treedemo4.java

树(Tree)的使用

/**
    JTree利用TreeCellRenderer界面来运行绘制节点的工作，同样的，你不需要直接支实现这个
界面所定义的方法，因为java本身提供一个已经实现好的类来给我们使用，此类就是
DefaultTreeCellRenderer,你可以在javax.swing.tree package中找到此类所提供的方法。
下面为使用DefaultTreeCellRenderer更改节点图案的一个例子:
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
//import com.incors.plaf.alloy.*;

public class TreeDemo4{
public TreeDemo4(){
JFrame f=new JFrame("TreeDemo");
Container contentPane=f.getContentPane();

DefaultMutableTreeNode root = new DefaultMutableTreeNode("资源管理器");
DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("我的公文包");
DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("我的电脑");
DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("收藏夹");
DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Readme");
DefaultTreeModel treeModel = new DefaultTreeModel(root);
treeModel.insertNodeInto(node1, root, root.getChildCount());
treeModel.insertNodeInto(node2, root, root.getChildCount());
treeModel.insertNodeInto(node3, root, root.getChildCount());
treeModel.insertNodeInto(node4, root, root.getChildCount());

DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("公司文件");
treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());
leafnode = new DefaultMutableTreeNode("个人信件");
treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());
leafnode = new DefaultMutableTreeNode("私人文件");
treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());

leafnode = new DefaultMutableTreeNode("本机磁盘(C:)");
treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());
leafnode = new DefaultMutableTreeNode("本机磁盘(D:)");
treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());
leafnode = new DefaultMutableTreeNode("本机磁盘(E:)");
treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());

DefaultMutableTreeNode node31 = new DefaultMutableTreeNode("网站列表");
treeModel.insertNodeInto(node31, node3, node3.getChildCount());
leafnode = new DefaultMutableTreeNode("奇摩站");
treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());
leafnode = new DefaultMutableTreeNode("职棒消息");
treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());
leafnode = new DefaultMutableTreeNode("网络书店");
treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());
/*try {
LookAndFeel alloyLnF = new AlloyLookAndFeel(); 
UIManager.setLookAndFeel(alloyLnF);
} catch (UnsupportedLookAndFeelException ex) {
// You may handle the exception here
}*/
// this line needs to be implemented in order to make JWS work properly
UIManager.getLookAndFeelDefaults().put("ClassLoader", getClass().getClassLoader());
System.out.println(getClass().getClassLoader());

JTree tree = new JTree(treeModel);
tree.setRowHeight(20);


//******************************************************************************
DefaultTreeCellRenderer cellRenderer=(DefaultTreeCellRenderer)tree.getCellRenderer();
cellRenderer.setLeafIcon(new ImageIcon("..\\icons\\leaf.gif"));

cellRenderer.setOpenIcon(new ImageIcon("..\\icons\\open.gif"));
cellRenderer.setClosedIcon(new ImageIcon("..\\icons\\close.gif"));

cellRenderer.setFont(new Font("宋体",Font.PLAIN,12));//设置字体.
cellRenderer.setBackgroundNonSelectionColor(Color.white);
cellRenderer.setBackgroundSelectionColor(Color.yellow);
cellRenderer.setBorderSelectionColor(Color.red);
/*设置选时或不选时，文字的变化颜色*/
cellRenderer.setTextNonSelectionColor(Color.black);
cellRenderer.setTextSelectionColor(Color.blue);
//******************************************************************************


JScrollPane scrollPane=new JScrollPane();
scrollPane.setViewportView(tree);

contentPane.add(scrollPane);
f.pack();
f.setVisible(true);

f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

}

public static void main(String args[]) {

new TreeDemo4();
}
}