CustomBorderSample.java Source code

Introduction

Here is the source code for CustomBorderSample.java

Source

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;

import javax.swing.DefaultListCellRenderer;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ListCellRenderer;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;

public class CustomBorderSample {
    public static void main(String args[]) {
        String labels[] = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J" };
        JFrame frame = new JFrame("Custom Border");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container contentPane = frame.getContentPane();
        JList jlist = new JList(labels);
        ListCellRenderer renderer = new FocusedTitleListCellRenderer();
        jlist.setCellRenderer(renderer);
        JScrollPane sp = new JScrollPane(jlist);
        contentPane.add(sp, BorderLayout.CENTER);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}

class FocusedTitleListCellRenderer implements ListCellRenderer {
    protected static Border noFocusBorder = new EmptyBorder(15, 1, 1, 1);

    protected static TitledBorder focusBorder = new TitledBorder(LineBorder.createGrayLineBorder(), "Focused");

    protected DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer();

    public String getTitle() {
        return focusBorder.getTitle();
    }

    public void setTitle(String newValue) {
        focusBorder.setTitle(newValue);
    }

    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected,
            boolean cellHasFocus) {
        JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected,
                cellHasFocus);
        renderer.setBorder(cellHasFocus ? focusBorder : noFocusBorder);
        return renderer;
    }
}