tableview.java

linux下建立JAVA虚拟机的源码KAFFE

     *
     * @deprecated Table cells are now rendered by an arbitrary
     *             <code>View</code> implementation.
     */
    public int getRowCount()
    {
      // TODO: Figure out if this is right. However, this is not so important
      // since this class isn't used anyway (except maybe be application code
      // that still uses this deprecated class).
      return 1;
    }

    /**
     * Sets the grid location of this table cell.
     *
     * @param r the row of this cell
     * @param c the column of this cell
     *
     * @deprecated Table cells are now rendered by an arbitrary
     *             <code>View</code> implementation.
     */
    public void setGridLocation(int r, int c)
    {
      row = r;
      column = c;
    }

    /**
     * Returns the row number of this cell.
     *
     * @return the row number of this cell
     *
     * @deprecated Table cells are now rendered by an arbitrary
     *             <code>View</code> implementation.
     */
    public int getGridRow()
    {
      return row;
    }

    /**
     * Returns the column number of this cell.
     *
     * @return the column number of this cell
     *
     * @deprecated Table cells are now rendered by an arbitrary
     *             <code>View</code> implementation.
     */
    public int getGridColumn()
    {
      return column;
    }
  }

  /**
   * The offsets of the columns of this table. Package private to avoid
   * synthetic accessor methods.
   */
  int[] columnOffsets;

  /**
   * The spans of the columns of this table. Package private to avoid
   * synthetic accessor methods.
   */
  int[] columnSpans;

  /**
   * The size requirements of the columns.
   */
  SizeRequirements[] columnRequirements = new SizeRequirements[0];

  /**
   * Creates a new instance of <code>TableView</code>.
   *
   * @param el the element for which to create a table view
   */
  public TableView(Element el)
  {
    super(el, Y_AXIS);
  }

  /**
   * Replaces a number of child views with a set of new child views. This is
   * implemented to call the superclass behaviour and invalidate the layout.
   *
   * @param offset the offset at which to replace child views
   * @param length the number of child views to remove
   * @param views the new set of views
   */
  public void replace(int offset, int length, View[] views)
  {
    super.replace(offset, length, views);
    layoutChanged(Y_AXIS);
  }

  /**
   * Creates a view for a table row.
   *
   * @param el the element that represents the table row
   *
   * @return a view for rendering the table row
   */
  protected TableRow createTableRow(Element el)
  {
    return new TableRow(el);
  }

  /**
   * Creates a view for a table cell. This method is deprecated and not used
   * anymore.
   *
   * @param el the element that represents the table cell
   *
   * @return a view for rendering the table cell
   *
   * @deprecated Table cells are now rendered by an arbitrary
   *             <code>View</code> implementation.
   */
  protected TableCell createTableCell(Element el)
  {
    return new TableCell(el);
  }

  protected void forwardUpdate(DocumentEvent.ElementChange ec, DocumentEvent e,
                               Shape a, ViewFactory vf)
  {
    // TODO: Figure out what to do here.
  }

  /**
   * Lays out the columns to fit within the specified target span.
   *
   * @param targetSpan the total span for the columns
   * @param offsets an array that holds the offsets of the columns when this
   *        method returns
   * @param spans an array that holds the spans of the columns when this method
   *        returns
   * @param reqs the size requirements for each column
   */
  protected void layoutColumns(int targetSpan, int[] offsets, int spans[],
                               SizeRequirements[] reqs)
  {
    updateColumnRequirements();
    SizeRequirements r = calculateMinorAxisRequirements(X_AXIS, null);
    SizeRequirements.calculateTiledPositions(targetSpan, r, columnRequirements,
                                             offsets, spans);
  }

  /**
   * Lays out the child views along the minor axis of the table (that is the
   * horizontal axis). This is implemented to call {@link #layoutColumns} to
   * layout the column layout of this table, and then forward to the superclass
   * to actually lay out the rows.
   *
   * @param targetSpan the available span along the minor (horizontal) axis
   * @param axis the axis
   * @param offsets an array that holds the offsets of the columns when this
   *        method returns
   * @param spans an array that holds the spans of the columns when this method
   *        returns
   */
  protected void layoutMinorAxis(int targetSpan, int axis, int[] offsets,
                                 int[] spans)
  {
    // TODO: Prepare size requirements for the columns.
    layoutColumns(targetSpan, columnOffsets, columnSpans, columnRequirements);
    super.layoutMinorAxis(targetSpan, axis, offsets, spans);
  }

  /**
   * Calculates the requirements of this view for the minor (== horizontal)
   * axis.
   * 
   * This is reimplemented to calculate the requirements as the sum of the
   * size requirements of the columns.
   *
   * @param axis the axis
   * @param req the size requirements object to use, if <code>null</code> a new
   *        one will be created
   */
  protected SizeRequirements calculateMinorAxisRequirements(int axis,
                                                            SizeRequirements req)
  {
    // TODO: Maybe prepare columnRequirements.
    SizeRequirements res = req;
    if (res == null)
      res = new SizeRequirements();
    else
      {
        res.alignment = 0.5f;
        res.maximum = 0;
        res.minimum = 0;
        res.preferred = 0;
      }

    for (int i = 0; i < columnRequirements.length; ++i)
      {
        res.minimum += columnRequirements[i].minimum;
        res.preferred += columnRequirements[i].preferred;
        res.maximum += columnRequirements[i].maximum;
        // TODO: Do we have to handle alignment somehow?
      }
    return res;
  }

  /**
   * Returns the child view that represents the specified position in the
   * model. This is reimplemented because in this view we do not necessarily
   * have a one to one mapping of child elements to child views.
   *
   * @param pos the model position for which to query the view
   * @param a the allocation of this view
   *
   * @return the view that corresponds to the specified model position or
   *         <code>null</code> if there is none
   */
  protected View getViewAtPosition(int pos, Rectangle a)
  {
    // FIXME: Do not call super here. Instead walk through the child views
    // and look for a range that contains the given position.
    return super.getViewAtPosition(pos, a);
  }

  /**
   * Updates the column requirements.
   */
  private void updateColumnRequirements()
  {
    int rowCount = getViewCount();
    for (int r = 0; r < rowCount; ++r)
      {
        TableRow row = (TableRow) getView(r);
        int columnCount = row.getViewCount();
        for (int c = 0; c < columnCount; ++c)
          {
            View cell = row.getView(c);
            SizeRequirements cr = columnRequirements[c];
            cr.minimum = Math.max(cr.minimum, (int) cell.getMinimumSpan(X_AXIS));
            cr.preferred = Math.max(cr.preferred,
                                    (int) cell.getPreferredSpan(X_AXIS));
            cr.maximum = Math.max(cr.maximum, (int) cell.getMaximumSpan(X_AXIS));
          }
      }
  }
}