Swing set frame location in CentOS

Question

I'm working on Swing project, running on CentOS. I encountered a problem when invoke setLocation method of JFrame. My screen size is 1920 * 1080 and JFrame window size is 900 * 300. I want to the part of JFrame window out of the screen from right side, so I pass 1820 and 0 as the params into setLocation method, but the running result is the JFrame window not out of the screen, instead of the JFrame window right border align with the screen right border.
Does anyone knows what is wrong?

Answer 1

Your current approach has the effect of hiding the window's drag bar, which might preclude moving the window. The platform's window manager may forbid this. Instead, let the platform do the adjustment and then move the window relative to the GraphicsDevice bounds.

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 * @see http://stackoverflow.com/a/34651163/230513
 * @see http://stackoverflow.com/a/9755371/230513
 */
public class UpperRightFrame {

    private static final int VISIBLE = 100;

    private void display() {
        JFrame f = new JFrame("UpperRightFrame");
        f.add(new Box(BoxLayout.Y_AXIS) {
            {
                add(new JLabel(System.getProperty("os.name")));
                add(new JLabel(System.getProperty("os.version")));
            }

            @Override // placeholder for actual content
            public Dimension getPreferredSize() {
                return new Dimension(320, 240);
            }
        });
        f.pack();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice defaultScreen = ge.getDefaultScreenDevice();
        Rectangle rect = defaultScreen.getDefaultConfiguration().getBounds();
        int x = (int) rect.getMaxX() - f.getWidth();
        int y = 0;
        f.setLocation(x, y);
        f.setVisible(true);
        x = (int) rect.getMaxX() - VISIBLE;
        y = f.getLocation().y;
        f.setLocation(x, y);
    }

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