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Thread: DropIndicator is empty when moving an item from QTreeWidget to QTableWidget

  1. #1
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    Question DropIndicator is empty when moving an item from QTreeWidget to QTableWidget

    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
    Qt Code:
    1. class TableWidget : public QTableWidget
    2. {
    3. Q_OBJECT
    4. public:
    5. TableWidget( QWidget *parent = 0 );
    6. protected:
    7. void dropEvent( QDropEvent *event );
    8. void dragEnterEvent( QDragEnterEvent *event );
    9. void dragMoveEvent( QDragMoveEvent* event );
    10. private:
    11. TableWidget *tableWidget;
    12. };
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    tablewidget.cpp
    Qt Code:
    1. #include "tablewidget.h"
    2.  
    3. TableWidget::TableWidget( QWidget *parent )
    4. : QTableWidget( parent )
    5. {
    6. setAcceptDrops( true );
    7. }
    8.  
    9. void TableWidget::dropEvent( QDropEvent *event )
    10. {
    11. itemAt( event->pos() )->setText( event->mimeData()->text() );
    12. event->acceptProposedAction();
    13. }
    14.  
    15. void TableWidget::dragEnterEvent( QDragEnterEvent *event )
    16. {
    17. event->acceptProposedAction();
    18. }
    19.  
    20. void TableWidget::dragMoveEvent( QDragMoveEvent* event )
    21. {
    22. event->accept();
    23. }
    To copy to clipboard, switch view to plain text mode 

    treewidget.h
    Qt Code:
    1. class TreeWidget : public QTreeWidget
    2. {
    3. Q_OBJECT
    4.  
    5. public:
    6. TreeWidget( QWidget *parent = 0 );
    7. protected:
    8. void mouseMoveEvent( QMouseEvent *event );
    9. private:
    10. TreeWidget *treeWidget;
    11. };
    To copy to clipboard, switch view to plain text mode 

    treewidget.cpp

    Qt Code:
    1. TreeWidget::TreeWidget( QWidget *parent )
    2. : QTreeWidget( parent )
    3. {
    4. setDragEnabled( true );
    5. }
    6.  
    7. void TreeWidget::mouseMoveEvent( QMouseEvent *event )
    8. {
    9. if ( ! ( event->buttons() & Qt::LeftButton ) )
    10. return;
    11.  
    12. if ( currentItem() == NULL )
    13. return;
    14.  
    15. QDrag *drag = new QDrag( this );
    16. QMimeData *mimeData = new QMimeData;
    17.  
    18. mimeData->setText( currentItem()->text( 0 ) );
    19. drag->setMimeData( mimeData );
    20.  
    21. drag->start( Qt::CopyAction | Qt::MoveAction );
    22. }
    To copy to clipboard, switch view to plain text mode 

    Any idea what's missing?
    Last edited by gboelter; 8th October 2010 at 08:35. Reason: spelling corrections

  2. #2
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    Default Re: DropIndicator is empty when moving an item from QTreeWidget to QTableWidget

    Found an old thread about the same problem:

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

    Unfortunately it ends without a solution ...

  3. #3
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    Unhappy Re: DropIndicator is empty when moving an item from QTreeWidget to QTableWidget

    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 ...

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