[Interest] Getting QTreeView item click offset for DnD
Jason H
scorp1us at yahoo.com
Wed Apr 18 16:07:25 CEST 2012
Please, any help?
I'm stuck.
________________________________
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>
>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);
>>QModelIndexmi=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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