tooltiptreeexample.java

Java中Swing界面库中几个类使用的例子

/* (swing1.1beta3) swing#948 */
//package jp.gr.java_conf.tame.swing.examples;

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

/**
 * @version 1.0 11/09/98
 */
class ToolTipTreeNode extends DefaultMutableTreeNode {
  private String toolTipText;
  
  public ToolTipTreeNode(String str, String toolTipText) {
    super(str);
    this.toolTipText = toolTipText;
  }

  public String getToolTipText() {
    return toolTipText;
  }
} 

public class ToolTipTreeExample extends JFrame {
  public ToolTipTreeExample() {
    super("ToolTipTreeExample");
    String[][] strs = {{"swing", "boat"    },     // 0
		       {"platf", "paltform"},     // 1
		       {"basic", "fortran" },     // 2
		       {"metal", "heavy"   },     // 3
		       {"JTree", "three"  }};     // 4
                                             
    ToolTipTreeNode[] nodes = new ToolTipTreeNode[strs.length];
    for (int i=0;i<strs.length;i++) {
      nodes[i] = new ToolTipTreeNode(strs[i][0],strs[i][1]); 
    }
    nodes[0].add(nodes[1]);
    nodes[1].add(nodes[2]);
    nodes[1].add(nodes[3]);
    nodes[0].add(nodes[4]);
    JTree tree = new JTree( nodes[0] ){
      public String getToolTipText(MouseEvent evt) {
	if (getRowForLocation(evt.getX(), evt.getY()) == -1) return null;    
	TreePath curPath = getPathForLocation(evt.getX(), evt.getY());
	return ((ToolTipTreeNode)curPath.getLastPathComponent()).getToolTipText();
      }
    };
    tree.setToolTipText("");
    JScrollPane sp = new JScrollPane(tree);
    getContentPane().add(sp, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    ToolTipTreeExample frame = new ToolTipTreeExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}