basictableui.java

来自「linux下建立JAVA虚拟机的源码KAFFE」· Java 代码 · 共 1,330 行 · 第 1/4 页

     * @param eventIsTab true if TAB was pressed, false if ENTER pressed
     */
    void advanceMultipleSelection (ListSelectionModel firstModel, int firstMin,
                                   int firstMax, ListSelectionModel secondModel, 
                                   int secondMin, int secondMax, boolean reverse,
                                   boolean eventIsTab)
    {
      // If eventIsTab, all the "firsts" correspond to columns, otherwise, to rows
      // "seconds" correspond to the opposite
      int firstLead = firstModel.getLeadSelectionIndex();
      int secondLead = secondModel.getLeadSelectionIndex();
      int numFirsts = eventIsTab ? 
        table.getModel().getColumnCount() : table.getModel().getRowCount();
      int numSeconds = eventIsTab ? 
        table.getModel().getRowCount() : table.getModel().getColumnCount();

      // check if we have to wrap the "firsts" around, going to the other side
      if ((firstLead == firstMax && !reverse) || 
          (reverse && firstLead == firstMin))
        {
          firstModel.addSelectionInterval(reverse ? firstMax : firstMin, 
                                          reverse ? firstMax : firstMin);
          
          // check if we have to wrap the "seconds"
          if ((secondLead == secondMax && !reverse) || 
              (reverse && secondLead == secondMin))
            secondModel.addSelectionInterval(reverse ? secondMax : secondMin, 
                                             reverse ? secondMax : secondMin);

          // if we're not wrapping the seconds, we have to find out where we
          // are within the secondModel and advance to the next cell (or 
          // go back to the previous cell if reverse == true)
          else
            {
              int[] secondsSelected;
              if (eventIsTab && table.getRowSelectionAllowed() || 
                  !eventIsTab && table.getColumnSelectionAllowed())
                secondsSelected = eventIsTab ? 
                  table.getSelectedRows() : table.getSelectedColumns();
              else
                {
                  // if row selection is not allowed, then the entire column gets
                  // selected when you click on it, so consider ALL rows selected
                  secondsSelected = new int[numSeconds];
                  for (int i = 0; i < numSeconds; i++)
                  secondsSelected[i] = i;
                }

              // and now find the "next" index within the model
              int secondIndex = reverse ? secondsSelected.length - 1 : 0;
              if (!reverse)
                while (secondsSelected[secondIndex] <= secondLead)
                  secondIndex++;
              else
                while (secondsSelected[secondIndex] >= secondLead)
                  secondIndex--;
              
              // and select it - updating the lead selection index
              secondModel.addSelectionInterval(secondsSelected[secondIndex], 
                                               secondsSelected[secondIndex]);
            }
        }
      // We didn't have to wrap the firsts, so just find the "next" first
      // and select it, we don't have to change "seconds"
      else
        {
          int[] firstsSelected;
          if (eventIsTab && table.getColumnSelectionAllowed() || 
              !eventIsTab && table.getRowSelectionAllowed())
            firstsSelected = eventIsTab ? 
              table.getSelectedColumns() : table.getSelectedRows();
          else
            {
              // if selection not allowed, consider ALL firsts to be selected
              firstsSelected = new int[numFirsts];
              for (int i = 0; i < numFirsts; i++)
                firstsSelected[i] = i;
            }
          int firstIndex = reverse ? firstsSelected.length - 1 : 0;
          if (!reverse)
            while (firstsSelected[firstIndex] <= firstLead)
              firstIndex++;
          else 
            while (firstsSelected[firstIndex] >= firstLead)
              firstIndex--;
          firstModel.addSelectionInterval(firstsSelected[firstIndex], 
                                          firstsSelected[firstIndex]);
          secondModel.addSelectionInterval(secondLead, secondLead);
        }
    }
    
    /** 
     * A helper method for the key  bindings. Used because the actions
     * for TAB, SHIFT-TAB, ENTER, and SHIFT-ENTER are very similar.
     *
     * Selects the next (previous if SHIFT pressed) column (TAB) or row (ENTER)
     * in the table, changing the current selection.  All cells in the table
     * are eligible, not just the ones that are currently selected.
     * @param firstModel the ListSelectionModel for columns (TAB) or rows
     * (ENTER)
     * @param firstMax the last index in firstModel
     * @param secondModel the ListSelectionModel for rows (TAB) or columns
     * (ENTER)
     * @param secondMax the last index in secondModel
     * @param reverse true if SHIFT was pressed for the event
     */

    void advanceSingleSelection (ListSelectionModel firstModel, int firstMax, 
                                 ListSelectionModel secondModel, int secondMax, 
                                 boolean reverse)
    {
      // for TABs, "first" corresponds to columns and "seconds" to rows.
      // the opposite is true for ENTERs
      int firstLead = firstModel.getLeadSelectionIndex();
      int secondLead = secondModel.getLeadSelectionIndex();
      
      // if we are going backwards subtract 2 because we later add 1
      // for a net change of -1
      if (reverse && (firstLead == 0))
        {
          // check if we have to wrap around
          if (secondLead == 0)
            secondLead += secondMax + 1;
          secondLead -= 2;
        }
      
      // do we have to wrap the "seconds"?
      if (reverse && (firstLead == 0) || !reverse && (firstLead == firstMax))
        secondModel.setSelectionInterval((secondLead + 1)%(secondMax + 1), 
                                         (secondLead + 1)%(secondMax + 1));
      // if not, just reselect the current lead
      else
        secondModel.setSelectionInterval(secondLead, secondLead);
      
      // if we are going backwards, subtract 2  because we add 1 later
      // for net change of -1
      if (reverse)
        {
          // check for wraparound
          if (firstLead == 0)
            firstLead += firstMax + 1;
          firstLead -= 2;
        }
      // select the next "first"
      firstModel.setSelectionInterval ((firstLead + 1)%(firstMax + 1), 
                                       (firstLead + 1)%(firstMax + 1));
    }
  }

  protected void installListeners() 
  {
    if (focusListener == null)
      focusListener = createFocusListener();
    table.addFocusListener(focusListener);
    if (keyListener == null)
      keyListener = createKeyListener();
    table.addKeyListener(keyListener);
    if (mouseInputListener == null)
      mouseInputListener = createMouseInputListener();
    table.addMouseListener(mouseInputListener);    
    table.addMouseMotionListener(mouseInputListener);
    if (propertyChangeListener == null)
      propertyChangeListener = new PropertyChangeHandler();
    table.addPropertyChangeListener(propertyChangeListener);
  }

  protected void uninstallDefaults() 
  {
    // TODO: this method used to do the following which is not
    // quite right (at least it breaks apps that run fine with the
    // JDK):
    //
    // table.setFont(null);
    // table.setGridColor(null);
    // table.setForeground(null);
    // table.setBackground(null);
    // table.setSelectionForeground(null);
    // table.setSelectionBackground(null);
    //
    // This would leave the component in a corrupt state, which is
    // not acceptable. A possible solution would be to have component
    // level defaults installed, that get overridden by the UI defaults
    // and get restored in this method. I am not quite sure about this
    // though. / Roman Kennke
  }

  protected void uninstallKeyboardActions() 
  {
    // TODO: Implement this properly.
  }

  protected void uninstallListeners() 
  {
    table.removeFocusListener(focusListener);  
    table.removeKeyListener(keyListener);
    table.removeMouseListener(mouseInputListener);    
    table.removeMouseMotionListener(mouseInputListener);
    table.removePropertyChangeListener(propertyChangeListener);
    propertyChangeListener = null;
  }

  public void installUI(JComponent comp) 
  {
    table = (JTable)comp;
    installDefaults();
    installKeyboardActions();
    installListeners();
  }

  public void uninstallUI(JComponent c) 
  {
    uninstallListeners();
    uninstallKeyboardActions();
    uninstallDefaults();    
  }

  /**
   * Paints a single cell in the table.
   *
   * @param g The graphics context to paint in
   * @param row The row number to paint
   * @param col The column number to paint
   * @param bounds The bounds of the cell to paint, assuming a coordinate
   * system beginning at <code>(0,0)</code> in the upper left corner of the
   * table
   * @param rend A cell renderer to paint with
   */
  void paintCell(Graphics g, int row, int col, Rectangle bounds,
                 TableCellRenderer rend)
  {
    Component comp = table.prepareRenderer(rend, row, col);
    rendererPane.paintComponent(g, comp, table, bounds);
  }
  
  /**
   * Paint the associated table.
   */
  public void paint(Graphics gfx, JComponent ignored) 
  {
    int ncols = table.getColumnCount();
    int nrows = table.getRowCount();
    if (nrows == 0 || ncols == 0)
      return;

    Rectangle clip = gfx.getClipBounds();

    // Determine the range of cells that are within the clip bounds.
    Point p1 = new Point(clip.x, clip.y);
    int c0 = table.columnAtPoint(p1);
    if (c0 == -1)
      c0 = 0;
    int r0 = table.rowAtPoint(p1);
    if (r0 == -1)
      r0 = 0;
    Point p2 = new Point(clip.x + clip.width, clip.y + clip.height);
    int cn = table.columnAtPoint(p2);
    if (cn == -1)
      cn = table.getColumnCount() - 1;
    int rn = table.rowAtPoint(p2);
    if (rn == -1)
      rn = table.getRowCount() - 1;

    TableColumnModel cmodel = table.getColumnModel();
    int [] widths = new int[cn+1];
    for (int i = c0; i <=cn ; i++)
      {
        widths[i] = cmodel.getColumn(i).getWidth();
      }
    
    Rectangle bounds = table.getCellRect(r0, c0, false);
    bounds.height = table.getRowHeight()+table.getRowMargin();
    
    // The left boundary of the area being repainted.
    int left = bounds.x;
    
    // The top boundary of the area being repainted.
    int top = bounds.y;
    
    // The bottom boundary of the area being repainted.
    int bottom;
    
    // The cell height.
    int height = bounds.height;
    
    // paint the cell contents
    Color grid = table.getGridColor();    
    for (int r = r0; r <= rn; ++r)
      {
        for (int c = c0; c <= cn; ++c)
          {
            bounds.width = widths[c];
            paintCell(gfx, r, c, bounds, table.getCellRenderer(r, c));
            bounds.x += widths[c];
          }
        bounds.y += height;
        bounds.x = left;
      }
    
    bottom = bounds.y;

    // paint vertical grid lines
    if (grid != null && table.getShowVerticalLines())
      {    
        Color save = gfx.getColor();
        gfx.setColor(grid);
        int x = left;
        
        for (int c = c0; c <= cn; ++c)
          {
            gfx.drawLine(x, top, x, bottom);
            x += widths[c];
          }
        gfx.setColor(save);
      }

    // paint horizontal grid lines    
    if (grid != null && table.getShowHorizontalLines())
      {    
        Color save = gfx.getColor();
        gfx.setColor(grid);
        int y = top;
        for (int r = r0; r <= rn; ++r)
          {
            gfx.drawLine(left, y, p2.x, y);
            y += height;
          }
        gfx.setColor(save);
      }
  }
}