/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.internal.discovery.ui.editor;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.PaintEvent;

import org.eclipse.swt.events.PaintListener;

import org.eclipse.swt.graphics.GC;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.widgets.Canvas;

import org.eclipse.swt.widgets.Composite;

class SharedBackgroundComposite extends Canvas {

	private final Composite backgroundParent;

	public SharedBackgroundComposite(Composite parent, Composite backgroundParent) {

		super(parent, SWT.NO_BACKGROUND);

		this.backgroundParent = backgroundParent;

		addPaintListener(new PaintListener() {

			@Override

			public void paintControl(PaintEvent e) {

				Rectangle b = getBounds();

				drawBackground(e.gc, b.x, b.y, b.width, b.height);

			}

		});

	}

	@Override

	public void drawBackground(GC gc, int x, int y, int width, int height) {

		Composite relParent = getParent();

		while (relParent != backgroundParent) {

			Rectangle relB = relParent.getBounds();

			x += relB.x;

			y += relB.y;

			relParent = relParent.getParent();

		}

		Image image = backgroundParent.getBackgroundImage();

		Rectangle imageBounds = image.getBounds();

		width = Math.min(width, imageBounds.width - x);

		height = Math.min(height, imageBounds.height - y);

		if (width > 0 && height > 0)

			gc.drawImage(image, x, y, width, height, 0, 0, width, height);

//		gc.setForeground(gc.getDevice().getSystemColor(SWT.COLOR_WHITE));

//		gc.drawRectangle(1, 1, width - 2, height - 2);

	}

}