/*

 * Copyright (c) 2005 Matthew Hall 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:

 *     Matthew Hall - initial API and implementation

 */

package net.sf.paperclips.ui;



import net.sf.paperclips.PrintPiece;



import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.widgets.Canvas;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Event;

import org.eclipse.swt.widgets.Listener;



/**

 * A canvas for displaying Print objects.

 * 

 * @author Matthew

 */

public class PrintPieceCanvas extends Canvas {

	PrintPiece piece = null;



	/**

	 * Constructs a PrintCanvas with the given parent and style.

	 * 

	 * @param parent

	 *            the parent Composite.

	 * @param style

	 *            the style parameter.

	 */

	public PrintPieceCanvas(Composite parent, int style) {

		super(parent, style);



		setBackground(getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));

		setForeground(getDisplay().getSystemColor(SWT.COLOR_LIST_FOREGROUND));



		addListener(SWT.Paint, new Listener() {

			public void handleEvent(Event event) {

				if (piece == null)

					return;



				Rectangle client = getClientArea();

				piece.paint(event.gc, client.x, client.y);

			}

		});

		addListener(SWT.Dispose, new Listener() {

			public void handleEvent(Event event) {

				disposePrintPiece();

			}

		});

	}



	/**

	 * Displays the given Print in this PrintCanvas.

	 * 

	 * @param piece

	 *            the PrintPiece to display.

	 */

	public void setPrintPiece(PrintPiece piece) {

		disposePrintPiece();

		this.piece = piece;

		redraw();

	}



	/**

	 * Returns the PrintPiece being displayed by this PrintCanvas.

	 * 

	 * @return the PrintPiece being displayed by this PrintCanvas.

	 */

	public PrintPiece getPrintPiece() {

		return piece;

	}



	private void disposePrintPiece() {

		if (piece != null)

			piece.dispose();

	}

}