Article-CustomDrawingTableAndTreeItems/snippets/example3.txt

/*******************************************************************************
 * Copyright (c) 2000, 2007 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;

/*
 * Table snippet: custom draw a Table's selection rectangle as a gradient
 * 
 * For a detailed explanation of this snippet see
 * http://www.eclipse.org/articles/Article-CustomDrawingTableAndTreeItems/customDraw.htm#_example3
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.2
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Example3 {

public static void main(String[] args) {
	Display display = new Display(); 
	Shell shell = new Shell(display);
	final Color red = display.getSystemColor(SWT.COLOR_RED);
	final Color yellow = display.getSystemColor(SWT.COLOR_YELLOW);
	final Table table = new Table(shell, SWT.FULL_SELECTION);
	table.setHeaderVisible(true);
	new TableColumn(table, SWT.NONE).setWidth(100);
	new TableColumn(table, SWT.NONE).setWidth(100);
	new TableColumn(table, SWT.NONE).setWidth(100);
	for (int i = 0; i < 5; i++) {
		TableItem item = new TableItem(table, SWT.NONE);
		item.setText(0, "item " + i + " col 0");
		item.setText(1, "item " + i + " col 1");
		item.setText(2, "item " + i + " col 2");
	}
	table.pack();

	/*
	 * NOTE: EraseItem is called repeatedly.  Therefore it is critical
	 * for performance that this method be as efficient as possible.
	 */
	table.addListener(SWT.EraseItem, new Listener() {
		public void handleEvent(Event event) {
			event.detail &= ~SWT.HOT;
			if ((event.detail & SWT.SELECTED) == 0) return; /* item not selected */
			int clientWidth = table.getClientArea().width;
			GC gc = event.gc;
			Color oldForeground = gc.getForeground();
			Color oldBackground = gc.getBackground();
			gc.setForeground(red);
			gc.setBackground(yellow);
			gc.fillGradientRectangle(0, event.y, clientWidth, event.height, false);
			gc.setForeground(oldForeground);
			gc.setBackground(oldBackground);
			event.detail &= ~SWT.SELECTED;
		}
	});

	shell.pack();
	shell.open();
	while (!shell.isDisposed()) {
		if (!display.readAndDispatch()) display.sleep();
	}
	display.dispose();
}
}