Ampersand (&) appeared when clicking a button

MasterBlade

Hello I am using ampersands in QPushbotton for shortcut. They normally don't appear. But when I click a button, they all showed up.

During my debugging, I found that it is a ComboBox that triggered this. I want to align text in that combobox to center. So I copied a code from someone. If I disable that code, everything will be alright.

So what's the problem with this code?

class AlignDelegate: public QStyledItemDelegate{
public:
    AlignDelegate(Qt::Alignment alignment, QObject* parent = nullptr):
        QStyledItemDelegate(parent), m_alignment(alignment)
    {

    }
protected:
    void initStyleOption(QStyleOptionViewItem* option, const QModelIndex& index) const
    {
        QStyledItemDelegate::initStyleOption(option, index);
        option->displayAlignment = m_alignment;
    }
    Qt::Alignment m_alignment;
};

class AlignComboBoxProxy: public QProxyStyle{
public:
    using QProxyStyle::QProxyStyle;
    void drawItemText(QPainter* painter, const QRect& rect, int, const QPalette& pal,
                      bool enabled, const QString& text, QPalette::ColorRole textRole) const
    {
        QProxyStyle::drawItemText(painter, rect, Qt::AlignCenter, pal, enabled, text, textRole);
    }
};

For the combobox, I used

QComboBox* cb = new QComboBox(this);
cb->setStyle(new AlignComboBoxProxy(cb->style()));
cb->addItems(strl);
cb->setCurrentText(SubList.at(i + i + 1));
cb->setItemDelegate(new AlignDelegate(Qt::AlignCenter, cb));

SGaist

Hi,

What version of Qt are you using ?
On what platform ?

mrjj

Hi
I could reproduce it.
Seems to come from doing
cb->setStyle(new AlignComboBoxProxy(cb->style()));
and if i do
cb->setStyle( new AlignComboBoxProxy() );

The & is no longer shown. (before you press alt )

Im not sure what it does with the QStyle given but it does seem then to affect other widgets even you just assign it to the combo.

MasterBlade

@SGaist said in Ampersand (&) appeared when clicking a button:

Hi,

What version of Qt are you using ?
On what platform ?

Qt 5.15.0-rc with MSVC 2019 on Win10

SGaist

Did you check the solution of @mrjj ?

MasterBlade

@SGaist Yep that's working. I've already reported this.
https://bugreports.qt.io/browse/QTBUG-84185

SGaist

Can you add a minimal compilable example to the bug report please ? That will allow the developer to more easily test your issue as well as test the corresponding fix.