK 1.4.5 released on April 25, 2026

That's great news! After using all the existing C++ gui toolkits, I'm really starting to love

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FLTK 1.4.5 released on April 25, 2026

That's great news! After using all the existing C++ gui toolkits, I'm really starting to love

Apr 25

Michele Alessandrini, … Albrecht Schlosser5

Apr 23

Different background color on Windows and Linux

Thanks to everyone! Il giorno mercoledì 22 aprile 2026 alle 14:33:30 UTC+2 Albrecht-S ha scritto: On

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Different background color on Windows and Linux

Thanks to everyone! Il giorno mercoledì 22 aprile 2026 alle 14:33:30 UTC+2 Albrecht-S ha scritto: On

Apr 23

LM, … Albrecht Schlosser5

Apr 19

old FLTK programs

On Saturday, April 18, 2026 at 1:22:29 PM UTC-4 Albrecht-S wrote: The build system I'm using

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old FLTK programs

On Saturday, April 18, 2026 at 1:22:29 PM UTC-4 Albrecht-S wrote: The build system I'm using

Apr 19

pvr...@btinternet.com, Albrecht Schlosser4

Feb 27

Bug: Exception when clicking on an empty Fl_Tabs with OVERFLOW_PULLDOWN

FTR: On 2/26/26 22:25 'pvr...@btinternet.com' via fltk.general wrote: Issue #1366 raised.

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Bug: Exception when clicking on an empty Fl_Tabs with OVERFLOW_PULLDOWN

FTR: On 2/26/26 22:25 'pvr...@btinternet.com' via fltk.general wrote: Issue #1366 raised.

Feb 27

Robert Arkiletian, … Albrecht Schlosser5

Feb 26

Possible Fl_Pack resize regression from 1.3 to 1.4

On Wednesday, February 25, 2026 at 6:03:50 AM UTC-8 Albrecht-S wrote: ... Formally setting any widget

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Possible Fl_Pack resize regression from 1.3 to 1.4

On Wednesday, February 25, 2026 at 6:03:50 AM UTC-8 Albrecht-S wrote: ... Formally setting any widget

Feb 26

Evan Laforge, Manolo3

Feb 25

initial focus on OS X

1 yes this works and is the workaround I discovered. Since I use a non blocking queue I had to add

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initial focus on OS X

1 yes this works and is the workaround I discovered. Since I use a non blocking queue I had to add

Feb 25

holm.h...@gmail.com, … pvr...@btinternet.com8

Feb 23

Hi Håvard I handle a "dark" mode feature using the following code: // Set foreground and

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Hi Håvard I handle a "dark" mode feature using the following code: // Set foreground and

Feb 23

Brian Emberling, … Ian MacArthur24

Feb 13

FLTK 1.3 vs 1.4 on windows11 without X11

On Friday, 13 February 2026 at 09:42:04 UTC ed wrote: Hello All Thanks for the info. My question

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FLTK 1.3 vs 1.4 on windows11 without X11

On Friday, 13 February 2026 at 09:42:04 UTC ed wrote: Hello All Thanks for the info. My question

Feb 13

duncan gibson, Greg Ercolano6

Jan 30

NNTP access to FLTK forums

On 1/30/26 08:28, duncan gibson wrote: > Well after quite a bit of faffing about, trying to get

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NNTP access to FLTK forums

On 1/30/26 08:28, duncan gibson wrote: > Well after quite a bit of faffing about, trying to get

Jan 30

Rob McDonald, … imm7

Jan 30

Font selection problem

> > Well, FL_COURIER seems to be working for this user. We'll see how it goes. >

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Font selection problem

> > Well, FL_COURIER seems to be working for this user. We'll see how it goes. >

Jan 30

danielc...@gmail.com, … Daniel G.4

Jan 19

FLTK wasm build

How cool, I would also like to see an official WASM build (: > Is there currently a standard or

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FLTK wasm build

How cool, I would also like to see an official WASM build (: > Is there currently a standard or

Jan 19

Andre Steenveld, … Albrecht Schlosser10

Jan 15

Debian trixie upgrade FLTK or not?

On 1/15/26 14:37 Andre Steenveld wrote: > The details you give are clear enough for me. > I do

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Debian trixie upgrade FLTK or not?

On 1/15/26 14:37 Andre Steenveld wrote: > The details you give are clear enough for me. > I do

Jan 15

Andre Steenveld, … Albrecht Schlosser26

Jan 11

bug in Fl_Cairo.h?

Op zondag 11 januari 2026 om 17:47:07 UTC+1 schreef Albrecht-S: ... If you really want to "

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bug in Fl_Cairo.h?

Op zondag 11 januari 2026 om 17:47:07 UTC+1 schreef Albrecht-S: ... If you really want to "

Jan 11

Miguel J, … Matthias Melcher21

Jan 8

Invisible selection color

Oh, you meant in the user interface of Fluid itself, not the custom UI that Fluid generates. Yeah,

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Invisible selection color

Oh, you meant in the user interface of Fluid itself, not the custom UI that Fluid generates. Yeah,

Jan 8

Paul Hahn, … Matthias Melcher10

Jan 7

Coin3d using FLTK for display

Vey cool. Thank you! fmorcia...@gmail.com schrieb am Dienstag, 6. Januar 2026 um 18:43:19 UTC+1:

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Coin3d using FLTK for display

Vey cool. Thank you! fmorcia...@gmail.com schrieb am Dienstag, 6. Januar 2026 um 18:43:19 UTC+1:

Jan 7

Dejan Lekic, Matthias Melcher3

Jan 4

FLTK bindings for the D programming language

Glad you are still around, my friend! Yes, C++ is catching up with D last 20 years, and modern C++ is

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FLTK bindings for the D programming language

Glad you are still around, my friend! Yes, C++ is catching up with D last 20 years, and modern C++ is

Jan 4

Albrecht Schlosser

12/31/25

... to all FLTK users, developers, and everybody else! (Here in Germany it's now Jan. 01, 2026,

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... to all FLTK users, developers, and everybody else! (Here in Germany it's now Jan. 01, 2026,

12/31/25

david allen, … Matthias Melcher4

12/30/25

Windows porting

I think it was the line *** CAUTION: This file is outdated. This needs a major rework! *** and the

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Windows porting

I think it was the line *** CAUTION: This file is outdated. This needs a major rework! *** and the

12/30/25

duncan gibson, Manolo6

12/28/25

Fl_Gl_Window glViewport(0,0,pixel_w(),pixel_h()) and child widget size?

Le mardi 23 décembre 2025 à 17:33:33 UTC+1, englishman.in....@gmail.com a écrit : ... Having skimmed

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Fl_Gl_Window glViewport(0,0,pixel_w(),pixel_h()) and child widget size?

Le mardi 23 décembre 2025 à 17:33:33 UTC+1, englishman.in....@gmail.com a écrit : ... Having skimmed

12/28/25

danielc...@gmail.com, Matthias Melcher8

12/19/25

Fl_Gl_Window FL_DEPTH

Ok, reading up on X11/GLX it seems that indeed many drivers do not support 32 bit depth buffers, even

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Fl_Gl_Window FL_DEPTH

Ok, reading up on X11/GLX it seems that indeed many drivers do not support 32 bit depth buffers, even

12/19/25

wea...@gmail.com, … Albrecht Schlosser20

12/14/25

1.4.4 build fails on OpenBSD

On 12/13/25 21:46 wea...@gmail.com wrote: Hint: if you want to try it yourself (maybe to provide a

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1.4.4 build fails on OpenBSD

On 12/13/25 21:46 wea...@gmail.com wrote: Hint: if you want to try it yourself (maybe to provide a

12/14/25

danielc...@gmail.com2

12/10/25

how keep menu visible when checking/unchecking checkboxes

Found the solution: void menu_cb(Fl_Widget* w, void* data) { Fl_Menu_Bar* menu = (Fl_Menu_Bar*)w;

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how keep menu visible when checking/unchecking checkboxes

Found the solution: void menu_cb(Fl_Widget* w, void* data) { Fl_Menu_Bar* menu = (Fl_Menu_Bar*)w;

12/10/25

Lucas Sanner, … Ian MacArthur3

12/3/25

Redrawing a label area in real-time ?

On Wednesday, 3 December 2025 at 15:12:31 UTC lucas.... wrote: Hi all, I've created my own widget

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Redrawing a label area in real-time ?

On Wednesday, 3 December 2025 at 15:12:31 UTC lucas.... wrote: Hi all, I've created my own widget

12/3/25

pvr...@btinternet.com, … Ian MacArthur5

12/2/25

Switching between build options (libpng).

From: fltkg...@googlegroups.com <fltkg...@googlegroups.com> on behalf of Ian MacArthur

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Switching between build options (libpng).

From: fltkg...@googlegroups.com <fltkg...@googlegroups.com> on behalf of Ian MacArthur

12/2/25

Matthias Melcher

12/2/25

Poll for the Plastic Scheme

Please note the poll: https://github.com/fltk/fltk/discussions/1343 Thanks ;-)

unread,

Poll for the Plastic Scheme

Please note the poll: https://github.com/fltk/fltk/discussions/1343 Thanks ;-)

12/2/25

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