How to change the Text Color of a List Item ?

[Sphinkie]

Hello

I am trying to change the color of a text in a ListView.
I can change the text color of a Qlabel, for instance, not for a item in a list...

Currenltly, my code is the following:

QListWidgetItem* w = ui->w_MessageList->item(2);

w->setBackgroundColor(QColorConstants::Svg::plum);   // This change background color. It is deprecated but it works.

// Attempt to change the foreground (text) color
QBrush b = w->foreground().style();       // get the brush of the text
b.setColor(QColorConstants::Svg::pink);   // change the brush
w->setForeground(b);                      // apply the brush

But the text is still black.
Can you help on how to use the Qbrush (or the Qstyle) ?

Thanks

[SGaist]

Hi and welcome to devnet,

What version of Qt ?
What OS ?
Can you provide a minimal compilable example that shows that behavior ?

[Sphinkie]

Hello @SGaist ,
Here is the minimal compilable code (Qt 5.15 under Windows):
With this program, I create a list and add 3 items.
Then, I try to change the ForegroundColor of an item, to make the text appear Red, but all the texts of the 3 items remain black.
I don't undertand why.
Thanks for your help.

#include <QApplication>
#include <QListWidget>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QWidget fenetre;
    fenetre.setFixedSize(320, 320);

    QListWidget w_MessageList(&fenetre);

    w_MessageList.addItem("first list item");
    w_MessageList.addItem("second list item");
    w_MessageList.addItem("third list item");

    // Attempt to change the color of the text of the second item.
    QListWidgetItem* w = w_MessageList.item(1);
    QBrush b = w->foreground().style();      // get the brush
    b.setColor(QColorConstants::Red);        // change the brush
    w->setForeground(b);                     // apply the brush


    // w->setBackgroundColor(QColorConstants::Yellow);  // this change the background color (deprecated by Qt)

    fenetre.show();
    return a.exec();
}

[Bonnie]

@Sphinkie Hello
I'm not sure what is your QColorConstants::Red.
But I've tested your code withQt::red and it works, the second item's text is red.

And setBackgroundColor is deprecated because since 4.2 we should use setBackground.
Also, you could directly pass a QColor object as a QBrush parameter.

w->setForeground(QColor(Qt::red));
w->setBackground(QColor(Qt::yellow));

[Sphinkie]

@Bonnie said :

w->setForeground(QColor(Qt::red));
w->setBackground(QColor(Qt::yellow));

Thank you. This works very well.

(and also:

w->setForeground(QColor(QColorConstants::Red));
w->setBackground(QColor(QColorConstants::Yellow));

Colors are from https://doc.qt.io/qt-5/qcolorconstants.html

[Bonnie]

@Sphinkie
Wow, I had not noticed there is such a namespace since I'm still mainly using 5.12.
If the constants are QColor objects as the doc says, then you should be able to use them directly like

w->setForeground(QColorConstants::Red);
w->setBackground(QColorConstants::Yellow);