QT5 custom widget with .ui file - calling Ui::myWidget.setupUi required when displaying it

Question

I created QT custom widget MyWidget with a .ui file. But when I place QWidget to MainWindow in QT designer and promote it to MyWidget, it just renders an empty widget.

I figured out why it doesn't work. In generated file ui_mainwindow.h in function setupUi is code for displaying my widget following:

widget = new MyWidget(centralWidget);
widget->setObjectName(QString::fromUtf8("widget"));
verticalLayout->addWidget(widget);

It works, when I call Ui::MyWidget.setupUi (replace the code above with following):

widget = new MyWidget(centralWidget);
Ui::MyWidget uiOfWidget;
uiOfWidget.setupUi(widget);
widget->setObjectName(QString::fromUtf8("widget"));
verticalLayout->addWidget(widget);

So my question is, how it's possible to reach one of following:

• Generate code like this automatically when compiling MainWindow.ui file
• Remove the need for calling Ui::MyWidget.setupUi
• Or other fix...?

I use QT5. Thank you!

Answer 1

As @drescherjm pointed out, the solution is to call Ui::MyWidget.setupUi in constructor of MyWidget:

MyWidget::MyWidget(QWidget* parent, Qt::WindowFlags f): QWidget(parent, f) {
    Ui::MyWidget ui;
    ui.setupUi(this);
}