[Qt-interest] Questions about table view and item delegates

[Christian Gagneraud]

On 01/22/2010 12:30 PM, Christian Gagneraud wrote:
> Hi all,
>
> I'm using a table view with spinbox delegate, I've based my code on
> http://doc.trolltech.com/4.6/itemviews-spinboxdelegate.html.
>
> I'm using SDK 2009.01 on Fedora 12.
>
> I've re-used "as is" spinboxdelegate.{cpp,h}, and my main() looks like
> this:
>
> int main(int argc, char *argv[])
> {
>       QApplication a(argc, argv);
>       MainWindow w;
>
>       /* Set-up the schedule table using spinbox delegate */
>       QTableWidget* widget = w.findChild<QTableWidget*>("tableSchedule");
>       int nrows = widget->rowCount();
>       int ncols = widget->columnCount();
>       QStandardItemModel model(nrows, ncols);
>       QTableView* view = widget;
>       view->setModel(&model);
>       SpinBoxDelegate delegate;
>       view->setItemDelegate(&delegate);
>       for (int row = 0; row<  nrows; ++row) {
>                for (int column = 0; column<  ncols; ++column) {
>                    QModelIndex index = model.index(row, column,
> QModelIndex());
>                    model.setData(index, QVariant(0));
>                }
>            }
>
>       w.show();
>       return a.exec();
> }
>
> The only noticeable difference (for me) between the example and my
> (simple) app is that the table view is embedded within a form designed
> with QtDesigner/QtCreator. As a consequence I use Mainwindow.show()
> instead of TableView.show() and I got the pointer to my QTableView via
> findChild().
>
> Problem 1:
> When I insert data into the model, they are not shown up in the view.
> For example, I'm expected to get my table filled with zeros, but
> instead I got an empty table. If i execute the unmodified example, it
> works as expected!

This one is fixed. Actually I was using a QTableWidget and the example 
uses a QTableView, the QTableWidget already contains a model, so I was 
overwriting it, now the code works:

     QTableWidget* widget = w.findChild<QTableWidget*>("tableSchedule");
     int nrows = widget->rowCount();
     int ncols = widget->columnCount();
     QAbstractItemModel* model = widget->model();
     QTableView* view = widget;
     SpinBoxDelegate delegate;
     view->setItemDelegate(&delegate);
     for (int row = 0; row < nrows; ++row) {
              for (int column = 0; column < ncols; ++column) {
                  QModelIndex index = model->index(row, column, 
QModelIndex());
                  model->setData(index, QVariant(0));
              }
          }

[...]
> Problem 3:
> When the user select several cells, or a whole column or row, I would
> like that changing the value of one of these cells change the value of
> all the selected cells. Again I didn't find any documentation on how
> to do this. Any help appreciated on that matter too.

I managed to solve problem #1 while working on this one, by tracing 
the dataChanged() signal, i realized that something was really wrong...


Thanks,
Chris

>
>
> Regards,
> Chris
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