iconnoderenderer.java

Java中Swing界面库中几个类使用的例子

/* (swing1.1) */ 
package jp.gr.java_conf.tame.swing.tree;

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;


/**
 * @version 1.0 01/12/99
 */
public class IconNodeRenderer extends DefaultTreeCellRenderer {

  public Component getTreeCellRendererComponent(JTree tree, Object value,
      boolean sel, boolean expanded, boolean leaf,
      int row, boolean hasFocus) {
      
    super.getTreeCellRendererComponent(tree, value,
       sel, expanded, leaf, row, hasFocus);
       
    Icon icon = ((IconNode)value).getIcon();
    
    if (icon == null) {
      Hashtable icons = (Hashtable)tree.getClientProperty("JTree.icons");
      String name = ((IconNode)value).getIconName();
      if ((icons != null) && (name != null)) {
        icon = (Icon)icons.get(name);
        if (icon != null) {
          setIcon(icon);
        }
      }
    } else {
      setIcon(icon);
    }
    
    return this;
  }
}