@jdent said in How do I iterate across the columns of a QTableView so I can find the total width of the table?:

@Axel-Spoerl How can I get the vertical scrollbar of the QTableView?

Simply with verticalScrollBar()
cause QTableView inherits of QAbstractScrollArea ;)

@jaivardhanf said in How to change QTableView data based on selection in QComboBox.:

So below is my code.

Something seems to have gone wrong with the code tags, making it hard to read and potentially missing code.

Qt::ItemFlags LineModel::flags(const QModelIndex& index) const
{
return Qt::ItemIsEditable | QAbstractTableModel::flags(index);
}

Adding the ItemIsEditable flag doesn't matter if the goal isn't to edit the item through the view.

This is how I connect the signal and slot

connect(ui->lineClass, &QComboBox::currentTextChanged, this, &GetOptionsClass::TextChanged);

Verify that the slot is called when it should be, and that the arguments are as expected.

@ChrisW67 oh my god... Yes that was it thank you 😂

@VRonin
you knew what bro :D ^^ when the model gets data there's a values higher than the max of the progressbar that's why it takes the size of other columns ... when i set higher progressBarOption.maximum = 100;
problem solved
Thank you so much
without you i coudn't find it even if it was that easy

@artwaw
I'm not sure, but in addition to @SGaist you may also find you want to use https://doc.qt.io/qt-5/qabstractitemview.html#openPersistentEditor ?

@SGaist @JonB With inspiration from QTableWidget sources my approach for internal reordering is now to override dropEvent and in there use moveRows.

if (event->source() == this) { // It's an internal move, a solution based on overridden QAbstractItemModel::moveRows

That works for internal reordering.

It seems like QDrag::exec is supposed to return an action performed but I find no information on how the information about a successful drop shall get back to the source widget and also the call to QDrag::exec is buried deep within a mouse event handler for QAbstractItemView.

My solution is to also implement copy-or-move in an overridden dropEvent. First let the base class process the drop event. If accepted then check keyboard modifers. If not ctrl modifier, i.e. if move, then use the event source to find the source widget and call remove on the source widget.

You could set default sorting column to -1 by QHeaderView::setSortIndicator like this

yourTableView->horizontalHeader()->setSortIndicator(-1, Qt::AscendingOrder);

before running

yourTableView->setSortingEnabled(true);

because QTableView::setSortingEnabled uses QHeaderView::sortIndicatorOrder and QHeaderView::sortIndicatorSection to identify by which column should model be sorted.

Note that documentation of QHeaderView::setSortIndicator tells that not all models support setting sort column to -1 and may even crash in this case.

The answer in stackoverflow is correct.

Is there no other way to get notified when an Edit begins?

just declare and emit your custom signal in the delegate subclass

Remember 1 model can service multiple views so, normally, the model should not depend on the state of the view or delegate

Cześć,

QTableView to klasa widoku. Dane znajdują się w modelu i to z niego je wyciągasz, np.

QModelIndex komorka = jakisTableView->model()->index(wiersz, kolumna); QString tekst_komorki = komorka->data().toString(); QColor kolor_tekstu = komorka->data(Qt::ForegroundRole).value<QColor>(); QFont font_tekstu = komorka->data(Qt::FontRole).value<QFont>();

Ok I found the answer. I added
setAttribute(Qt::WA_PaintOutsidePaintEvent, true);
flag to the widget I am repainting

Yes. You can subclass QTreeView and override drawRow to draw anything you want - lines, shapes, text, pictures, whatever.
Sorry, I read tree view and you meant table view.
You can set an item delegate. Then you implement the delegate by subclassing QStyledItemDelegate and override the paint method in which you can draw whatever you need.