defaulttablecolumnmodel.java

gcc的组建

  /**
   * getSelectionModel returns selection model
   * @return ListSelectionModel selection model
   */
  public ListSelectionModel getSelectionModel()
  {
    return selectionModel;
  }

  /**
   * setColumnSelectionAllowed sets whether column selection is allowed
   * or not.
   *
   * @param flag true if column selection is allowed and false otherwise
   */
  public void setColumnSelectionAllowed(boolean flag)
  {
    columnSelectionAllowed = flag;
  }

  /**
   * getColumnSelectionAllowed indicates whether column selection is 
   * allowed or not.
   *
   * @return boolean true if column selection is allowed and false otherwise.
   */
  public boolean getColumnSelectionAllowed()
  {
    return columnSelectionAllowed;
  }

  /**
   * getSelectedColumns returns array containing indexes of currently 
   * selected columns
   *
   * @return int[] array containing indexes of currently selected columns
   */
  public int[] getSelectedColumns()
  {
    // FIXME: Implementation of this method was taken from private method 
    // JTable.getSelections(), which is used in various places in JTable
    // including selected row calculations and cannot be simply removed.
    // This design should be improved to illuminate duplication of code.
    
    ListSelectionModel lsm = this.selectionModel;    
    int sz = getSelectedColumnCount();
    int [] ret = new int[sz];

    int lo = lsm.getMinSelectionIndex();
    int hi = lsm.getMaxSelectionIndex();
    int j = 0;
    java.util.ArrayList ls = new java.util.ArrayList();
    if (lo != -1 && hi != -1)
      {
        switch (lsm.getSelectionMode())
          {
          case ListSelectionModel.SINGLE_SELECTION:
            ret[0] = lo;
            break;      
      
          case ListSelectionModel.SINGLE_INTERVAL_SELECTION:            
            for (int i = lo; i <= hi; ++i)
              ret[j++] = i;
            break;
            
          case ListSelectionModel.MULTIPLE_INTERVAL_SELECTION:        
            for (int i = lo; i <= hi; ++i)
              if (lsm.isSelectedIndex(i))        
                ret[j++] = i;
            break;
          }
      }
    return ret;
  }

  /**
   * getSelectedColumnCount returns number of currently selected columns
   * @return int number of currently selected columns
   */
  public int getSelectedColumnCount()
  {
    // FIXME: Implementation of this method was taken from private method 
    // JTable.countSelections(), which is used in various places in JTable
    // including selected row calculations and cannot be simply removed.
    // This design should be improved to illuminate duplication of code.
   
    ListSelectionModel lsm = this.selectionModel;
    int lo = lsm.getMinSelectionIndex();
    int hi = lsm.getMaxSelectionIndex();
    int sum = 0;
    
    if (lo != -1 && hi != -1)
      {
        switch (lsm.getSelectionMode())
          {
          case ListSelectionModel.SINGLE_SELECTION:
            sum = 1;
            break;
            
          case ListSelectionModel.SINGLE_INTERVAL_SELECTION:
            sum = hi - lo + 1;
            break;
            
          case ListSelectionModel.MULTIPLE_INTERVAL_SELECTION:        
            for (int i = lo; i <= hi; ++i)
              if (lsm.isSelectedIndex(i))        
                ++sum;
            break;
          }
      }
     
     return sum;
  }

  /**
   * addColumnModelListener adds specified listener to the model's
   * listener list
   *
   * @param listener the listener to add
   */
  public void addColumnModelListener(TableColumnModelListener listener)
  {
    listenerList.add(TableColumnModelListener.class, listener);
  }

  /**
   * removeColumnModelListener removes specified listener from the model's 
   * listener list.
   *
   * @param listener the listener to remove
   */
  public void removeColumnModelListener(TableColumnModelListener listener)
  {
    listenerList.remove(TableColumnModelListener.class, listener);
  }

  /**
   * @since 1.4
   */
  public TableColumnModelListener[] getColumnModelListeners()
  {
    return (TableColumnModelListener[])
      listenerList.getListeners(TableColumnModelListener.class);
  }	  

  /**
   * fireColumnAdded fires TableColumnModelEvent to registered 
   * TableColumnModelListeners to indicate that column was added
   *
   * @param e TableColumnModelEvent
   */
  protected void fireColumnAdded(TableColumnModelEvent e)
  {    
    TableColumnModelListener[] listeners = getColumnModelListeners();

    for (int i=0; i< listeners.length; i++)
      listeners[i].columnAdded(e);        
  }

  /**
   * fireColumnAdded fires TableColumnModelEvent to registered 
   * TableColumnModelListeners to indicate that column was removed
   *
   * @param e TableColumnModelEvent
   */
  protected void fireColumnRemoved(TableColumnModelEvent e)
  {
    TableColumnModelListener[] listeners = getColumnModelListeners();

    for (int i=0; i< listeners.length; i++)
      listeners[i].columnRemoved(e);        
  }

  /**
   * fireColumnAdded fires TableColumnModelEvent to registered 
   * TableColumnModelListeners to indicate that column was moved
   *
   * @param e TableColumnModelEvent
   */
  protected void fireColumnMoved(TableColumnModelEvent e)
  {
    TableColumnModelListener[] listeners = getColumnModelListeners();

    for (int i=0; i< listeners.length; i++)
      listeners[i].columnMoved(e);        
  }

  /**
   * fireColumnSelectionChanged fires TableColumnModelEvent to model's
   * registered TableColumnModelListeners to indicate that different column 
   * was selected.
   *
   * @param evt ListSelectionEvent
   */
  protected void fireColumnSelectionChanged(ListSelectionEvent evt)
  {
    EventListener [] listeners = getListeners(TableColumnModelListener.class);
    for (int i = 0; i < listeners.length; ++i)
      ((TableColumnModelListener)listeners[i]).columnSelectionChanged(evt);
  }

  /**
   * fireColumnMarginChanged fires TableColumnModelEvent to model's
   * registered TableColumnModelListeners to indicate that column margin
   * was changed.
   */
  protected void fireColumnMarginChanged()
  {
    EventListener [] listeners = getListeners(TableColumnModelListener.class);
    for (int i = 0; i < listeners.length; ++i)
      ((TableColumnModelListener)listeners[i]).columnMarginChanged(changeEvent);
  }

  /**
   * getListeners returns currently registered listeners with this model.
   * @param listenerType type of listeners to return
   *
   * @return EventListener[] array of model's listeners of the specified type
   */
  public EventListener[] getListeners(Class listenerType)
  {
    return listenerList.getListeners(listenerType);
  }

  /**
   * propertyChange handles changes occuring in the properties of the
   * model's columns. 
   *
   * @param evt PropertyChangeEvent
   */
  public void propertyChange(PropertyChangeEvent evt)
  {
    if (evt.getPropertyName().equals(TableColumn.COLUMN_WIDTH_PROPERTY))
	invalidateWidthCache(); 
  }

  /**
   * valueChanged handles changes in the selectionModel.
   * @param e ListSelectionEvent
   */
  public void valueChanged(ListSelectionEvent e)
  {
    fireColumnSelectionChanged(e);
  }

  /**
   * createSelectionModel creates selection model that will keep track
   * of currently selected column(s)
   *
   * @return ListSelectionModel selection model of the columns
   */
  protected ListSelectionModel createSelectionModel()
  {    
    return new DefaultListSelectionModel();
  }

  /**
   * recalcWidthCache calculates total width of the columns.
   * If the current cache of the total width is in invalidated state, 
   * then width is recalculated. Otherwise nothing is done.
   */
  protected void recalcWidthCache()
  {
    if (totalColumnWidth == -1)
      {
        totalColumnWidth = 0;
        for (int i = 0; i < tableColumns.size(); ++i)
          {
            totalColumnWidth += ((TableColumn)tableColumns.get(i)).getWidth();
          }
      }
  }

  /**
   * invalidateWidthCache
   */
  private void invalidateWidthCache()
  {
    totalColumnWidth = -1;
  }
}