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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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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

Albrecht Schlosser

7/20/25

FLTK 1.4.4 released on July 20, 2025

We are pleased to announce the release of FLTK 1.4.4. This is a maintenance release with bug fixes

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FLTK 1.4.4 released on July 20, 2025

We are pleased to announce the release of FLTK 1.4.4. This is a maintenance release with bug fixes

7/20/25

Albrecht Schlosser

7/15/25

RFC: Preparation of release 1.4.4

Dear FLTK devs, please take a look at GitHub Issue #1281 and add your comments https://github.com/

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RFC: Preparation of release 1.4.4

Dear FLTK devs, please take a look at GitHub Issue #1281 and add your comments https://github.com/

7/15/25

Gonzalo Garramuño, … Albrecht Schlosser11

7/6/25

Recent commit in Fl_Help_View.H by Matt introduces problems with some compilers

El 6/7/25 a las 12:02, 'Albrecht Schlosser' via fltk.coredev escribió: > What is the

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Recent commit in Fl_Help_View.H by Matt introduces problems with some compilers

El 6/7/25 a las 12:02, 'Albrecht Schlosser' via fltk.coredev escribió: > What is the

7/6/25

Gonzalo Garramuño

6/24/25

Two technical Vulkan questions for those in the know

1) Can VMA be run on macOS? 2) Is MoltenVK still restricted to MoltenVK 1.2? -- ggar...@gmail.com

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Two technical Vulkan questions for those in the know

1) Can VMA be run on macOS? 2) Is MoltenVK still restricted to MoltenVK 1.2? -- ggar...@gmail.com

6/24/25

Greg Ercolano, … Albrecht Schlosser3

6/23/25

Fl::awake() docs example

On 6/22/25 19:10 imm wrote: On Sun, 22 Jun 2025, 17:44 Greg wrote: It made sense to put this below

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Fl::awake() docs example

On 6/22/25 19:10 imm wrote: On Sun, 22 Jun 2025, 17:44 Greg wrote: It made sense to put this below

6/23/25

6/22/25

'make html' warnings in master branch

Just cloned the repo, getting these warnings from 'make html' on the master branch:

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'make html' warnings in master branch

Just cloned the repo, getting these warnings from 'make html' on the master branch:

6/22/25

Manolo, Albrecht Schlosser3

6/13/25

About FLTK and macOS 26 "Tahoe"

The problem in titlebar capture under macOS Tahoe has been fixed (3d13dfe).

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About FLTK and macOS 26 "Tahoe"

The problem in titlebar capture under macOS Tahoe has been fixed (3d13dfe).

6/13/25

melcher....@googlemail.com, … Albrecht Schlosser35

5/21/25

Please vote for Core Add-Ons

On 5/21/25 11:33 Manolo wrote: Le mercredi 21 mai 2025 à 09:58:19 UTC+2, Manolo a écrit : Matthias:

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Please vote for Core Add-Ons

On 5/21/25 11:33 Manolo wrote: Le mercredi 21 mai 2025 à 09:58:19 UTC+2, Manolo a écrit : Matthias:

5/21/25

Manolo, … Albrecht Schlosser12

5/8/25

Please vote about addition of class Fl_Native_Input to FLTK 1.5

Le mercredi 7 mai 2025 à 09:42:13 UTC+2, Manolo a écrit : Le mardi 6 mai 2025 à 11:57:07 UTC+2,

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Please vote about addition of class Fl_Native_Input to FLTK 1.5

Le mercredi 7 mai 2025 à 09:42:13 UTC+2, Manolo a écrit : Le mardi 6 mai 2025 à 11:57:07 UTC+2,

5/8/25

Albrecht Schlosser

4/29/25

FLTK 1.4.3 released on April 29, 2025

We are pleased to announce the release of FLTK 1.4.3 This is a maintenance release with bug fixes and

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FLTK 1.4.3 released on April 29, 2025

We are pleased to announce the release of FLTK 1.4.3 This is a maintenance release with bug fixes and

4/29/25

melcher....@googlemail.com, … Albrecht Schlosser13

4/3/25

FLTK 1.5 and SDL3

On 4/3/25 13:55 schrieb 'melcher....@googlemail.com' via fltk.coredev wrote: Albrecht-S

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FLTK 1.5 and SDL3

On 4/3/25 13:55 schrieb 'melcher....@googlemail.com' via fltk.coredev wrote: Albrecht-S

4/3/25

imacarthur, Albrecht Schlosser3

3/18/25

Windows Defender false positives from fltk-1.4 with mingw32/gcc-9.2 on WIn11

On Monday, 17 March 2025 at 18:15:04 UTC Albrecht-S wrote: On 3/17/25 10:40 imacarthur wrote: So I

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Windows Defender false positives from fltk-1.4 with mingw32/gcc-9.2 on WIn11

On Monday, 17 March 2025 at 18:15:04 UTC Albrecht-S wrote: On 3/17/25 10:40 imacarthur wrote: So I

3/18/25

imacarthur, Albrecht Schlosser14

3/15/25

1.5.0 build failure with 32-bit mingw

On 3/14/25 12:07 imacarthur wrote: On Thursday, 13 March 2025 at 18:11:46 UTC Albrecht-S wrote: No

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1.5.0 build failure with 32-bit mingw

On 3/14/25 12:07 imacarthur wrote: On Thursday, 13 March 2025 at 18:11:46 UTC Albrecht-S wrote: No

3/15/25

melcher....@googlemail.com

3/7/25

Sorry for so many changes spread over the day. That was not the smartest approach. I hope I did not

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Sorry for so many changes spread over the day. That was not the smartest approach. I hope I did not

3/7/25

Albrecht Schlosser, … Greg Ercolano5

3/7/25

Git `master` is now FLTK 1.5

On 3/7/25 18:23 Greg Ercolano wrote: I removed most mentions of Fl_String and replaced everything

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Git `master` is now FLTK 1.5

On 3/7/25 18:23 Greg Ercolano wrote: I removed most mentions of Fl_String and replaced everything

3/7/25

Albrecht Schlosser, … Manolo62

3/4/25

[RFC] FLTK 1.4 maintenance mode and 1.5 development

Here is what I get using Xcode 16's compiler on macOS 15: /Library/Developer/CommandLineTools/usr

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[RFC] FLTK 1.4 maintenance mode and 1.5 development

Here is what I get using Xcode 16's compiler on macOS 15: /Library/Developer/CommandLineTools/usr

3/4/25

Albrecht Schlosser

2/23/25

FLTK 1.4.2 released on Feb. 23, 2025

We are pleased to announce the release of FLTK 1.4.2 This is a maintenance release with bug fixes and

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FLTK 1.4.2 released on Feb. 23, 2025

We are pleased to announce the release of FLTK 1.4.2 This is a maintenance release with bug fixes and

2/23/25

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