CODEWITHSUNDEEP
javaswingobjectjpanel
Jesper Tuborg Madsen
Jesper Tuborg Madsen

Reputation: 91

Changing values instantiated objects

I'm trying to get my head around changing a Boolean in my glasspane:

public class Frame extends JFrame{
    setResizable(false);
    setVisible(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args) {
    Frame f = new Frame();
    MyGlassPane mgp = new MyGlassPane();
    f.setGlassPane(mgp);
    mgp.setVisible(true);
    mgp.setOpaque(false);
            Store s = new Store();
            f.add(s);
            f.pack();
}

public class MyGlassPane extends JPanel{
Boolean show;

    @Override
public void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.setColor(Color.black);
    if(show){
    g.fillRect(50, 50, 50, 50);
    }
}

public class Store extends JPanel{

public Store(){
    setLayout(null);
    But jb1 = new But();
        add(jb1);

    setBackground(Color.DARK_GRAY);

}

}

public class But extends JButton implements MouseListener, MouseMotionListener {
public But(){
        addMouseListener(this);
    addMouseMotionListener(this);

}
@Override
public void mouseClicked(MouseEvent e) {
//Here I should be able to "show = true", but can't figure out how? 
}

Any help is appreciated.

Tried creating a public void setShow(Boolean x){ show = x}; in the MyGlassPane class, but couldn't make it work. How can I change the value of the instanciated JPanel's boolean value, so that it draws my rectangle (this should happen when i click a button added to the "otherClass").

Upvotes: 0

Views: 122

Answers (1)

Thierry
Thierry

Reputation: 5233

You have to store a reference on the MyGlassPane objet (it can be static if it's a singleton) :

 public class But extends JButton implements MouseListener, MouseMotionListener {
    private MyGlassPane mgp;
    public But(MyGlassPane mgp){
        this.mgp = mgp;
    }
    public void mouseClicked(MouseEvent e) {
        mgp.show = true;
    }
 } 


 public Store(MyGlassPane mgp){
   //..
   But jb1 = new But(mgp);
   //..
 }

and finally in your main :

 public static void main(St ring[] args) {
     Frame f = new Frame(); 
     MyGlassPane mgp = new MyGlassPane();
     //..
     Store s = new Store(mgp);
     //..
 }

Of course, not a very graceful solution, but it should work...

Upvotes: 1

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