[Interest] Getting QTreeView item click offset for DnD

[Jason H]

That is wrong, because that is the mouse position of the drop location.

Here, let me make a picture
+--------------+
|---deleg.te---|
+--------------+

Now the "." in the delegate is the mouse location. When I drop this delegate on the widget, I get the location of the "." in the widget coordinates. The problem is, if I put an item at that location it is off by
+--------
|---deleg

So I need to subtract (10,2 - in characters) from the "." position(10,2) to get the proper place in the widget to position the item. This is the offset I am looking for.




________________________________
 From: Bill Crocker <william.crocker at analog.com>
To: interest at qt-project.org 
Sent: Wednesday, April 18, 2012 10:17 AM
Subject: Re: [Interest] Getting QTreeView item click offset for DnD
 
On 04/18/2012 10:07 AM, Jason H wrote:
> Please, any help?
>
> I'm stuck.
>

How about this:

const QPoint & QDropEvent::pos () const

     Returns the position where the drop was made.


> --------------------------------------------------------------------------------
> *From:* Jason H <scorp1us at yahoo.com>
> *To:* André Somers <andre at familiesomers.nl>; "interest at qt-project.org"
> <interest at qt-project.org>
> *Sent:* Tuesday, April 17, 2012 11:09 AM
> *Subject:* Re: [Interest] Getting QTreeView item click offset for DnD
>
> Yes. However nothing gives me the click coordinates.
>
> I am dragging an item to a subclassed QLabel. When the drop occurs, the top-left
> of the item is placed at the mouse cursor. This is wrong. The item should be
> placed at wherever Qt drew it last, which is offset by the mouse coords in the
> item.
>
>
> --------------------------------------------------------------------------------
> *From:* André Somers <andre at familiesomers.nl>
> *To:* "interest at qt-project.org" <interest at qt-project.org>
> *Sent:* Tuesday, April 17, 2012 11:00 AM
> *Subject:* Re: [Interest] Getting QTreeView item click offset for DnD
>
> Op 17-4-2012 16:54, Jason H schreef:
>> Well I am confused about how the view works.
>> I'm using QStandardItems, so whatever Qt does with those... I can't find
>> documentation anywhere...
>>
> The items in the model do not become widgets. That would be very inefficient.
> Instead, they are rendered in the view using a delegate that has been set on
> your view. By default, that is a QStyledItemDelegate.
>
> Anyway, for D&D purposes, an item is just a package of data. At the moment you
> have the model index, you have access to the data of the item.
>
> Perhaps the question should be: why are you reimplementing the mousePressEvent
> in this context at all? Did you study the "Using Drag and Drop with Item Views"
> topic from the Model/View Programming documentation page?
>
> André
>
>
>>
>> --------------------------------------------------------------------------------
>> *From:* André Somers <andre at familiesomers.nl> <mailto:andre at familiesomers.nl>
>> *To:* interest at qt-project.org <mailto:interest at qt-project.org>
>> *Sent:* Tuesday, April 17, 2012 10:40 AM
>> *Subject:* Re: [Interest] Getting QTreeView item click offset for DnD
>>
>> Op 17-4-2012 16:35, Jason H schreef:
>>> I need to repeat this. I'm still lost.
>>> here is my code (child is always NULL):
>>> voidDataPointTreeView::mousePressEvent(QMouseEvent*event)
>>> {
>>>     QTreeView::mousePressEvent(event);
>>>     QModelIndex  mi  =  indexAt(event->pos());
>>>     QWidget  *child  =  indexWidget(mi);
>>>     //QWidget  *child  =  static_cast<QWidget*>(childAt(event->pos()));
>>>     if  (!child)
>>>         return;
>>>
>>>     m_dragOffset  =  event->pos()  -  child->pos();
>>> }
>>>
>> Are you even using widgets for your items? I mean: do you call setIndexWidget
>> anywhere? If not, perhaps you should check what indexWidget() actually returns?
>
>
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