QTabWidget:: How to remove the blank area of QTabWidget

PengPeng

TabBar is hidden in the custom TabWidget, and then there are some margins that I cannot hide
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Try setContentsMargins(0, 0, 0, 0) Does not work

Example:


#include <QApplication>
#include <QMainWindow>
#include <QWidget>
#include <QHBoxLayout>
#include <QTabBar>
#include <QTabWidget>


int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    QMainWindow mainWindow;
    mainWindow.resize(900, 900);

    QWidget *contentWidget = new QWidget(&mainWindow);
    QTabWidget *tabWidget = new QTabWidget(contentWidget);

    QWidget *myWidget = new QWidget;

    QPalette palette = myWidget->palette();
    myWidget->setAutoFillBackground(true);
    palette.setColor(QPalette::Window, QColor(255, 0, 255));
    myWidget->setPalette(palette);
    tabWidget->addTab(myWidget, "test");
    tabWidget->setTabPosition(QTabWidget::West);
    tabWidget->setContentsMargins(0, 0, 0, 0);

    tabWidget->tabBar()->setExpanding(false);
    tabWidget->tabBar()->hide();

    QHBoxLayout layout;
    layout.setMargin(0);
    layout.setSpacing(0);
    layout.setContentsMargins(0, 0, 0, 0);
    layout.addWidget(tabWidget, 1);

    contentWidget->setLayout(&layout);
    contentWidget->show();

    mainWindow.setCentralWidget(contentWidget);
    mainWindow.show();

    return app.exec();
}

I searched for answers in many places, but I did not find the desired result.

jsulm

@PengPeng said in QTabWidget:: How to remove the blank area of QTabWidget:

tabWidget

I think you need to set content margins on mainWindow.layout()

PengPeng

@jsulm
Try

mainWindow.layout()->setMargin(0);
mainWindow.layout()->setSpacing(0);
mainWindow.layout()->setContentsMargins(0, 0, 0, 0);

This doesn't seem to work

mrjj

Hi
I think it comes from the tabWidget itself.
alt text

mrjj

Hi
Try with
tabWidget->setStyleSheet( "QTabWidget::pane { border: 0px;}" );
for me on windows that makes it go to border.

before
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after
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PengPeng

@mrjj This works for me, awesome 👍