|
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
Getting Started 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.
|
