QGroupBox dropEvent never called

[SebastianS]

Hey guys,

I try to drop a widget on a QGroupBox. For that purpose, I installed a event filter in the containing widget:

QGroupBox *gTemp = new QGroupBox("shift" + QString::number(i + 1), this);
        gTemp->setFlat(true);
        gTemp->setAcceptDrops(true);
        gTemp->installEventFilter(this);

The code of the event filter is as follows:

bool Fachbereich::eventFilter(QObject *object, QEvent *event)
{
    qDebug() << "Fachbereich::eventFilter(" << object << ", " << event << ")";

    if (event->type() == QEvent::Drop)
    {
        QGroupBox *gTemp = qobject_cast<QGroupBox*>(object);
        qDebug() << gTemp->title();
    }

    return QObject::eventFilter(object, event);
}

The QGroupBox's DragEnterEvent works, as the output of qDebug() shows:

Fachbereich::eventFilter( QGroupBox(0x3335a8e0) ,  QDragEnterEvent(dropAction=MoveAction, proposedAction=MoveAction, possibleActions=MoveAction, posF=7,53, answerRect=QRect(7,53 1x1), formats=("text/plain"), LeftButton )

The QDropEvent on the other hand is never called. Do you have any suggestions?

Thanks
Sebastian

[SebastianS]

Ok, solved the "problem". I just derived my own class of QGroupBox. Here is the code, just in case it can help somebody facing the same ideas.

dropablegroupbox.h

#ifndef DROPABLEGROUBOX_H
#define DROPABLEGROUBOX_H

#include <QGroupBox>

class DropableGrouBox : public QGroupBox
{
public:
    DropableGrouBox(const QString &title);

private:
    void dragEnterEvent(QDragEnterEvent *event);
    void dragMoveEvent(QDragMoveEvent *event);
    void dropEvent(QDropEvent *event);
};

#endif // DROPABLEGROUBOX_H

dropablegroupbox.cpp

#include "dropablegroubox.h"
#include <QDebug>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QMimeData>

DropableGrouBox::DropableGrouBox(const QString &title)
{
    QGroupBox::setTitle(title);
    setAcceptDrops(true);
}

void DropableGrouBox::dragEnterEvent(QDragEnterEvent *event)
{
    qDebug() << "DropableGrouBox::dragEnterEvent(" << event << ")";

    if (event->mimeData()->hasFormat("text/plain"))
    {
            event->acceptProposedAction();
    }
}

void DropableGrouBox::dragMoveEvent(QDragMoveEvent *event)
{
    qDebug() << "DropableGrouBox::dragMoveEvent(" << event << ")";

    if (event->mimeData()->hasFormat("text/plain"))
    {
            event->acceptProposedAction();
    }
}

void DropableGrouBox::dropEvent(QDropEvent *event)
{
    qDebug() << "DropableGrouBox::dropEvent(" << event << ")";

    QString ID = event->mimeData()->text();

    if (ID.toInt() != 0)
    {
        event->acceptProposedAction();
    }
}

In the code:

DropableGrouBox *gTemp = new DropableGrouBox("Schicht " + QString::number(i + 1));
        gTemp->setFlat(true);
        gTemp->setAcceptDrops(true);

Best regards
Sebastian
https://www.five-s.de