DropIndicator is empty when moving an item from QTreeWidget to QTableWidget

[gboelter]

Good am!

I have just startet to deal with DnD and I got it working already.

But there is one problem left: The DropIndicator is empty! Means, there is the '+'-sign and a small empty square only while copying an item.

I guess, it's not not a big thing but I was not able to find it out by myself.

Here is some code:

tablewidget.h

class TableWidget : public QTableWidget
{
    Q_OBJECT
public:
    TableWidget( QWidget *parent = 0 );
protected:
    void dropEvent( QDropEvent *event );
    void dragEnterEvent( QDragEnterEvent *event );
    void dragMoveEvent( QDragMoveEvent* event );
private:
    TableWidget *tableWidget;
};

class TableWidget : public QTableWidget
{
    Q_OBJECT
public:
    TableWidget( QWidget *parent = 0 );
protected:
    void dropEvent( QDropEvent *event );
    void dragEnterEvent( QDragEnterEvent *event );
    void dragMoveEvent( QDragMoveEvent* event );
private:
    TableWidget *tableWidget;
};

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tablewidget.cpp

#include "tablewidget.h"
 
TableWidget::TableWidget( QWidget *parent )
    : QTableWidget( parent )
{
    setAcceptDrops( true );
}
 
void TableWidget::dropEvent( QDropEvent *event )
{
    itemAt( event->pos() )->setText( event->mimeData()->text() );
    event->acceptProposedAction();
}
 
void TableWidget::dragEnterEvent( QDragEnterEvent *event )
{
    event->acceptProposedAction();
}
 
void TableWidget::dragMoveEvent( QDragMoveEvent* event )
{
    event->accept();
}

#include "tablewidget.h"

TableWidget::TableWidget( QWidget *parent )
    : QTableWidget( parent )
{
    setAcceptDrops( true );
}

void TableWidget::dropEvent( QDropEvent *event )
{
    itemAt( event->pos() )->setText( event->mimeData()->text() );
    event->acceptProposedAction();
}

void TableWidget::dragEnterEvent( QDragEnterEvent *event )
{
    event->acceptProposedAction();
}

void TableWidget::dragMoveEvent( QDragMoveEvent* event )
{
    event->accept();
}

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treewidget.h

class TreeWidget : public QTreeWidget
{
    Q_OBJECT
 
public:
    TreeWidget( QWidget *parent = 0 );
protected:
    void mouseMoveEvent( QMouseEvent *event );
private:
    TreeWidget *treeWidget;
};

class TreeWidget : public QTreeWidget
{
    Q_OBJECT

public:
    TreeWidget( QWidget *parent = 0 );
protected:
    void mouseMoveEvent( QMouseEvent *event );
private:
    TreeWidget *treeWidget;
};

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treewidget.cpp

TreeWidget::TreeWidget( QWidget *parent )
    : QTreeWidget( parent )
{
    setDragEnabled( true );
}
 
void TreeWidget::mouseMoveEvent( QMouseEvent *event )
{
    if ( ! ( event->buttons() & Qt::LeftButton ) )
        return;
 
    if ( currentItem() == NULL )
        return;
 
    QDrag *drag = new QDrag( this );
    QMimeData *mimeData = new QMimeData;
 
    mimeData->setText( currentItem()->text( 0 ) );
    drag->setMimeData( mimeData );
 
    drag->start( Qt::CopyAction | Qt::MoveAction );
}

TreeWidget::TreeWidget( QWidget *parent )
    : QTreeWidget( parent )
{
    setDragEnabled( true );
}

void TreeWidget::mouseMoveEvent( QMouseEvent *event )
{
    if ( ! ( event->buttons() & Qt::LeftButton ) )
        return;

    if ( currentItem() == NULL )
        return;

    QDrag *drag = new QDrag( this );
    QMimeData *mimeData = new QMimeData;

    mimeData->setText( currentItem()->text( 0 ) );
    drag->setMimeData( mimeData );

    drag->start( Qt::CopyAction | Qt::MoveAction );
}

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Any idea what's missing?

[gboelter]

Found an old thread about the same problem:

http://www.qtcentre.org/threads/1219...iew.-Need-help

Unfortunately it ends without a solution ...

[gboelter]

I have tried this sample now: http://sector.ynet.sk/qt4-tutorial/dnd.html

Same problem. The moment I'll subclass QTableWidget/QTreeWidget the drop-indicaor is empty.

I have tried it under Linux with Qt 4.6.3. and Qt 4.7.0, same problem ...