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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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9:03 AM

Double window: how can we detect the FL_SHOW event without subclassing?

> But it's so much better to just subclass Fl_Double_WIndow. Ok, it's straightforward

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Double window: how can we detect the FL_SHOW event without subclassing?

> But it's so much better to just subclass Fl_Double_WIndow. Ok, it's straightforward

9:03 AM

Oct 25

Server maintenance for Sunday Oct 25 2026

Work completed; upgraded the server. This necessarily changed the IP address: OLD IP: 173.230.155.139

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Server maintenance for Sunday Oct 25 2026

Work completed; upgraded the server. This necessarily changed the IP address: OLD IP: 173.230.155.139

Oct 25

Andre Steenveld

Oct 20

What are the 'Good FLTK coding habits'?

Dear all, While working with FLTK I sometimes ask myself what form to use. Or, what is the advised

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What are the 'Good FLTK coding habits'?

Dear all, While working with FLTK I sometimes ask myself what form to use. Or, what is the advised

Oct 20

Dibo, Matthias Melcher3

Oct 17

Fl::set_color and FL_SELECTION_COLOR doesn't work

It would probably be best to call Fl::args(argc, args) early, which loads a few desktop resources,

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Fl::set_color and FL_SELECTION_COLOR doesn't work

It would probably be best to call Fl::args(argc, args) early, which loads a few desktop resources,

Oct 17

Andre Steenveld, Albrecht Schlosser6

Oct 17

FLTK-Tutorial-for-Beginners v2 available.

Hi Albrecht, On 10/16/26 3:27 PM, 'Albrecht Schlosser' via fltk.general wrote: Great, thanks

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FLTK-Tutorial-for-Beginners v2 available.

Hi Albrecht, On 10/16/26 3:27 PM, 'Albrecht Schlosser' via fltk.general wrote: Great, thanks

Oct 17

danielc...@gmail.com, … Daniel G.6

Oct 12

FLTK wasm build

here is a working compile .sh function for wasm: _build_fltk_wasm() { local repo_url="https://

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FLTK wasm build

here is a working compile .sh function for wasm: _build_fltk_wasm() { local repo_url="https://

Oct 12

Basile Starynkevitch

Oct 11

FLTK 1.7 (Linux) and Boehm garbage collection

Hello all, Did anyone experimented FLTK (1.5 ....) with the Boehm conservative garbage collector? I

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FLTK 1.7 (Linux) and Boehm garbage collection

Hello all, Did anyone experimented FLTK (1.5 ....) with the Boehm conservative garbage collector? I

Oct 11

Vladimir Stefanovic, Greg Ercolano2

Oct 9

FLTK on Windows 10 on CodeBlocks

On 10/9/26 14:50, Vladimir Stefanovic wrote: Hi, How to instal FLTK on Windows 10 on CodeBlocks?

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FLTK on Windows 10 on CodeBlocks

On 10/9/26 14:50, Vladimir Stefanovic wrote: Hi, How to instal FLTK on Windows 10 on CodeBlocks?

Oct 9

pvr...@btinternet.com, imm2

Oct 7

Bringing a window to the top.

On Tue, 6 Oct 2026 at 20:02, Phil wrote: > > I am undertaking a process of removing critical

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Bringing a window to the top.

On Tue, 6 Oct 2026 at 20:02, Phil wrote: > > I am undertaking a process of removing critical

Oct 7

pvr...@btinternet.com, … Greg Ercolano5

Oct 5

Deficiencies in Fl_SVG_Image

From: 'Matthias Melcher' via fltk.general <fltkg...@googlegroups.com> Sent: Sunday,

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Deficiencies in Fl_SVG_Image

From: 'Matthias Melcher' via fltk.general <fltkg...@googlegroups.com> Sent: Sunday,

Oct 5

Basile Starynkevitch, … Rob McDonald4

Sep 29

Is FLTK (Linux, 1.5.0) usable in batch mode (without display)?

In addition to the way fluid approaches it, you can also design your program to have separation more

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Is FLTK (Linux, 1.5.0) usable in batch mode (without display)?

In addition to the way fluid approaches it, you can also design your program to have separation more

Sep 29

S ET, Matthias Melcher3

Sep 29

FLUID custom widget: the generated code seems troublesome

Yes, this solves the problem and avoid swapping code downstream. Thank you very much. Le mardi 29

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FLUID custom widget: the generated code seems troublesome

Yes, this solves the problem and avoid swapping code downstream. Thank you very much. Le mardi 29

Sep 29

Sep 28

Re: [fltk.general] Abridged summary of fltkgeneral@googlegroups.com - 10 updates in 1 topic

Lordy, if the OP is a newbie, I'm finished. Their code is better than mine after 14 years of

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Re: [fltk.general] Abridged summary of fltkgeneral@googlegroups.com - 10 updates in 1 topic

Lordy, if the OP is a newbie, I'm finished. Their code is better than mine after 14 years of

Sep 28

S ET, … Albrecht Schlosser10

Sep 27

Newbie: question about destruction of FLTK ojbects

On 9/27/26 16:45 S ET wrote: > cw->callback(OnMainWindowEvent, ...); That's exactly it. OK,

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Newbie: question about destruction of FLTK ojbects

On 9/27/26 16:45 S ET wrote: > cw->callback(OnMainWindowEvent, ...); That's exactly it. OK,

Sep 27

Boon, … Greg Ercolano11

Sep 17

Drag & Drop from Fl_Window to a browser

On 9/14/26 20:15, Boon wrote: I can't Drag and Drop a file from a Fl_Window to a web browser (eg.

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Drag & Drop from Fl_Window to a browser

On 9/14/26 20:15, Boon wrote: I can't Drag and Drop a file from a Fl_Window to a web browser (eg.

Sep 17

Andre Steenveld, … Albrecht Schlosser7

Sep 10

subject: resource problem in FLTK, bug?

On 9/10/26 11:40 Andre Steenveld wrote: On 9/10/26 10:39 AM, Ian MacArthur wrote: On Wednesday, 9

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subject: resource problem in FLTK, bug?

On 9/10/26 11:40 Andre Steenveld wrote: On 9/10/26 10:39 AM, Ian MacArthur wrote: On Wednesday, 9

Sep 10

Lucas Sanner, … Albrecht Schlosser5

Aug 29

Child widget's coordinates problem

On 8/29/26 17:50 Greg Ercolano wrote: On 8/29/26 01:25, Lucas Sanner wrote: Hi, I'm a bit

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Child widget's coordinates problem

On 8/29/26 17:50 Greg Ercolano wrote: On 8/29/26 01:25, Lucas Sanner wrote: Hi, I'm a bit

Aug 29

Aug 23

How to draw end ellipsis when text is too long?

On Fri, 21 Aug 2026, 17:04 Dibo wrote: I'm thinking also about clipping as a compromise. For

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How to draw end ellipsis when text is too long?

On Fri, 21 Aug 2026, 17:04 Dibo wrote: I'm thinking also about clipping as a compromise. For

Aug 23

Jon Cooper, … Greg Ercolano11

Aug 17

How to tell which widget called a function.

On 8/17/26 14:01, 'Jon Cooper' via fltk.general wrote: Thank you very much for the info. Lots

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How to tell which widget called a function.

On 8/17/26 14:01, 'Jon Cooper' via fltk.general wrote: Thank you very much for the info. Lots

Aug 17

Jon Cooper, … Brian Larsen14

Aug 15

Help with cursor callback.

Thank you very much. That does work perfectly!! On Saturday, 15 August 2026 at 04:35:07 UTC+1 Brian

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Help with cursor callback.

Thank you very much. That does work perfectly!! On Saturday, 15 August 2026 at 04:35:07 UTC+1 Brian

Aug 15

Dibo, … Manolo7

Aug 14

FLTK flickering on X11 depending on resolution

Yes, a lot of issues which I have to figure out if I want to stick to this build configuration. For

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FLTK flickering on X11 depending on resolution

Yes, a lot of issues which I have to figure out if I want to stick to this build configuration. For

Aug 14

Oliver Bailey, … imm28

Aug 8

MSYS64 Step by Step Build Instructions?

Hi Ian, Thanks for the insight on the feasibility of gaining freedom from Microsoft libraries. If I

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MSYS64 Step by Step Build Instructions?

Hi Ian, Thanks for the insight on the feasibility of gaining freedom from Microsoft libraries. If I

Aug 8

bat, … Ian MacArthur15

Aug 7

Paste into Fl_Input with mouse

On Wednesday, 5 August 2026 at 23:08:45 UTC+1 jonathanbart wrote: *Sob* 13 years have gone by (

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Paste into Fl_Input with mouse

On Wednesday, 5 August 2026 at 23:08:45 UTC+1 jonathanbart wrote: *Sob* 13 years have gone by (

Aug 7

Dibo, Matthias Melcher3

Aug 1

Fl_Radio_Round_Button - set_selection_color doesn't work when custom draw on FL_ROUND_DOWN_BOX

You are right. Found it: case _FL_ROUND_UP_BOX : // Radio button... draw_box(down_box(), x()+dx, y()+

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Fl_Radio_Round_Button - set_selection_color doesn't work when custom draw on FL_ROUND_DOWN_BOX

You are right. Found it: case _FL_ROUND_UP_BOX : // Radio button... draw_box(down_box(), x()+dx, y()+

Aug 1

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

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