listView.setDragSource(new DragSource() {
private LocalManifest content = null;
@Override
public boolean beginDrag(Component component, int x, int y) {
ListView listView = (ListView)component;
FileList fileList = (FileList)listView.getListData();
if (fileList.getLength() > 0) {
content = new LocalManifest();
content.putFileList(fileList);
}
return (content != null);
}
@Override
public void endDrag(Component component, DropAction dropAction) {
content = null;
}
@Override
public boolean isNative() {
return true;
}
@Override
public LocalManifest getContent() {
return content;
}
@Override
public Visual getRepresentation() {
return null;
}
@Override
public Point getOffset() {
return null;
}
@Override
public int getSupportedDropActions() {
return DropAction.COPY.getMask();
}
});
listView.setDropTarget(new DropTarget() {
@Override
public DropAction dragEnter(Component component, Manifest dragContent,
int supportedDropActions, DropAction userDropAction) {
DropAction dropAction = null;
if (dragContent.containsFileList()
&& DropAction.COPY.isSelected(supportedDropActions)) {
dropAction = DropAction.COPY;
}
return dropAction;
}
@Override
public void dragExit(Component component) {
}
@Override
public DropAction dragMove(Component component, Manifest dragContent,
int supportedDropActions, int x, int y, DropAction userDropAction) {
return (dragContent.containsFileList() ? DropAction.COPY : null);
}
@Override
public DropAction userDropActionChange(Component component, Manifest dragContent,
int supportedDropActions, int x, int y, DropAction userDropAction) {
return (dragContent.containsFileList() ? DropAction.COPY : null);
}
@Override
public DropAction drop(Component component, Manifest dragContent,
int supportedDropActions, int x, int y, DropAction userDropAction) {
DropAction dropAction = null;
if (dragContent.containsFileList()) {
try {
listView.setListData(dragContent.getFileList());
dropAction = DropAction.COPY;
} catch(IOException exception) {
System.err.println(exception);
}
}