org.eclipse.swt.snippets.Snippet122.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet122.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
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 502845
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Clipboard example snippet: enable/disable menu depending on clipboard content availability
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.0
 */

import static org.eclipse.swt.events.SelectionListener.*;

import org.eclipse.swt.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet122 {

    public static void main(String[] args) {
        Display display = new Display();
        final Clipboard cb = new Clipboard(display);
        Shell shell = new Shell(display);
        shell.setText("Snippet 122");
        shell.setLayout(new FillLayout());
        final Text text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP);
        Menu menu = new Menu(shell, SWT.POP_UP);
        final MenuItem copyItem = new MenuItem(menu, SWT.PUSH);
        copyItem.setText("Copy");
        copyItem.addSelectionListener(widgetSelectedAdapter(e -> {
            String selection = text.getSelectionText();
            if (selection.length() == 0) {
                return;
            }
            Object[] data = new Object[] { selection };
            Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
            cb.setContents(data, types);
        }));

        final MenuItem pasteItem = new MenuItem(menu, SWT.PUSH);
        pasteItem.setText("Paste");
        pasteItem.addSelectionListener(widgetSelectedAdapter(e -> {
            String string = (String) (cb.getContents(TextTransfer.getInstance()));
            if (string != null) {
                text.insert(string);
            }
        }));
        menu.addMenuListener(MenuListener.menuShownAdapter(e -> {
            // is copy valid?
            String selection = text.getSelectionText();
            copyItem.setEnabled(selection.length() > 0);
            // is paste valid?
            TransferData[] available = cb.getAvailableTypes();
            boolean enabled = false;
            for (int i = 0; i < available.length; i++) {
                if (TextTransfer.getInstance().isSupportedType(available[i])) {
                    enabled = true;
                    break;
                }
            }
            pasteItem.setEnabled(enabled);
        }));
        text.setMenu(menu);

        shell.setSize(200, 200);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        cb.dispose();
        display.dispose();
    }
}