Re: [Interest] Model/Views and Drag&Drop actions

[Jason H]

With the &, it looks like it's using a bitmask. Make sure that the dropAction() and supportedDropActions() values are arranged correctly, as a bitmask.

 

 

00100 * 00111  = 00100, return true. Therefore the only other thing is it is a mime issue?

 

Sent: Monday, March 27, 2017 at 9:28 AM
From: "Etienne Sandré-Chardonnal" <etienne.san...@m4x.org>
To: "interest@qt-project.org" <Interest@qt-project.org>
Subject: [Interest] Model/Views and Drag&Drop actions

Dear all,
 

I have two custom models associated with views and I would like to drag from model A and drop into model B.
 

Model B has overloaded supportedDropActions and returns Qt::LinkAction
 

Model A has overloaded supportedDragActions and returns Qt::MoveAction | Qt::LinkAction
 

This does not work as the cursor turns to a forbidden sign when dragging over B.
 

If model A supportedDragActions returns Qt::LinkAction only, then this works.
 

 

If I look to the source code of QAbstractItemViewPrivate, i find in canDecode(QDropEvent * e):

            if (mime->hasFormat(modelTypes.at(i))
               && (e->dropAction() & model->supportedDropActions()))
                return true;
 

Which explains the issue, the event handler does not check the event's possible drop actions and does not call setDropAction if the proposed action is not supported.
 

Is this a bug or a feature?

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