QTableView vertical header resize

imre.horvath

Hi!

I try to resize the verticalheader of a qtableview with setFixedWidth(w) in runtime.
It works fine, but the grid not aligned after the resizing. I mean, when I increase the width of the header, it covers the left part of the first column. I think I need to repaint the tableview, but I don't know how.

Here is my code:

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

    QStringListModel *m = new QStringListModel(this);
    ui->tableView->setModel(m);
    m->setStringList({"a", "b"});
    // here it works
    ui->tableView->verticalHeader()->setFixedWidth(20);

    connect(ui->pushButton, &QPushButton::clicked, this, &MainWindow::on1);
    connect(ui->pushButton_2, &QPushButton::clicked, this, &MainWindow::on2);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on1()
{
    // here not
    ui->tableView->verticalHeader()->setFixedWidth(50);
}

void MainWindow::on2()
{
    // here not
    ui->tableView->verticalHeader()->setFixedWidth(10);
}

initial state:
https://mega.nz/#!Dk0gxIDK!0F8E8PzO-r7MKqi2MlVgznIa7akwfqw-kysPsxFGYNU

after on1:
https://mega.nz/#!yk9DUTBC!ikm3cxMNNlYjsCq_AXf0uI44jfZVLHGw8F6ccbFQ-3Y

after on2:
https://mega.nz/#!mxEEWYTL!5PjGLSph3LGgas0ezSUimNgAhsQ4aipDjKWqR96_Rgg

Thanks in advance:
Imre Horvath

Taz742

@imre.horvath
ui->tableView->setFixedWidth(50); is not a same ui->tableView->verticalHeader()->setFixedWidth(50); ?

imre.horvath

@Taz742 No, i want to resize only the vertical header, not the whole tableview. The tableview size remains the same.

Imre

Taz742

@imre.horvath
You are right sorry. on1 and on2 slot is called when enter a button?

imre.horvath

@Taz742 Yes, they are. I attached some screenshots

Imre

Diracsbracket

@imre.horvath
This seems to be a known issue with QTableView

A simple workaround from https://forum.qt.io/topic/8370/solved-resizing-vertical-header
is as follows:

    ui->tableView->verticalHeader()->setFixedWidth(50);

    int colw=ui->tableView->columnWidth(0);
    ui->tableView->setColumnWidth(0,colw-1);
    ui->tableView->setColumnWidth(0,colw);

In the post above, there is a more elegant method involving the use of QMetaObject::invokeMethod() which is the only way to invoke the protected method
updateGeometries() which is apparently needed.

imre.horvath

@Diracsbracket said in QTableView vertical header resize:

int colw=ui->tableView->columnWidth(0);
ui->tableView->setColumnWidth(0,colw-1);
ui->tableView->setColumnWidth(0,colw);

Thank you, it works.

Imre