Re: JTextField.paintComponent

From:
Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 21 May 2009 20:21:44 -0700
Message-ID:
<4a161a48$0$4154$b9f67a60@news.newsdemon.com>
Aaron Fude wrote:

Hi,

If my overridden paintComponent starts with
  public void paintComponent(Graphics g) {
    super.paintComponent(g);

should that draw the right background color. I thought yes, but I
discovered no and I have to do?

    g.setColor(getBackground());
    g.fillRect(0, 0, getWidth(), getHeight());

Am I doing the right thing or missing something?


On Windows, a JTextField is opaque by default. If I create one and set
its background color, whether or not I override paintComponent() it
draws the background color unless I leave out the super.paintComponent().

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test extends JFrame {
     public test() {
         setLayout(new GridBagLayout());
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         getContentPane().setBackground(Color.RED);
         JTextField tf = new JTextField("Hello World"); /* {
             public void paintComponent(Graphics g) {
                 super.paintComponent(g);
             }
         };
         */
         tf.setBackground(Color.BLUE);
         add(tf);
         pack();
         setVisible(true);
     }

     public static void main(String[] args) {
         new test();
     }
}

Maybe you could write an SSCCE to demonstrate your problem.

--

Knute Johnson
email s/nospam/knute2009/

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