Re: JFrame window dimensions

In article <i1csh7$tgb$1@news.albasani.net>, Lew <noone@lewscanon.com>
wrote:


Lew: Ah, a subtle trap for the unwary. Thanks for highlighting it. IIUC,
this is predicated on the idea that the constructor should complete
before invoking the instance's public methods.

Eustace: More on the recommended approach is shown in the "Initial
Threads" section of the tutorial [1]. Here's another idiom that avoids
the peril and obviates extending JFrame. Also, I've found it instructive
to run the program in a profiler while resizing the window, paying
particular attention to the event queue.

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

/** @author John B. Matthews */
public class Temp implements Runnable {

    private static final int B = 10; // border

    public static void main(String[] args) {
        EventQueue.invokeLater(new Temp());
    }

    @Override
    public void run() {
        JFrame frame = new JFrame("Temp");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel(new GridLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(B, B, B, B));
        panel.add(new CustomPanel());
        frame.add(panel);
        frame.pack(); // adjust to the preferred size of subcomponents.
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private static final class CustomPanel extends JPanel {

        private static final int W = 1200;
        private static final int H = 600;

        public CustomPanel() {
            this.setPreferredSize(new Dimension(W, H));
            this.setBackground(Color.black);
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            System.out.println(getWidth() + " " + getHeight());
        }
    }
}

[1]<http://download.oracle.com/docs/cd/E17409_01/javase/tutorial/uiswing/
concurrency/initial.html>