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Hide and show again fullscreen window

  • What is the expected behavior of the window state when hiding fullscreen window: can flags Qt::WindowFullScreen and Qt::WindowMaximized be changed?

    Simple application with one button, that hides and shows fullscreen window and print FullScreen and Maximized flags:
    #include <QApplication>
    #include <QMainWindow>
    #include <QPushButton>
    #include <QWidget>
    #include <QDebug>
    #include <QHBoxLayout>

    class MainWindow : public QMainWindow
    explicit MainWindow(QWidget *parent = 0) : QMainWindow(parent) {
    QPushButton *btn = new QPushButton("hideshow");
    connect(btn, &QPushButton::clicked, = {
    qDebug() << isFullScreen() << isMaximized();
    virtual ~MainWindow() {}

    int main(int argc, char *argv[])
    QApplication app(argc, argv);
    MainWindow *w = new MainWindow();
    return app.exec();

    Expected output for me when I clicked the button twice is:
    true false
    true false
    but actual output is:
    true false
    false true
    i.e. flag WindowMaximized is dropped and window looks like maximized instead of fullscreen.

    Qt version is 5.3.1.

  • Moderators

    If you want it full screen, then use showFullScreen() instead of show() in your slot.

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