jtree.java

linux下建立JAVA虚拟机的源码KAFFE

      // Nothing to do here.
    }
    
    /**
     * Tree Model Node change notification.
     * 
     * @param e - the event
     */
    public void treeNodesInserted(TreeModelEvent e)
    {
      // Nothing to do here.
    }
    
    /**
     * Tree Model Node change notification.
     * 
     * @param e - the event
     */
    public void treeNodesRemoved(TreeModelEvent e)
    {
      // Nothing to do here.
    }
    
    /**
     * Tree Model structure change change notification.
     * 
     * @param e - the event
     */
    public void treeStructureChanged(TreeModelEvent e)
    {
      // Nothing to do here.
    }
    
    /**
     * Tree Selection Listener value change method.
     * 
     * @param e - the event
     */
    public void valueChanged(TreeSelectionEvent e)
    {
      fireValueChanged(e);
    }
  }
  
  public static class DynamicUtilTreeNode extends DefaultMutableTreeNode
  {
    protected Object childValue;

    protected boolean loadedChildren;

    /**
     * Currently not set or used by this class. It might be set and used in
     * later versions of this class.
     */
    protected boolean hasChildren;

    public DynamicUtilTreeNode(Object value, Object children)
    {
      super(value);
      childValue = children;
      loadedChildren = false;
    }

    public int getChildCount()
    {
      loadChildren();
      return super.getChildCount();
    }

    protected void loadChildren()
    {
      if (!loadedChildren)
        {
          createChildren(this, childValue);
          loadedChildren = true;
        }
    }

    public Enumeration children()
    {
      loadChildren();
      return super.children();
    }

    /**
     * Returns the child node at position <code>pos</code>. Subclassed
     * here to load the children if necessary.
     * 
     * @param pos the position of the child node to fetch
     * 
     * @return the childnode at the specified position
     */
    public TreeNode getChildAt(int pos)
    {
      loadChildren();
      return super.getChildAt(pos);
    }

    public boolean isLeaf()
    {
      return (childValue == null || !(childValue instanceof Hashtable
          || childValue instanceof Vector || childValue.getClass()
          .isArray()));
    }

    public static void createChildren(DefaultMutableTreeNode parent,
                                      Object children)
    {
      if (children instanceof Hashtable)
        {
          Hashtable tab = (Hashtable) children;
          Enumeration e = tab.keys();
          while (e.hasMoreElements())
            {
              Object key = e.nextElement();
              Object val = tab.get(key);
              parent.add(new DynamicUtilTreeNode(key, val));
            }
        }
      else if (children instanceof Vector)
        {
          Iterator i = ((Vector) children).iterator();
          while (i.hasNext())
            {
              Object n = i.next();
              parent.add(new DynamicUtilTreeNode(n, n));
            }
        }
      else if (children != null && children.getClass().isArray())
        {
          Object[] arr = (Object[]) children;
          for (int i = 0; i < arr.length; ++i)
            parent.add(new DynamicUtilTreeNode(arr[i], arr[i]));
        }
    }
  }

  /**
   * Listens to the model of the JTree and updates the property 
   * <code>expandedState</code> if nodes are removed or changed.
   */
  protected class TreeModelHandler implements TreeModelListener
  {

    /**
     * Creates a new instance of TreeModelHandler.
     */
    protected TreeModelHandler()
    {
      // Nothing to do here.
    }

    /**
     * Notifies when a node has changed in some ways. This does not include
     * that a node has changed its location or changed it's children. It
     * only means that some attributes of the node have changed that might
     * affect its presentation.
     * 
     * This method is called after the actual change occured.
     * 
     * @param ev the TreeModelEvent describing the change
     */
    public void treeNodesChanged(TreeModelEvent ev)
    {
      // Nothing to do here.
    }

    /**
     * Notifies when a node is inserted into the tree.
     * 
     * This method is called after the actual change occured.
     * 
     * @param ev the TreeModelEvent describing the change
     */
    public void treeNodesInserted(TreeModelEvent ev)
    {
      // nothing to do here
    }

    /**
     * Notifies when a node is removed from the tree.
     * 
     * This method is called after the actual change occured.
     *
     * @param ev the TreeModelEvent describing the change
	 */
    public void treeNodesRemoved(TreeModelEvent ev)
    {
      // TODO: The API docs suggest that this method should do something
      // but I cannot really see what has to be done here ...
    }

    /**
     * Notifies when the structure of the tree is changed.
     * 
     * This method is called after the actual change occured.
     * 
     * @param ev the TreeModelEvent describing the change
     */
    public void treeStructureChanged(TreeModelEvent ev)
    {
      // Set state of new path.
      TreePath path = ev.getTreePath();
      setExpandedState(path, isExpanded(path));
    }
  }

  /**
   * This redirects TreeSelectionEvents and rewrites the source of it to be
   * this JTree. This is typically done when the tree model generates an
   * event, but the JTree object associated with that model should be listed
   * as the actual source of the event.
   */
  protected class TreeSelectionRedirector implements TreeSelectionListener,
                                                     Serializable
  {
    /** The serial version UID. */
    private static final long serialVersionUID = -3505069663646241664L;

    /**
     * Creates a new instance of TreeSelectionRedirector
     */
    protected TreeSelectionRedirector()
    {
      // Nothing to do here.
    }

    /**
     * Notifies when the tree selection changes.
     * 
     * @param ev the TreeSelectionEvent that describes the change
     */
    public void valueChanged(TreeSelectionEvent ev)
    {
      TreeSelectionEvent rewritten =
        (TreeSelectionEvent) ev.cloneWithSource(JTree.this);
      fireValueChanged(rewritten);
      JTree.this.repaint();
    }
  }

  /**
   * A TreeModel that does not allow anything to be selected.
   */
  protected static class EmptySelectionModel extends DefaultTreeSelectionModel
  {
    /** The serial version UID. */
    private static final long serialVersionUID = -5815023306225701477L;

    /**
     * The shared instance of this model.
     */
    protected static final EmptySelectionModel sharedInstance =
      new EmptySelectionModel();

    /**
     * Creates a new instance of EmptySelectionModel.
     */
    protected EmptySelectionModel()
    {
      // Nothing to do here.
    }

    /**
     * Returns the shared instance of EmptySelectionModel.
     * 
     * @return the shared instance of EmptySelectionModel
     */
    public static EmptySelectionModel sharedInstance()
    {
      return sharedInstance;
    }

    /**
     * This catches attempts to set a selection and sets nothing instead.
     * 
     * @param paths not used here
     */
    public void setSelectionPaths(TreePath[] paths)
    {
      // We don't allow selections in this class.
    }

    /**
     * This catches attempts to add something to the selection.
     * 
     * @param paths not used here
     */
    public void addSelectionPaths(TreePath[] paths)
    {
      // We don't allow selections in this class.
    }

    /**
     * This catches attempts to remove something from the selection.
     * 
     * @param paths not used here
     */
    public void removeSelectionPaths(TreePath[] paths)
    {
      // We don't allow selections in this class.
    }
  }

  private static final long serialVersionUID = 7559816092864483649L;

  public static final String CELL_EDITOR_PROPERTY = "cellEditor";

  public static final String CELL_RENDERER_PROPERTY = "cellRenderer";

  public static final String EDITABLE_PROPERTY = "editable";

  public static final String INVOKES_STOP_CELL_EDITING_PROPERTY =
    "invokesStopCellEditing";

  public static final String LARGE_MODEL_PROPERTY = "largeModel";

  public static final String ROOT_VISIBLE_PROPERTY = "rootVisible";

  public static final String ROW_HEIGHT_PROPERTY = "rowHeight";

  public static final String SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";

  public static final String SELECTION_MODEL_PROPERTY = "selectionModel";

  public static final String SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";

  public static final String TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";

  public static final String TREE_MODEL_PROPERTY = "model";

  public static final String VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";

  /** @since 1.3 */
  public static final String ANCHOR_SELECTION_PATH_PROPERTY =
    "anchorSelectionPath";

	/** @since 1.3 */
  public static final String LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";

  /** @since 1.3 */
  public static final String EXPANDS_SELECTED_PATHS_PROPERTY =
    "expandsSelectedPaths";

  private static final Object EXPANDED = new Object();

  private static final Object COLLAPSED = new Object();

  private boolean dragEnabled;

  private boolean expandsSelectedPaths;

  private TreePath anchorSelectionPath;

  private TreePath leadSelectionPath;

  /**
   * This contains the state of all nodes in the tree. Al/ entries map the
   * TreePath of a note to to its state. Valid states are EXPANDED and
   * COLLAPSED. Nodes not in this Hashtable are assumed state COLLAPSED.
   */
  private Hashtable nodeStates = new Hashtable();

  protected transient TreeCellEditor cellEditor;

  protected transient TreeCellRenderer cellRenderer;

  protected boolean editable;

  protected boolean invokesStopCellEditing;

  protected boolean largeModel;

  protected boolean rootVisible;

  protected int rowHeight;

  protected boolean scrollsOnExpand;

  protected transient TreeSelectionModel selectionModel;

  protected boolean showsRootHandles;

  protected int toggleClickCount;

  protected transient TreeModel treeModel;

  protected int visibleRowCount;

  /**
   * Handles TreeModelEvents to update the expandedState.
   */
  protected transient TreeModelListener treeModelListener;

  /**
   * Redirects TreeSelectionEvents so that the source is this JTree.
   */
  protected TreeSelectionRedirector selectionRedirector =
    new TreeSelectionRedirector();

  /**
   * Creates a new <code>JTree</code> object.
   */
  public JTree()
  {
    this(createTreeModel(null));
  }

  /**
   * Creates a new <code>JTree</code> object.
   * 
   * @param value the initial nodes in the tree
   */
  public JTree(Hashtable value)
  {
    this(createTreeModel(value));
  }

  /**
   * Creates a new <code>JTree</code> object.
   * 
   * @param value the initial nodes in the tree
   */
  public JTree(Object[] value)
  {
    this(createTreeModel(value));
  }

  /**
   * Creates a new <code>JTree</code> object.
   * 
   * @param model the model to use
   */
  public JTree(TreeModel model)
  {
    updateUI();
    setRootVisible(true);
    setModel(model);
    setSelectionModel(new EmptySelectionModel());
    selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
    
    // The root node appears expanded by default.
    nodeStates.put(new TreePath(model.getRoot()), EXPANDED);
  }

  /**
   * Creates a new <code>JTree</code> object.
   * 
   * @param root the root node
   */
  public JTree(TreeNode root)
  {
    this(root, false);
  }

  /**
   * Creates a new <code>JTree</code> object.
   * 
   * @param root the root node
   * @param asksAllowChildren if false, all nodes without children are leaf
   *        nodes. If true, only nodes that do not allow children are leaf
   *        nodes.
   */
  public JTree(TreeNode root, boolean asksAllowChildren)
  {
    this(new DefaultTreeModel(root, asksAllowChildren));
  }

  /**
   * Creates a new <code>JTree</code> object.
   * 
   * @param value the initial nodes in the tree
   */
  public JTree(Vector value)
  {
    this(createTreeModel(value));
  }

  public int getRowForPath(TreePath path)
  {
    TreeUI ui = getUI();

    if (ui != null)
      return ui.getRowForPath(this, path);

    return -1;
  }

  public TreePath getPathForRow(int row)
  {
    TreeUI ui = getUI();
    return ui != null ? ui.getPathForRow(this, row) : null;
  }

  protected TreePath[] getPathBetweenRows(int index0, int index1)
  {
    TreeUI ui = getUI();

    if (ui == null)
      return null;

    int minIndex = Math.min(index0, index1);
    int maxIndex = Math.max(index0, index1);
    TreePath[] paths = new TreePath[maxIndex - minIndex + 1];

    for (int i = minIndex; i <= maxIndex; ++i)
      paths[i - minIndex] = ui.getPathForRow(this, i);

    return paths;
  }

  /**
   * Creates a new <code>TreeModel</code> object.
   * 
   * @param value the values stored in the model
   */
  protected static TreeModel createTreeModel(Object value)
  {
    return new DefaultTreeModel(new DynamicUtilTreeNode(value, value));
  }

  /**