Drag and Drop From/To Desktop

[scayetanot]

hi,

I'm developping an app to transfer app between a Mac and and Android device.

I can drag files from Finder to the app I develop to transfer pics for example but I wasn't be able to triggered the event when I'm dragging file from the app to the finder.

The app is defined by a QTreeWidget

@class TreeView : public QTreeWidget
{
Q_OBJECT
....@

I have overloaded the function below :

@void TreeView::dragEnterEvent(QDragEnterEvent *event)
{
qDebug() << "Drag enter event";

const QMimeData* mimeData = event->mimeData();

setBackgroundRole(QPalette::Highlight);
if(mimeData->hasUrls()) {
    event->acceptProposedAction();
  //  emit changed(mimeData);
}

}

void TreeView::dropEvent(QDropEvent event)
{
qDebug() << "On Drop Event";
std::cout << "On Drop Event";
const QMimeData mimeData = event->mimeData();

if (mimeData->hasUrls())
{
    QStringList pathList;
    QList<QUrl> urlList = mimeData->urls();
    QByteArray appData;

    for (int i = 0; i < urlList.size() && i < 32; ++i)
    {
        pathList.append(urlList.at(i).toLocalFile&#40;&#41;);
    }
    setBackgroundRole(QPalette::Dark);
    qDebug() << "On Drop Event look for selected items";
    qDebug() << pathList[0];


    QTreeWidgetItem * item = itemAt(event->pos());
    event->setDropAction(Qt::CopyAction);

    if(item) {
        Dialog *MyProgress = new Dialog();
        MyProgress->WaitBoxDialog();
        QString str = item->text(0);
        m_device.CopyFilesFromLocal(pathList, str);
        qDebug() << "On Drop Event : " << str << " Selected";
        MyProgress->DestroyWaitBoxDialog();
        event->acceptProposedAction();
    }
    else {
        qDebug() << "On Drop Event : no Selected items";
        event->ignore();
    }
    DisplayFilesAndFolders(0);
}
else
    event->ignore();

}
void TreeView::dragMoveEvent(QDragMoveEvent * event)
{
qDebug() << "On Drag Move Event";
const QMimeData* mimeData = event->mimeData();

event->setDropAction(Qt::CopyAction);

if (mimeData->hasUrls())
{
    QTreeWidgetItem *item = itemAt(event->pos());
    if(item) {
        qDebug() << "itemat: " << item->text(0);

#if 0
setStyleSheet(QString::fromUtf8("QTreeWidget::item:hover {\n"
"background-color: rgb(123, 45, 67);\n"
"}"));
#endif
}
event->setDropAction(Qt::CopyAction);
event->acceptProposedAction();
}
else
event->ignore();

// dropSite = event->answerRect();
// event->acceptProposedAction();
}

void TreeView::dragLeaveEvent(QDragLeaveEvent* event)
{
qDebug() << "On Drag Leave Event";

//event->setDropAction(Qt::CopyAction);

// event->acceptProposedAction();

std::vector<QString>::iterator it;

for(it=DnDList.begin(); it<DnDList.end(); it++) {
    QString file = (*it);
    m_device.SendFilesToLocal(file);
}

// DnDclear();
event->accept();
}@

And all the items of the treeview are set with the flags:

@item->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled
@
Any idea, why it works from Finder to app but not from app to Finder ?

[raven-worx]

An idea which enables (a platform independent) way to copy files:

reimplement QAbstractItemModel::mimeData() so it contains a file uri-list

there return a custom QMimeData implementation which reimplements QMimeData::retrieveData()

The basic idea in the QMimeData::retrieveData() implementation is

that you create a temporary file

write the contents to the temp file

return the path to the temp file

this will start a copy of the temp-file to the drop destination in the desktop.

[scayetanot]

I was finally able to progress but the drag/drop now is not copying the file byt c reate a file locally on the mac (desktop in my case) which contain the file name I want to move.