Set QComboBox popup's size

MykolaQt

Hello,

I'm trying to make an comboBox, based on QComboBox.
I've overloaded paintEvent and it paints well.

Now, I'm trying to elide text inside the popup.
I've overloaded a delegate and it works well, looks elided and shofter.
However, I can't set the popup's width and it's not resized, it's ugly.
What can I do?

Знімок екрана 2021-10-19 111425.png

MykolaQt

[Continuation of description]

This is my Combo class

void ComboWithElision::paintEvent(QPaintEvent *)
{
    QStyleOptionComboBox option;
    initStyleOption(&option);

    QStylePainter painter(this);
    painter.drawComplexControl(QStyle::CC_ComboBox, option);

    auto comboRect =
        style()->subControlRect(QStyle::CC_ComboBox, &option, QStyle::SC_ComboBoxEditField, this);
    comboWidth = comboRect.width(); //we store the width for the delegate
    option.popupRect.setWidth(comboWidth);// I hoped that this would set size, no influence

    option.currentText =
        painter.fontMetrics().elidedText(option.currentText, Qt::ElideRight, comboWidth);

    painter.drawControl(QStyle::CE_ComboBoxLabel, option);
}

Attemts with showPopup()

void ComboWithElision::showPopup()
{
    //    A. Shows truncated delegates, popup field is still wide
        QAbstractItemView *popupView = view();
        popupView->setTextElideMode(Qt::TextElideMode::ElideMiddle);//no effect
        popupView->setGeometry(popupView->x(), popupView->y(), 100, popupView->height());

    //    B. Shows truncated delegates, popup field is still wide
        this->view()->setMaximumWidth(100);

    QComboBox::showPopup();
}

This is the delegate:


void DelegateClass::paint(QPainter *painter, const QStyleOptionViewItem &option,
                                              const QModelIndex &index) const
{
    if (!index.isValid())
        return;

    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);

    opt.textElideMode = Qt::ElideRight;

    auto *text = &opt.text;
    auto *fontMetrics = &opt.fontMetrics;
    *text = fontMetrics->elidedText(*text, Qt::ElideRight, _parentComboWidth + 15.0);

    const QWidget *widget = option.widget;
    QStyle *style = widget ? widget->style() : QApplication::style();
    style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, widget);

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

MykolaQt

I found the solution!

void ComboWithElision::showPopup()
{
    view()->window()->setFixedWidth(100);
    QComboBox::showPopup();
}

so the solution is view()->window() instead of view()