需求:QTreeWidget响应拖放事件,把节点拖放到其它画布上。
实现:从QTreeWidget派生出子类,实现拖放相关的的虚函数
class QTreeWidgetDrag : public QTreeWidget
{
public:
QTreeWidgetDrag();
protected:
void dragEnterEvent(QDragEnterEvent *event) override;
void dragMoveEvent(QDragMoveEvent *event) override;
void dropEvent(QDropEvent *event) override;
void mousePressEvent(QMouseEvent *event) override;
};
在鼠标按下的函数中,后去点击的item:
void QTreeWidgetDrag::mousePressEvent(QMouseEvent *event)
{
*QTreeWidgetItem pCurrentItem = this->itemAt(event->pos());
//获取节点名称
QString strText = pCurrentItem->text(0);
QByteArray byte = strText.toUtf8();
QByteArray itemData;
QDataStream dataStream(&itemData, QIODevice::WriteOnly);