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    <p>You just implement <a href="http://doc.trolltech.com/latest/qdrag.html#details" rel="nofollow noreferrer">the drag part</a>. You don't need to know where the drop happen because the application receiving it will handle it and decide where to store your file.</p> <p>You create a <a href="http://doc.trolltech.com/latest/qmimedata.html#setData" rel="nofollow noreferrer">QMimeData</a>, not sure which type but from what i saw <a href="http://doc.trolltech.com/latest/dnd.html#interoperating-with-other-applications" rel="nofollow noreferrer">here</a> and <a href="http://www.freedesktop.org/wiki/Specifications/XDS" rel="nofollow noreferrer">here</a>, maybe "application/octet-stream" with your file as data in a QByteArray or "text/uri-list" with url to your file.</p> <p>You create a QDrag, and use its setMimeData() method and exec() (not sure about which QT::DropAction to choose).</p> <p>Here is an example (disclamer : i did it with color not files) :</p> <pre><code>void DraggedWidget::mousePressEvent(QMouseEvent *event) { if (event-&gt;button() == Qt::LeftButton) start_pos = event-&gt;pos(); } void DraggedWidget::mouseMoveEvent(QMouseEvent *event) { if (event-&gt;buttons() &amp; Qt::LeftButton) { int distance = (event-&gt;pos() - start_pos).manhattanLength(); if (distance &gt;= QApplication::startDragDistance()) { /* Drag */ QMimeData *mime_data = new QMimeData; mime_data-&gt;setData( ... ); QDrag *drag = new QDrag(this); drag-&gt;setMimeData(mime_data); drag-&gt;exec(Qt::CopyAction); } } } </code></pre> <p>Sorry it's quite incomplete, i hope it helps a little.</p>
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    1. POQt 4.x: how to implement drag-and-drop onto the desktop or into a folder?
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    1. USLeiaz
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    1. COThe problem is that the data in the file is not available until after the download has completed, and a multi-gigabyte download might take an hour or more. So I need to know where the drop has happened so that my app can start a download thread to write data to that location. A system that relies on the data already being locally present at the time of the drag won't work for me, AFAICT. Including a URI to the file might work, but only if the file can be accessed via a protocol the OS knows how to download (e.g. HTTP?). Currently the server uses a proprietary protocol. Hmm....
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      1. USJeremy Friesner
 

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