VerticalBoxLayoutManagerContainerTest.java Source code

Introduction

Here is the source code for VerticalBoxLayoutManagerContainerTest.java

Source

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.LayoutManager;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class VerticalBoxLayoutManagerContainerTest {

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container pane = new BoxPanel();
        f.setContentPane(pane);
        BoxLayout bl = new BoxLayout(pane, BoxLayout.Y_AXIS);
        pane.setLayout(bl);
        for (float align = 0.0f; align <= 1.0f; align += 0.25f) {
            JButton button = new JButton("X Alignment = " + align);
            button.setAlignmentX(align);
            pane.add(button);
            pane.add(Box.createRigidArea(new Dimension(0, 15)));
        }
        f.setSize(400, 300);
        f.setVisible(true);
    }
}

class BoxPanel extends JPanel {

    public void paintChildren(Graphics g) {
        super.paintChildren(g);
        Dimension size = getSize();
        LayoutManager manager = getLayout();
        if ((manager != null) && (manager instanceof BoxLayout)) {
            BoxLayout layout = (BoxLayout) manager;
            boolean vertical = true;
            if (vertical) {
                int axis = (int) (layout.getLayoutAlignmentX(this) * size.width);
                g.fillRect(axis - 1, 0, 3, size.height);
            } else {
                int axis = (int) (layout.getLayoutAlignmentY(this) * size.height);
                g.fillRect(0, axis - 1, size.width, 3);
            }
        }
    }

}