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Welcome to the Fast Light Tool Kit core developer's discussion group.
This group is where developers discuss development of the FLTK core library.
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Manolo, Albrecht Schlosser2

Aug 1

No compatibility issue detected between FLTK GH and macOS 27 public beta

On 8/1/26 08:48 Manolo wrote: > I detected no compatibility issue between FLTK GH and the public

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No compatibility issue detected between FLTK GH and macOS 27 public beta

On 8/1/26 08:48 Manolo wrote: > I detected no compatibility issue between FLTK GH and the public

Aug 1

Manolo, Albrecht Schlosser3

Jul 28

Proposal to change in FLTK 1.5 the default value of Fl::use_high_res_GL() from 0 to 1

The proposed change has been committed at f0c8f5a without deprecating the Fl::use_high_res_GL()

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Proposal to change in FLTK 1.5 the default value of Fl::use_high_res_GL() from 0 to 1

The proposed change has been committed at f0c8f5a without deprecating the Fl::use_high_res_GL()

Jul 28

Greg Ercolano, … Albrecht Schlosser16

Jul 21

RFC/vote: A fl_utf8 function for detecting continuation bytes

So naming things really is the hardest thing.. I always thought so, lol. It's looking like

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RFC/vote: A fl_utf8 function for detecting continuation bytes

So naming things really is the hardest thing.. I always thought so, lol. It's looking like

Jul 21

Greg Ercolano, … Bill Spitzak4

Jul 17

Recent pull requests

Don't make the method static unless it is actually useful without an instance of the object. If

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Recent pull requests

Don't make the method static unless it is actually useful without an instance of the object. If

Jul 17

imacarthur, … Albrecht Schlosser19

Jun 26

1.5 - Pen support on Windows build query

Thanks Ian. I knew of TDM-GCC, but I never tried it. There was even a post in fltk.general in 2017,

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1.5 - Pen support on Windows build query

Thanks Ian. I knew of TDM-GCC, but I never tried it. There was even a post in fltk.general in 2017,

Jun 26

Gonzalo Garramuño, … Manolo8

Jun 23

Any ideas on how to get the surface for the titlebar?

Le mardi 23 juin 2026 à 17:48:16 UTC+2, melcher....@googlemail.com a écrit : Windows and macOS send

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Any ideas on how to get the surface for the titlebar?

Le mardi 23 juin 2026 à 17:48:16 UTC+2, melcher....@googlemail.com a écrit : Windows and macOS send

Jun 23

melcher....@googlemail.com, … Albrecht Schlosser4

Jun 11

Proposal: FLTK Policy on AI-Assisted Code Contributions

On 5/29/26 13:01 Matthias Melcher wrote: My Position The copyright concern is real — but it is not

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Proposal: FLTK Policy on AI-Assisted Code Contributions

On 5/29/26 13:01 Matthias Melcher wrote: My Position The copyright concern is real — but it is not

Jun 11

Gonzalo Garramuño, … melcher....@googlemail.com7

May 28

About Pen Support on Wayland

OK, I looked at the code and it is really good. Some features are above C++11, but nothing that can

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About Pen Support on Wayland

OK, I looked at the code and it is really good. Some features are above C++11, but nothing that can

May 28

melcher....@googlemail.com, … LM15

May 11

FLTK 1.5 and SDL3

SDL2 was removed from FLTK because it was only half way implemented and I was not able to maintain it

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FLTK 1.5 and SDL3

SDL2 was removed from FLTK because it was only half way implemented and I was not able to maintain it

May 11

Albrecht Schlosser

Apr 25

FLTK 1.4.5 released on April 25, 2026

We are pleased to announce the release of FLTK 1.4.5. This is a maintenance release with many bug

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FLTK 1.4.5 released on April 25, 2026

We are pleased to announce the release of FLTK 1.4.5. This is a maintenance release with many bug

Apr 25

Albrecht Schlosser, … melcher....@googlemail.com13

Apr 23

Preparation of release 1.4.5

On 4/23/26 12:58 schrieb 'Albrecht Schlosser' wrote: On 4/23/26 10:20 Manolo wrote: ... I

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Preparation of release 1.4.5

On 4/23/26 12:58 schrieb 'Albrecht Schlosser' wrote: On 4/23/26 10:20 Manolo wrote: ... I

Apr 23

Apr 12

AI and open source

I've seen some of the bug reports and AI assisted patches. Apparently linux has had their share

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AI and open source

I've seen some of the bug reports and AI assisted patches. Apparently linux has had their share

Apr 12

Manolo, … Albrecht Schlosser11

Mar 14

About the Fl::lock() call to initialize threading support

On 3/13/26 18:03 Manolo wrote: Le vendredi 13 mars 2026 à 11:09:19 UTC+1, melcher....@googlemail.com

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About the Fl::lock() call to initialize threading support

On 3/13/26 18:03 Manolo wrote: Le vendredi 13 mars 2026 à 11:09:19 UTC+1, melcher....@googlemail.com

Mar 14

Manolo, … Albrecht Schlosser30

Feb 8

About window classes FLTK uses in its Windows platform and emoji input

Sorry for the delay... On 1/18/26 21:57 'Albrecht Schlosser' via fltk.coredev wrote: On 1/15/

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About window classes FLTK uses in its Windows platform and emoji input

Sorry for the delay... On 1/18/26 21:57 'Albrecht Schlosser' via fltk.coredev wrote: On 1/15/

Feb 8

Feb 8

Patch for user_data

Hi When refactoring the callback implementation for pyFltk, the Python bindings for fltk, I noticed

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Patch for user_data

Hi When refactoring the callback implementation for pyFltk, the Python bindings for fltk, I noticed

Feb 8

Manolo, … Albrecht Schlosser12

Feb 6

Proposal to set macOS 10.9 Mavericks as earliest supported macOS version for FLTK 1.5

On 2/2/26 13:22 Manolo wrote: > I've found that I can build and also run FLTK 1.5 for macOS

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Proposal to set macOS 10.9 Mavericks as earliest supported macOS version for FLTK 1.5

On 2/2/26 13:22 Manolo wrote: > I've found that I can build and also run FLTK 1.5 for macOS

Feb 6

Manolo, … Albrecht Schlosser29

Jan 28

About recent commits to have FLTK handle properly all emojis

On 1/27/26 16:47 Manolo wrote: Le lundi 26 janvier 2026 à 16:17:24 UTC+1, Albrecht-S a écrit : … >

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About recent commits to have FLTK handle properly all emojis

On 1/27/26 16:47 Manolo wrote: Le lundi 26 janvier 2026 à 16:17:24 UTC+1, Albrecht-S a écrit : … >

Jan 28

imacarthur, … Albrecht Schlosser16

Jan 9

(fltk-1.5) Issues with the new PEN support code under Win32 with mingwXX compilers

On 1/9/26 14:36 imacarthur wrote: On Friday, 9 January 2026 at 13:18:54 UTC Albrecht-S wrote: Hmm,

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(fltk-1.5) Issues with the new PEN support code under Win32 with mingwXX compilers

On 1/9/26 14:36 imacarthur wrote: On Friday, 9 January 2026 at 13:18:54 UTC Albrecht-S wrote: Hmm,

Jan 9

Andreas Held, melcher....@googlemail.com4

Jan 6

Patch for Fl_Valuator

Fl_Valuator::format() is a virtual function that can be overridden by the user, and I have to assume

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Patch for Fl_Valuator

Fl_Valuator::format() is a virtual function that can be overridden by the user, and I have to assume

Jan 6

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

Gonzalo Garramuño, … Albrecht Schlosser6

12/24/25

Tests do not compile on Ubuntu due to a missing semicolon in the lambdas.

The mystery is indeed resolved. In my script, I was *NOT* building fluid and thus, it was grabbing

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Tests do not compile on Ubuntu due to a missing semicolon in the lambdas.

The mystery is indeed resolved. In my script, I was *NOT* building fluid and thus, it was grabbing

12/24/25

Manolo, Gonzalo Garramuño3

12/23/25

Version 2 of a proposal for a new FLTK widget : Fl_Dockable_Group

Le lundi 22 décembre 2025 à 00:51:25 UTC+1, ggar...@gmail.com a écrit : > This is an improvement

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Version 2 of a proposal for a new FLTK widget : Fl_Dockable_Group

Le lundi 22 décembre 2025 à 00:51:25 UTC+1, ggar...@gmail.com a écrit : > This is an improvement

12/23/25

Gonzalo Garramuño, melcher....@googlemail.com3

11/29/25

Fl/names.h broken in Git Head

Never mind. `static` seems to be the right way for C++11. It's only for debugging anyway.

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Fl/names.h broken in Git Head

Never mind. `static` seems to be the right way for C++11. It's only for debugging anyway.

11/29/25

melcher....@googlemail.com, Albrecht Schlosser4

11/1/25

RFC: convert Fl class to namespace

Allrighty then. Thanks, Albrecht, for the clarifying phone call. There is now a clean version of this

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RFC: convert Fl class to namespace

Allrighty then. Thanks, Albrecht, for the clarifying phone call. There is now a clean version of this

11/1/25

Manolo, … melcher....@googlemail.com5

10/24/25

What C++11 features are allowed in FLTK?

Nice idea! I'd suggest `#include <FL/Box>`, but since we don't go there anyway. I have

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What C++11 features are allowed in FLTK?

Nice idea! I'd suggest `#include <FL/Box>`, but since we don't go there anyway. I have

10/24/25

Greg Ercolano, Albrecht Schlosser3

10/10/25

'make html' error/warning

On 10/9/25 12:23, 'Albrecht Schlosser' via fltk.coredev wrote: On 10/9/25 20:19 Greg Ercolano

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'make html' error/warning

On 10/9/25 12:23, 'Albrecht Schlosser' via fltk.coredev wrote: On 10/9/25 20:19 Greg Ercolano

10/10/25

9/19/25

FLTK 1.4 will be in Ubuntu 25.10 "Questing Quokka" 25.10 when released

I've upgraded my Ubuntu 25.04 to 25.10 beta and noticed FLTK 1.4.3 is available there as a

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FLTK 1.4 will be in Ubuntu 25.10 "Questing Quokka" 25.10 when released

I've upgraded my Ubuntu 25.04 to 25.10 beta and noticed FLTK 1.4.3 is available there as a

9/19/25

df7...@gmail.com, … Albrecht Schlosser4

8/21/25

fluid syntax error cross build amd64 on i386

This is all good info, for now I had just removed the items from DIRS that I didn't need, that

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fluid syntax error cross build amd64 on i386

This is all good info, for now I had just removed the items from DIRS that I didn't need, that

8/21/25

Gonzalo Garramuño, Manolo3

8/3/25

pixels_per_unit question

On 8/2/2025 3:08 PM, Manolo wrote: > Function Fl_Screen_Driver::open_display() > calls

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pixels_per_unit question

On 8/2/2025 3:08 PM, Manolo wrote: > Function Fl_Screen_Driver::open_display() > calls

8/3/25

Gonzalo Garramuño, … Bill Spitzak5

7/20/25

Threading windows' drawing

On 7/17/2025 1:54 PM, 'Albrecht Schlosser' via fltk.coredev wrote: > Re: [fltk.coredev]

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Threading windows' drawing

On 7/17/2025 1:54 PM, 'Albrecht Schlosser' via fltk.coredev wrote: > Re: [fltk.coredev]

7/20/25

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