org.eclipse.swt.snippets.Snippet282.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet282.java

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/*******************************************************************************
 * Copyright (c) 2016 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;

/*
 * Copy/paste image to/from clipboard.
 *
 * 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.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet282 {

    public static void main(String[] args) {
        final Display display = new Display();
        final Clipboard clipboard = new Clipboard(display);
        final Shell shell = new Shell(display, SWT.SHELL_TRIM);
        shell.setText("Snippet 282");
        shell.setLayout(new GridLayout());
        shell.setText("Clipboard ImageTransfer");

        final Button imageButton = new Button(shell, SWT.NONE);
        GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
        gd.minimumHeight = 400;
        gd.minimumWidth = 600;
        imageButton.setLayoutData(gd);

        final Text imageText = new Text(shell, SWT.BORDER);
        imageText.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));

        Composite buttons = new Composite(shell, SWT.NONE);
        buttons.setLayout(new GridLayout(4, true));
        Button button = new Button(buttons, SWT.PUSH);
        button.setText("Open");
        button.addListener(SWT.Selection, event -> {
            FileDialog dialog = new FileDialog(shell, SWT.OPEN);
            dialog.setText("Open an image file or cancel");
            String string = dialog.open();
            if (string != null) {
                imageButton.setText("");
                Image image = imageButton.getImage();
                if (image != null)
                    image.dispose();
                image = new Image(display, string);
                imageButton.setImage(image);
                imageText.setText(string);
            }
        });

        button = new Button(buttons, SWT.PUSH);
        button.setText("Copy");
        button.addListener(SWT.Selection, event -> {
            Image image = imageButton.getImage();
            if (image != null) {
                ImageTransfer imageTransfer = ImageTransfer.getInstance();
                TextTransfer textTransfer = TextTransfer.getInstance();
                clipboard.setContents(new Object[] { image.getImageData(), imageText.getText() },
                        new Transfer[] { imageTransfer, textTransfer });
            }
        });

        button = new Button(buttons, SWT.PUSH);
        button.setText("Paste");
        button.addListener(SWT.Selection, event -> {
            ImageData imageData = (ImageData) clipboard.getContents(ImageTransfer.getInstance());
            if (imageData != null) {
                imageButton.setText("");
                Image image = imageButton.getImage();
                if (image != null)
                    image.dispose();
                image = new Image(display, imageData);
                imageButton.setImage(image);
            } else {
                imageButton.setText("No image");
                imageButton.setImage(null);
            }
            String text = (String) clipboard.getContents(TextTransfer.getInstance());
            if (text != null) {
                imageText.setText(text);
            } else {
                imageText.setText("");
            }
        });

        button = new Button(buttons, SWT.PUSH);
        button.setText("Clear");
        button.addListener(SWT.Selection, event -> {
            imageButton.setText("");
            Image image = imageButton.getImage();
            if (image != null)
                image.dispose();
            imageButton.setImage(null);
            imageText.setText("");
        });

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