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import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.DropTargetListener;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;
public class Ch12DnDComposite extends Composite {
public Ch12DnDComposite(Composite parent) {
super(parent, SWT.NONE);
FillLayout layout = new FillLayout();
setLayout(layout);
Text leftText = new Text(this, SWT.MULTI);
Text rightText = new Text(this, SWT.MULTI);
createDragSource(leftText);
createDragSource(rightText);
createDropTarget(leftText);
createDropTarget(rightText);
}
private void createDropTarget(final Text targetText) {
Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
DropTarget dropTarget = new DropTarget(targetText, DND.DROP_COPY);
dropTarget.setTransfer(types);
dropTarget.addDropListener(new DropTargetListener() {
public void dragEnter(DropTargetEvent event) {
}
public void dragLeave(DropTargetEvent event) {
}
public void dragOperationChanged(DropTargetEvent event) {
}
public void dragOver(DropTargetEvent event) {
}
public void drop(DropTargetEvent event) {
String data = (String) event.data;
targetText.append(data);
}
public void dropAccept(DropTargetEvent event) {
}
});
}
private void createDragSource(final Text sourceText) {
Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
DragSource dragSource = new DragSource(sourceText, DND.DROP_COPY);
dragSource.setTransfer(types);
dragSource.addDragListener(new DragSourceListener() {
public void dragStart(DragSourceEvent event) {
if (sourceText.getSelectionText().length() > 0) {
event.doit = true;
}
}
public void dragSetData(DragSourceEvent event) {
event.data = sourceText.getSelection();
}
public void dragFinished(DragSourceEvent event) {
//do nothing
}
});
}
}
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