Method mouseMoveEvent

src/gui/ClientChainWidget.cpp:536–580

}

void ClientChainWidget::mouseMoveEvent(QMouseEvent* ev)
{
    if (m_pressIndex < 0 || !(ev->buttons() & Qt::LeftButton)) {
        // Hover → update cursor over interactive boxes.
        const int idx = hitTest(ev->position());
        setCursor((idx > 0 && !m_boxes[idx].isEndpoint)
                      ? Qt::PointingHandCursor : Qt::ArrowCursor);
        QWidget::mouseMoveEvent(ev);
        return;
    }
    // Distinguish drag from click — require ~6 px of movement.
    if ((ev->position().toPoint() - m_pressPos).manhattanLength() < 6) return;

    const auto& b = m_boxes[m_pressIndex];
    auto* drag = new QDrag(this);
    auto* mime = new QMimeData;
    mime->setData(kMimeFormat,
                  QByteArray::number(static_cast<int>(b.stage)));
    drag->setMimeData(mime);

    // Drag pixmap — snapshot the box so the user sees what they're moving.
    QPixmap pix(b.rect.size().toSize());
    pix.fill(Qt::transparent);
    {
        QPainter pp(&pix);
        pp.setRenderHint(QPainter::Antialiasing, true);
        pp.setBrush(kBgActive());
        pp.setPen(QPen(kBorderActive(), 1.0));
        pp.drawRoundedRect(QRectF(0, 0, pix.width() - 1, pix.height() - 1),
                           kRadius, kRadius);
        QFont f = pp.font();
        f.setPixelSize(9);
        f.setBold(true);
        pp.setFont(f);
        pp.setPen(kTextLabel());
        pp.drawText(pix.rect(), Qt::AlignCenter, stageLabel(b.stage));
    }
    drag->setPixmap(pix);
    drag->setHotSpot(QPoint(pix.width() / 2, pix.height() / 2));

    m_pressIndex = -1;
    drag->exec(Qt::MoveAction);
    m_dropIndex = -1;
    update();
}

void ClientChainWidget::mouseReleaseEvent(QMouseEvent* ev)
{