org.eclipse.swt.snippets.Snippet78.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet78.java

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/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Drag and Drop example snippet: drag text between two labels
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet78 {

    public static void main(String[] args) {

        Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Snippet 78");
        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() {
            @Override
            public void dragStart(DragSourceEvent event) {
                event.doit = (label.getText().length() != 0);
            }

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

            @Override
            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() {
            @Override
            public void drop(DropTargetEvent event) {
                if (event.data == null) {
                    event.detail = DND.DROP_NONE;
                    return;
                }
                label.setText((String) event.data);
            }
        });
    }
}