Qt widget displayed over other widgets

Question

I have some information/notification widget that should be displayed when some even occurs. My idea was to have a widget that is hidden in top left corner and would be shown when needed. Problem is that if I just put there simple widget and show it, everything will be moved to the right, what I want is to show that widget on top anything that's in that area (it will hide what's there, but that's ok). I can't use stacked widget, because information widget is in different dimensions then other widgets there. And if I just create floating widget and move it to that area it wont move if main window is moved. Is there any way how to do that?

Answer 1

Just create and place the widget on the fly. Avoid using UI to place the widget because then the widget position is managed by the layouts.

EDIT: Remember to create the widget after of the dialog's initialization. If you don't take care about this your widget will be inserted at the bottom.

class Dialog : public QDialog
{
    Q_OBJECT

    std::unique_ptr<Ui::Dialog> _ui;
    QWidget* _widgetOnTheTop;

  public:
    Dialog(QWidget* parent)
      : QDialog(parent), _ui(new Ui::Dialog)
    {
      _ui->setupUi(this);

      _widgetOnTheTop = new QPushButton(this);
      _widgetOnTheTop->setGeometry(10,10,100,35);
      _widgetOnTheTop->show();
    }
};