[Qt-interest] QTreeView Drag&Drop issue

[Murphy, Sean M.]

>  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