Programming Languages Suite/ProgLangD.iso/VCAFE.3.0A/Main.bin/ImageIcon.java

Java Source | 1998-10-03 | 4.6 KB | 214 lines

package com.symantec.itools.swing.icons;

import java.awt.*;
import java.awt.image.*;
import java.net.URL;
import com.sun.java.swing.*;
import java.io.Serializable;
import java.io.InputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;

public class ImageIcon
    implements Icon, java.io.Serializable
{
    /**
     * Creates an uninitialized image icon.
     */
    public ImageIcon()
    {
    }

    /**
     * Creates an image icon from the specified URL. The image will
     * be preloaded by using MediaTracker to monitor the loaded state
     * of the image.
     */
    public ImageIcon (URL location)
    {
        imageLocation = location;
        image = Toolkit.getDefaultToolkit().getImage(location);
        loadImage(image);
    }

    /**
     * Creates an image icon from the specified Image. The image will
     * be preloaded by using MediaTracker to monitor the loaded state
     * of the image.
     */
    public ImageIcon (Image i)
    {
        image = i;
        loadImage(image);
    }

    /**
     * Creates an image icon from the specified InputStream. The image will
     * be preloaded by using MediaTracker to monitor the loaded state
     * of the image.  The InputStream is closed when the read is done.
     */
    public ImageIcon (InputStream inStream)
        throws IOException
    {
        int                   numRead;
        byte[]                bytes;
        ByteArrayOutputStream outStream;

        bytes     = new byte[1024];
        outStream = new ByteArrayOutputStream();

        while((numRead = inStream.read(bytes)) > 0)
        {
            outStream.write(bytes, 0, numRead);
        }

        inStream.close();
        outStream.flush();

        image = Toolkit.getDefaultToolkit().createImage(outStream.toByteArray());
        loadImage(image);
        outStream.close();
    }

    //
    // Properties
    //

    /**
     * Returns the location of the Image displayed by this icon.
     */
    public URL getImageLocation ()
    {
        return imageLocation;
    }

    /**
     * Set the location to displayed by this icon. The image will
     * be preloaded by using MediaTracker to monitor the loading state
     * of the image.
     */
    public void setImageLocation (URL location)
    {
        imageLocation = location;
        image = Toolkit.getDefaultToolkit().getImage(location);
        loadImage(image);
    }

    /**
     * Set the image observer for the image.  Set this
     * property if the ImageIcon contains an animated GIF.
     * For example:
     * <pre>
     *     icon = new ImageIcon(...)
     *     button.setImageLocation(URL);
     *     icon.setImageObserver(button);
     * </pre>
     */
    public void setImageObserver(ImageObserver observer)
    {
        imageObserver = observer;
    }

    /**
     *  Return the image observer for the image
     */
    public ImageObserver getImageObserver()
    {
        return imageObserver;
    }

    //
    // Icon interface implementation
    //

    /**
     * Paints the Icon
     */
    public synchronized void paintIcon(Component c, Graphics g, int x, int y)
    {
        if (image != null)
            if (imageObserver == null)
                g.drawImage(image, x, y, c);
            else
                g.drawImage(image, x, y, imageObserver);
    }

    /**
     * Get the width of the Icon
     */
    public int getIconWidth()
    {
        return width;
    }

    /**
     * Get the height of the Icon
     */
    public int getIconHeight()
    {
        return height;
    }

    //
    // Implementation
    //

    /**
     * Wait for the image to load
     */
    protected void loadImage(Image image)
    {
        synchronized(tracker)
        {
            tracker.addImage(image, 0);

            try
            {
                tracker.waitForID(0, 5000);
            }
            catch (InterruptedException e)
            {
                System.out.println("INTERRUPTED while loading Image");
            }

            loadStatus = tracker.statusID(0, false);

            tracker.removeImage(image, 0);

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

    /**
     * Returns the status of the image loading operation.
     * @return the loading status as defined by java.awt.MediaTracker.
     * @see java.awt.MediaTracker#ABORTED
     * @see java.awt.MediaTracker#ERRORED
     * @see java.awt.MediaTracker#COMPLETE
     */
    public int getImageLoadStatus()
    {
        return loadStatus;
    }

    public Image getImage()
    {
        return image;
    }

    protected transient Image image;
    protected transient int loadStatus = 0;
    protected ImageObserver imageObserver;
    protected URL imageLocation = null;

    protected final static Component component = new Component() {};
    protected final static MediaTracker tracker = new MediaTracker(component);

    protected int width = -1;
    protected int height = -1;
}