[Interest] Getting QTreeView item click offset for DnD
André Somers
andre at familiesomers.nl
Tue Apr 17 17:00:47 CEST 2012
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>
> *To:* 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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