How to visualize model data in different ways in QTableView?

Question

I have a model containing in one column floats (ex: 22.7). Now, I want that in QTableView, it will be visualized together with the unit (MB): 22.7 MB. The reason I am doing so is because I want that sorting is based on floats, but the visualization is as I said with units.

I created a Model, a Filter and a View. But it does not work. Here is a piece of my code:

QStandardItemModel* model = new QStandardItemModel(this);
QSortFilterProxyModel *filterModel = new QSortFilterProxyModel(0);
filterModel->setSourceModel(model);

QStandardItem* vSItem6 = new QStandardItem();
vSItem6->setData(22.7, Qt::DisplayRole); 
model->setItem(1, 7, vSItem6);
QModelIndex index = model->index(1, 7, QModelIndex());
QString itext = model->data(index, Qt::DisplayRole).toString(); 
filterModel->setData(index, itext + " MB", Qt::DisplayRole);


mUi.tableView->setModel(filterModel);
mUi.tableView->setSortingEnabled(true);
mUi.tableView->show();

Everything seems to be fine, but in QTableView, only the float number is visualized (without the unit MB). Can anybody please help me? Thanks

Answer 1

I know your question was about QTableView, but it might be easier if it is the only thing you want to display (I don't know your objectives) to use a QTableWidget with a QDoubleSpinBox since it has a method that allows you to set a suffix to the value that is displayed.

In your case, it would be:

QDoubleSpinBox* spin = new QDoubleSpinBox();
spin->setSuffix("MB");

Note that the range is set by default from 0.0 to 99.99 so if you want to set other values you should change the range before.

Hope this helps.

Answer 2

Have a look at setItemDelegate or setItemDelegateForColumn. You can derive your delegate class from QStyledItemDelegate, and in the overridden paint method you can paint your numbers including the units.