NetBeans Matisse - Access jframe component from another class

Question

The Matisse code from Netbeans is blocked. The problem I have is that I have to setBackground to a JLabel from another Class in different package but I cannot do this because i have no access to the JLabel due to its private and blocked code.

Is thare any solution to this?

Answer 1

"The Matisse code from Netbeans is blocked"

You can edit it as seen here

"because i have no access to the JLabel due to its private and blocked code"

Just write a getter method for the label in the other class

public class OtherClass .. {
    private JLabel jLabel1;

    public JLabel getLabel() {
        return jLabel1;
    }
}

import otherpackage.OtherClass;

public class MainFrame extends JFrame {
    private OtherClass otherClass;
    ...
    private void jButtonActionPerformed(ActionEvent e) {
         JLabel label = otherClass.getLabel();
         label.setBackground(...)
    }
}

---

"Access jframe component from another class"

Sounds like you're using multiple frames. See The Use of Multiple JFrames, Good/Bad Practice?

---

UPDATE

" I have a MAIN frame made in matisse but due to some reasons i have to set the background of an textField inside matisse from another class when X validation happens in the other class"

What you can do then is pass a reference of the Main frame to the other class, and have a setter in the Main frame. Something like (I will provide an interface for access)

public interface Gettable {
    public void setLabelBackground(Color color);
}

public class Main extends JFrame implements Gettable {
    private JLabel jLabel1;
    private OtherPanel otherPanel;

    public void initComponents() {
        otherPanel = new OtherPanel(Main.this); // see link above to edit this area
    }

    @Override
    public void setLabelBackground(Color color) {
        jLabel1.setBackground(color);
    }
}

public class OtherPanel extends JPanel {
    private Gettable gettable;

    public OtherPanel(Gettable gettable) {
        this.gettable = gettable;
    }

    private void jButtonActionPerformed(ActionEvent e) {
        gettable.setLabelBackground(Color.RED);
    }
}

Answer 2

• Create a listener for the class with JLabel with method for changing background of label
• Implement it in the class where JLabel is used
• Set listener of other class ( from which you want to change the BG ) to be the listener of class with JLabel
• Change Background after whatever function you want.