Method setupContentContainer

app/src/Platform/CSD.cpp:1157–1202

* @brief Creates the opaque content-background container holding the reparented QML content. */

 * @brief Creates the opaque content-background container holding the reparented QML content.
 */
void Window::setupContentContainer()
{
  auto* quickWindow = qobject_cast<QQuickWindow*>(m_window.data());
  if (!quickWindow)
    return;

  QQuickItem* root   = quickWindow->contentItem();
  QQmlEngine* engine = qmlEngine(quickWindow);
  if (!engine)
    return;

  static const char* qmlCode = R"(
    import QtQuick

    Rectangle {
      id: contentContainer
      color: "transparent"
    }
  )";

  QQmlComponent component(engine);
  component.setData(qmlCode, QUrl());

  if (component.isError()) {
    for (const auto& error : component.errors())
      qWarning() << "CSD QML error:" << error.toString();

    return;
  }

  m_contentContainer = qobject_cast<QQuickItem*>(component.create());
  if (!m_contentContainer)
    return;

  m_contentContainer->setParentItem(root);
  m_contentContainer->setZ(0);

  connect(quickWindow, &QQuickWindow::widthChanged, this, &Window::updateContentContainerGeometry);
  connect(quickWindow, &QQuickWindow::heightChanged, this, &Window::updateContentContainerGeometry);

  updateContentContainerGeometry();

  const auto children = root->childItems();
  for (QQuickItem* child : children)
    reparentChildToContainer(child);
}

/**
 * @brief Updates the title bar position and size.