mytreenode.java

使用java技术写的一个图像处理框架,实现了目录树,分割窗格,任务栏图标等技术

 import javax.swing.tree.*;
 import java.io.*;
 import javax.swing.*;
public class MyTreeNode extends DefaultMutableTreeNode
{
    boolean explored=false;
    public MyTreeNode(File file)
    {
        super(file);
    }
    public boolean isExplored()
    {
      return explored;
    }
    public File getFile()
    {
        File file=(File)getUserObject();
        return file;
    }
    public boolean isDirectory()
    {
        File file=getFile();
         return file.isDirectory();
    }
    public boolean canRead()
    {
        File file=getFile();
        return file.canRead();
    }
    public boolean isExists()
    {
        File file=getFile();
        return file.exists();
    }
    public void explore()
    {
        if(!isDirectory())
        return;
        if(!canRead())
        {
           errorMessage("此目录不可读，请检查你是否有权限！");
           return;
        }

        if(!isExists())
        {
             errorMessage("此目录不存在，或是设备未连接好！");
             return;
        }

        if(!isExplored())
        {
            File file=(File)getUserObject();
            File[] child=file.listFiles();
            if(child!=null)
            {
                for(int i=0;i<child.length;i++)
                {
                    if(child[i].isDirectory())
                    {
                        add(new MyTreeNode(child[i]));
                    }
                }
            }
            explored=true;
        }

    }
    public boolean getAllowsChildren() {
        return isDirectory();
    }

    public boolean isLeaf()
    {
        return !isDirectory();
    }
    public void errorMessage(String message)
    {
        JOptionPane.showMessageDialog(null,message);
    }
    public String toString()
    {
       File file=(File)getUserObject();
       String filename=file.toString();
       int index=filename.lastIndexOf(File.separator);
       return (index!=-1&&index!=filename.length()-1)?filename.substring(index+1):filename;
    }
}