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Drag and drop between QTableView and QGraphicsView (from model to model)

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  • B Offline
    B Offline
    broadpeak
    wrote on last edited by
    #1

    I have a QTableView (its model is QStandardItemModel) and I have a QGraphicsView (its model is a QGraphicsScene). I'd like to copy/move an item (an icon with text) from the table into the graphics area.

    How can I solve this?

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    • A Offline
      A Offline
      andre
      wrote on last edited by
      #2

      You will need to implement it yourself. There is no feature in Qt that does all this automatically, but it certainly can be done (from experience, I have done it).

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      • B Offline
        B Offline
        broadpeak
        wrote on last edited by
        #3

        Yes, I know that I have to implement it myself.
        But I have no idea, how can I solve it.
        My main problem is with the model...

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        • A Offline
          A Offline
          andre
          wrote on last edited by
          #4

          QGraphicsView forwards drag & drop events to the scene. "This section":/doc/qt-4.8/graphicsview.html#drag-and-drop in the documentation should get you started.

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          • B Offline
            B Offline
            broadpeak
            wrote on last edited by
            #5

            What I have done till now:

            drag side:
            I have a subclassed QTableView. I reimplemented the mouseMoveEvent function. Here I assembled the mimedata and started the drag.
            This event is running good when I drag a row from the table.

            drop side:
            This is a subclassed QGraphicsView, here I have some pixmap on the scene (and on the view). I reimplemented the dragEnterEvent what is running good.

            But:
            I reimplemented the dropEvent too, but this event doesn't run at all...

            @
            void DisplayLayout::dropEvent(QDropEvent* event)
            {
            qDebug() << "dropEvent" ;
            }
            @

            Why?

            (And what is the different between event->acceptProposedAction(); and event->setAccepted(true); ?)

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            • K Offline
              K Offline
              KA51O
              wrote on last edited by
              #6

              Another "helpful wiki entry":https://qt-project.org/doc/qt-4.8/model-view-programming.html#using-drag-and-drop-with-item-views on the subject.

              Make sure you have enabled drag & drop in both views, and that the mime data is accepted.

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              • B Offline
                B Offline
                broadpeak
                wrote on last edited by
                #7

                Thx the link, I've read this article.

                My mimedata seems to be good.
                I've set in the views the setDragEnabled(true) and setAcceptDrops(true);

                What I'd like to: select a row in the table (get the ID), and I pass this ID into the graphicsview, and added a pixmap with this ID.

                But I have no succes :(

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