How to resize columns in QTreeWidget to the minimum space required

Question

I am a student programmer and I am using Qt to build a GUI interface for work. I have a QTreeWidget that has a total of 8 Columns. The input that needs to be en

Answer 1

This minimal example works for me:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QVBoxLayout *layout = new QVBoxLayout(centralWidget());
    QTreeWidget *tree = new QTreeWidget(this);
    layout->addWidget(tree);

    tree->setColumnCount(3);

    QStringList first, second, third;
    first  << "xxxxxxxxx"      << "xxxxxxxxxxxxx"     << "xxxxxxxx";
    second << "xxxxx"          << "xxxxxxxxxxxxxxxxx" << "xxxxx";
    third  << "xxxxxxxxxxxxxx" << "xxxxxxxxxx"        << "xxxxxxxx";

    tree->insertTopLevelItem(0, new QTreeWidgetItem(first));
    tree->insertTopLevelItem(0, new QTreeWidgetItem(second));
    tree->insertTopLevelItem(0, new QTreeWidgetItem(third));

    for(int i = 0; i < 3; i++)
        tree->resizeColumnToContents(i);
}

All you need to do is call the resizeColumnToContents() method once for every column after you populate the view. Let me know if the problem persists.