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droparea.h Example File
draganddrop/dropsite/droparea.h

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 #ifndef DROPAREA_H
 #define DROPAREA_H

 #include <QLabel>

 class QMimeData;

 class DropArea : public QLabel
 {
     Q_OBJECT

 public:
     DropArea(QWidget *parent = 0);

 public slots:
     void clear();

 signals:
     void changed(const QMimeData *mimeData = 0);

 protected:
     void dragEnterEvent(QDragEnterEvent *event);
     void dragMoveEvent(QDragMoveEvent *event);
     void dragLeaveEvent(QDragLeaveEvent *event);
     void dropEvent(QDropEvent *event);

 private:
     QLabel *label;
 };

 #endif