#include <QApplication>
#include <QDropEvent>
#include <QListWidget>
#include <QMainWindow>
#include <QMimeData>

class MyListWidget : public QListWidget {
public:
  MyListWidget(QWidget *parent = nullptr) : QListWidget(parent) {
    setDragEnabled(true);
    setAcceptDrops(true);
    setDragDropMode(QAbstractItemView::DragDrop);
    setDefaultDropAction(Qt::MoveAction);
    setDropIndicatorShown(false);
  }

protected:
  void dropEvent(QDropEvent *event) override {
    if (event->source() == this && event->proposedAction() == Qt::CopyAction) {
      auto row = indexAt(event->position().toPoint()).row();
      if (row == -1) {
        row = model()->rowCount();
      }
      model()->insertRow(row, {});
      model()->setData(model()->index(row, 0), "--- BEGIN COPY ---");
      model()->dropMimeData(event->mimeData(), Qt::CopyAction, row + 1, 0, {});
      model()->insertRow(row + 2, {});
      model()->setData(model()->index(row + 2, 0), "--- END COPY ---");
      event->acceptProposedAction();
    }
    // else {
    QListWidget::dropEvent(event);
    // }
  }
};

class MainWindow : public QMainWindow {
  Q_OBJECT

public:
  MainWindow(QWidget *parent = nullptr) : QMainWindow(parent) {
    mListWidget = new MyListWidget(this);
    for (int i = 0; i < 3; ++i) {
      mListWidget->addItem("Item_" + QString::number(i));
    }
    setCentralWidget(mListWidget);
  }

private:
  MyListWidget *mListWidget;
};

int main(int argc, char *argv[]) {
  QApplication a(argc, argv);
  MainWindow w;
  w.show();
  return a.exec();
}

#include "main.moc"