How to make all objects shrinkable in QStatusBar

[JackKuo]

As this GIF.

In my implementation, I use addPermanentWidget() to add some QLabel, but only can make the last QLable shrinkable when window size change.

[JoeCFD]

@JackKuo

class ResizableWidget : public QWidget {
public:
    ResizableWidget(QWidget *parent = nullptr) : QWidget(parent), resizing(false) {}

protected:
    void mousePressEvent(QMouseEvent *event) override {
        if (event->button() == Qt::LeftButton) {
            resizing = true;
            lastPos = event->globalPos();
        }
    }

    void mouseMoveEvent(QMouseEvent *event) override {
        if (resizing) {
            int deltaX = event->globalX() - lastPos.x();
            int deltaY = event->globalY() - lastPos.y();
            resize(width() + deltaX, height() + deltaY);
            lastPos = event->globalPos();
        }
    }

    void mouseReleaseEvent(QMouseEvent *event) override {
        Q_UNUSED(event);
        resizing = false;
    }

    void paintEvent(QPaintEvent *event) override {
        Q_UNUSED(event);
        QPainter painter(this);
        painter.fillRect(rect(), Qt::blue);
    }

private:
    bool resizing;
    QPoint lastPos;
};