Hi Ben,
There's a lot of ways to approach Drag and Drop, and none of them are
particularly straightforward in my experience. The key to remember is
that what is passed in a drag and drop operation is Mime Data (as you
indicated you looked into) and not a direct object. My initial guess
(and this is just that, so take it with a grain of salt) is that your
event filter is responding to the source of the drop event (and
qt_scrollarea_viewport is the internal viewport of the QTreeView where
you installed the filter), not the source of the drag. Generally what
I've had the most success with in drag and drop was encoding a set of
data into a custom mime-type, and then in your drop handler you can read
that mime data. Everything else has been unreliable. I'll whip up some
sample code for you today and send it over.
In the meantime, the specific method(s) you're looking for (at least
what I've had the most success with) is dropMimeData() in your
TreeWidget (the destination), and mimeData() in your TableWidget (the
source). mimeData(items) will encode data as you choose into a
(potentially custom) mimeType, and then dropMimeData(parent, index,
data, action) will decode that data and handle the results of the drop.
With that said, I've primarily worked in the QAbstractItemModel,
QTreeView, and QTableView version so I could separate the model out, so
this might be higher complexity than you're looking for. I'll let you know.
On 4/22/2015 6:46 AM, Benjam901 wrote:
Hello all,
I am having a bit of trouble with my QT Drag and Drop events. I am
dragging an item from a QTableWidget (uiNodeUnit) and dropping it onto
a QTreeWidget (uiUnitTree)
I have managed to set up an event filter on the QTreeWidget and when
the item is dropped the event is fired. However I am struggling to
return the name of the item that has been dragged in, I have looked
into startDrag and mime data but no luck on my end so far. Is there
some method that I am missing.
One extra thing, when I print source.objectName() the value is very
odd indeed. The value I get returned is: qt_scrollarea_viewport should
it be one of my widgets or have I set it up incorrectly?
Cheers,
Ben
My code is as follows:
12345678910111213
# Inside the __init__ function
self.uiMainWindow.uiNodeUnit.setDragEnabled(True)
self.uiMainWindow.uiUnitTree.setDropIndicatorShown(True)
self.uiMainWindow.uiUnitTree.setAcceptDrops(True)
self.uiMainWindow.uiUnitTree.setDragEnabled(True)
self.uiMainWindow.uiUnitTree.viewport().installEventFilter(self)
def eventFilter(self, source, event):
#print source.objectName()
if (event.type() == QtCore.QEvent.Drop):
print "Event Filter"
return QtGui.QMainWindow.eventFilter(self, source, event)
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