import javax.swing.JFrame;

PImage img;
JFrame new_window;
MApplet imageviewer;

// the size the outer-frame takes (in windows 7.. not sure about other os)
int frameWidth = 16;
int frameHeight = 38;

void setup()
{
  background(0);
  stroke(255);
}

void draw()
{
  line(random(width),random(height),random(width),random(height));
}

void mousePressed()
{
  loadNewImage();
}

// I chose to just make my own filter-function, because of the bug on windowsmachines with FileDialog and FilenameFilter 
// see http://developer.java.sun.com/developer/bugParade/bugs/4031440.html for more info
// should use JFileChooser 
public boolean isImage(String name) {
  return (name.endsWith(".jpg") || 
    name.endsWith(".png") || 
    name.endsWith(".gif") || 
    name.endsWith(".jpeg"));
}

void loadNewImage()
{
  // pick image to display in a new window
  FileDialog fd = new FileDialog(this.frame,"Open image",FileDialog.LOAD);
  fd.setLocation(50, 50);
  fd.show();
  String dir = fd.getDirectory();
  String file = fd.getFile(); 
  fd.dispose();
  
  if( dir != null && file != null && isImage(file)){
    // load image
    img = loadImage(dir+file);

    // open the window / change the content
    if(new_window == null){
	new_window = new JFrame(file);
	// create the image viewer applet
	imageviewer = new MApplet();
	// add the image viewer applet
	new_window.getContentPane().add(imageviewer, BorderLayout.CENTER);
	// set it to not be resizable
	//new_window.setResizable(false);
	// show it
	new_window.setVisible(true);
	// init
	imageviewer.init();
    }
    // size it
    new_window.setSize(img.width + frameWidth, img.height + frameHeight);
  }
}

public class MApplet extends PApplet{
  public void setup()
  {
    background(255);
  }
  public void draw()
  {
    image(img,0,0);
  }
}