Snippet78.java Source code

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Here is the source code for Snippet78.java

Source

/*
 * Drag and Drop example snippet: drag text between two labels
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
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.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.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class Snippet78 {

    public static void main(String[] args) {

        Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        final Label label1 = new Label(shell, SWT.BORDER);
        label1.setText("TEXT");
        final Label label2 = new Label(shell, SWT.BORDER);
        setDragDrop(label1);
        setDragDrop(label2);
        shell.setSize(200, 200);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

    public static void setDragDrop(final Label label) {

        Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
        int operations = DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK;

        final DragSource source = new DragSource(label, operations);
        source.setTransfer(types);
        source.addDragListener(new DragSourceListener() {
            public void dragStart(DragSourceEvent event) {
                event.doit = (label.getText().length() != 0);
            }

            public void dragSetData(DragSourceEvent event) {
                event.data = label.getText();
            }

            public void dragFinished(DragSourceEvent event) {
                if (event.detail == DND.DROP_MOVE)
                    label.setText("");
            }
        });

        DropTarget target = new DropTarget(label, operations);
        target.setTransfer(types);
        target.addDropListener(new DropTargetAdapter() {
            public void drop(DropTargetEvent event) {
                if (event.data == null) {
                    event.detail = DND.DROP_NONE;
                    return;
                }
                label.setText((String) event.data);
            }
        });
    }
}