turn off elide in column of qtablewidget

[sawarsi]

Hello,

i have a table widget derived from QTableWidget and first i tried the following:
setTextElideMode(Qt::ElideNone) in the constructor and this did not work. so i setup a delegate as:

class elideNoneItemC : public QStyledItemDelegate
{
virtual void paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QStyleOptionViewItem opt = option;
opt.textElideMode=Qt::ElideNone;
QStyledItemDelegate::paint(painter, opt, index);
}
};

elideNoneItemC *elidenone = new elideNoneItemC;

and then setItemDelegateForColumn(1,elidenone); for the second column but the text in the second column (if sufficiently long) still displays the ellipses.

any idea what may be wrong.

[eyllanesc]

@sawarsi You have to override the initStyleOption method

class StyledItemDelegate: public QStyledItemDelegate
{
public:
    using QStyledItemDelegate::QStyledItemDelegate;
protected:
    void initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const override
    {
        QStyledItemDelegate::initStyleOption(option, index);
        option->textElideMode = Qt::ElideNone;
    }
};

[sawarsi]

@eyllanesc thanks i tried what u suggested but i am still getting the ellipses. so i don't need to have the paint function at all?

[JonB]

@eyllanesc
How do we know which QStyleOptionViewItem things to do in initStyleOption() versus what @sawarsi tried to do in the paint() override?

Ah, I see it says:

When reimplementing paint in a subclass. Use the initStyleOption() to set up the option in the same way as the QStyledItemDelegate.

but not sure I understand "in the same way as"?

Given that paint() takes a const QStyleOptionViewItem &option, are you not supposed to alter it and pass it on as he did? Is the option intended to be read-only at this stage?

[eyllanesc]

@JonB

paint receives the option but then modifies it by invoking the initStyleOption. If you want to know how a class works then it is better to check the source code: https://code.qt.io/cgit/qt/qtbase.git/tree/src/widgets/itemviews/qstyleditemdelegate.cpp?h=dev#n377

void QStyledItemDelegate::paint(QPainter *painter,
        const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    Q_ASSERT(index.isValid());

    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index); // <--- update option

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

@sawarsi you should not modify the paint method

[sawarsi]

@eyllanesc yes i removed the paint function entirely and used your suggestion and i am still seeing ellipses.

[eyllanesc]

@sawarsi Could you provide a minimum reproducible example? Maybe the error is another.

[sawarsi]

@eyllanesc ok i will see if i can setup a simple example

[JonB]

@sawarsi Also before you start put a breakpoint/debug message into your code to make 100% sure your override is getting called.

[sawarsi]

@JonB yes it is getting hit.

[sawarsi]

@JonB what i did notice in the debugger is that each of the cells in the second column i have put in text but when i print the text in initStyleOption then it is always "".

so is setItemDelegateForColumn(1,...) the correct way of doing this?

[sawarsi]

@sawarsi nevermind it was my fault your suggestion is flawless.

[sawarsi]

@eyllanesc thanks for the help.

[sawarsi]

@sawarsi one thing i did notice is that this works just fine in linux but fails on windows any hints?

[sawarsi]

@eyllanesc one thing i did notice is that this works just fine in linux but fails on windows any hints?

[eyllanesc]

@sawarsi As can be seen in the source code of "paint", the QStyle is used to make the painting, so the style probably does not use some option properties, a possible solution is to use another style like: app.setStyle("fusion" );

[sawarsi]

@eyllanesc i tried all the Windows styles (Windows and Fusion) and neither worked it may be that Windows mandates ellipses. i am not sure anyway, i am going to mark this solved.

[CEO.]

@eyllanesc I admire you a lot. This is one of the best ways for an informed person to respond to a question. Anyone asking question is usually confused and an illustrative answer is the best. I notice you always go out of your way to give a practical example. Honestly if you have a class where you teach students, I would love to be one of your students.

Thank you very much.