How to select a specific entire colum of a QTableView - c++

Question

I have a QTableView with three columns like the example below:
| Id | name | ACoord |
I am trying to highlight the entire ACoord column no matter which cell I am clicking on in the ACoord only.
I have tried several examples but nothing is helpful.
The most promising (also from official QT documentation) seems to be setSelectionBehavior(QAbstractItemView::SelectColumns) but didn't work exactly as I need.
Here is the snipped of code:
connect(mTurnIntoExcelData, &QAction::triggered, [&]() {
int row = -1, column = -1;
QString reference;
QString type;
QModelIndex index;
int rowModel = index.row();
SelectionData currentData;
for(int i = 0; i < ui->tableViewLeft->model()->columnCount(); i++)
{
if(ui->tableViewLeft->model()->headerData(i, Qt::Horizontal).toString() == "ACoord") {
column = i;
ui->tableViewLeft->setSelectionBehavior(QAbstractItemView::SelectColumns);
ui->tableViewLeft->setSelectionMode(QAbstractItemView::SingleSelection);
type = "ACoord";
}
The expected result is: I click on any cell of the ACoord and the entire column becomes selectable.
However, the actual result is that if I click on any cell of ACoord column I am not able to select the entire column, but only the single cell.
Thanks for any insight.

Answer 1

I don't know if this is the most elegant way to do it, but I was able to get (what I believe is) the behavior you want by modifying Qt's "FrozenColumn" example program (in $QTDIR/qtbase/examples/widgets/itemviews/frozencolumn) in the following way:
In freezetablewidget.h, add the following declarations inside the private slots: section:
void currentColumnChanged(const QModelIndex &);
void autoSelectMagicColumn();
In freezetablewidget.cpp, add a #include <QTimer> to the includes-section at the top, then add the following lines to the end of the FreezeTableWidget::init() method:
connect(frozenTableView->selectionModel(), SIGNAL(currentColumnChanged(const QModelIndex &, const QModelIndex &)), this, SLOT(currentColumnChanged(const QModelIndex &)));
connect(frozenTableView->selectionModel(), SIGNAL(currentRowChanged(const QModelIndex &, const QModelIndex &)), this, SLOT(currentColumnChanged(const QModelIndex &))); // optional
... and finally, add the following new lines into freezetablewidget.cpp:
const int magicColumnIndex = 2; // or whichever column you want the auto-selecting to happen on
void FreezeTableWidget::currentColumnChanged(const QModelIndex & mi)
{
const int col = mi.column();
if (col == magicColumnIndex)
{
// Auto-select the entire column! (Gotta schedule it be done later
// since it doesn't work if I just call selectColumn() directly at this point)
QTimer::singleShot(100, this, SLOT(autoSelectMagicColumn()));
}
}
void FreezeTableWidget::autoSelectMagicColumn()
{
// Double-check that the focus is still on the magic column index, in case the user moves fast
if (selectionModel()->currentIndex().column() == magicColumnIndex) frozenTableView->selectColumn(magicColumnIndex);
}
With the above changes, the FrozenColumn example app will auto-select the entire "YDS" column whenever I click on any cell in that column (or navigate to any cell in that column via the arrow keys). Perhaps you can do something similar in your program.