Dynamic QWidget from QtDesigner form

Gourmet

What I am doing wrong? I need dynamic QWidget with form created in QtDesigner. It is heavily decorated dialog therefore I cannot use QMessageBox. All code works but widget does not appear visible. It appears invisible and blocks underlaying widgets (form is Application Modal).

void SomeClass::dialog(const QString& text)
{
    if( Dlg == Q_NULLPTR )
    {
        Dlg = new QWidget((QWidget*)parent()); //parent() here is QMainWindow's centralWidget
        ui->setupUi( Dlg ); // ui is common QtDesigner form, it's Ok
        Dlg->raise();
        Dlg->update();
        connect( ui->okButton, SIGNAL(pressed()), this, SLOT(dialogYes()) );
        connect( ui->noButton, SIGNAL(pressed()), this, SLOT(dialogNo()) );
    }
    ui->messageText->setText( text );
    Dlg->show();
}

I remember that I did this years ago - and all worked fine. But may be something changed in latest Qt versions (or I forget do something).

jsulm

@Gourmet Why don't you simply instantiate your form directly instead of creating a QWidget instance?

Gourmet

@jsulm instantinate directly? This is direct "instantination" as it is described in docs. And form appears - but invisible without clean reason. Of course it has windowOpacity = 1.0 in properties.

jsulm

@Gourmet What I mean is:

MyForm *myForm = new MyForm(parent());

MyForm being your form created in designer.

Gourmet

@jsulm but in designer I have created just only UI XML file. And automatically generated ui_form.h file containing form init code. It requires QWidget to be shown.

Can you tell why I do not see form with my code? If not - then show other solution completely, not only idea. I am straight on my code for while.

jsulm

@Gourmet I don't know why it is not visible. You could try the simple example from the doc with our ui to see whether it is visible:

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget widget;
    Ui::YOUR_UI_HERE ui;
    ui.setupUi(&widget);

    widget.show();
    return app.exec();
}

Also you wrote: "It is heavily decorated dialog". What do you mean with "decorated"? Style-sheets?

Gourmet

@jsulm yes, style-sheets. The form is clearly visible in designer.

The code you have shown is almost the same as mine. No significant difference.

Pl45m4

@Gourmet

What happens if you set your MainWindow as parent instead of the centralWidget? Or without any parent... Does it show up?

Gourmet

@Pl45m4 oops... parent() returns NULL. This is reason to investigate more...

Gourmet

The solution is:

Dlg = new QWidget(QApplication::activeWindow());