/***************************************************************************
 *   Copyright (c) 2023 Boyer Pierre-louis <pierrelouis.boyer@gmail.com>   *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/

#include "PreCompiled.h"
#ifndef _PreComp_
# include <QDragMoveEvent>
#endif

#include "QListWidgetDragBugFix.h"


QListWidgetDragBugFix::QListWidgetDragBugFix(QWidget * parent)
  : QListWidget(parent)
{
}

QListWidgetDragBugFix::~QListWidgetDragBugFix()
{
}

/* Qt has a recent bug (2023, https://bugreports.qt.io/browse/QTBUG-100128) 
* where the items disappears in certain conditions when drag and dropping.
* Here we prevent the situation where this happens.
* 1 - If the item is dropped on the item below such that the item doesn't move (ie superior half of the below item)
* 2 - The item is the last one and user drop it on the empty space below.
* In both those cases the item widget was lost.
 */
void QListWidgetDragBugFix::dragMoveEvent(QDragMoveEvent *e)
{
    if ((row(itemAt(e->pos())) == currentRow() + 1) 
        || (currentRow() == count() - 1 && row(itemAt(e->pos())) == -1)) {
        e->ignore();
    }
    else {
        QListWidget::dragMoveEvent(e);
    }
}

#include "moc_QListWidgetDragBugFix.cpp"