Changing QCheckBox indicator rectangle color

Question

I'm trying to change only the color of QCheckBox indicator rectangle.

Currently I succeed to draw the right and the bottom line of the rectangle. Probably I'm doing something wrong here.

Here is my code:

CheckBoxWidget.cpp

CheckBoxWidget::CheckBoxWidget(QObject *poParent)
    : QItemDelegate(poParent)
{
}

void CheckBoxWidget::drawCheck( QPainter *painter,
                                const QStyleOptionViewItem &option,
                                const QRect & rect,
                                Qt::CheckState state) const
{
    QRect oCheckBoxRect =
            QApplication::style()->subElementRect( QStyle::SE_CheckBoxIndicator, &option);

    painter->setPen(Qt::white);
    painter->drawRect(oCheckBoxRect);

    QItemDelegate::drawCheck(painter, option, oCheckBoxRect, state);
}

CheckBoxWidget.h

class CheckBoxWidget : public QItemDelegate
{
    Q_OBJECT

public:
    CheckBoxWidget(QObject *poParent = 0);
    virtual ~CheckBoxWidget();

protected:
    virtual void drawCheck( QPainter *painter,
                            const QStyleOptionViewItem &option,
                            const QRect &,
                            Qt::CheckState state) const;
};

Any suggestions ?

Answer 1

There is no need to create a custom delegate for this. You could use stylesheets in order to change the color of the checkbox or any othe widget as you wish. The following stylesheet will set a gray 3px border to the checkbox rectangle.

QCheckBox::indicator {
    border: 3px solid #5A5A5A;
    background: none;
}

In order to set the stylesheet you could either use the Qt Designer or the setStylesheet function.

In order to set a specific color all of the following are valid:

border: 3px solid #5A5A5A;
border: 3px solid red;
border: 3px solid rgb(255, 120, 100);
border: 3px solid rgba(255,120,100, 50); // For alpha transparency