Qt拖拽功能

窗口拖拽文件读取文件路径+文件名

void MainWindow::dragEnterEvent(QDragEnterEvent *ev)
{
    if(ev->mimeData()->hasUrls())
    {
        ev->accept();//接收拖动进入事件
    }
    //ev->ignore();//若忽略该事件，则不会发生之后的事件，拖放到此结束
}

void MainWindow::dropEvent(QDropEvent *ev)
{
    QList<QUrl> urls = ev->mimeData()->urls();
    ui->lineEdit_source->setText(urls[0].toLocalFile());
    ui->lineEdit_target->setText(urls[0].toLocalFile());
    //if(ev->mimeData()->hasUrls())
    //{
        //QList<QUrl> urls = ev->mimeData()->urls();
       // ui->lineEdit_source->text() = urls.at(0).toLocalFile();
       // ui->lineEdit_target->text() = urls.at(1).toLocalFile();
        //for(int i=0; i<urls.size(); i++)
        //{

        //}

    //}
}

调试过程信号槽函数

ui->label->setAcceptDrops(true);

拖拽到指定控件获得路径+文件名

https://www.pianshen.com/article/872738975/

bool eventFilter(QObject *watched, QEvent *event);

//drag file
    ui->pushButton->installEventFilter(this);
    ui->pushButton->setAcceptDrops(true);
    ui->pushButton_2->installEventFilter(this);
    ui->pushButton_2->setAcceptDrops(true);

bool MainWindow::eventFilter(QObject *watched, QEvent *event)
{
    if (watched == ui->pushButton)
    {
        if (event->type() == QEvent::DragEnter) {
            // [[2]]: 当拖放时鼠标进入label时, label接受拖放的动作
            QDragEnterEvent *dee = dynamic_cast<QDragEnterEvent *>(event);
            dee->acceptProposedAction();
            return true;

        } else if (event->type() == QEvent::Drop)
        {


            QDropEvent *de = dynamic_cast<QDropEvent *>(event);
            QList<QUrl> urls = de->mimeData()->urls();
            if (urls.isEmpty()) { return true; }
            ui->lineEdit_source->setText( urls.first().toLocalFile());;
        }

    } else if (watched == ui->pushButton_2)
    {
        if (event->type() == QEvent::DragEnter)
        {
            // [[2]]: 当拖放时鼠标进入label时, label接受拖放的动作
            QDragEnterEvent *dee = dynamic_cast<QDragEnterEvent *>(event);
            dee->acceptProposedAction();
            return true;

        } else if (event->type() == QEvent::Drop)
        {
            // [[3]]: 当放操作发生后, 取得拖放的数据
            QDropEvent *de = dynamic_cast<QDropEvent *>(event);
            QList<QUrl> urls = de->mimeData()->urls();
            if (urls.isEmpty()) { return true; }
            ui->lineEdit_target->setText( urls.first().toLocalFile());



        }

    }
            return QMainWindow::eventFilter(watched, event);
 }