basictreeui.java

gcc的组建

          || e.getActionCommand().equals("selectPrevious")
          || e.getActionCommand().equals("selectNext")
          || e.getActionCommand().equals("selectNextExtendSelection")
          || e.getActionCommand().equals("selectNextChangeLead"))
        (new TreeIncrementAction(0, "")).actionPerformed(e);
      else if (e.getActionCommand().equals("selectParent")
               || e.getActionCommand().equals("selectChild"))
        (new TreeTraverseAction(0, "")).actionPerformed(e);
      else if (e.getActionCommand().equals("selectAll"))
        {
          TreePath[] paths = new TreePath[tree.getVisibleRowCount()];

          Object curr = getNextVisibleNode(treeModel.getRoot());
          int i = 0;
          while (curr != null && i < paths.length)
            {
              paths[i] = new TreePath(getPathToRoot(curr, 0));
              i++;
            }

          tree.addSelectionPaths(paths);
        }
      else if (e.getActionCommand().equals("startEditing"))
        tree.startEditingAtPath(lead);
      else if (e.getActionCommand().equals("toggle"))
        {
          if (tree.isEditing())
              tree.stopEditing();
          else
            {
              Object last = lead.getLastPathComponent();
              TreePath path = new TreePath(getPathToRoot(last, 0));
              if (!treeModel.isLeaf(last))
                toggleExpandState(path);
            }
        }
      else if (e.getActionCommand().equals("clearSelection"))
        tree.clearSelection();

      if (tree.isEditing() && !e.getActionCommand().equals("startEditing"))
        tree.cancelEditing();

      tree.scrollPathToVisible(lead);
    }
  }

  /**
   * This class is used to mimic the behaviour of the JDK when registering
   * keyboard actions. It is the same as the private class used in JComponent
   * for the same reason. This class receives an action event and dispatches it
   * to the true receiver after altering the actionCommand property of the
   * event.
   */
  private static class ActionListenerProxy
    extends AbstractAction
  {
    ActionListener target;

    String bindingCommandName;

    public ActionListenerProxy(ActionListener li, String cmd)
    {
      target = li;
      bindingCommandName = cmd;
    }

    public void actionPerformed(ActionEvent e)
    {
      ActionEvent derivedEvent = new ActionEvent(e.getSource(), e.getID(),
                                                 bindingCommandName,
                                                 e.getModifiers());

      target.actionPerformed(derivedEvent);
    }
  }

  /**
   * The timer that updates the editor component.
   */
  private class EditorUpdateTimer
    extends Timer
    implements ActionListener
  {
    /**
     * Creates a new EditorUpdateTimer object with a default delay of 0.3
     * seconds.
     */
    public EditorUpdateTimer()
    {
      super(300, null);
      addActionListener(this);
    }

    /**
     * Lets the caret blink and repaints the table.
     */
    public void actionPerformed(ActionEvent ev)
    {
      Caret c = ((JTextField) editingComponent).getCaret();
      if (c != null)
        c.setVisible(!c.isVisible());
      tree.repaint();
    }

    /**
     * Updates the blink delay according to the current caret.
     */
    public void update()
    {
      stop();
      Caret c = ((JTextField) editingComponent).getCaret();
      if (c != null)
        {
          setDelay(c.getBlinkRate());
          if (((JTextField) editingComponent).isEditable())
            start();
          else
            c.setVisible(false);
        }
    }
  }

  /**
   * Updates the preferred size when scrolling, if necessary.
   */
  public class ComponentHandler extends ComponentAdapter
    implements ActionListener
  {
    /**
     * Timer used when inside a scrollpane and the scrollbar is adjusting
     */
    protected Timer timer;

    /** ScrollBar that is being adjusted */
    protected JScrollBar scrollBar;

    /**
     * Constructor
     */
    public ComponentHandler()
    {
      // Nothing to do here.
    }

    /**
     * Invoked when the component's position changes.
     * 
     * @param e
     *          the event that occurs when moving the component
     */
    public void componentMoved(ComponentEvent e)
    {
      // TODO: What should be done here, if anything?
    }

    /**
     * Creates, if necessary, and starts a Timer to check if needed to resize the
     * bounds
     */
    protected void startTimer()
    {
      // TODO: Implement this properly.
    }

    /**
     * Returns the JScrollPane housing the JTree, or null if one isn't found.
     * 
     * @return JScrollPane housing the JTree, or null if one isn't found.
     */
    protected JScrollPane getScrollPane()
    {
      return null;
    }

    /**
     * Public as a result of Timer. If the scrollBar is null, or not adjusting,
     * this stops the timer and updates the sizing.
     * 
     * @param ae
     *          is the action performed
     */
    public void actionPerformed(ActionEvent ae)
    {
      // TODO: Implement this properly.
    }
  }

  /**
   * Listener responsible for getting cell editing events and updating the tree
   * accordingly.
   */
  public class CellEditorHandler implements CellEditorListener
  {
    /**
     * Constructor
     */
    public CellEditorHandler()
    {
      // Nothing to do here.
    }

    /**
     * Messaged when editing has stopped in the tree. Tells the listeners
     * editing has stopped.
     * 
     * @param e
     *          is the notification event
     */
    public void editingStopped(ChangeEvent e)
    {
      editingPath = null;
      editingRow = -1;
      stopEditingInCompleteEditing = false;
      if (editingComponent != null)
        {
          tree.remove(editingComponent.getParent());
          editingComponent = null;
        }
      if (cellEditor != null)
        {
          newVal = ((JTextField) getCellEditor().getCellEditorValue()).getText();
          completeEditing(false, false, true);
          if (cellEditor instanceof DefaultTreeCellEditor)
            tree.removeTreeSelectionListener((DefaultTreeCellEditor) cellEditor);
          cellEditor.removeCellEditorListener(cellEditorListener);
          setCellEditor(null);
          createdCellEditor = false;
        }
      isEditing = false;
      tree.requestFocusInWindow(false);
      editorTimer.stop();
      validCachedPreferredSize = false;
      tree.revalidate();
      tree.repaint();
    }

    /**
     * Messaged when editing has been canceled in the tree. This tells the
     * listeners the editor has canceled editing.
     * 
     * @param e
     *          is the notification event
     */
    public void editingCanceled(ChangeEvent e)
    {
      editingPath = null;
      editingRow = -1;
      stopEditingInCompleteEditing = false;
      if (editingComponent != null)
        tree.remove(editingComponent.getParent());
      editingComponent = null;
      if (cellEditor != null)
        {
          if (cellEditor instanceof DefaultTreeCellEditor)
            tree.removeTreeSelectionListener((DefaultTreeCellEditor) cellEditor);
          cellEditor.removeCellEditorListener(cellEditorListener);
          setCellEditor(null);
          createdCellEditor = false;
        }
      tree.requestFocusInWindow(false);
      editorTimer.stop();
      isEditing = false;
      validCachedPreferredSize = false;
      tree.revalidate();
      tree.repaint();
    }
  }// CellEditorHandler

  /**
   * Repaints the lead selection row when focus is lost/grained.
   */
  public class FocusHandler
    implements FocusListener
  {
    /**
     * Constructor
     */
    public FocusHandler()
    {
      // Nothing to do here.
    }

    /**
     * Invoked when focus is activated on the tree we're in, redraws the lead
     * row. Invoked when a component gains the keyboard focus.
     * 
     * @param e
     *          is the focus event that is activated
     */
    public void focusGained(FocusEvent e)
    {
      // TODO: Implement this properly.
    }

    /**
     * Invoked when focus is deactivated on the tree we're in, redraws the lead
     * row. Invoked when a component loses the keyboard focus.
     * 
     * @param e
     *          is the focus event that is deactivated
     */
    public void focusLost(FocusEvent e)
    {
      // TODO: Implement this properly.
    }
  }

  /**
   * This is used to get multiple key down events to appropriately genereate
   * events.
   */
  public class KeyHandler
    extends KeyAdapter
  {
    /** Key code that is being generated for. */
    protected Action repeatKeyAction;

    /** Set to true while keyPressed is active */
    protected boolean isKeyDown;

    /**
     * Constructor
     */
    public KeyHandler()
    {
      // Nothing to do here.
    }

    /**
     * Invoked when a key has been typed. Moves the keyboard focus to the first
     * element whose first letter matches the alphanumeric key pressed by the
     * user. Subsequent same key presses move the keyboard focus to the next
     * object that starts with the same letter.
     * 
     * @param e
     *          the key typed
     */
    public void keyTyped(KeyEvent e)
    {
      // TODO: What should be done here, if anything?
    }

    /**
     * Invoked when a key has been pressed.
     * 
     * @param e
     *          the key pressed
     */
    public void keyPressed(KeyEvent e)
    {
      // TODO: What should be done here, if anything?
    }

    /**
     * Invoked when a key has been released
     * 
     * @param e
     *          the key released
     */
    public void keyReleased(KeyEvent e)
    {
      // TODO: What should be done here, if anything?
    }
  }

  /**
   * MouseListener is responsible for updating the selection based on mouse
   * events.
   */
  public class MouseHandler extends MouseAdapter implements MouseMotionListener
  {
    /**
     * Constructor
     */
    public MouseHandler()
    {
      // Nothing to do here.
    }

    /**
     * Invoked when a mouse button has been pressed on a component.
     * 
     * @param e
     *          is the mouse event that occured
     */
    public void mousePressed(MouseEvent e)
    {
      Point click = e.getPoint();
      TreePath path = getClosestPathForLocation(tree, click.x, click.y);

      if (path != null)
        {
          Rectangle bounds = getPathBounds(tree, path);
          int row = getRowForPath(tree, path);
          boolean cntlClick = isLocationInExpandControl(path, click.x, click.y);

          boolean isLeaf = isLeaf(row);
          
          TreeCellRenderer tcr = getCellRenderer();
          Icon icon;
          if (isLeaf)
            icon = UIManager.getIcon("Tree.leafIcon");
          else if (tree.isExpanded(path))
            icon = UIManager.getIcon("Tree.openIcon");
          else
            icon = UIManager.getIcon("Tree.closedIcon");
          
          if (tcr instanceof DefaultTreeCellRenderer)
            {
             Icon tmp = ((DefaultTreeCellRenderer) tcr).getIcon();
             if (tmp != null)
               icon = tmp;
            }
          
          // add gap*2 for the space before and after the text
          if (icon != null)
            bounds.width += icon.getIconWidth() + gap*2;

          boolean inBounds = bounds.contains(click.x, click.y);
          if ((inBounds || cntlClick) && tree.isVisible(path))
            {
              if (inBounds)
                {
                  selectPath(tree, path);
                  if (e.getClickCount() == 2 && !isLeaf(row))
                      toggleExpandState(path);
                }
              
              if (cntlClick)
                {
                  handleExpandControlClick(path, click.x, click.y);
                  if (cellEditor != null)
                    cellEditor.cancelCellEditing();
                  tree.scrollPathToVisible(path);
                }
              else if (tree.isEditable())
                startEditing(path, e);
            }
        }
    }

    /**
     * Invoked when a mouse button is pressed on a component and then dragged.
     * MOUSE_DRAGGED events will continue to be delivered to the component where
     * the drag originated until the mouse button is released (regardless of
     * whether the mouse position is within the bounds of the component).
     * 
     * @param e
     *          is the mouse event that occured
     */
    public void mouseDragged(MouseEvent e)
    {
      // TODO: What should be done here, if anything?
    }

    /**
     * Invoked when the mouse button has been moved on a component (with no
     * buttons no down).
     *