Using Qt private CSS parser

[IMAN4K]

@SGaist

You would have to enable the use of the private parts of Qt with all the big fat warnings that comes with it.

I already compile it (and also disable warnings) :

int main() {
    QString css = "RadioButton {"
                    "color:#009688;"
                    "font-size:12pt;"
                    "opacity:0.5;"
                    "}";
    QCss::Parser parser(css);
}

But at this time i want to get the color value (#009688) of RadioButton but the source code of this parser is complicated (may be i should make the parse tree)

Why do you want to parse your css since you already know what's in it ?

Because i want to read an external CSS file and get my app's widgets properties from it.
For example : in my RadioButton painting i use an opacity value and when i change the opacity from CSS file all RadioButton must be change to new opacity.

[SGaist]

Then why not just set that external style sheet directly ?

[IMAN4K]

@SGaist
Well.
We assigned stylesheet :

class RadioButton : public QAbstractButton
{
public:
	RadioButton() {
		QString css = "RadioButton {"
							"color:#009688;"
							"font-size:12pt;"
							"opacity:0.5;"
							"}";
		setStyleSheet(css);
	}
};

But the problem is accessing the values So how we should get opacity :
QPainter::setOpacity(/* required opacity */);

[kshegunov]

@IMAN4K

Isn't the windowOpacity property holding that?

[IMAN4K]

@kshegunov
No. it return 1

[SGaist]

Are you doing all the painting yourself ?

[IMAN4K]

@SGaist
yes

[SGaist]

What attributes are you going to support ?

[Devopia53]

@IMAN4K said:

Now i'm going to retrieve RadioButton's properties from Style.css
for that after some searching i found Qt private CSS scanner and parser :
qcssscanner.cpp
qcssparser_p.h
qcssparser.cpp

And now i don't know how to use this parser to get token types + values

Hi.

Something like this... Not recommended...

#include <QtGui/5.7.0/QtGui/private/qcssparser_p.h>

[...]
QCss::Parser parser(yourStyleSheetString);

while (parser.testSelector()) {
    QCss::StyleRule styleRule;

    if (parser.parseRuleset(&styleRule)) {
        foreach (auto sel, styleRule.selectors) {
            foreach (auto bSel, sel.basicSelectors) {
                qDebug() << "BasicSelector:" << bSel.elementName;
            }
        }

        foreach (auto decl, styleRule.declarations) {
            qDebug() << "property:" << decl.d->property;
            foreach (auto value, decl.d->values) {
               qDebug() << "value:" << value.variant;
            }
        }
    }
}
[...]

[IMAN4K]

@Devopia53
Excellent answer :)

Not recommended...

Yeah know it and i make these files local in my project (not include from <private/qcssparser_p.h>):
qcssscanner.cpp
qcssparser_p.h
qcssparser.cpp

Thank you