Hi all!
I am currently working on the palette tutorials from the "RCP-Plugging..." book and experience some problems. Drag and drop from the palette using a TopCompontent as drop target works well. But I want to drag a DataNode from the palette to a DataNode in an ExplorerView. This works well with copy & paste, the documentation tells me it should work with drag and drop as well. But it does not. My DataNode source contains little more than the clipboardCopy() implementation:
[...]
@Override
public Transferable clipboardCopy() throws IOException
{
Transferable defaultT = super.clipboardCopy();
ExTransferable added = ExTransferable.create(defaultT);
added.put(new TransferableImpl(this));
return added;
}
private static class TransferableImpl extends ExTransferable.Single
{
BladeManipDataNode _node;
TransferableImpl(BladeManipDataNode node)
{
super(BladesurfaceManipulator.DATAFLAVOR);
_node = node;
}
@Override
protected Object getData() throws IOException, UnsupportedFlavorException
{
return _node.getLookup().lookup(BladesurfaceManipulator.class);
}
}
[...]
My drop target implements both createPasteTypes and getDropType
[...]
@Override
public PasteType getDropType(final Transferable transferable, int dropAction, final int dropIndex)
{
return new PasteType()
{
public Transferable paste() throws IOException
{
System.out.println("drop");
return null;
}
};
}
@Override
protected void createPasteTypes(Transferable t, List s)
{
final Transferable tt = t;
if(t.isDataFlavorSupported(BladesurfaceManipulator.DATAFLAVOR)) {
PasteType ptyp = new PasteType()
{
public Transferable paste() throws IOException
{
try {
BladesurfaceManipulator bsmanip = (BladesurfaceManipulator) tt.getTransferData(
BladesurfaceManipulator.DATAFLAVOR);
_blade.addBladesurfaceManipulator(bsmanip);
}
catch(UnsupportedFlavorException ex) {
Exceptions.printStackTrace(ex);
}
return null;
}
};
s.add(ptyp);
}
super.createPasteTypes(t, s);
}
[...]
Even with the dummy implementation of getDropType() nothing happens when I drag a node from the palette over the target node. The cursor just says dropping is forbidden. And yes, I explicitly tell my BeanTreeView to accept drop events. I can drop any other node - even from my desktop - on the target node and the output is printed correctly. Providing a DragAndDropHandler for the Palette didn't help either. Drag action is called.
What am I missing?
Cheers,
Carsten
