[Qt] TabキーをkeyPressEventで受け取る方法

grab_tabkey.cpp

#include <QtWidgets/QWidget>
#include <QtWidgets/QApplication>
#include <QtWidgets/QHBoxLayout>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QPlainTextEdit>
#include <QtWidgets/QLineEdit>
#include <QtCore/QDebug>

class MyWidget : public QWidget {
    Q_OBJECT
public:
    MyWidget(QWidget *parent = nullptr) : QWidget(parent) {
        setFocusPolicy(Qt::WheelFocus);
    }

protected:
    void keyPressEvent(QKeyEvent *event) override {
        qDebug() << event->key();
    }
    bool focusNextPrevChild(bool /*next*/) override {
        return false;
    }
};

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QWidget w;
    auto h = new QHBoxLayout();
    auto v = new QVBoxLayout();
    auto target = new MyWidget();
    target->setMinimumSize(100, 100);
    h->addWidget(target);
    h->addLayout(v);
    v->addWidget(new QLineEdit());
    v->addWidget(new QTextEdit());
    v->addSpacerItem(new QSpacerItem(0, 100));
    w.setLayout(h);
    w.show();
    return a.exec();

}

#include "grab_tabkey.moc"