[Qt-interest] QTreeView Drag&Drop issue

[Sylvain Pointeau]

Hi David, Sean,
Thank you very much for your answers,

actually I just do drag & drop in the same treeview,
so I can copy or move an item,
but in any cases, I only have the (+) icon.

seems a bug for me, just wanted to ask you if it happens to you also, and if
you have any workaround.
it should be anyway a built-in functionality.

Cheers,
Sylvain

On Fri, Aug 14, 2009 at 7:20 PM, David Boosalis <david.boosalis at gmail.com>wrote:

> Sorry for not understanding,
>
> In mouseMoveEvent() I got something to work (replace the  "+" pixmap)
> , but not very robust.
>
> ...
> QPixmap pm(myPixmap);
> drag = new QDrag(this);
> ..
> drag->setDragCursor(pm,Qt::CopyAction)
>
> Does not with all pimxaps. For instance did not work with a null
> pixmap, nor did it work with:
>
> QPixmap pm = QCursor(Qt::PointingHandCursor).pixmap();
>
> With a valid png pixmap it does work, so maybe make your own "pointer"
> pixmap and use the setDragCursor() as above.
>
>
>
> On Fri, Aug 14, 2009 at 9:07 AM, Murphy, Sean M.<sean.murphy at gd-ais.com>
> wrote:
> >>  drag = new QDrag(this);
> >>   drag->setPixmap(myPixmap);
> >>
> >> This gives me the "+" along with my icon.
> >
> > The original poster DOESN'T want the "+" icon.  He's trying to move an
> existing item from one spot in the list to another spot on the list.  He's
> not trying to drop a brand new item onto the list and add it.  However when
> he starts dragging the existing item to move it, the drag/drop system
> modifies the cursor to include the "+" icon, which he feels is confusing to
> his users since they aren't really adding a new item, they are just moving
> an existing item.
> >
> > Sean
> >
> >> What about the Qt demo codes, there must be a drag & drop example
> >> there.  Do these work on your system ?
> >>
> >>
> >>
> >>
> >> On Thu, Aug 13, 2009 at 5:39 PM, Sylvain
> >> Pointeau<sylvain.pointeau at gmail.com> wrote:
> >>> Hi David,
> >>> Thanks for your answer,
> >>> I have absolutely no problem in my code, I am using a abstractModel
> >>> with my QTreeView but the thing is that the cursor is always the
> >>> icon
> >>> (+) even if I press the key "CMD" (to only move the item) this bug
> >>> is really annoying as it show a bad indication to the users ...
> >>> do you see what I mean?
> >>> Cheers,
> >>> Sylvain
> >>> On Fri, Aug 14, 2009 at 2:22 AM, David Boosalis
> >>> <david.boosalis at gmail.com>
> >>> wrote:
> >>>>
> >>>> I have the used the following code to accept drag & drop,
> >>>> somethings may not make sense to youas they relate to my code, but
> >>>> it may give you some clues as to your problem.
> >>>>
> >>>> -David
> >>>>
> >>>> PS - if still having trouble, paste some of your code in a email
> >>>>
> >>>> setDragDropMode(QAbstractItemView::DragDrop);
> >>>> setDropIndicatorShown(true);
> >>>> ...
> >>>>
> >>>> /********************************************************************
> >>>> */ void MyTreeWidget::dragEnterEvent( QDragEnterEvent *de) {
> >>>>  qDebug("Drage Enter Event....");  if
> >>>> (de->mimeData()->hasFormat("Student")) {    qDebug("Accept drag event
> >>>> ....");    dragMode = MyEnumValue;    de->acceptProposedAction();  }
> >>>>  else    qDebug("DO NOT ACCEPT"); }
> >>>>
> >>>> /********************************************************************
> >>>> */ void MyTreeWidget::dragMoveEvent(QDragMoveEvent *dm) {
> >>>>  dm->acceptProposedAction(); }
> >>>>
> >>>> /********************************************************************
> >>>> */ void MyTreeWidget::dropEvent(QDropEvent *event) {  QStringList
> >>>> strList;  QString str;  bool okay;
> >>>>
> >>>>
> >>>>  QByteArray byteArray;
> >>>>  const QMimeData *mimeData;
> >>>>  .....
> >>>>  // if (event->proposedAction() == Qt::CopyAction) {
> >>>>  event->acceptProposedAction();
> >>>>  mimeData = event->mimeData();
> >>>>  if (mimeData == 0) {
> >>>>      qWarning("Invalid drop - mime data = 0");
> >>>>      return;
> >>>>  }
> >>>>  if (mimeData->hasFormat("Student")) {
> >>>>
> >>>>    byteArray = mimeData->data("Student");
> >>>>    QDataStream ds(&byteArray,QIODevice::ReadWrite);
> >>>>
> >>>>    ds >> studentList;
> >>>>    emit droppedStudents(studentList);
> >>>>  }
> >>>>  QTreeWidget::dropEvent(event);
> >>>>
> >>>>
> >>>> On Thu, Aug 13, 2009 at 3:54 PM, Sylvain
> >>>> Pointeau<sylvain.pointeau at gmail.com> wrote:
> >>>>> Hello,
> >>>>> I have an issue on the drag and drop for a tree view on Macosx
> >>>>> The cursor is always a (+) even if we only move an item (with CMD
> >>>>> pressed (should be alt by the way)) what should I do for this bug
> >>>>> to be solved?
> >>>>> Cheers,
> >>>>> Sylvain
> >
>
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