/*******************************************************************************
 * Copyright (c) 2000, 2016 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
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Browser example snippet: query DOM node value (Eclipse/SWT 3.4 and earlier).
 * For an improved implementation of this snippet that can be used with Eclipse/SWT 3.5
 * and newer see
 * http://git.eclipse.org/c/platform/eclipse.platform.swt.git/tree/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet308.java
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.1
 */
import org.eclipse.swt.*;
import org.eclipse.swt.browser.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet160 {
	public static void main(String [] args) {
		final String html = "<html><title>Snippet</title><body><p id='myid'>Best Friends</p><p id='myid2'>Cat and Dog</p></body></html>";
		Display display = new Display();
		final Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		final Browser browser;
		try {
			browser = new Browser(shell, SWT.NONE);
		} catch (SWTError e) {
			System.out.println("Could not instantiate Browser: " + e.getMessage());
			return;
		}
		browser.addStatusTextListener(event -> browser.setData("query", event.text));
		browser.addProgressListener(new ProgressListener() {
			@Override
			public void changed(ProgressEvent event) {
			}
			@Override
			public void completed(ProgressEvent event) {
				/*
				 * Use JavaScript to query the desired node content through the Document Object Model
				 *
				 * Assign result to the window property status to pass the result to the StatusTextListener
				 * This trick is required since <code>execute</code> does not return the <code>String</code>
				 * directly.
				 */
				boolean result = browser.execute("window.status=document.getElementById('myid').childNodes[0].nodeValue;");
				if (!result) {
					/* Script may fail or may not be supported on certain platforms. */
					System.out.println("Script was not executed.");
					return;
				}
				String value = (String)browser.getData("query");
				System.out.println("Node value: "+value);
			}
		});
		/* Load an HTML document */
		browser.setText(html);
		shell.open();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}