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We have shown how to implement drag and drop support and how to implement cut, copy, paste support. How do you combine both in one component?
You implement both within the TransferHandler
's importData
method, like this:
if (transferSupport.isDrop()) { // put data in transferSupport.getDropLocation() } else { // determine where you want the paste to go (ex: after current selection) // put data there }
The ListCutPaste
example, discussed on the
CCP in a non-Text Component page, supports both dnd and ccp. Here is its importData
method (the if
-else
drop logic is bolded):
public boolean importData(TransferHandler.TransferSupport info) { String data = null; //If we cannot handle the import, bail now. if (!canImport(info)) { return false; } JList list = (JList)info.getComponent(); DefaultListModel model = (DefaultListModel)list.getModel(); //Fetch the data -- bail if this fails try { data = (String)info.getTransferable().getTransferData(DataFlavor.stringFlavor); } catch (UnsupportedFlavorException ufe) { System.out.println("importData: unsupported data flavor"); return false; } catch (IOException ioe) { System.out.println("importData: I/O exception"); return false; } if (info.isDrop()) { //This is a drop JList.DropLocation dl = (JList.DropLocation)info.getDropLocation(); int index = dl.getIndex(); if (dl.isInsert()) { model.add(index, data); return true; } else { model.set(index, data); return true; } } else { //This is a paste int index = list.getSelectedIndex(); // if there is a valid selection, // insert data after the selection if (index >= 0) { model.add(list.getSelectedIndex()+1, data); // else append to the end of the list } else { model.addElement(data); } return true; } }
This is the only place where you need to install if
-else
logic to distinguish between dnd and ccp.