Qwidget实现文本拖放

//.h文件
class MainWindow : public QMainWindow
 {
     Q_OBJECT

public:
     MainWindow(QWidget *parent = 0);
     ~MainWindow();

protected:
     void dragEnterEvent(QDragEnterEvent *event);
     void dropEvent(QDropEvent *event);

private:
     bool readFile(const QString &fileName);
     QTextEdit *textEdit;
 };
 //.cpp文件
MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
 {
     textEdit = new QTextEdit;
     setCentralWidget(textEdit);

    textEdit->setAcceptDrops(false);
     setAcceptDrops(true);

    setWindowTitle(tr("Text Editor"));
 }

MainWindow::~MainWindow()
 {
 }

void MainWindow::dragEnterEvent(QDragEnterEvent *event)
 {
     if (event->mimeData()->hasFormat("text/uri-list")) {
         event->acceptProposedAction();
     }
 }

void MainWindow::dropEvent(QDropEvent *event)
 {
     QList<QUrl> urls = event->mimeData()->urls();
     if (urls.isEmpty()) {
         return;
     }

    QString fileName = urls.first().toLocalFile();
     if (fileName.isEmpty()) {
         return;
     }

    if (readFile(fileName)) {
         setWindowTitle(tr("%1 - %2").arg(fileName, tr("Drag File")));
     }
 }

bool MainWindow::readFile(const QString &fileName)
 {
     bool r = false;
     QFile file(fileName);
     QTextStream in(&file);
     QString content;
     if(file.open(QIODevice::ReadOnly)) {
         in >> content;
         r = true;
     }
     textEdit->setText(content);
     return r;
 }
 //  
创建显示
  MainWindow *w=cqltbe_new(MainWindow);
     w->show();