Quick Question:Why my TableView appears blank?!

[fatecasino]

MyDialog::MyDialog(QWidget *parent)
    : QWidget(parent)
{
    QStandardItemModel model(4, 2);
    tableView = new QTableView(this);
    tableView->setModel(&model);
 
    ComboBoxDelegate delegate;
    tableView->setItemDelegateForColumn(1,&delegate);
 
    for (int row = 0; row < 4; ++row) {
        for (int column = 0; column < 2; ++column) {
            QModelIndex index = model.index(row, column, QModelIndex());
            model.setData(index, QVariant((row+1) * (column+1)));
        }
    }
    view2 = new QTableView(this);
    view2->setModel(&model);
    view2->setItemDelegateForColumn(1,&delegate);
 
    for (int row = 0; row < 4; ++row) {
        for (int column = 0; column < 2; ++column) {
            QModelIndex index = model->index(row, column, QModelIndex());
           model->setData(index, QVariant((row+1) * (column+1)));
       }
   }
 
    vboxlayout = new QVBoxLayout(this);
    vboxlayout->addWidget(tableView);
    vboxlayout->addWidget(view2);
 
    setLayout(vboxlayout);
}

MyDialog::MyDialog(QWidget *parent)
    : QWidget(parent)
{
    QStandardItemModel model(4, 2);
    tableView = new QTableView(this);
    tableView->setModel(&model);

    ComboBoxDelegate delegate;
    tableView->setItemDelegateForColumn(1,&delegate);

    for (int row = 0; row < 4; ++row) {
        for (int column = 0; column < 2; ++column) {
            QModelIndex index = model.index(row, column, QModelIndex());
            model.setData(index, QVariant((row+1) * (column+1)));
        }
    }
    view2 = new QTableView(this);
    view2->setModel(&model);
    view2->setItemDelegateForColumn(1,&delegate);

    for (int row = 0; row < 4; ++row) {
        for (int column = 0; column < 2; ++column) {
            QModelIndex index = model->index(row, column, QModelIndex());
           model->setData(index, QVariant((row+1) * (column+1)));
       }
   }

    vboxlayout = new QVBoxLayout(this);
    vboxlayout->addWidget(tableView);
    vboxlayout->addWidget(view2);

    setLayout(vboxlayout);
}

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---

Added after 1 12 minutes:

found it!!

In the header file I have:

private:
    QStandardItemModel*  model;

private:
    QStandardItemModel*  model;

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In the source I had written:

QStandardItemModel model(4, 2);
    tableView->setModel(&model);

QStandardItemModel model(4, 2);
    tableView->setModel(&model);

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BUT it should be:

model = new QStandardItemModel(4, 2);
    tableView->setModel(model);

model = new QStandardItemModel(4, 2);
    tableView->setModel(model);

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[ChrisW67]

You have the same problem with your ComboBoxDelegate going out of scope at the end of the constructor.

[fatecasino]

You have the same problem with your ComboBoxDelegate going out of scope at the end of the constructor.

you are totally right!