# [Ipe-discuss] LaTeX code unreadable in Edit Text Object window on a dark theme

Soeren Nickel soeren.nickel at ac.tuwien.ac.at
Wed May 26 22:37:52 CEST 2021

I am also working on Mint, using a dark Theme and was bothered by that
in the past. I tried to use qt5ct to define a stylesheet, which takes
care of that, but only plain text (i.e. the text, which was previously
uncolored) reacted to it. A colleague of mine looked into it. He found
that the file /ipeui/ipeui_qt.cpp contains

void LatexHighlighter::highlightBlock (see attached image)

which defines the hardcoded mathFormat and tagFormat, which was already
mentioned. Plain text is not adressed here, which is probably, why it
reacted to the qt stylesheet. I would assume, if you change the defined
colors in this file and recompile, then this issue should be resolved.

Best,
Soeren

On 26.05.21 19:51, Otfried Cheong via Ipe-discuss wrote:
> On Wed, May 26, 2021, at 09:52, Manoj Baishya via Ipe-discuss wrote:
>> I am using Ipe v7.2.20 on LinuxMint 20.1 with a dark theme. When
>> inserting LaTeX labels on a diagram, the math symbols code text (for ex,
>> "\sigma_t", "\alpha_p", etc) in the editor area of the "Edit Text
>> Object" window is highlighted in a dark blue colour, making it
>> unreadable and I have to squint my eyes to see what I have typed :) Is
>> it possible to change the math code highlight colour to match the dark
>> theme? Eg. through the Qt5 settings window, I may be able to set font
>> colour properties in a custom .qss using the class of the math code
>> text. This is a minor annoyance but nonetheless some pointers will be
>> appreciated!
> I'm afraid these colours are currently hardcoded.  It should probably be changed to take colours from the current theme.
>
> Somehow this has been overlooked so far, I guess the dark mode is not used that much.
>
> Cheers,
>    Otfried
>
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