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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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duncan gibson, Manolo2

2:29 AM

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

I didn't look at the attached code yet but can already put here some probably relevant

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

I didn't look at the attached code yet but can already put here some probably relevant

2:29 AM

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

Dec 14

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

Dec 14

danielc...@gmail.com2

Dec 10

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;

Dec 10

Paul Hahn, … Matthias Melcher6

Dec 10

Coin3d using FLTK for display

Great, thank you for the pointers. I will try to do it myself then. Best regards to all who are so

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Coin3d using FLTK for display

Great, thank you for the pointers. I will try to do it myself then. Best regards to all who are so

Dec 10

Lucas Sanner, … Ian MacArthur3

Dec 3

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

Dec 3

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

Dec 2

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

Dec 2

Matthias Melcher

Dec 2

Poll for the Plastic Scheme

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

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Poll for the Plastic Scheme

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

Dec 2

Robert Arkiletian, imm4

Nov 30

fltk-config --cxxflags in different linux distros

On Saturday, November 29, 2025 at 3:28:27 PM UTC-8 Robert Arkiletian wrote: On Saturday, November 29,

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fltk-config --cxxflags in different linux distros

On Saturday, November 29, 2025 at 3:28:27 PM UTC-8 Robert Arkiletian wrote: On Saturday, November 29,

Nov 30

david allen, Albrecht Schlosser6

Nov 28

Error linking FLTK-Cairo program

On 11/27/25 20:42 david allen wrote: This solved the problem: target_link_libraries(trial-02 PUBLIC

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Error linking FLTK-Cairo program

On 11/27/25 20:42 david allen wrote: This solved the problem: target_link_libraries(trial-02 PUBLIC

Nov 28

Gonzalo Garramuño, Matthias Melcher2

Nov 28

Unicode question

`std::wstring_convert` was removed in C++20. FLTK offers a bunch of functions to convert utf8 to

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Unicode question

`std::wstring_convert` was removed in C++20. FLTK offers a bunch of functions to convert utf8 to

Nov 28

ed.vi...@gmail.com, … Matthias Melcher10

Nov 21

Change font size in fluid

1.4.0 will certainly work. Please check your versions. The only thing that was improved for app

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Change font size in fluid

1.4.0 will certainly work. Please check your versions. The only thing that was improved for app

Nov 21

Klaus Rudolph, … Manolo16

Nov 18

fltk 1.5 on linux configured with -D FLTK_GRAPHICS_CAIRO=ON leaves FLTK_HAVE_CAIRO unset

Le lundi 17 novembre 2025 à 20:00:34 UTC+1, Klaus Rudolph a écrit : Did fl_draw() not draw with cairo

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fltk 1.5 on linux configured with -D FLTK_GRAPHICS_CAIRO=ON leaves FLTK_HAVE_CAIRO unset

Le lundi 17 novembre 2025 à 20:00:34 UTC+1, Klaus Rudolph a écrit : Did fl_draw() not draw with cairo

Nov 18

holm.h...@gmail.com, … Matthias Melcher6

Nov 17

focus to subwindows

Ian MacArthur schrieb am Montag, 17. November 2025 um 12:03:38 UTC+1: On Monday, 17 November 2025 at

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focus to subwindows

Ian MacArthur schrieb am Montag, 17. November 2025 um 12:03:38 UTC+1: On Monday, 17 November 2025 at

Nov 17

Jeff Paranich, … Manolo3

Nov 14

FLTK_OPTION_PRINT_SUPPORT=OFF still requires linking winspool

Option FLTK_OPTION_PRINT_SUPPORT=OFF has an effect only under Linux/Unix where it removes the source

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FLTK_OPTION_PRINT_SUPPORT=OFF still requires linking winspool

Option FLTK_OPTION_PRINT_SUPPORT=OFF has an effect only under Linux/Unix where it removes the source

Nov 14

Gonzalo Garramuño, Greg Ercolano2

Nov 10

Clarification on macOS bundle and exec icon on taskbar

On 11/10/25 14:23, Gonzalo Garramuño wrote: Two questions: 1) According to some AI familiar with

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Clarification on macOS bundle and exec icon on taskbar

On 11/10/25 14:23, Gonzalo Garramuño wrote: Two questions: 1) According to some AI familiar with

Nov 10

Klaus Rudolph, … Manolo12

Nov 9

transparency for drawing in fltk 1.5 on linux with X11/wayland

It's very difficult to detail in few words the effect and the default values of build option

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transparency for drawing in fltk 1.5 on linux with X11/wayland

It's very difficult to detail in few words the effect and the default values of build option

Nov 9

Klaus Rudolph, … imm7

Nov 9

multi touch support

On Sun, 9 Nov 2025, 10:52 'Klaus Rudolph' wrote: Thanks for the replies! Maybe to get a

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multi touch support

On Sun, 9 Nov 2025, 10:52 'Klaus Rudolph' wrote: Thanks for the replies! Maybe to get a

Nov 9

david allen, Matthias Melcher2

Nov 9

Doc bug for fl_filename_ext

Fixed in d12d16f6abd2b414401007e0f975f369b5262097 . Please use https://github.com/fltk/fltk/issues .

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Doc bug for fl_filename_ext

Fixed in d12d16f6abd2b414401007e0f975f369b5262097 . Please use https://github.com/fltk/fltk/issues .

Nov 9

pvr...@btinternet.com, Albrecht Schlosser6

Nov 7

Using CMake to build under MSVC.

On 11/7/25 11:18 'pvr...@btinternet.com' via fltk.general wrote: If I try and build my app

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Using CMake to build under MSVC.

On 11/7/25 11:18 'pvr...@btinternet.com' via fltk.general wrote: If I try and build my app

Nov 7

Gonzalo Garramuño, Manolo3

Nov 6

FLTK Wayland application under KDE Plasma

On 11/6/2025 10:29 AM, Manolo wrote: > The mrv2 discussions says > "You found a really

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FLTK Wayland application under KDE Plasma

On 11/6/2025 10:29 AM, Manolo wrote: > The mrv2 discussions says > "You found a really

Nov 6

Klaus Rudolph, … Albrecht Schlosser8

Nov 1

setting font in fltk

On 11/1/25 15:31 'Klaus Rudolph' via fltk.general wrote: See above. If you build the library

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setting font in fltk

On 11/1/25 15:31 'Klaus Rudolph' via fltk.general wrote: See above. If you build the library

Nov 1

Roger Tunnicliffe, … Albrecht Schlosser8

Oct 31

Undefined Reference - on.. well, just about everything

Thx Albrecht I found what was required. These are the additional libraries I needed to link (for this

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Undefined Reference - on.. well, just about everything

Thx Albrecht I found what was required. These are the additional libraries I needed to link (for this

Oct 31

Roger Tunnicliffe, Albrecht Schlosser2

Oct 31

On 10/31/25 21:46 Roger Tunnicliffe wrote: > I seem to remember doing this a few years ago but

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On 10/31/25 21:46 Roger Tunnicliffe wrote: > I seem to remember doing this a few years ago but

Oct 31

Klaus Rudolph, Albrecht Schlosser4

Oct 26

seg fault with fl_draw fltk1.4.4

On 10/26/25 16:43 'Klaus Rudolph' wrote: Albrecht-S schrieb am Sonntag, 26. Oktober 2025 um

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seg fault with fl_draw fltk1.4.4

On 10/26/25 16:43 'Klaus Rudolph' wrote: Albrecht-S schrieb am Sonntag, 26. Oktober 2025 um

Oct 26

Klaus Rudolph, imm2

Oct 26

crash in fl_draw

With the caveat that I'm on my phone and haven't actually tested your example.... On Sun, 26

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crash in fl_draw

With the caveat that I'm on my phone and haven't actually tested your example.... On Sun, 26

Oct 26

Gonzalo Garramuño, Matthias Melcher3

Oct 25

Creating a tooltip programmatically at a certain screen position

Oh, and you can also get the FL_BEFORE_TOLTIP event for any widget. It gives you the opportunity to

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Creating a tooltip programmatically at a certain screen position

Oh, and you can also get the FL_BEFORE_TOLTIP event for any widget. It gives you the opportunity to

Oct 25

Paul Hahn, Matthias Melcher4

Oct 24

Fl_Plugin question

pauldou...@gmail.com schrieb am Donnerstag, 23. Oktober 2025 um 23:54:35 UTC+2: FYI I have just

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Fl_Plugin question

pauldou...@gmail.com schrieb am Donnerstag, 23. Oktober 2025 um 23:54:35 UTC+2: FYI I have just

Oct 24

Oct 23

ProgressBar Indeterminate Mode?

Does the FL_Progress have an option to make it indeterminate. My thinking on this is it would simple

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ProgressBar Indeterminate Mode?

Does the FL_Progress have an option to make it indeterminate. My thinking on this is it would simple

Oct 23

Sep 11

Fl_Slider events after deactivate()

Unsurprisingly, this was an issue on my end. Rob On Wednesday, September 10, 2025 at 4:12:51 PM UTC-7

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Fl_Slider events after deactivate()

Unsurprisingly, this was an issue on my end. Rob On Wednesday, September 10, 2025 at 4:12:51 PM UTC-7

Sep 11

Eric Sokolowsky

Sep 10

Sensitivity for touch screens

I'm writing an application with FLTK 1.4.4 that is primarily intended to be run on a touch screen

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Sensitivity for touch screens

I'm writing an application with FLTK 1.4.4 that is primarily intended to be run on a touch screen

Sep 10

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