customcommand: add stylesheet to structured output

[elviosak]

added stylesheet to structured output and changed handling of textColor so it doesn't conflict with it.

whatsthis text:

test script with Continuous output checked and Structured selected in Output format:

i=0;
while true; do
if [ $i -ge 10 ]; then i=0; fi;
style=$(echo "QToolButton{border: 2px solid white;border-radius: 6px;font-family:Monospace;color: black; \
    background-color: qlineargradient(x1: 0, y1: 0, x2: 1, y2: 0,stop:0 green, stop:0.$i white, stop:1 red);}" \
    | base64 -w0);
echo "stylesheet:$style text:$(echo -n $i | base64 -w0)"; ((i++))
sleep 0.2
done

stylesheet-2025-10-10_07.25.23.mp4

[palinek]

I'm just wondering. Can the input be somehow validated? @tsujan do you know of any method for qss validation?

[tsujan]

@tsujan do you know of any method for qss validation?

No, have never done it.

But it's up to the user to provide a valid stylesheet; isn't it? Unless a bad situation (like hang or crash) happens with an invalid one.

Unrelated: IMHO, it's also good to check CPU/memory usage with such usages.

[elviosak]

I found this https://github.com/KDABLabs/qsslint/blob/master/main.cpp

Apparently uses #include <QtGui/private/qcssparser_p.h> but i think this was made for Qt5

[elviosak]

#include <QtGui/private/qcssparser_p.h>

...

const QString qss = QString::fromUtf8(value);
QCss::Parser parser(qss);
QCss::StyleSheet ss;
if (parser.parse(&ss)){
    mButton->setStyleSheet(qss);
}

that seems to work, but it requires
target_link_libraries(mytarget PRIVATE Qt6::GuiPrivate) from this https://doc.qt.io/qt-6/qtguiprivate-module.html
i don't know where to add it so i put it in BuildPlugin.cmake to test it, but that doesn't seem like a good idea, i think.

https://github.com/qt/qtbase/blob/dev/src/gui/text/qcssparser.cpp link to source i'm using to try to understand how to use it.

[tsujan]

I really doubt that we need to verify that a stylesheet is valid. It's Qt's job to do so, as that's the case anywhere a stylesheet is used (e.g., LXQt themes).

[elviosak]

yeah it's probably fine to not check it,