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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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Dibo, Matthias Melcher2

Jul 25

Get widget type in drawing Fl::set_boxtype callback

Sorry, no. The box drawing functions have no way of knowing which widget called them. FLTK 1 she not

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Get widget type in drawing Fl::set_boxtype callback

Sorry, no. The box drawing functions have no way of knowing which widget called them. FLTK 1 she not

Jul 25

Dibo, … Matthias Melcher5

Jul 24

Fl_Browser - how to properly scale icon to the row size?

Before you call any graphics call, you need to either show a window or explicitly open the connection

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Fl_Browser - how to properly scale icon to the row size?

Before you call any graphics call, you need to either show a window or explicitly open the connection

Jul 24

Gonzalo Garramuño, Albrecht Schlosser2

Jul 24

Is Fl::check / Fl::wait / Fl::flush timeout safe?

On 7/22/26 22:18 Gonzalo Garramuño wrote: We all know that Fl::check and similar functions are not

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Is Fl::check / Fl::wait / Fl::flush timeout safe?

On 7/22/26 22:18 Gonzalo Garramuño wrote: We all know that Fl::check and similar functions are not

Jul 24

Dibo, … Greg Ercolano5

Jul 14

SVG image - wrong positioning in FL_Button

Indeed problem was with label beeing empty instead of nil :( . Thank you guys! poniedziałek, 13 lipca

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SVG image - wrong positioning in FL_Button

Indeed problem was with label beeing empty instead of nil :( . Thank you guys! poniedziałek, 13 lipca

Jul 14

Albrecht Schlosser, … Greg Ercolano11

Jul 9

RFC: Dark mode on fltk.org, and slightly modified colors

On 7/5/26 16:51 'Albrecht Schlosser' wrote: Known issue: Dillo doesn't support the "

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RFC: Dark mode on fltk.org, and slightly modified colors

On 7/5/26 16:51 'Albrecht Schlosser' wrote: Known issue: Dillo doesn't support the "

Jul 9

Robert Arkiletian, Albrecht Schlosser2

Jun 27

6 months free AI for Open Source projects

Thanks. Interesting ... On 6/27/26 19:58 Robert Arkiletian wrote: > Just wanted to let the core

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6 months free AI for Open Source projects

Thanks. Interesting ... On 6/27/26 19:58 Robert Arkiletian wrote: > Just wanted to let the core

Jun 27

Dibo, … Albrecht Schlosser7

Jun 26

Layout with autosizing or expanding spacer?

That is what I call a valuable and comprehensive information, thank you Albrecht-S! My next goal

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Layout with autosizing or expanding spacer?

That is what I call a valuable and comprehensive information, thank you Albrecht-S! My next goal

Jun 26

Karsten Pedersen, … Albrecht Schlosser59

Jun 15

[Fl_Flow] A new layout manager for FLTK

On Friday, October 29, 2021 at 10:58:13 PM UTC+1 Albrecht Schlosser wrote: > > As an aside, is

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[Fl_Flow] A new layout manager for FLTK

On Friday, October 29, 2021 at 10:58:13 PM UTC+1 Albrecht Schlosser wrote: > > As an aside, is

Jun 15

Jeffrey Ellis, … Albrecht Schlosser5

Jun 5

Adding an item to an Fl_Tile

On 6/5/26 14:07 'Matthias Melcher' via fltk.general wrote: So, I f your window is a desktop

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Adding an item to an Fl_Tile

On 6/5/26 14:07 'Matthias Melcher' via fltk.general wrote: So, I f your window is a desktop

Jun 5

pvr...@btinternet.com, … Jackk Sonn7

May 31

Drawing complex shapes: arcs with negative y-scaling factor.

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Drawing complex shapes: arcs with negative y-scaling factor.

May 31

duncan gibson, Greg Ercolano7

May 11

NNTP access to FLTK forums

On 1/25/26 02:06, Greg Ercolano wrote: On 1/25/26 00:40, duncan gibson wrote: I primarily use the

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NNTP access to FLTK forums

On 1/25/26 02:06, Greg Ercolano wrote: On 1/25/26 00:40, duncan gibson wrote: I primarily use the

May 11

david allen, … Albrecht Schlosser8

May 8

Something like an Fl_Output in a menubar

On 5/8/26 15:25 Brian Larsen wrote: On Friday, May 8, 2026 at 9:06:04 PM UTC+8 Albrecht-S wrote: On 5

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Something like an Fl_Output in a menubar

On 5/8/26 15:25 Brian Larsen wrote: On Friday, May 8, 2026 at 9:06:04 PM UTC+8 Albrecht-S wrote: On 5

May 8

Wayne Rogers, … Gonzalo Garramuno4

May 8

Unable to Get FLTK Program to Compile

Thanks. That worked. On Thursday, May 7, 2026 at 8:33:54 PM UTC-4 ggar...@gmail.com wrote: For simple

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Unable to Get FLTK Program to Compile

Thanks. That worked. On Thursday, May 7, 2026 at 8:33:54 PM UTC-4 ggar...@gmail.com wrote: For simple

May 8

Michele Alessandrini, … Jackk Sonn3

May 8

Menu: spacing between text and shortcut

Looking into it On Friday, May 8, 2026 at 9:35:17 AM UTC+1 Michele Alessandrini wrote: Hi, menu items

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Menu: spacing between text and shortcut

Looking into it On Friday, May 8, 2026 at 9:35:17 AM UTC+1 Michele Alessandrini wrote: Hi, menu items

May 8

Lucas Sanner, … Albrecht Schlosser7

May 6

Make a window locked and not resizable ?

On 5/6/26 11:29 Lucas Sanner wrote: > So I think my best bet is to leave the window behavior as it

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Make a window locked and not resizable ?

On 5/6/26 11:29 Lucas Sanner wrote: > So I think my best bet is to leave the window behavior as it

May 6

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

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

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