org.eclipse.swt.snippets.Snippet84.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet84.java

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/*******************************************************************************
 * Copyright (c) 2000, 2017 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: define a default operation (in this example, Copy)
 *
 * 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 Snippet84 {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 84");
        shell.setLayout(new FillLayout());

        final Label label = new Label(shell, SWT.BORDER);
        label.setText("Drag Source");
        DragSource source = new DragSource(label, DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK);
        source.setTransfer(TextTransfer.getInstance());
        source.addDragListener(new DragSourceAdapter() {
            @Override
            public void dragSetData(DragSourceEvent event) {
                event.data = "Text Transferred";
            }

            @Override
            public void dragFinished(DragSourceEvent event) {
                if (event.doit) {
                    String operation = null;
                    switch (event.detail) {
                    case DND.DROP_MOVE:
                        operation = "moved";
                        break;
                    case DND.DROP_COPY:
                        operation = "copied";
                        break;
                    case DND.DROP_LINK:
                        operation = "linked";
                        break;
                    case DND.DROP_NONE:
                        operation = "disallowed";
                        break;
                    default:
                        operation = "unknown";
                        break;
                    }
                    label.setText("Drag Source (data " + operation + ")");
                } else {
                    label.setText("Drag Source (drag cancelled)");
                }
            }
        });

        final Text text = new Text(shell, SWT.BORDER | SWT.MULTI);
        text.setText("Drop Target");
        DropTarget target = new DropTarget(text, DND.DROP_DEFAULT | DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK);
        target.setTransfer(TextTransfer.getInstance());
        target.addDropListener(new DropTargetAdapter() {
            @Override
            public void dragEnter(DropTargetEvent event) {
                if (event.detail == DND.DROP_DEFAULT)
                    event.detail = DND.DROP_COPY;
            }

            @Override
            public void dragOperationChanged(DropTargetEvent event) {
                if (event.detail == DND.DROP_DEFAULT)
                    event.detail = DND.DROP_COPY;
            }

            @Override
            public void drop(DropTargetEvent event) {
                String operation = null;
                switch (event.detail) {
                case DND.DROP_MOVE:
                    operation = "moved";
                    break;
                case DND.DROP_COPY:
                    operation = "copied";
                    break;
                case DND.DROP_LINK:
                    operation = "linked";
                    break;
                case DND.DROP_NONE:
                    operation = "disallowed";
                    break;
                default:
                    operation = "unknown";
                    break;
                }
                text.append("\n" + operation + (String) event.data);
            }
        });

        shell.setSize(400, 400);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}