Drag & Drop is not activated in subclass of qdialog

[K.Sasikala]

cannn't activate the drag & drop event in a subclass of qdialog. please help me.

[Ashkan_s]

Have you used setAcceptDrops(true) to enable it? QWidget::setAcceptDrops()
Also you must re-implement dragEnterEvent() and accept the event. QWidget::dragEnterEvent()
Example:

dialog.h

#include <QDialog>
 
class dialog : public QDialog
{
    Q_OBJECT
public:
    explicit dialog(QWidget *parent = 0);
 
signals:
 
public slots:
 
protected:
    void dragEnterEvent(QDragEnterEvent *event);
 
};

#include <QDialog>

class dialog : public QDialog
{
    Q_OBJECT
public:
    explicit dialog(QWidget *parent = 0);

signals:

public slots:

protected:
    void dragEnterEvent(QDragEnterEvent *event);

};

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dialog.cpp

#include "dialog.h"
#include <QDragEnterEvent>
 
dialog::dialog(QWidget *parent) :
    QDialog(parent)
{
    setAcceptDrops(true);
}
 
void dialog::dragEnterEvent(QDragEnterEvent *event)
{
    event->accept();
}

#include "dialog.h"
#include <QDragEnterEvent>

dialog::dialog(QWidget *parent) :
    QDialog(parent)
{
    setAcceptDrops(true);
}

void dialog::dragEnterEvent(QDragEnterEvent *event)
{
    event->accept();
}

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main.cpp

#include <dialog.h>
#include <QtGui>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    dialog d;
 
    d.show();
    return app.exec();
}

#include <dialog.h>
#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    dialog d;

    d.show();
    return app.exec();
}

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To view other related methods you can refer to http://doc.qt.io/qt-4.8/dnd.html