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Thread: to use drag & drop on QListWidget

  1. #1
    Join Date
    Apr 2010
    Location
    Italia
    Posts
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    Qt products
    Qt4
    Platforms
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    Default to use drag & drop on QListWidget

    Hello everyone,
    I'm using Qt 4.8.3 and Qt Creator 2.5.2 (maybe there is a bug because I do not compile in the resource file *. QRC, I have to do it manually from the command line dos) in Windows XP.
    I created a class ListaElementi by subclassing QListWidget in which the figures are listed in svg format. An example to understand is the following code:
    Qt Code:
    1. item = new QListWidgetItem(QIcon("ostacolo.svg"), "Ostacolo tipo 1", this);
    2. insertItem(1, item);
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    So far so good, I show you a list of figures. The project continues dragging and dropping onto my scene class (derived from QScene) one of the figures taken from ListaElementi. Even so good.
    My problem is to make sure that when I select the figure from ListaElementi and drag near to the mouse cursor would like to see the figure selected in such a way so that I can see her standing before release (drop) on the scene.
    Can you tell me how to write the code?
    To simplify things I reproduce below part of the code of the drag ListaElementi:
    Qt Code:
    1. void ListaElementi::mousePressEvent(QMouseEvent *event)
    2. {
    3. // si evidenzia l'elemento selezionato
    4. QListWidget::mousePressEvent(event);
    5.  
    6. //qDebug() << "ListaElementi::mousePressEvent";
    7.  
    8. // creo uno stream di dato contenente il nome del
    9. // item selezionato per usarlo nel drag&drop
    10. if(currentItem())
    11. {
    12. QByteArray dato;
    13. QDataStream stream(&dato, QIODevice::WriteOnly);
    14. stream << currentItem()->text();
    15. QMimeData *mime = new QMimeData;
    16. mime->setData("elementoListaSelez", dato);
    17.  
    18. QDrag *trascina = new QDrag(this);
    19. trascina->setMimeData(mime);
    20. trascina->setObjectName(currentItem()->text());
    21. trascina->setHotSpot(event->pos());
    22. trascina->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
    23. }
    24. }
    25.  
    26. void ListaElementi::dragEnterEvent(QDragEnterEvent *event)
    27. {
    28. //qDebug() << "ListaElementi::dragEnterEvent";
    29. QListWidget::dragEnterEvent(event);
    30.  
    31. // controlla che il dato da passare è un "elementoListaSelez"
    32. if(event->mimeData()->hasFormat("elementoListaSelez"))
    33. {
    34. // il dato non è preso dalla ListaElementi
    35. event->acceptProposedAction();
    36. }
    37. else
    38. {
    39. // l'elemnto non è del tipo "elementoListaSelez"
    40. event->ignore();
    41. }
    42. }
    43.  
    44. void ListaElementi::dragMoveEvent(QDragMoveEvent *e)
    45. {
    46. //qDebug() << "ListaElementi::dragMoveEvent";
    47. QListWidget::dragMoveEvent(e);
    48.  
    49. // controlla che il dato da passare è un "elementoListaSelez"
    50. if(e->mimeData()->hasFormat("elementoListaSelez"))
    51. {
    52. // il dato non è preso dalla ListaElementi
    53. e->acceptProposedAction();
    54. }
    55. else
    56. {
    57. // l'elemnto non è del tipo "elementoListaSelez"
    58. e->ignore();
    59. }
    60. }
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  2. #2
    Join Date
    Apr 2010
    Location
    Italia
    Posts
    106
    Thanked 1 Time in 1 Post
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    Thumbs up [RESOLVED] Re: to use drag & drop on QListWidget

    Ok all resolved, to see Qt italia forum: http://www.qt-italia.org/forum/viewtopic.php?f=6&t=829

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