Qt主窗口实现拖拽文件，显示到文本框

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setAcceptDrops(true);//设置接受拖拽
}

重写

void dragEnterEvent(QDragEnterEvent* event);//拖动进入事件
void dropEvent(QDropEvent* event);//放下事件

 

void MainWindow::dragEnterEvent(QDragEnterEvent* event)
{
    if(event->mimeData()->hasUrls())
    {
        event->acceptProposedAction();
    }
    else
    {
        event->ignore();
    }
}

void MainWindow::dropEvent(QDropEvent* event)
{
    const QMimeData* mimeData = event->mimeData();
    if(mimeData->hasUrls())
    {
        QList<QUrl>urlList = mimeData->urls();
        QString fileName = urlList.at(0).toLocalFile();
        if(!fileName.isEmpty())
        {
            QFile file(fileName);
            if(!file.open(QIODevice::ReadOnly))return;
            QTextStream in(&file);
            ui->textEdit->setText(in.readAll());
        }
    }
}