change color of a QComboBox line

[ludoQtCreator]

How to change the color of a row in a QComboBox?

#include "modifcons.h"
 
ModifCons::ModifCons()
{
    qDebug() << "modifcons";
 
    m_modifConsignes = new Consignes(QString("settings/consignes.ini"), QSettings::IniFormat);
 
    m_window2 = new QWidget;
    m_window2 ->setFixedSize(1000,600);
    m_window2 ->setWindowTitle("Modification Consignes Gainable");
    adjustSize();
 
    m_label2 = new QLabel(m_window2);
    m_label2 ->setPixmap(QPixmap("/home/ludo/Qt/test2/build/images/modifCons.jpg"));
    m_label2 ->showMaximized();
 
    select = new QComboBox(m_window2);
    select ->setGeometry(50,50,900,120);
    for (int i(0); i < 16; ++i)
    {
        select ->addItem(QString::number(i));
    }
    select ->setStyleSheet("font-size: 30px;");
    select ->setItemText(0,"Consigne Ete/Hiver :");
    select ->setItemText(1,"Consigne Canicule :");
    select ->setItemText(2,"Consigne Bloquage Chauffage :");
    select ->setItemText(3,"Consigne Mode Degivrage (Naturel ou Electrique) Chauffage :");
    select ->setItemText(4,"Consigne Grande Vitesse Ventilation Exterieur Chauffage :");
    select ->setItemText(5,"Consigne Grande Vitesse Ventilation Exterieur Froid :");
    select ->setItemText(6,"Consigne Fin Degivrage Chauffage :");
    select ->setItemText(7,"Consigne Depart Chauffage en Mode Chauffage :");
    select ->setItemText(8,"Consigne Depart Froid en Mode Chauffage :");
    select ->setItemText(9,"Consigne Petite Vitesse Ventilation Interieur Chauffage :");
    select ->setItemText(10,"Consigne Depart Froid en Mode Froid :");
    select ->setItemText(11,"Consigne Depart Chauffage en Mode Froid :");
    select ->setItemText(12,"Consigne Petite Vitesse Ventilation Interieur Froid :"); 
    select ->setItemText(13,"Consigne Depart Ventilation Interieur Chauffage :");
    select ->setItemText(14,"Consigne Lancement Degivrage Froid :");
    select ->setItemText(15,"Consigne Fin Degivrage Froid :");
 
    m_valid1 = new QPushButton("valid",m_window2);
    m_valid1 ->setGeometry(50,180,240,120);
    m_valid1 ->setStyleSheet("font-size: 30px;");
 
    m_quit1 = new QPushButton("quitter",m_window2);
    m_quit1 ->setGeometry(710,440,240,120);
    m_quit1 ->setStyleSheet("font-size: 30px;background-color: red");
 
    connect(m_valid1, &QPushButton::clicked, this, &ModifCons::selectCons);
    connect(m_quit1,&QPushButton::clicked,m_quit1,[this](){m_window2 ->close(); delete m_window2;});
 
    m_window2 ->show();
}

#include "modifcons.h"

ModifCons::ModifCons()
{
    qDebug() << "modifcons";
    
    m_modifConsignes = new Consignes(QString("settings/consignes.ini"), QSettings::IniFormat);
    
    m_window2 = new QWidget;
    m_window2 ->setFixedSize(1000,600);
    m_window2 ->setWindowTitle("Modification Consignes Gainable");
    adjustSize();
    
    m_label2 = new QLabel(m_window2);
    m_label2 ->setPixmap(QPixmap("/home/ludo/Qt/test2/build/images/modifCons.jpg"));
    m_label2 ->showMaximized();
    
    select = new QComboBox(m_window2);
    select ->setGeometry(50,50,900,120);
    for (int i(0); i < 16; ++i)
    {
        select ->addItem(QString::number(i));
    }
    select ->setStyleSheet("font-size: 30px;");
    select ->setItemText(0,"Consigne Ete/Hiver :");
    select ->setItemText(1,"Consigne Canicule :");
    select ->setItemText(2,"Consigne Bloquage Chauffage :");
    select ->setItemText(3,"Consigne Mode Degivrage (Naturel ou Electrique) Chauffage :");
    select ->setItemText(4,"Consigne Grande Vitesse Ventilation Exterieur Chauffage :");
    select ->setItemText(5,"Consigne Grande Vitesse Ventilation Exterieur Froid :");
    select ->setItemText(6,"Consigne Fin Degivrage Chauffage :");
    select ->setItemText(7,"Consigne Depart Chauffage en Mode Chauffage :");
    select ->setItemText(8,"Consigne Depart Froid en Mode Chauffage :");
    select ->setItemText(9,"Consigne Petite Vitesse Ventilation Interieur Chauffage :");
    select ->setItemText(10,"Consigne Depart Froid en Mode Froid :");
    select ->setItemText(11,"Consigne Depart Chauffage en Mode Froid :");
    select ->setItemText(12,"Consigne Petite Vitesse Ventilation Interieur Froid :"); 
    select ->setItemText(13,"Consigne Depart Ventilation Interieur Chauffage :");
    select ->setItemText(14,"Consigne Lancement Degivrage Froid :");
    select ->setItemText(15,"Consigne Fin Degivrage Froid :");

    m_valid1 = new QPushButton("valid",m_window2);
    m_valid1 ->setGeometry(50,180,240,120);
    m_valid1 ->setStyleSheet("font-size: 30px;");
    
    m_quit1 = new QPushButton("quitter",m_window2);
    m_quit1 ->setGeometry(710,440,240,120);
    m_quit1 ->setStyleSheet("font-size: 30px;background-color: red");
    
    connect(m_valid1, &QPushButton::clicked, this, &ModifCons::selectCons);
    connect(m_quit1,&QPushButton::clicked,m_quit1,[this](){m_window2 ->close(); delete m_window2;});
    
    m_window2 ->show();
}

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[d_stranz]

You can try this:

select->setItemData( index, color, Qt::ForegroundRole );

select->setItemData( index, color, Qt::ForegroundRole );

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[ludoQtCreator]

You can try this:

select->setItemData( index, color, Qt::ForegroundRole );

select->setItemData( index, color, Qt::ForegroundRole );

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does not work

I want to change the color of:

select ->setItemText(1,"Consigne Canicule :");

select ->setItemText(1,"Consigne Canicule :");

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[d_stranz]

does not work

Sorry, I guess that is only used for setting custom data and not visual properties.

I think the only way to change the color of an individual entry in a combo box is the implement a custom QAbstractItemModel for the items you want to add, and use your model's QAbstractItemModel::data() method to return the colors you want using the Qt::ForegroundRole role. You should study the Qt Model / View architecture to learn about this.

[ludoQtCreator]

Sorry, I guess that is only used for setting custom data and not visual properties.

I think the only way to change the color of an individual entry in a combo box is the implement a custom QAbstractItemModel for the items you want to add, and use your model's QAbstractItemModel::data() method to return the colors you want using the Qt::ForegroundRole role. You should study the Qt Model / View architecture to learn about this.

when I do this it works:

select ->setItemData(1, QColor(255, 175, 0), Qt::TextColorRole);

select ->setItemData(1, QColor(255, 175, 0), Qt::TextColorRole);

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but I get a warning:

[ 11%] Building CXX object CMakeFiles/test.dir/modifcons.cpp.o
/home/ludo/Qt/test2/modifcons.cpp: In constructor 'ModifCons::ModifCons()':
/home/ludo/Qt/test2/modifcons.cpp:27:54: warning: 'Qt::TextColorRole' is deprecated [-Wdeprecated-declarations]
27 | select ->setItemData(1, QColor(255, 175, 0), Qt::TextColorRole);
| ^~~~~~~~~~~~~
In file included from /usr/include/aarch64-linux-gnu/qt5/QtCore/qobjectdefs.h:48,
from /usr/include/aarch64-linux-gnu/qt5/QtCore/qobject.h:46,
from /usr/include/aarch64-linux-gnu/qt5/QtCore/qabstractanimation.h:43,
from /usr/include/aarch64-linux-gnu/qt5/QtCore/QtCore:6,
from /usr/include/aarch64-linux-gnu/qt5/QtWidgets/QtWidgetsDepends:3,
from /usr/include/aarch64-linux-gnu/qt5/QtWidgets/QtWidgets:3,
from /home/ludo/Qt/test2/modifcons.h:4,
from /home/ludo/Qt/test2/modifcons.cpp:1:
/usr/include/aarch64-linux-gnu/qt5/QtCore/qnamespace.h:1547:9: note: declared here
1547 | TextColorRole Q_DECL_ENUMERATOR_DEPRECATED = ForegroundRole,

[ludoQtCreator]

It's good, I found it
select ->setItemData(2, QColor(255, 0, 0), Qt::ForegroundRole);
so solved thanks