import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceAdapter;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class SimpleDNDExample {
public static void main(String[] args) {
Shell shell = new Shell();
shell.setLayout(new FillLayout());
// Create the tree and some tree items
final Tree tree = new Tree(shell, SWT.NONE);
TreeItem item1 = new TreeItem(tree, SWT.NONE);
item1.setText("Item 1");
TreeItem item2 = new TreeItem(tree, SWT.NONE);
item2.setText("Item 2");
TreeItem item3 = new TreeItem(tree, SWT.NONE);
item3.setText("Item 3");
TreeItem item4 = new TreeItem(tree, SWT.NONE);
item4.setText("Item 4");
// Create the drag source on the tree
DragSource ds = new DragSource(tree, DND.DROP_MOVE);
ds.setTransfer(new Transfer[] { TextTransfer.getInstance() });
ds.addDragListener(new DragSourceAdapter() {
public void dragSetData(DragSourceEvent event) {
// Set the data to be the first selected item's text
event.data = tree.getSelection()[0].getText();
}
});
// Create the button
final Button button = new Button(shell, SWT.FLAT);
button.setText("Button");
button.setAlignment(SWT.CENTER);
// Create the drop target on the button
DropTarget dt = new DropTarget(button, DND.DROP_MOVE);
dt.setTransfer(new Transfer[] { TextTransfer.getInstance() });
dt.addDropListener(new DropTargetAdapter() {
public void drop(DropTargetEvent event) {
// Set the buttons text to be the text being dropped
button.setText((String) event.data);
}
});
shell.pack();
shell.open();
Display display = Display.getDefault();
while (!shell.isDisposed())
if (!display.readAndDispatch())
display.sleep();
display.dispose();
}
}