QT 文件拖放事件dropEvent和dragEnterEvent

重载以下两个函数，可以实现将文本文件拖放进文本编辑器

void MainWindow::dragEnterEvent(QDragEnterEvent *event)//拖进事件

{

    if(event->mimeData()->hasFormat("text/uri-list"))

        event->acceptProposedAction();

}

void MainWindow::dropEvent(QDropEvent *event)//放下事件

{

    QList<QUrl> urls = event->mimeData()->urls();

    if (urls.isEmpty())

    {

        return;

    }

    foreach(QUrl url,urls)

    {

       QString fileName = url.toLocalFile();

//    QString fileName = urls.first().toLocalFile();

        if (fileName.isEmpty())

        {

            return;

        }

        QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();

        bool hasOpened = false;//是否已经打开该文件

        foreach (QMdiSubWindow *window, mdiArea->subWindowList())

        {

            MyTextEdit *subChild = qobject_cast<MyTextEdit *>(window->widget());

            if( subChild->curFilePath == canonicalFilePath)

            {

                hasOpened = true;

                mdiArea->setActiveSubWindow(window);

                continue;

            }

        }

        if(!hasOpened)

        {

            MyTextEdit *m_textEdit = new MyTextEdit;

            connect(m_textEdit,SIGNAL(isClose()),this,SLOT(updateStatue()));

            mdiArea->addSubWindow(m_textEdit);

            if(m_textEdit->do_file_Load(fileName))

            {

               m_textEdit->setVisible(true);

               second_statusLabel->setText(tr("打开成功"));

            }

            else

                m_textEdit->close();

            QSettings settings("QT","AnTextEdit");

            //当我们创建一个Qsettings的对象时，我们需要传递给它两个参数，

            //第一个是你公司或者组织的名称，第二个事你的应用程序的名称

            QStringList files = settings.value("recentFiles").toStringList();

            files.removeAll(fileName);

            files.prepend(fileName);//在最前端插入

            while(files.size() > MaxRecentFiles)

                files.removeLast();

            settings.setValue("recentFiles",files);

            updateRecentFiles();

            iniConnect();//初始化关联

        }

    }

}

http://blog.csdn.net/liuguangzhou123/article/details/7362083