QLayout: Attempting to add QLayout "" to MainWindow "", which already has a layout [SOLVED]

Robey Mardon

I'm trying to insert a layout and I got this:

QLayout: Attempting to add QLayout "" to MainWindow "", which already has a layout

#include "mainwindow.hpp"

#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QLineEdit>
#include <QPushButton>
#include <QProgressBar>

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
    auto layout  = new QVBoxLayout(this);
    auto vlayout = new QVBoxLayout();
    auto hlayout = new QHBoxLayout();

    auto edit = new QLineEdit(this);
    auto push = new QPushButton(this);
    push->setText("Go!");

    hlayout->addWidget(edit);
    hlayout->addWidget(push);

    vlayout->addLayout(hlayout);

    auto progress = new QProgressBar(this);

    vlayout->addWidget(progress);

    layout->addLayout(vlayout);

    setTabOrder(edit, push);
}

SGaist

Hi,

You can't, QMainWindow already has a special layout that handles everything in it (docks, menus, toolbars etc.) You have to put your layout on a widget that you will set on your QMainWindow through setCentralWidget

Robey Mardon

@SGaist I added this after the setTabOrder, is it right? - and worked!

    auto central = new QWidget;
    central->setLayout(layout);

    setCentralWidget(central);

SGaist

Yes, it is right indeed