Drag and Drop items in QListWidget

[tommynator128]

Hello,

i've got an list widget that should be able to accept file drops and be able of drag and drop the items into the desired order. if i do all this stuff and remove my own drop event functions it still duplicates the item. if i got my own drop event function there is no possibility of dropping files. how should i do this?

thanks
tommy

[JohannesMunk]

Hi Tommy!

I find it hard to guess what you might have done wrong. Could you post your source code? Preferably just the relevant but still compilable parts.

Johannes

[tommynator128]

.h

#ifndef FILELIST_H
#define FILELIST_H

#include <QtGui>
#include <QtCore>


class FileList : public QListWidget
{
Q_OBJECT

public:
FileList();

protected:
void dragEnterEvent(QDragEnterEvent *event);
void dragMoveEvent(QDragMoveEvent *event);
void dragLeaveEvent(QDragLeaveEvent *event);
void dropEvent(QDropEvent *event);
};

#endif

.cpp

#include <QtGui>

#include "fileList.h"



FileList::FileList()
{
setAlternatingRowColors(true);
dropHintItem = new QListWidgetItem;
dropHintItem->setText("Drop Files here...");
dropHintItem->setFlags(dropHintItem->flags() & ~(Qt::ItemIsDropEnabled));
insertItem(0, dropHintItem);
setAcceptDrops(true);
}

void FileList::dragEnterEvent(QDragEnterEvent *event)
{
event->acceptProposedAction();
}

void FileList::dragMoveEvent(QDragMoveEvent *event)
{
event->acceptProposedAction();
}

void FileList::dropEvent(QDropEvent *event) {
const QMimeData *mimeData = event->mimeData();
if (mimeData->hasUrls()) {
//Insert the URLs and set flags to Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled | defaultFlags;
}
event->acceptProposedAction();
}

void FileList::dragLeaveEvent(QDragLeaveEvent *event)
{
event->accept();
}

[JohannesMunk]

Hi!

Deep in the docs I found: http://doc.trolltech.com/latest/model-view-programming.html#using-drag-drop-with-item-views

The following seems to do what you want:


#include "FileList.h"

FileList::FileList()
{
setAcceptDrops(true);
setDragEnabled(true);

setSelectionMode(QAbstractItemView::SingleSelectio n);
setDropIndicatorShown(true);
setDragDropMode(QAbstractItemView::InternalMove);

setAlternatingRowColors(true);

dropHintItem = new QListWidgetItem("Drop Files here...",this);
}

void FileList::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasUrls())
{
event->acceptProposedAction();
} else {
QListWidget::dragEnterEvent(event);
}
}

void FileList::dragMoveEvent(QDragMoveEvent *event)
{
if (event->mimeData()->hasUrls())
{
event->acceptProposedAction();
} else {
QListWidget::dragMoveEvent(event);
}
}

void FileList::dropEvent(QDropEvent *event)
{
if (event->mimeData()->hasUrls())
{
QList<QUrl> urls = event->mimeData()->urls();
if (!urls.isEmpty())
{
if (dropHintItem)
{
delete dropHintItem;
dropHintItem = 0;
}
QUrl url;
foreach (url,urls)
{
new QListWidgetItem(url.toLocalFile(),this);
}
}
event->acceptProposedAction();
}
QListWidget::dropEvent(event);
}


Joh

[abeinoe]

thank..it's the solution for my problem on mac os. my old code worked fine on windows but not in mac.