CODEWITHSUNDEEP
c++qtqtablewidget
OMG_Soruce
OMG_Soruce

Reputation: 106

how to remove Item in Qtablewidget?

My source code ↓

ui->tableWidget->setItem(0,7,new QTableWidgetItem(QString::number(3)));
ui->tableWidget->item(0,7)->setTextAlignment(Qt::AlignCenter);

My approach :

delete ui->tableWidget->item(0,7);

If this memory is free?

If not, let me know any other method.

Upvotes: 1

Views: 6167

Answers (1)

Martin Hennings
Martin Hennings

Reputation: 16866

The call to setItem(...) passes ownership of the QTableWidgetItem to the QTableWidget.

Although QTableWidgetItem is not a QObject, it does take care to inform the QTableWidget about its deletion (from qtablewidget.cpp, Qt 5.1.1):

QTableWidgetItem::~QTableWidgetItem()
{
    if (QTableModel *model = (view ? qobject_cast<QTableModel*>(view->model()) : 0))
        model->removeItem(this);
    view = 0;
    delete d;
}

takeItem() sets the view of the item to null, releasing the ownership to the caller. Because of this, the above code in the item's destructor model->removeItem(this); will not be called.

This means that you need to manually delete the QTableWidgetItem.
But it doesn't matter if you call takeItem(...) or not before deleting the item.

See also Remove QListWidgetItem: QListWidget::takeItem(item) vs delete item.

Upvotes: 4

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