org.eclipse.swt.snippets.Snippet210.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet210.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 text between two StyledText widgets
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.2
 */
import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet210 {
    static String string1 = "A drag source is the provider of data in a Drag and Drop data transfer as well as "
            + "the originator of the Drag and Drop operation. The data provided by the drag source "
            + "may be transferred to another location in the same widget, to a different widget "
            + "within the same application, or to a different application altogether. For example, "
            + "you can drag text from your application and drop it on an email application, or you "
            + "could drag an item in a tree and drop it below a different node in the same tree.";

    static String string2 = "A drop target receives data in a Drag and Drop operation. The data received by "
            + "the drop target may have come from the same widget, from a different widget within "
            + "the same application, or from a different application altogether. For example, you "
            + "can drag text from an email application and drop it on your application, or you could "
            + "drag an item in a tree and drop it below a different node in the same tree.";

    public static void main(String[] args) {
        final Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 210");
        shell.setLayout(new FillLayout());
        int style = SWT.MULTI | SWT.WRAP | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER;
        final StyledText text1 = new StyledText(shell, style);
        text1.setText(string1);
        DragSource source = new DragSource(text1, DND.DROP_COPY | DND.DROP_MOVE);
        source.setTransfer(TextTransfer.getInstance());
        source.addDragListener(new DragSourceAdapter() {
            Point selection;

            @Override
            public void dragStart(DragSourceEvent e) {
                selection = text1.getSelection();
                e.doit = selection.x != selection.y;
            }

            @Override
            public void dragSetData(DragSourceEvent e) {
                e.data = text1.getText(selection.x, selection.y - 1);
            }

            @Override
            public void dragFinished(DragSourceEvent e) {
                if (e.detail == DND.DROP_MOVE) {
                    text1.replaceTextRange(selection.x, selection.y - selection.x, "");
                }
                selection = null;
            }
        });

        final StyledText text2 = new StyledText(shell, style);
        text2.setText(string2);
        DropTarget target = new DropTarget(text2, DND.DROP_DEFAULT | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK);
        target.setTransfer(TextTransfer.getInstance());
        target.addDropListener(new DropTargetAdapter() {
            @Override
            public void dragEnter(DropTargetEvent e) {
                if (e.detail == DND.DROP_DEFAULT)
                    e.detail = DND.DROP_COPY;
            }

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

            @Override
            public void drop(DropTargetEvent e) {
                text2.insert((String) e.data);
            }
        });
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}