draglistbox.cpp

/*
    SPDX-FileCopyrightText: 2005 Jason Harris <kstars@30doradus.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#include "draglistbox.h"
 
#include <KLocalizedString>
 
#include <QDrag>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QMimeData>
#include <QMouseEvent>
 
DragListBox::DragListBox(QWidget *parent, const char *name) : QListWidget(parent)
{
    if (name)
    {
        setObjectName(name);
    }
    setAcceptDrops(true);
}
 
bool DragListBox::contains(const QString &s) const
{
    QList<QListWidgetItem *> foundList = findItems(s, Qt::MatchExactly);
    if (foundList.isEmpty())
        return false;
    else
        return true;
}
 
void DragListBox::dragEnterEvent(QDragEnterEvent *evt)
{
    if (evt->mimeData()->hasText())
    {
        evt->acceptProposedAction();
    }
    else
    {
        evt->ignore();
    }
}
 
void DragListBox::dragMoveEvent(QDragMoveEvent *evt)
{
    if (evt->mimeData()->hasText())
    {
        evt->acceptProposedAction();
    }
    else
    {
        evt->ignore();
    }
}
 
void DragListBox::dropEvent(QDropEvent *evt)
{
    QString text;
 
    if (evt->mimeData()->hasText())
    {
        text = evt->mimeData()->text();
 
        //Copy an item dragged from FieldPool to FieldList
        //If we dragged an "Ignore" item from the FieldPool to the FieldList, then we don't
        //need to insert the item, because FieldPool already has a persistent Ignore item.
        if (!(text == i18n("Ignore") && QString(evt->source()->objectName()) == "FieldList" && evt->source() != this))
        {
            QListWidgetItem *lwi = itemAt(evt->pos());
            if (lwi == nullptr && evt->pos().y() > visualItemRect(item(count() - 1)).bottom())
            {
                addItem(text);
            }
            else
            {
                int i = row(itemAt(evt->pos()));
                insertItem(i, text);
            }
        }
 
        //Remove an item dragged from FieldList to FieldPool.
        //If we dragged the "Ignore" item from FieldList to FieldPool, then we don't
        //want to remove the item from the FieldPool
        if (!(text == i18n("Ignore") && QString(evt->source()->objectName()) == "FieldPool" && evt->source() != this))
        {
            DragListBox *fp = (DragListBox *)evt->source();
            delete fp->takeItem(fp->currentRow());
        }
    }
    evt->acceptProposedAction();
}
 
void DragListBox::mousePressEvent(QMouseEvent *evt)
{
    QListWidget::mousePressEvent(evt);
 
    if (evt->button() == Qt::LeftButton)
    {
        leftButtonDown = true;
    }
}
 
void DragListBox::mouseReleaseEvent(QMouseEvent *evt)
{
    QListWidget::mouseReleaseEvent(evt);
 
    if (evt->button() == Qt::LeftButton)
    {
        leftButtonDown = false;
    }
}
 
void DragListBox::mouseMoveEvent(QMouseEvent *evt)
{
    if (leftButtonDown)
    {
        leftButtonDown = false; //Don't create multiple QDrag objects!
 
        QDrag *drag         = new QDrag(this);
        QMimeData *mimeData = new QMimeData;
        mimeData->setText(currentItem()->text());
        drag->setMimeData(mimeData);
 
        drag->exec();
        evt->accept();
    }
}