SwitchPanel.java

/*******************************************************************************
 * Copyright (c) 2003-2005, 2013 Till Zoppke.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Till Zoppke - initial API and implementation
 ******************************************************************************/
/*
 * Created on 21.03.2004
 */
package eniac.data.view.sw;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Rectangle;

import eniac.data.model.sw.Switch;
import eniac.data.view.EPanel;
import eniac.skin.Descriptor;

/**
 * @author zoppke
 */
public class SwitchPanel extends EPanel {

	// the old value before the mouse was pressed.
	// This will be used to restore the value in case the mouse will be
	// released outside the component.
	protected int _oldValue = 0;

	// indicates whether the left mouse button is currently down.
	// This is useful to determine if one is dragging with right or left button.
	protected boolean _leftDown = false;

	// ============================== lifecycle
	// =================================

	public SwitchPanel() {
		// empty
	}

	// =============================== methods
	// ==================================

	protected void paintComponent(Graphics g, int x, int y, int width, int height, int lod) {

		// get descriptor. If no descriptor, just return.
		Descriptor descriptor = getDescriptor(lod);
		if (descriptor == null) {
			return;
		}

		// helper variables
		Image img;
		Image[] images;
		Switch sw = (Switch) _data;
		int value = sw.getValue();

		// get array of background images, if defined
		images = (Image[]) descriptor.get(Descriptor.Key.BACK_IMAGE_ARRAY);
		if (images == null) {
			// if no array defined, look for a single background image
			img = (Image) descriptor.get(Descriptor.Key.BACK_IMAGE);
		}
		else {
			// otherwise take image according to value
			img = images[value];
		}

		if (img == null) {
			// if no image, draw background
			drawBackground(g, x, y, width, height, lod, descriptor);
		}
		else {
			// paint background image.
			g.drawImage(img, x, y, width, height, this);
		}

		// check, if we have power to paint the foreground
		if (sw.hasPower()) {

			// get array of foreground images, if defined
			images = (Image[]) descriptor.get(Descriptor.Key.FORE_IMAGE_ARRAY);
			if (images == null) {
				// if no array defined, look for a single foreground image
				img = (Image) descriptor.get(Descriptor.Key.FORE_IMAGE);
			}
			else {
				// otherwise take image according to value
				img = images[value];
			}

			// paint image, if defined
			if (img != null) {

				// define variables
				Rectangle rect = null;
				Rectangle[] rectangles;

				// get array of rectangles, if defined
				rectangles = (Rectangle[]) descriptor.get(Descriptor.Key.RECTANGLE_ARRAY);
				if (rectangles == null) {
					// if no array defined, look for a single rectangle
					rect = (Rectangle) descriptor.get(Descriptor.Key.RECTANGLE);
				}
				else {
					// otherwise take image according to value
					rect = rectangles[value];
				}

				// if a rectangle found, scale bounds
				if (rect != null) {
					x += rect.x * width / descriptor.getWidth();
					y += rect.y * height / descriptor.getHeight();
					width = width * rect.width / descriptor.getWidth();
					height = height * rect.height / descriptor.getHeight();
				}

				// draw foreground image
				g.drawImage(img, x, y, width, height, this);
			}
		}
	}

	public boolean isEnabled() {
		return ((Switch) _data).isEnabled() && super.isEnabled();
	}

	/**
	 * Sets the new value to the related IValue-Object. If the new value is -1,
	 * the value is set back to the old value. A value of -1 indicates that the
	 * mouse-cursor was released outside this component.
	 */
	protected void setValue(int value) {
		if (value == -1) {
			((Switch) _data).setValue(_oldValue);
		}
		else {
			((Switch) _data).setValue(value);
		}
	}
}