-- Main.aberrant - 24 May 2008

Demonstrates how to use Java2D^? to create a custom border.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.RenderingHints;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.border.Border;

/**
 * 
 * CustomBorderDemo - demonstrates how to create a custom border.
 * 
 * @author Collin Fagan
 */
public class CustomBorderDemo extends JPanel {

   public CustomBorderDemo() {

      setLayout(new GridLayout(0, 2, 10, 10));

      JComponent display1 = new JScrollPane(new JTree());
      display1.setBorder(new GradientTitleBorder("GradientTitleBorder 1",
            Color.RED, Color.YELLOW, Color.WHITE, 40));
      add(display1);

      JComponent display2 = new JScrollPane(new JTree());
      display2.setBorder(new GradientTitleBorder("GradientTitleBorder 2"));
      add(display2);

      JComponent display3 = new JScrollPane(new JTree());
      display3.setBorder(new GradientTitleBorder("GradientTitleBorder 3",
            new Color(0x418EDC), new Color(0x6B91B8), Color.WHITE, 18));
      add(display3);

      JComponent display4 = new JScrollPane(new JTree());
      display4.setBorder(BorderFactory.createTitledBorder("TitledBorder 1"));
      add(display4);

      setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

   }

   /**
    * Start the demo on the Event Dispatch Thread.
    * 
    * @param args
    *            the command line arguments
    */
   public static void main(String[] args) {

      // turn bold fonts off in metal
      UIManager.put("swing.boldMetal", Boolean.FALSE);

      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            JFrame demoFrame = new JFrame();
            demoFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            demoFrame.setContentPane(new CustomBorderDemo());
            demoFrame.setSize(400, 400);
            demoFrame.setVisible(true);
         }
      });
   }

   /**
    * Custom border class, paints a titled border using a gradient. 
    */
   public class GradientTitleBorder implements Border {

      private String title;

      private int titleHeight;

      private Insets insets = new Insets(titleHeight, 0, 0, 0);

      private Color primaryColor;

      private Color secondaryColor;

      private Color fontColor;

      private Color shadowColor;

      private int indent = 5;
      
      private Font titleFont;

      /**
       * Constructtor that assumes a title height.
       * 
       * @param title - string to display
       * @param primaryColor - first color of gradient
       * @param secondaryColor - second color of gradient (lower)
       * @param fontColor - color for the font
       */
      public GradientTitleBorder(String title, Color primaryColor,
            Color secondaryColor, Color fontColor) {
         this(title, primaryColor, secondaryColor, fontColor, 30);
      }

      /**
       * Full option constructor
       * 
       * @param title - string to display
       * @param primaryColor - first color of gradient
       * @param secondaryColor - second color of gradient (lower)
       * @param fontColor - color for the font
       * @param titleHeight - height of the title bar
       */
      public GradientTitleBorder(String title, Color primaryColor,
            Color secondaryColor, Color fontColor, int titleHeight) {
         this.title = title;
         this.titleHeight = titleHeight;
         this.insets = new Insets(titleHeight, 2, 2, 2);
         this.primaryColor = primaryColor;
         this.shadowColor = primaryColor.darker();
         this.secondaryColor = secondaryColor;
         this.fontColor = fontColor;
         this.titleFont = UIManager.getFont("TitledBorder.font").deriveFont(Font.BOLD);
      }

      /**
       * Creates a GradientTitleBorder with default values.
       * @param title
       */
      public GradientTitleBorder(String title) {
         this(title, Color.BLACK, Color.GRAY, Color.WHITE, 30);
      }

      /**
       * 
       */
      public Insets getBorderInsets(Component c) {
         return insets;
      }

      /**
       * 
       */
      public boolean isBorderOpaque() {
         return false;
      }

      /**
       * paint the border, being carefull to stay inside the insets.  
       */
      public void paintBorder(Component c, Graphics g, int x, int y,
            int width, int height) {
         
         Graphics2D g2d = (Graphics2D) g;
         g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
               RenderingHints.VALUE_ANTIALIAS_ON);

         GradientPaint gp = new GradientPaint(x, y, primaryColor, x, y
               + titleHeight, secondaryColor);
         g2d.setPaint(gp);
         g2d.fillRect(x, y, width, titleHeight);

         g2d.setColor(shadowColor);
         g2d.drawRect(x, y - 1, width - 1, titleHeight);

         g2d.setFont(titleFont);

         g2d.setColor(shadowColor);
         int titleOffset = (titleHeight / 2) + (c.getFont().getSize() / 2)
               - 1;

         g2d.drawString(title, x + insets.left + indent + 1, y + titleOffset
               + 1);

         g2d.setColor(fontColor);
         g2d.drawString(title, x + insets.left + indent, y + titleOffset);

         g2d.setColor(shadowColor);
         g2d.drawRect(x, y - 1, width - 1, height);
      }
   }

}