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?

score 2 · Accepted Answer · edited May 23 '17 at 12:21

"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);
    }
}

Not using multiple frames... 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... This isnt the solution :P — Alpha2k, Apr 11 '14 at 08:15
Can you provide some sample code to illustrate the problem in more detail — Paul Samsotha, Apr 11 '14 at 08:17
This is the entire project http://www.mediafire.com/download/559r2joiqmc752n/TransferenciaBancaria.7z check out the class Fecha, there is a comment — Alpha2k, Apr 11 '14 at 08:25
See my **UPDATE** I think you are looking for something more like that. Look at the link in the beginning of the question to see how to edit the code in the `initComponents()` — Paul Samsotha, Apr 11 '14 at 08:25
1- I'd be carful suggested that people can edit the protected blocks of the form generating, as it may be regenerated the next time the form is opened. 2- I'd also be careful about exposing UI components via getters, this leaves the open to modifications which may not want (including the ability of code to remove the,), personally, I'd use a property setter instead — MadProgrammer, Apr 11 '14 at 09:45

score 0 · Answer 2 · answered Apr 11 '14 at 07:53

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.

NetBeans Matisse - Access jframe component from another class

2 Answers2