panelbox.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.*;

public class PanelBox
    extends Panel
{
   private int h = 0, w = 0, d = 0;
   private Component component = null;
   private Color bgColor = Color.white;
   private String label = "Panel";
   private Font font = new Font("Helvetica", Font.BOLD, 12);
   public PanelBox(Component _component, String _label)
   {
      super();
      component = _component;
      label = _label;
      setup();
   }

   public PanelBox(Component _component, String _label, Color _bgColor)
   {
      super();
      component = _component;
      label = _label;
      bgColor = _bgColor;
      setup();
   }

   public Insets getInsets()
   {
      return new Insets(h + 1, h + 1, h + 1, h + 1);
   }

   public void paint(Graphics g)
   {
      g.setColor(Color.gray);
      g.drawRect(d, d, getSize().width - 2 * d, getSize().height - 2 * d);
      g.setColor(Color.black);
      g.drawLine(getSize().width - d + 1, d,
                 getSize().width - d + 1, getSize().height - d + 1);
      g.drawLine(d, getSize().height - d + 1,
                 getSize().width - d + 1, getSize().height - d + 1);
      g.setFont(font);
      g.setColor(bgColor);
      g.fillRect( (int) (1.5 * h) - 5, 0, w + 10, h + 2);
      g.setColor(Color.black);
      g.drawString(label, (int) (1.5 * h), h - 2);
   }

   private void setup()
   {
      super.setBackground(bgColor);
      setBackground(bgColor);
      setLayout(new BorderLayout());
      add("Center", component);
      w = getFontMetrics(font).stringWidth(label);
      h = getFontMetrics(font).getMaxAscent() + 1;
      d = h / 2;
   }
}