package draganddrop;

import org.gnu.gdk.DragAction;
import org.gnu.gdk.ModifierType;
import org.gnu.gtk.Button;
import org.gnu.gtk.DestDefaults;
import org.gnu.gtk.Gtk;
import org.gnu.gtk.HBox;
import org.gnu.gtk.TargetEntry;
import org.gnu.gtk.TargetFlags;
import org.gnu.gtk.Window;
import org.gnu.gtk.WindowType;
import org.gnu.gtk.event.DragTargetAdapter;
import org.gnu.gtk.event.DragOriginAdapter;
import org.gnu.gtk.event.DropDragEvent;
import org.gnu.gtk.event.LifeCycleEvent;
import org.gnu.gtk.event.LifeCycleListener;
import org.gnu.gtk.event.ReceiveDragDataEvent;
import org.gnu.gtk.event.RequestDragDataEvent;

/**
 */
public class DnDExample1 {

    private Window win;

    private TargetEntry[] target = new TargetEntry[] { new TargetEntry(
            "text/plain", TargetFlags.NO_RESTRICTION, 0) };

    public DnDExample1() {
        win = new Window(WindowType.TOPLEVEL);
        win.setBorderWidth(25);
        win.setTitle("Java-Gnome Drag and Drop Example");
        win.addListener(new LifeCycleListener() {
            public void lifeCycleEvent(LifeCycleEvent event) {
            }

            public boolean lifeCycleQuery(LifeCycleEvent event) {
                if (event.isOfType(LifeCycleEvent.Type.DESTROY)
                        || event.isOfType(LifeCycleEvent.Type.DELETE)) {
                    Gtk.mainQuit();
                }
                return false;
            }
        });

        HBox box = new HBox(true, 0);
        win.add(box);

        packSendingButton(box, "Left Source Text");
        packReceivingButton(box, "Destination Window");
        packSendingButton(box, "Right Source Text");

        win.showAll();
    }

    private void packSendingButton(HBox box, String text) {
        Button button = new Button(text, false);
        box.packStart(button, true, false, 0);
        button.addListener(new DragOriginAdapter() {
            public void dataRequested(RequestDragDataEvent event) {
                Button but = (Button) event.getSource();
                event.getSelectionData().setText(but.getLabel());
            }
        });
        button
                .setDragSource(ModifierType.BUTTON1_MASK, target,
                        DragAction.COPY);
    }

    private void packReceivingButton(HBox box, String text) {
        Button button = new Button(text, false);
        box.packStart(button, true, false, 0);
        button.addListener(new DragTargetAdapter() {
            public void dataReceived(ReceiveDragDataEvent event) {
                Button but = (Button) event.getSource();
                but.setLabel(event.getSelectionData().getText());
            }

            public boolean dropped(DropDragEvent event) {
                return true;
            }
        });
        button.setDragDestination(DestDefaults.MOTION.or(DestDefaults.HIGHLIGHT
                .or(DestDefaults.DROP)), target, DragAction.COPY);
    }

    public static void main(String[] args) {
        Gtk.init(args);
        DnDExample1 example = new DnDExample1();
        Gtk.main();
    }
}