QTableview column width is reset to default when model is change.

[Mr Pang]

Hi,
I have a qtableview, some columns has a long string. So I need to resize the width of column. But when model adds new item, or item is updated. The column width is reset to default. I don't want so.
How to due with this?

[raven-worx]

@Mr-Pang
first of all you need to be more specific.
What type of model? Custom implementation?
If it's a custom implemented model, do you call reset() whenever item data changes?

[Mr Pang]

@raven-worx
It is QStandardItemModel.

void MainWindow::updateModel(int row, Session *s)
{
    int i=0;
    QStringList stat;
    stat << "INACTIVE" << "ACTIVE" << "REJECTED";
    ue_list_model->setItem(row, i++, new QStandardItem(stat[s->getStat()]));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getImsi().getImsiString()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getApn().getApn()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getRFTeidC().getFTeid()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getDefaultBearer()->getRFTeidU().getFTeid()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getLFTeidC().getFTeid()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getDefaultBearer()->getLFTeidU().getFTeid()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getPaa().getPaa()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getRatType().getRatType()));
    ue_list_model->setItem(row, i++, new QStandardItem(s->getBearersEbi()));
    model_map[s] = ue_list_model->item(row);
    ue_list_model->item(row)->setData(QVariant::fromValue(s));

    for(int j=0;j<i;j++){
        ue_list_model->item(row, j)->setFlags(Qt::ItemIsSelectable|Qt::ItemIsEnabled|Qt::ItemNeverHasChildren);
    }
}

[raven-worx]

@Mr-Pang
why do you mix ue_list_model->setItem() when you already use ue_list_model->item() in the same function?`
I guess setting a new item leads to a model reset, whereas updating an existing item just triggers a data changed.

[Mr Pang]

@raven-worx
Here may insert a new row. If I want to add a new row, I will call this function with updateModel(ue_list_model->rowCount(), s);
So item may not existing yet.

[Barry Scott]

Does the column width reset when your app gets focus as well?

I am seeing this after updating from Qt 5.9.3 to Qt 5.9.4 on Fedora.

Barry

[Mr Pang]

@Barry-Scott
Oh, Yes. It a new bug in 5.9.4

[aha_1980]

@Mr-Pang @Barry-Scott

Have you already searched on bugreports.qt.io? if this bug is not reported yet, please do so.

thanks