CODEWITHSUNDEEP
javaswingpaintcomponentjcomponent
WearFox
WearFox

Reputation: 293

make a JComponent opaque

I'm trying to make a JComponent opaque in the right border.

I want make a object with my specific characteristics so i'm using a JComponent that can be opaque

this is because I will make a library, and I don't want to use JPanel or JLabel

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.image.BufferedImage;
import java.util.ArrayList;

public class ProbadorCodigos {

    JFrame Frame=new JFrame();
    JComponent BORDEDE=new JComponent() {private static final long serialVersionUID = 2222L;};

    public ProbadorCodigos() {

        Frame.setSize(500, 500);
        Frame.setResizable(false);
        Frame.setUndecorated(false);
        Frame.setLayout(null);
        Frame.setLocationRelativeTo(null);
        Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Frame.getContentPane().setBackground(Color.darkGray);
        Format();
        Action();
    }


    private void Format() {

        BORDEDE.setBounds(Frame.getWidth()-100, 0, 100, Frame.getHeight());
        BORDEDE.setOpaque(true);
        BORDEDE.setVisible(true);
        BORDEDE.setEnabled(true);
        BORDEDE.setFocusable(true);
        BORDEDE.setBackground(Color.red);
        System.out.println(BORDEDE);
    }
    private void Action() {


        Frame.add(BORDEDE);
    }    

    public static void main(String[] args) {


        ProbadorCodigos Ventana=new ProbadorCodigos();
        Ventana.Frame.setVisible(true);
    }

}

noo

I don't know why it don't shows opaque, if I use a JLabel works so what I missing?

thanks for your advices and answers

Upvotes: 0

Views: 393

Answers (1)

Hovercraft Full Of Eels
Hovercraft Full Of Eels

Reputation: 285405

My suggestion for general ease of solving your problem: use a JPanel. Until you show good reason for not using this as the basis for your class, it remains in my mind the best solution for your problem. Otherwise, you'll need some code like:

JComponent bordede = new JComponent() {
  private static final long serialVersionUID = 2222L;

  @Override
  protected void paintComponent(Graphics g) {
     super.paintComponent(g);
     int width = getWidth();
     int height = getHeight();
     g.setColor(getBackground());
     g.fillRect(0, 0, width, height);
  }
};

Which again is not necessary if you simply used a JPanel.

Other problems with your code:

  • Your code does not comply with Java naming conventions and so will confuse other Java programmers.
  • You are using a null layout and setBounds(...) which will result in the creation of a rigid hard to enhance and debug GUI. You should avoid using this type of layout.

Upvotes: 2

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