/*******************************************************************************
 * Copyright (c) 2000, 2010 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.gef.examples.logicdesigner.edit;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;

import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.graphics.Image;

import org.eclipse.draw2d.ConnectionAnchor;
import org.eclipse.draw2d.IFigure;

import org.eclipse.gef.AccessibleAnchorProvider;
import org.eclipse.gef.AccessibleEditPart;
import org.eclipse.gef.EditPolicy;

import org.eclipse.gef.examples.logicdesigner.LogicMessages;
import org.eclipse.gef.examples.logicdesigner.figures.FigureFactory;
import org.eclipse.gef.examples.logicdesigner.figures.LEDFigure;
import org.eclipse.gef.examples.logicdesigner.model.LED;

/**
 * Holds the EditPart signifying an LED.
 */
public class LEDEditPart extends LogicEditPart {

	private static Image LED_SEL_PRIM_BG;
	private static Image LED_SEL_SECD_BG;

	private static Image createImage(String name) {
		InputStream stream = LEDFigure.class.getResourceAsStream(name);
		Image image = new Image(null, stream);
		try {
			stream.close();
		} catch (IOException ioe) {
		}
		return image;
	}

	protected AccessibleEditPart createAccessible() {
		return new AccessibleGraphicalEditPart() {

			public void getName(AccessibleEvent e) {
				e.result = LogicMessages.LogicPlugin_Tool_CreationTool_LED_Label;
			}

			public void getValue(AccessibleControlEvent e) {
				e.result = Integer.toString(getLEDModel().getValue());
			}

		};
	}

	protected void createEditPolicies() {
		super.createEditPolicies();
		installEditPolicy(EditPolicy.COMPONENT_ROLE, new LEDEditPolicy());
	}

	/**
	 * Returns a newly created Figure to represent this.
	 * 
	 * @return Figure of this.
	 */
	protected IFigure createFigure() {
		return FigureFactory.createNewLED();
	}

	public Object getAdapter(Class key) {
		if (key == AccessibleAnchorProvider.class)
			return new DefaultAccessibleAnchorProvider() {
				public List getSourceAnchorLocations() {
					List list = new ArrayList();
					Vector sourceAnchors = getNodeFigure()
							.getSourceConnectionAnchors();
					for (int i = 0; i < sourceAnchors.size(); i++) {
						ConnectionAnchor anchor = (ConnectionAnchor) sourceAnchors
								.get(i);
						list.add(anchor.getReferencePoint()
								.getTranslated(0, -3));
					}
					return list;
				}

				public List getTargetAnchorLocations() {
					List list = new ArrayList();
					Vector targetAnchors = getNodeFigure()
							.getTargetConnectionAnchors();
					for (int i = 0; i < targetAnchors.size(); i++) {
						ConnectionAnchor anchor = (ConnectionAnchor) targetAnchors
								.get(i);
						list.add(anchor.getReferencePoint().getTranslated(0, 3));
					}
					return list;
				}
			};
		return super.getAdapter(key);
	}

	protected Image getBackgroundImage(int state) {
		if (state == SELECTED_PRIMARY) {
			if (LED_SEL_PRIM_BG == null)
				LED_SEL_PRIM_BG = createImage("icons/ledbgprim.gif"); //$NON-NLS-1$
			return LED_SEL_PRIM_BG;
		}
		if (state == SELECTED) {
			if (LED_SEL_SECD_BG == null)
				LED_SEL_SECD_BG = createImage("icons/ledbgsel.gif"); //$NON-NLS-1$
			return LED_SEL_SECD_BG;
		}
		return null;
	}

	/**
	 * Returns the Figure of this as a LEDFigure.
	 * 
	 * @return LEDFigure of this.
	 */
	public LEDFigure getLEDFigure() {
		return (LEDFigure) getFigure();
	}

	/**
	 * Returns the model of this as a LED.
	 * 
	 * @return Model of this as an LED.
	 */
	protected LED getLEDModel() {
		return (LED) getModel();
	}

	public void propertyChange(java.beans.PropertyChangeEvent change) {
		if (change.getPropertyName().equals(LED.P_VALUE))
			refreshVisuals();
		else
			super.propertyChange(change);
	}

	/**
	 * Apart from the usual visual update, it also updates the numeric contents
	 * of the LED.
	 */
	public void refreshVisuals() {
		getLEDFigure().setValue(getLEDModel().getValue());
		super.refreshVisuals();
	}

	public void setSelected(int i) {
		super.setSelected(i);
		refreshVisuals();
	}

}
