/*******************************************************************************
 * Copyright (c) 2000, 2006 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
 * D Port:
 *     Bill Baxter <wbaxter@gmail.com>
 *******************************************************************************/
module dwtsnippets.tree.Snippet220;

/* 
 * Tree example snippet: Images on the right side of the TreeItem
 *
 * For a detailed explanation of this snippet see
 * http://www.eclipse.org/articles/Article-CustomDrawingTableAndTreeItems/customDraw.htm#_example5
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.2
 */

import dwt.DWT;
import dwt.graphics.Image;
import dwt.graphics.GC;
import dwt.widgets.Display;
import dwt.widgets.Shell;
import dwt.widgets.Listener;
import dwt.widgets.Event;
import dwt.widgets.Tree;
import dwt.widgets.TreeItem;

import tango.util.Convert;

import tango.io.Stdout;

void main() {
	Display display = new Display();
	Shell shell = new Shell(display);
	shell.setBounds(10, 10, 350, 200);
	Image xImage = new Image (display, 16, 16);
	GC gc = new GC(xImage);
	gc.setForeground(display.getSystemColor(DWT.COLOR_RED));
	gc.drawLine(1, 1, 14, 14);
	gc.drawLine(1, 14, 14, 1);
	gc.drawOval(2, 2, 11, 11);
	gc.dispose();
	const int IMAGE_MARGIN = 2;
	final Tree tree = new Tree(shell, DWT.CHECK);
	tree.setBounds(10, 10, 300, 150);
	TreeItem item = new TreeItem(tree, DWT.NONE);
	item.setText("root item");
	for (int i = 0; i < 4; i++) {
		TreeItem newItem = new TreeItem(item, DWT.NONE);
		newItem.setText("descendent " ~ to!(char[])(i));
		if (i % 2 == 0) newItem.setData(xImage);
		item.setExpanded(true);
		item = newItem;
	}

	/*
	 * NOTE: MeasureItem and PaintItem are called repeatedly.  Therefore it is
	 * critical for performance that these methods be as efficient as possible.
	 */
	tree.addListener(DWT.MeasureItem, new class Listener {
		public void handleEvent(Event event) {
            Stdout("measure").newline;
			TreeItem item = cast(TreeItem)event.item;
			Image trailingImage = cast(Image)item.getData();
			if (trailingImage !is null) {
                Stdout(" - measure image").newline;
				event.width += trailingImage.getBounds().width + IMAGE_MARGIN;
			}
		}
	});
	tree.addListener(DWT.PaintItem, new class Listener {
		public void handleEvent(Event event) {
            Stdout("paint").newline;
			TreeItem item = cast(TreeItem)event.item;
			Image trailingImage = cast(Image)item.getData();
			if (trailingImage !is null) {
                Stdout(" - draw image").newline;
				int x = event.x + event.width + IMAGE_MARGIN;
				int itemHeight = tree.getItemHeight();
				int imageHeight = trailingImage.getBounds().height;
				int y = event.y + (itemHeight - imageHeight) / 2;
				event.gc.drawImage(trailingImage, x, y);
			}
		}
	});

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