Java实现的Windows资源管理器实例

// FileTree.java
/***********************************************************
 *  Author: Jason
 *   email: tl21cen@hotmail.com
 * CSDN blog: http://blog.csdn.net/UnAgain/
 ***********************************************************/
package tl.exercise.swing;
import java.awt.Component;
import java.io.File;
import java.util.Vector;
import javax.swing.Icon;
import javax.swing.JTree;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.filechooser.FileSystemView;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
public class FileTree extends JTree {
  static final long serialVersionUID = 0;
  private FileList theList;
  public FileTree(FileList list) {
    theList = list;
    setModel(new FileSystemModel(new FolderNode()));
    this.setCellRenderer(new FolderRenderer());
    addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent tse) {
      }
    });   
    this.setSelectionRow(0);
  }
  public void fireValueChanged(TreeSelectionEvent tse) {
    TreePath tp = tse.getNewLeadSelectionPath();
    Object o = tp.getLastPathComponent();
    // theList.fireTreeSelectionChanged((PathNode)o);
    theList.fireTreeSelectionChanged((FolderNode) o);
  }
  public void fireTreeCollapsed(TreePath path) {
    super.fireTreeCollapsed(path);
    TreePath curpath = getSelectionPath();
    if (path.isDescendant(curpath)) {
      setSelectionPath(path);
    }
  }
  public void fireTreeWillExpand(TreePath path) {
    System.out.println("Path will expand is " + path);
  }
  public void fireTreeWillCollapse(TreePath path) {
    System.out.println("Path will collapse is " + path);
  }
  class ExpansionListener implements TreeExpansionListener {
    FileTree tree;
    public ExpansionListener(FileTree ft) {
      tree = ft;
    }
    public void treeCollapsed(TreeExpansionEvent tee) {
    }
    public void treeExpanded(TreeExpansionEvent tee) {
    }
  }
}
class FileSystemModel implements TreeModel {
  I_fileSystem theRoot;
  char fileType = I_fileSystem.DIRECTORY;
  public FileSystemModel(I_fileSystem fs) {
    theRoot = fs;
  }
  public Object getRoot() {
    return theRoot;
  }
  public Object getChild(Object parent, int index) {
    return ((I_fileSystem) parent).getChild(fileType, index);
  }
  public int getChildCount(Object parent) {
    return ((I_fileSystem) parent).getChildCount(fileType);
  }
  public boolean isLeaf(Object node) {
    return ((I_fileSystem) node).isLeaf(fileType);
  }
  public int getIndexOfChild(Object parent, Object child) {
    return ((I_fileSystem) parent).getIndexOfChild(fileType, child);
  }
  public void valueForPathChanged(TreePath path, Object newValue) {
  }
  public void addTreeModelListener(TreeModelListener l) {
  }
  public void removeTreeModelListener(TreeModelListener l) {
  }
}
interface I_fileSystem {
  final public static char DIRECTORY = 'D';
  final public static char FILE = 'F';
  final public static char ALL = 'A';
  public Icon getIcon();
  public I_fileSystem getChild(char fileType, int index);
  public int getChildCount(char fileType);
  public boolean isLeaf(char fileType);
  public int getIndexOfChild(char fileType, Object child);
}
/**
 * A data model for a JTree. This model explorer windows file system directly.
 *
 * <p>
 * Perhaps there is a fatal bug with this design. For speed, each of instances
 * of this model contains file objects of subdirectory, up to now, there isn't
 * any method to release them until program be end. I'm afraid that the memory
 * would be full of if the file system is large enough and JVM memery size
 * setted too small.
 *
 * <p>
 * I won't pay more attention to solve it. it isn't goal of current a exercise.
 *
 * @author Jason
 */
class FolderNode implements I_fileSystem {
  // private static FolderNode theRoot;
  private static FileSystemView fsView;
  private static boolean showHiden = true;;
  private File theFile;
  private Vector<File> all = new Vector<File>();
  private Vector<File> folder = new Vector<File>();
  /**
   * set that whether apply hiden file.
   *
   * @param ifshow
   */
  public void setShowHiden(boolean ifshow) {
    showHiden = ifshow;
  }
  public Icon getIcon() {
    return fsView.getSystemIcon(theFile);
  }
  public String toString() {
    // return fsView.
    return fsView.getSystemDisplayName(theFile);
  }
  /**
   * create a root node. by default, it should be the DeskTop in window file
   * system.
   *
   */
  public FolderNode() {
    fsView = FileSystemView.getFileSystemView();
    theFile = fsView.getHomeDirectory();
    prepareChildren();
  }
  private void prepareChildren() {
   File[] files = fsView.getFiles(theFile, showHiden);
    for (int i = 0; i < files.length; i++) {
      all.add(files[i]);
      if (files[i].isDirectory()
          && !files[i].toString().toLowerCase().endsWith(".lnk")) {
        folder.add(files[i]);
      }
    }
  }
  private FolderNode(File file) {
    theFile = file;
    prepareChildren();
  }
  public FolderNode getChild(char fileType, int index) {
    if (I_fileSystem.DIRECTORY == fileType) {
      return new FolderNode(folder.get(index));
    } else if (I_fileSystem.ALL == fileType) {
      return new FolderNode(all.get(index));
    } else if (I_fileSystem.FILE == fileType) {
      return null;
    } else {
      return null;
    }
  }
  public int getChildCount(char fileType) {
    if (I_fileSystem.DIRECTORY == fileType) {
      return folder.size();
    } else if (I_fileSystem.ALL == fileType) {
      return all.size();
    } else if (I_fileSystem.FILE == fileType) {
      return -1;
    } else {
      return -1;
    }
  }
  public boolean isLeaf(char fileType) {
    if (I_fileSystem.DIRECTORY == fileType) {
      return folder.size() == 0;
    } else if (I_fileSystem.ALL == fileType) {
      return all.size() == 0;
    } else if (I_fileSystem.FILE == fileType) {
      return true;
    } else {
      return true;
    }
  }
  public int getIndexOfChild(char fileType, Object child) {
    if (child instanceof FolderNode) {
      if (I_fileSystem.DIRECTORY == fileType) {
        return folder.indexOf(((FolderNode) child).theFile);
      } else if (I_fileSystem.ALL == fileType) {
        return all.indexOf(((FolderNode) child).theFile);
      } else if (I_fileSystem.FILE == fileType) {
        return -1;
      } else {
        return -1;
      }
    } else {
      return -1;
    }
  }
}
class FolderRenderer extends DefaultTreeCellRenderer {
  private static final long serialVersionUID = 1L;
  public Component getTreeCellRendererComponent(JTree tree, Object value,
      boolean sel, boolean expanded, boolean leaf, int row,
      boolean hasFocus) {
    I_fileSystem node = (I_fileSystem) value;
    Icon icon = node.getIcon();
    setLeafIcon(icon);
    setOpenIcon(icon);
    setClosedIcon(icon);
    return super.getTreeCellRendererComponent(tree, value, sel, expanded,
       leaf, row, hasFocus);
  }
}