I am getting hang when drop event during file loading?

[amarism]

I am using the drag and drop functionality inside m project. i am getting hang when i will drop image inside the viewer because file loading take some file to load it.

drop.cpp

void drop::dropEvent(QDropEvent *event)
{
const QMimeData *mimeData = event->mimeData();
int row,col;
    QImage image = qvariant_cast<QImage>(event->mimeData()->imageData());
QListWidget *child = static_cast<QListWidget*>(childAt(event->pos()));

if (mimeData->hasFormat("application/x-qabstractitemmodeldatalist")) {
	QByteArray encoded = mimeData->data("application/x-qabstractitemmodeldatalist");
	QDataStream stream(&encoded, QIODevice::ReadOnly);
while (!stream.atEnd()) {
		QMap<int, QVariant> roleDataMap;
		stream >> row >> col >> roleDataMap ;
		QIcon icon = roleDataMap.value(1).value<QIcon>();
		m_pixmap = icon.pixmap(icon.availableSizes().first());
		update();
	}
	event->acceptProposedAction();
	
}
else {
	event->ignore();
}
emit DragDropObject(row); // here i am calling the loading function
}

So my question is how can i release the drop event before calling the loading of file.

[SGaist]

Hi,

You could use a single shot QTimer with 0 as timeout value and trigger your method in the slot connected to it (or a lambda).

[amarism]

@SGaist could u please write some piece of code

[amarism]

@SGaist emit signal are present in drag.cpp class and signal and slot are present in mainwindow.cpp class. Then who could i pass the QTimer in it?

[SGaist]

Please take a look at the method documentation.

[J.Hilk]

@amarism
to give you a 2nd option, you could, give your connect statement - the one in mainwindow.cpp - Qt::QueuedConnection as a 5th parameter, that will have the same effect as a singleShot QTimer with a timeout of 0 but with slightly less overhead.

[amarism]

@J.Hilk thank you @J-Hilk ... this one working for me...

[cemlysoy]

This post is deleted!