Swing/ClippedCellTooltips のバックアップの現在との差分(No.3)

JTableのセルがクリップされている場合のみJToolTipを表示

サンプルコード

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* サンプルコード [#sourcecode]
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#code(link){{
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class ToolTipHeaderRenderer implements TableCellRenderer {
  private final TableCellRenderer renderer;
  private final Icon icon = UIManager.getIcon("Table.ascendingSortIcon");
  public ToolTipHeaderRenderer(TableCellRenderer renderer) {
    this.renderer = renderer;
  }
  public Component getTableCellRendererComponent(JTable table,Object value,
          boolean isSelected, boolean hasFocus, int row, int column) {
    JLabel l = (JLabel)renderer.getTableCellRendererComponent(
      table, value, isSelected, hasFocus, row, column);
    Insets i = l.getInsets();
    Rectangle rect = table.getCellRect(row, column, false);
    rect.width -= i.left + i.right;
    RowSorter<? extends TableModel> sorter = table.getRowSorter();
    if(sorter!=null && !sorter.getSortKeys().isEmpty()
                    && sorter.getSortKeys().get(0).getColumn()==column) {
      rect.width -= icon.getIconWidth() + 2; //XXX
  // private final Icon icon = UIManager.getIcon("Table.ascendingSortIcon");
  @Override public Component getTableCellRendererComponent(JTable table,
      Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    JTableHeader header = table.getTableHeader();
    TableCellRenderer r = header.getDefaultRenderer();
    Component c = r.getTableCellRendererComponent(
        table, value, isSelected, hasFocus, row, column);
    if (c instanceof JLabel) {
      JLabel l = (JLabel) c;
      Insets i = l.getInsets();
      Rectangle rect = header.getHeaderRect(column);
      rect.width -= i.left + i.right;
      boolean isClipped = isClipped(l, rect);
      // isClipped = fontMetrics.stringWidth(l.getText()) > rect.width;
      l.setToolTipText(isClipped ? l.getText() : header.getToolTipText());
    }
    FontMetrics fm = l.getFontMetrics(l.getFont());
    String str = value.toString();
    int cellTextWidth = fm.stringWidth(str);
    l.setToolTipText(cellTextWidth>rect.width?str:null);
    return l;
    return c;
  }
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  private static boolean isClipped(JLabel label, Rectangle viewR) {
    Rectangle iconR = new Rectangle();
    Rectangle textR = new Rectangle();
    String str = SwingUtilities.layoutCompoundLabel(
        label,
        label.getFontMetrics(label.getFont()),
        label.getText(),
        label.getIcon(),
        label.getVerticalAlignment(),
        label.getHorizontalAlignment(),
        label.getVerticalTextPosition(),
        label.getHorizontalTextPosition(),
        viewR,
        iconR,
        textR,
        label.getIconTextGap());
    return !Objects.equals(label.getText(), str);
  }
}

• ヘッダセル
  • TableCellRendererで、セルの幅と文字列の長さを比較して、ToolTipを設定
  • ソートアイコンと文字列の間のgapが不明?

解説

参考リンク

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