Klaus Nowikow wrote:
> Hi,
>
> I am trying to drag some data in form of a nsIRDFResource
> from one window of my xulrunner application to another one.
>
> Creating an interface pointer object
> (@mozilla.org/supports-interface-pointer;1)
> and adding this to the SupportsArray fails when I try to get the transfer
> data at the drop site.
I thought I'd post some code to show what I did. I am using PyXPCOM, the
platform
is xulrunner-i686-pc-linux-gnu (xulrunner 1.9a6pre).
When I use a string ('@mozilla.org/supports-string;1') object for the drag
data instead of the rdf resource, everything works fine.
In the ondraggesture handler of the drag source (a XUL tree):
<code>
dragService =
components.classes['@mozilla.org/widget/dragservice;1'].getService(nsIDragService)
rdf =
components.classes['@mozilla.org/rdf/rdf-service;1'].getService(nsIRDFService)
resource = components.classes[
'@mozilla.org/supports-interface-pointer;1'
].createInstance(nsISupportsInterfacePointer)
resource.dataIID = nsIRDFResource
resource.data = rdf.GetAnonymousResource()
transferable = components.classes[
'@mozilla.org/widget/transferable;1'
].createInstance(nsITransferable)
transferable.addDataFlavor('application/x-my-test')
transferable.setTransferData('application/x-my-test', resource, 1)
transferables = components.classes[
'@mozilla.org/supports-array;1'
].createInstance(nsISupportsArray)
transferables.AppendElement(transferable)
# event is the nsIDOMMouseEvent
dragService.invokeDragSession(
event.target,
transferables,
None,
nsIDragService.DRAGDROP_ACTION_COPY
)
event.stopPropagation()
</code>
And in the ondragdrop handler of the drop target:
<code>
dragService = components.classes[
'@mozilla.org/widget/dragservice;1'
].getService(nsIDragService)
session = dragService.getCurrentSession()
if not session.isDataFlavorSupported('application/x-my-test'):
return
for index in range(0, session.numDropItems):
transferable = components.classes[
'@mozilla.org/widget/transferable;1'
].createInstance(nsITransferable)
transferable.addDataFlavor('application/x-my-test')
session.getData(transferable, index)
# This line fails!!! It works when I use a supports-string object
# instead of the rdf resource
data, len = transferable.getTransferData('application/x-my-test')
print data, len
event.stopPropagation()
</code>
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