Drag n drop problem with Linux

MeyerDumont

Hi, I got a small application with drag n drop in a treeview perfectly working on windows. When i try it on linux (Ubuntu) I got many problems :

I don't have any visual feedback when I move items around ( no action icons ( move, copy, forbidden))
When I accept an event only once in the dragMoveEvent function during the movement of an item, the dropEvent function will be called, even if I ignore the event after.

=> The only way for the dropEvent to not be called is to avoid passing over an "acceptable droppable location"

Any idea ?

Thanks in advance
Meyer

stryga42

Which distro & which WM? Can you post some skeleton code which demonstrates the issue? And are you dragging within your app or across applications?

MeyerDumont

@stryga42 Ubuntu 22.04.2 LTS with the standard wayland WM.
I am dragging within my app (I drag a treeItem from its location to another in the same treeview).

The code itself is very basic and it works as expected on windows

void ProjectWidget::dragMoveEvent(QDragMoveEvent * event)
{
    QTreeWidgetItem* currentItem = itemAt(event->position().toPoint());

    if (currentItem == NULL)
        {
            event->ignore();
            return;
        }
    if (latestDraggedItem == NULL)
        {
            event->ignore();
            return;
        }

    QVariant v = latestDraggedItem->data(0,Qt::UserRole);
    if (v.value<ModelTemplate *>())
        {
        if (currentItem == cardNode)             
            {
            event->setDropAction(Qt::MoveAction);
            event->accept();
            return;
            }
       }

event->ignore();
}