QTableView not working as expected.

[junxuan]

Hi guys, im rather new to Qt and im following a book : Foudations of Qt Development. Im trying to use the QTableView to display data, but it doesnt seem to work, it only displays a empty viewer.

This is my constructor:

MainDialog::MainDialog(QWidget *parent)
    : QDialog(parent), ui(new Ui::MainDialog)
{
   // ui->setupUi(this);
    QTableView *table = new QTableView;
 
    QStandardItemModel model(5, 2);
    for (int row = 0; row < 5; ++row){
        for (int col = 0; col < 2; ++col){
            QStandardItem *item = new QStandardItem(QString("Row:%1, Column:%2").arg(row).arg(col));
 
            if (col == 0){
                for (int i = 0; i < 3; ++i){
                    item->appendRow(new QStandardItem( QString("Item %1").arg(i)));
                }
            }
 
            model.setItem(row, col, item);
        }
    }
 
    table->setModel(&model);
    table->show();
 
    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(table);
    setLayout(layout);
}

MainDialog::MainDialog(QWidget *parent)
    : QDialog(parent), ui(new Ui::MainDialog)
{
   // ui->setupUi(this);
    QTableView *table = new QTableView;

    QStandardItemModel model(5, 2);
    for (int row = 0; row < 5; ++row){
        for (int col = 0; col < 2; ++col){
            QStandardItem *item = new QStandardItem(QString("Row:%1, Column:%2").arg(row).arg(col));

            if (col == 0){
                for (int i = 0; i < 3; ++i){
                    item->appendRow(new QStandardItem( QString("Item %1").arg(i)));
                }
            }

            model.setItem(row, col, item);
        }
    }

    table->setModel(&model);
    table->show();

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(table);
    setLayout(layout);
}

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Please be forgiving with your words as im really new thanks

[spirit]

you creates QStandardItemModel model(5, 2); in a stack (an object will be destroyed when out of scope). you should create in the heap, i.e. QStandardItemModel *model = new QStandardItemModel(5, 2);.

[junxuan]

ahh ty, cause the book used it in the main function. Thanks for your expertise

[junxuan]

After successfully implementing the QTableView, how do i make it stretch fully? As there are gaps on the right and bottom.

[junxuan]

im not sure if im allowed to do this, bumps.

[numbat]

Try:

table->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

table->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

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[junxuan]

Thanks for the help but it doesnt seem to be working.

edit: it seems that it isnt the QTableView that is not expanding, rather it is the model that it is displaying that doesnt expand.

[ChrisW67]

You don't need line 23 in your original post.

Maybe:

table->horizontalHeader()->setStretchLastSection(true);
OR
table->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);

table->horizontalHeader()->setStretchLastSection(true);
OR
table->horizontalHeader()->setResizeMode(0, QHeaderView::Stretch);

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