Method handleDragMove

app/src/UI/WindowManager.cpp:1740–1786

* @brief Applies a drag delta to the focused window and updates snap indicators. */

 * @brief Applies a drag delta to the focused window and updates snap indicators.
 */
void UI::WindowManager::handleDragMove(QMouseEvent* event, const QPoint& delta)
{
  int newX          = m_initialGeometry.x() + delta.x();
  int newY          = m_initialGeometry.y() + delta.y();
  int w             = static_cast<int>(m_dragWindow->width());
  int h             = static_cast<int>(m_dragWindow->height());
  const int canvasW = static_cast<int>(width());
  const int canvasH = static_cast<int>(height());

  if ((w >= canvasW - 20 || h >= canvasH - 20) && !autoLayoutEnabled()) {
    w = static_cast<int>(m_dragWindow->implicitWidth());
    h = static_cast<int>(m_dragWindow->implicitHeight());
    m_dragWindow->setWidth(w);
    m_dragWindow->setHeight(h);
  }

  newX = qBound(0, newX, canvasW - w);
  newY = qBound(0, newY, canvasH - h);
  m_dragWindow->setX(newX);
  m_dragWindow->setY(newY);

  if (!autoLayoutEnabled()) {
    updateManualSnapIndicator(newX, newY, w, h, canvasW, canvasH);
    event->accept();
    return;
  }

  const QRect dragRect(newX, newY, w, h);
  m_targetWindow = findOverlapTarget(dragRect);

  if (m_targetWindow && m_targetWindow != m_dragWindow) {
    m_dragWindow->setWidth(qMin(w, static_cast<int>(m_targetWindow->width())));
    m_dragWindow->setHeight(qMin(h, static_cast<int>(m_targetWindow->height())));
    m_snapIndicator        = liftSnapBottom(extractGeometry(m_targetWindow), canvasH);
    m_snapIndicatorVisible = true;
    Q_EMIT snapIndicatorChanged();
    event->accept();
    return;
  }

  if (m_snapIndicatorVisible) {
    m_snapIndicatorVisible = false;
    Q_EMIT snapIndicatorChanged();
  }

  event->accept();
}

/**
 * @brief Computes the new geometry for the active resize window from the mouse delta.