CODEWITHSUNDEEP
javaswingtransparency
ATH
ATH

Reputation: 43

Painting a transparent object on another transparent object

I place a semi-transparent JCheckBox object on a semi-transparent JPanel. When I move the mouse cursor over the JCheckBox object, it repaints the JCheckBox object on top of the original JCheckBox object a few cells displaced from the original JCheckBox object.

What I want it to do is to look exactly the same after I move my mouse cursor over it.

Before (the mouse cursor is NOT on the JCheckBox object):

http://i.imgur.com/J6zZwuD.png

After (the mouse cursor is on the JCheckBox object):

http://i.imgur.com/Wygqq4o.png

Code:

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

class TransparentPanel extends JPanel{
    public TransparentPanel(){
        super();
        setOpaque(false);
        setBackground(new Color(0, 0, 0, 100));

        JCheckBox checkBox=new JCheckBox("Check Box"){
            protected void paintComponent(Graphics g){
                g.setColor(getBackground());
                g.fillRect(0, 0, getWidth(), getHeight());
                super.paintComponent(g);
            }
        };
        checkBox.setFocusable(false);
        checkBox.setOpaque(false);
        checkBox.setBackground(new Color(200, 200, 200, 50));
        add(checkBox);
    }
    @Override
    protected void paintComponent(Graphics g){
        g.setColor(getBackground());
        g.fillRect(0, 0, getWidth(), getHeight());
        super.paintComponent(g);
    }
    public static void main(String[] args){
        JFrame frame=new JFrame();
        frame.setSize(200, 100);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TransparentPanel());
        frame.setVisible(true);
    }
}

Sorry if this was already asked. I looked all over and I couldn't find someone with the same problem. And sorry again if this post isn't a legitimate SSCCE. It's my first post here.

EDIT 1: Edited the code. The problem still exists.

EDIT 2: The code now works.

Upvotes: 0

Views: 194

Answers (1)

camickr
camickr

Reputation: 324147

See Backgrounds With Transparency for an explanation on how painting works and maybe a solution you can use.

In this case I would guess you would need to add both TransparentPanel and the checkBox to a separate AlphaContainer.

Upvotes: 2

Related Questions