Listener, Component, Interface

[Mike Cole]

Hi all,

first question is it acceptable to have more than one mouseListener?

2nd.:

Iam trying to prog. a simple game. In the game there are items.(a abstract class called Item). Item is really just the idea of an item, from it i subclass all the real items. -> spoon, screwdriver, flask and so on.
Now i want to make them "selectable", that means, if i move my mouse over an item it should change the graphics(like a button). The graphical representation of such an item is stored in a Class called Sprite. Which itself contains the images and some extra data. Now i found out that there is a class called Component and some interfaces called Accesible*.
My first idea was to subclass my Item class from Component and then add a mouse-listener to it, that way i thought i could find out when an object should be selected. The problem now is... i allready have a mouse-listener which does check other things...and/but only this one works.
So for my 2nd Question... is it a good idea to make my Item a subclass of Component? Or should i write something completly new? In a Component there are so many functions, i dont belive that i ever gonna need half of them.
Do i need any "accesible"-interfaces to reach my goal?(Iam confused by the amount of classes and interfaces java offers). Should i use JComponent or normal Component? Does that idea work? I wish to keep the Item class and Sprite class strictly seperated. (btw. Sprite contains BufferedImage which is drawn onto a Canvas, i hope that doesen�t destroy the idea of components)

Thank you very, very much!

[marc weber]

I think this topic would do better in the Swing forum. I'll move this there for you.

[Michael Dunn]

> i allready have a mouse-listener which does check other things...and/but
> only this one works.

you can add two, and they'll both work

    
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class Testing
{
  public void buildGUI()
  {
    JFrame f = new JFrame();
    JPanel p = new JPanel();
    p.setPreferredSize(new Dimension(100,100));
    f.getContentPane().add(p);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
    p.addMouseListener(new MouseAdapter(){
      public void mousePressed(MouseEvent me){
        System.out.println("Mouse Listener #1");
      }
    });
    p.addMouseListener(new MouseAdapter(){
      public void mousePressed(MouseEvent me){
        System.out.println("Mouse Listener #2");
      }
    });
  }
  public static void main(String args[]){new Testing().buildGUI();}
}

might be better if you can post a sample program (like the above),
that demonstrates the problem you have.


this article might give you some insight into Component vs JComponent
http://java.sun.com/products/jfc/tsc/articles/mixing/

and would specifically apply if you use swing components, and 'Canvas' here
> Sprite contains BufferedImage which is drawn onto a Canvas
is a java.awt.Canvas

if so, you can generally use a JPanel and it's paintComponent(), to
simulate a Canvas