[Qt-interest] Change layout in subclass of standard widget ?

[Stephen Collyer]

I'm trying to derive from a QTableView, to create a custom widget
comprising the table view, and a couple of QPushButtons, like so:

class MDPTableView : public QTableView
{
    Q_OBJECT

    public:
        MDPTableView(QWidget* parent = 0);

    ..

    private:
        QPushButton* delete_;
        QPushButton* edit_;

};

In the ctor, I try to lay out the widgets like so:

MDPTableView::MDPTableView(QWidget* parent)
               : QTableView(parent)
{
    delete_ = new QPushButton(tr("Delete"), this);
    edit_   = new QPushButton(tr("Edit"), this);

    QHBoxLayout* button_layout = new QHBoxLayout;
    button_layout->addWidget(delete_);
    button_layout->addWidget(edit_);

    QVBoxLayout* main_layout = new QVBoxLayout;
    main_layout->addWidget(this);
    main_layout->addLayout(button_layout);

    setLayout(main_layout);
}

However, this doesn't work: the app's main window is never shown, and
the problem seems to be my attempt to add "this" to main_layout.

How does one go about changing the layout of a derived standard
widget in this case ? I'm doing something wrong, but can't see how
to fix it.

-- 
Stephen Collyer
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