MenuDisableEnableClipBoard.java Source code

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Here is the source code for MenuDisableEnableClipBoard.java

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/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

/*
 * 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 org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.events.MenuAdapter;
import org.eclipse.swt.events.MenuEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class MenuDisableEnableClipBoard {

    public static void main(String[] args) {
        Display display = new Display();
        final Clipboard cb = new Clipboard(display);
        Shell shell = new Shell(display);
        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(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent 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(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                String string = (String) (cb.getContents(TextTransfer.getInstance()));
                if (string != null)
                    text.insert(string);
            }
        });
        menu.addMenuListener(new MenuAdapter() {
            public void menuShown(MenuEvent 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();
    }
}