Change font size in fluid

[ed.vi...@gmail.com]

Hello

I am using FLTK1.4.1 and the fluid font is too small. My screen is 4864x2160. Is it possible to adjust the font size?

Cheers

Ed

[Albrecht Schlosser]

On 2/7/25 13:25 ed.vi...@gmail.com wrote:

I am using FLTK1.4.1 and the fluid font is too small. My screen is 4864x2160. Is it possible to adjust the font size?

Whether you can explicitly change the font size I don't know, but since FLTK 1.4 you can zoom the entire window with ctrl/+/-/0 as you can typically do in browsers. I hope this helps.

[Ian MacArthur]

On Friday, 7 February 2025 at 12:25:04 UTC ed.vi... wrote:

Hello

I am using FLTK1.4.1 and the fluid font is too small. My screen is 4864x2160. Is it possible to adjust the font size?

Generally, FLTK will try and read (from the OS) what display zoom factor to use, and adjust it's own zoom accordingly, at least on high-res displays, to try and make things come out the same size as other apps on that display...

I take it that is not working?

What OS are you running on, and what display zoom is set? What size do other applications appear?

That all said, with a recent version of fluid (e.g. 1.4.1, say) you should be able to go in to the menu: 

Edit -> Settings --> Layout and fix the font size there (I don't think that will "fix" fluid itself, but it should help for any apps you build... maybe!)

 

[ed.vi...@gmail.com]

Thanks. That helps a lot, but can it be automatic?

Cheers

Ed

[Manolo]

Le jeudi 13 février 2025 à 11:17:02 UTC+1, ed.vi...@gmail.com a écrit :

Thanks. That helps a lot, but can it be automatic?

Yes, you can define environment variable FLTK_SCALING_FACTOR to the desired

scaling factor (for example, 1.7), and any FLTK app will start and remain scaled by that factor.

[ed.vi...@gmail.com]

Hi

Unfortunately, none of the suggestions worked to increase the text size in fluid. Neither setting FLTK_SCALING_FACTOR or ctrl/+/-/0 changed anything.

Cheers

Ed

[ed.vi...@gmail.com]

Quick correction. They both work on my Intel  MacBook Pro as expected, but not on Ubuntu 24.04.3

Cheers

Ed

[Albrecht Schlosser]

On 11/19/25 21:22 ed.vi...@gmail.com wrote:

Quick correction. They both work on my Intel  MacBook Pro as expected, but not on Ubuntu 24.04.3

Please check the FLTK version. The version included in Ubuntu 24.04 is FLTK 1.3.8 which doesn't have the mentioned zoom features. Thus if you are using the FLTK version installed by the Ubuntu package manager (apt) these features are not available.

But that's only a guess...

[ed.vi...@gmail.com]

Hi

You are correct.

I always compile my own version but I was using 1.4.0 which did not work 1.4.4 does work.

Thanks

[Matthias Melcher]

1.4.0 will certainly work. Please check your versions. The only thing that was improved for app scaling was better support for international keyboards.

I do understand the issue though, and I am in the process of rearranging Fluid dialogs and increasing text and widget sizes. When Fluid was originally written, space saving was more important than readability.