Resize QTableView / QSqlQueryModel

[Gaalee]

Hi, i have 2 problems (sorry my english is bad, let me know if you don't understand).

1. Is their a way to use resizeColumnsToContents() and resizeSections(QHeaderView::ResizeMode::Stretch) at the same time ? Because if i used only resizeColumnsToContents it's like this (didn't feet the white space) :
   And if i used resizeSections(QHeaderView::ResizeMode::Stretch) it's like this (some columns are unnecessarily large and some need to be large to display their content) :

2. At initialization the table is not affected by the resize methodes, i tried to setVisible(0 and 1) between resize but it doesn't work. Did you have an idea ?

Thanks for helping me.

[VRonin]

1. http://doc.qt.io/qt-5/qheaderview.html#stretchLastSection-prop
2. could you try forcing a call to update() on the QTableView?

[Gaalee]

1. Result :
   
   It's still looking bad. Is their a way to set an equal stretch between each columns ? Like that :

2. Apparantly not.

[VRonin]

@Gaalee said in Resize QTableView / QSqlQueryModel:

It's still looking bad. Is their a way to set an equal stretch between each columns ? Like that :

setSectionResizeMode(QHeaderView::Stretch)

[Gaalee]

Doesn't work with resizeColumnsToContents().

[VRonin]

Ok, now I understood, you want to equally distribute the extra space among the remaining columns.

protected:
void resizeEvent(QResizeEvent *ev)
{
    QWidget::resizeEvent(ev);
    resizeHeaders();
}
Q_SLOT void resizeHeaders()
{
    QHeaderView* const tableHead = view->horizontalHeader();
    const int secCount = tableHead->count();
    if (view->model()->rowCount() == 0 || secCount<=1) {
        tableHead->resizeSections(QHeaderView::Stretch);
        return;
    }
    tableHead->resizeSections(QHeaderView::ResizeToContents);
    QVector<int> allHints(secCount);
    for (int i = 0; i < secCount; ++i)
        allHints[i]= tableHead->sectionSize(i);
    const int extraSpace = tableHead->width() - std::accumulate(allHints.constBegin(), allHints.constEnd(), 0);
    for (int i = 0; i < secCount; ++i)
        tableHead->resizeSection(i, allHints.at(i) + static_cast<int>(static_cast<double>(extraSpace) / static_cast<double>(secCount)));
}

then in the constructor add

view->horizontalHeader()->setSectionResizeMode(QHeaderView::Fixed);
view->horizontalHeader()->setStretchLastSection(true);
connect(model, &QAbstractItemModel::rowsRemoved, this, &QuoteViewer::resizeHeaders);
    connect(model, &QAbstractItemModel::dataChanged, this, &QuoteViewer::resizeHeaders);
    resizeHeaders();

This will distribute the extra space evenly, not based on the original size, it's trivial to modify the math to achieve this other result btw