How to prevent a QIcon from getting highlighted?

Daniella

I'm trying to prevent the icons set on a QComboBox to get highlighted when the mouse is currently over the item.

I tried to use QStyleItemDelegate and ignore the flag MouseOver but this approach stops the painter from painting the 'hovered' background of the item and it still draw the icon highlight.

What else i could try?

class ComboBoxDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    QComboBox* comboBox = nullptr;
    ComboBoxDelegate(QComboBox* comboBox) : QStyledItemDelegate(comboBox), comboBox(comboBox) {};

    void paint(QPainter* painter, const QStyleOptionViewItem& option,
        const QModelIndex& index) const override
    {
        QStyleOptionViewItem opt = option;
        // Check if the current item is hovered
        if (opt.state & QStyle::State_MouseOver)
            opt.state = QStyle::State_None;

        return QStyledItemDelegate::paint(painter, opt, index);
    }
};



class ComboBox : public QComboBox
{
public:
    ComboBoxDelegate* comboBoxDelegate = nullptr;
    ComboBox(QWidget *parent = nullptr) : QComboBox(parent)
    {
        comboBoxDelegate = new ComboBoxDelegate(this);
        setItemDelegate(comboBoxDelegate);
    }
}

SGaist

Hi,

The next step is to do the painting yourself.

Daniella

@SGaist isnt possible to disable the highlighting editing any option?

Bonnie

@Daniella Can't quite understand what does "highlighted" QIcon mean.
Could you explain better?

Daniella

@Bonnie add an icon to a QComboBox and move the mouse over it, the icon is highlighted/colored blue.

https://doc.qt.io/qt-6/qstyleoptionviewitem.html#showDecorationSelected-var

"This variable holds whether the decoration should be highlighted on selected items"

Even setting it false, it still highlights the icon, a bug?

class ComboBoxDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    QComboBox* comboBox = nullptr;
    ComboBoxDelegate(QComboBox* comboBox) : QStyledItemDelegate(comboBox), comboBox(comboBox) {};

    void paint(QPainter* painter, const QStyleOptionViewItem& option,
        const QModelIndex& index) const override
    {
        QStyleOptionViewItem opt = option;
        if (opt.showDecorationSelected)
            opt.showDecorationSelected = false;

        return QStyledItemDelegate::paint(painter, opt, index);
    }
};

SGaist

I might be wrong but if I understand the documentation correctly, it seems to talk about the drawing of things like the tree view branches rather than what is returned by the decoration role.

JoeCFD

@Daniella did you try stylesheet?
https://stackoverflow.com/questions/37765673/changing-hover-style-for-qcombobox

Daniella

@JoeCFD i have tried it now, it still highlight the icon.

The problem is not the text/item background, is the icon, it create a blue overlay (highlight) over the icons, and make difficult to understand/see them.

@SGaist see the comment of this question

JoeCFD

@Daniella how did you do it? set background color to green to see if you can change the color.

Verz Arius

QIcon icon(":/path_to_icon");
icon.addFile(":/path_to_icon", {}, QIcon::Selected);
listItem->setIcon(icon);

Tested on qt 5.15 in QListWidget.