examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet268.java

/*******************************************************************************
 * Copyright (c) 2000, 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;

/*
 * UI Automation (for testing tools) snippet: post mouse wheel events to a styled text
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.0
 */
import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet268 {

public static void main(String[] args) {
	final Display display = new Display();
	Shell shell = new Shell(display);
	shell.setText("Snippet 268");
	shell.setLayout(new FillLayout());
	StyledText styledText = new StyledText(shell, SWT.V_SCROLL);
	String multiLineString = "";
	for (int i = 0; i < 200; i++) {
		multiLineString = multiLineString.concat("This is line number " + i + " in the multi-line string.\n");
	}
	styledText.setText(multiLineString);
	shell.setSize(styledText.computeSize(SWT.DEFAULT, 400));
	shell.open();
	// move cursor over styled text
	Rectangle clientArea = shell.getClientArea();
	Point location = shell.getLocation();
	Event event = new Event();
	event.type = SWT.MouseMove;
	event.x = location.x + clientArea.width / 2;
	event.y = location.y + clientArea.height / 2;
	display.post(event);
	styledText.addListener(SWT.MouseWheel, e -> System.out.println("Mouse Wheel event " + e));
	new Thread(){
		Event event;
		@Override
		public void run() {
			for (int i = 0; i < 50; i++) {
				event = new Event();
				event.type = SWT.MouseWheel;
				event.detail = SWT.SCROLL_LINE;
				event.count = -2;
				if (!display.isDisposed()) display.post(event);
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {}
			}
		}
	}.start();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch()) display.sleep();
	}
	display.dispose();
}
}