Display window full screen on secondary monitor using Qt

Question

Seems to be possible with native controls (see here and here) so now I'm looking for some Qt code to do it.

score 20 · Answer 1 · answered Jun 02 '15 at 13:24

One way of doing it in Qt5 is to use QWindow::setScreen to set the screen on which the window should be shown. QWidget has a windowHandle() that returns the pointer to the QWindow.

Here is how to show your widget on second screen in full-screen mode :

QWidget * widget = new QWidget();
widget->show();
widget->windowHandle()->setScreen(qApp->screens()[1]);
widget->showFullScreen();

score 19 · Accepted Answer · answered Jul 08 '10 at 13:04

19

I use this code for the second display in full screen successfully on both Windows & Linux

QRect screenres = QApplication::desktop()->screenGeometry(1/*screenNumber*/);
SecondDisplay secondDisplay = new SecondDisplay(); // Use your QWidget
secondDisplay->move(QPoint(screenres.x(), screenres.y()));
secondDisplay->resize(screenres.width(), screenres.height());
secondDisplay->showFullScreen();

answered Jul 08 '10 at 13:04

mmonem

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1

This doesn't work longer in Qt5. QWidget is shown on the first screen. – fdermishin Mar 11 '13 at 21:37
2

Confirmed not working on Qt5. Moving window after setting fullscreen appears to work. – eozgonul Jan 10 '14 at 09:04
I think problem with this code is that screen sizes may vary so just dividing full resolution with screencount is a gamble that may work depending on your screen resolutions. – Mr. Developerdude Feb 23 '15 at 22:29

score 6 · Answer 3 · answered May 31 '13 at 10:37

6

My take on this:

  auto const desktop(QApplication::desktop());

  setGeometry(desktop->screenGeometry(1));

#ifndef Q_OS_WIN
  setWindowState(Qt::WindowState(Qt::WindowFullScreen | windowState()));
#endif // Q_OS_WIN

answered May 31 '13 at 10:37

user1095108

14,119
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score 5 · Answer 4 · answered May 24 '13 at 02:00

5

showFullScreen first, then setGeometry.

Qt5 tested OK

answered May 24 '13 at 02:00

user2253705

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Would you mind including a code sample? It would make your answer more valuable. – Simon MᶜKenzie May 24 '13 at 02:18
This actually does not work, WindowState is reverted to NoState when you call setGeometry. – eozgonul Jan 10 '14 at 11:37

score -1 · Answer 5 · answered Feb 17 '17 at 08:51

-1

This problem got solved while using window->showFullScreen() instead of window->show().

answered Feb 17 '17 at 08:51

Debangana

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Display window full screen on secondary monitor using Qt

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