why is the background not showing when using qstackedlayout?

qtenjoyer

I’m writing my own messenger and I need to make 2 forms with an input and a main window. For this I decided to use qstackedlayout which will be linked to qwidget. All descendants of the form class (entrance or main window - no difference) are displayed normally, but the widget itself is not.

This is the window constructor code (which is from qwidget):

MainWindow::MainWindow(QWidget* parent) : QWidget(parent) {
    m_net = new NetworkController(this);
    m_mainScene = new MainScene(this, m_net);
    m_loginScene = new LoginScene(this, m_net);
    m_stackLayout = new QStackedLayout(this);
    connect(m_net, SIGNAL(succesfullLogin(QUuid)), this, SLOT(on_succesfullLogin(QUuid)));
    connect(m_net, SIGNAL(succesfullLogin(QUuid)), m_mainScene, SLOT(on_succesfullLogin(QUuid)));
    connect(m_net, SIGNAL(succesfullLogin(QUuid)), m_loginScene, SLOT(on_succesfullLogin(QUuid)));
    connect(m_net, SIGNAL(lostConnection()), this, SLOT(on_lostConnection()));
    m_stackLayout->addWidget(m_loginScene);
    m_stackLayout->addWidget(m_mainScene);
    m_stackLayout->setCurrentIndex(0);
}

When you run it you get the following:

But in qt designer it looks like this:

MainScene and LoginScene are just classes inherited from qwidget, in their constructor I just call setupUi(this) and that’s it

I can’t figure out what I’m doing wrong for a long time, I hope you can help

ChrisW67

@qtenjoyer Sorry, I cannot see an issue here. Your UI has a translucent box around the buttons, and that is visible in the composed UI. The background you placed it over is a matte dark grey, and the translucent box is slightly darker as you would expect.

What were you expecting?

qtenjoyer

@ChrisW67 said in why is the background not showing when using qstackedlayout?:

Sorry, I cannot seen an issue here. Your UI has a translucent box around the buttons, and that is visible in the composed UI. The background you placed it over is a matte dark grey, and the translucent box is slightly darker as you would expect.

What were you expecting?

but there is no yellow background that I need

ChrisW67

@qtenjoyer said in why is the background not showing when using qstackedlayout?:

but there is no yellow background that I need

How have you achieved that yellow background?

qtenjoyer

@ChrisW67 via stylesheet

Bonnie

@qtenjoyer It has nothing to do with QStackedLayout, the stylesheet doesn't work because you set it on a subclassed QWidget.
You may check the QWidget part of https://doc.qt.io/qt-6/stylesheet-reference.html.

qtenjoyer

@Bonnie that is, I cannot use stylesheet on classes inherited from qwidget? How can I realize what I want?

Pl45m4

@qtenjoyer said in why is the background not showing when using qstackedlayout?:

that is, I cannot use stylesheet on classes inherited from qwidget? How can I realize what I want?

Your question indicates that you haven't read @Bonnie 's post carefully :)
The answer is already there :))
(Follow that link. There's an example how you can do it)