design/designer-base/src/main/java/com/fr/design/icon/WarningIcon.java

package com.fr.design.icon;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.image.ImageObserver;

import javax.swing.GrayFilter;
import javax.swing.ImageIcon;

import com.fr.base.BaseUtils;
import com.fr.base.FRContext;

/**
 * 警告图片
 * 
 * @author zhou
 * @since 2012-3-28下午10:20:29
 */
public class WarningIcon extends ImageIcon {
	protected final static Component component = new Component() {
	};
	protected final static MediaTracker tracker = new MediaTracker(component);
	private final static Image warnighImage = BaseUtils.readImage("/com/fr/design/images/gui/warning.png");

	private Image mainImage = null;
	private ImageObserver imageObserver;
	private int width = -1;
	private int height = -1;

	public WarningIcon(Image mainImage) {
		this.mainImage = mainImage;

		if (this.mainImage != null) {
			loadImage(this.mainImage);
		}
	}

	@Override
	public void paintIcon(Component c, Graphics g, int x, int y) {
		if (mainImage != null) {
			g.drawImage(mainImage, x, y, c);
		}
		if (warnighImage != null) {
			g.drawImage(warnighImage, x, y, c);
		}
	}

	/**
	 * Loads the image, returning only when the image is loaded.
	 * 
	 * @param image
	 *            the image
	 */
	protected void loadImage(Image image) {
		synchronized (tracker) {
			tracker.addImage(image, 0);
			try {
				tracker.waitForID(0, 0);
			} catch (InterruptedException e) {
				FRContext.getLogger().error(e.getMessage(), e);
			}

			tracker.statusID(0, false);
			tracker.removeImage(image, 0);

			width = image.getWidth(imageObserver);
			height = image.getHeight(imageObserver);
		}
	}

	/**
	 * Returns this icon's <code>Image</code>.
	 * 
	 * @return the <code>Image</code> object for this <code>ImageIcon</code>
	 */
	public Image getImage() {
		return mainImage;
	}

	public LockIcon getDisabledLockIcon() {
		Image mainDisabledImage = GrayFilter.createDisabledImage(mainImage);

		return new LockIcon(mainDisabledImage);
	}

	/**
	 * Gets the width of the icon.
	 * 
	 * @return the width in pixels of this icon
	 */
	public int getIconWidth() {
		return width;
	}

	/**
	 * Gets the height of the icon.
	 * 
	 * @return the height in pixels of this icon
	 */
	public int getIconHeight() {
		return height;
	}

	{
		loadImage(warnighImage);
	}
}