org.eclipse.swt.snippets.Snippet326.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet326.java
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/*******************************************************************************
 * Copyright (c) 2009, 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;

/*
 * Browser example snippet: Close a Browser such that it can be
 * cancelled by an onbeforeunload handler.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.6
 */
import org.eclipse.swt.*;
import org.eclipse.swt.browser.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet326 {
    static final String HTML = "<html><head><script>" + "function doit() {"
            + "  return 'The box may contain some unsaved text.';" + "}" + "window.onbeforeunload = doit;"
            + "</script></head><body><textarea rows=\"5\" cols=\"22\">some text</textarea></body></html>";

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 326");
        shell.setLayout(new GridLayout());

        final Browser browser;
        try {
            browser = new Browser(shell, SWT.NONE);
        } catch (SWTError e) {
            System.out.println("Could not instantiate Browser: " + e.getMessage());
            display.dispose();
            return;
        }
        browser.setLayoutData(new GridData(400, 400));
        browser.setText(HTML);

        final Button button = new Button(shell, SWT.PUSH);
        button.setText("Invoke Browser.close()");
        button.addListener(SWT.Selection, event -> {
            boolean result = browser.close();
            System.out.println("was Browser disposed: " + result);
            if (result) {
                button.setEnabled(false);
            }
        });
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

}