JTableのセルにHyperlinkを表示

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概要

JTableのセルの中に、Hyperlinkを表示します。

Screenshot

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サンプルコード

class URLRenderer extends DefaultTableCellRenderer implements MouseInputListener {
  private int row = -1;
  private int col = -1;
  @Override public Component getTableCellRendererComponent(
      JTable table, Object value,
      boolean isSelected, boolean hasFocus, int row, int column) {
    super.getTableCellRendererComponent(
        table, value, isSelected, false, row, column);
    if (!table.isEditing() && this.row == row && this.col == column) {
      setText("<html><u><font color='blue'>" + value.toString());
    } else if (hasFocus) {
      setText("<html><font color='blue'>" + value.toString());
    } else {
      setText(value.toString());
    }
    return this;
  }

  @Override public void mouseMoved(MouseEvent e) {
    JTable table = (JTable) e.getSource();
    Point pt = e.getPoint();
    row = table.rowAtPoint(pt);
    col = table.columnAtPoint(pt);
    if (row < 0 || col < 0) {
      row = -1;
      col = -1;
    }
    table.repaint();
  }

  @Override public void mouseExited(MouseEvent e)  {
    JTable table = (JTable) e.getSource();
    row = -1;
    col = -1;
    table.repaint();
  }

  @Override public void mouseClicked(MouseEvent e) {
    JTable table = (JTable) e.getSource();
    Point pt = e.getPoint();
    int crow = table.rowAtPoint(pt);
    int ccol = table.columnAtPoint(pt);
    // if (table.convertColumnIndexToModel(ccol) == 2)
    if (table.getColumnClass(ccol).equals(URL.class)) {
      URL url = (URL) table.getValueAt(crow, ccol);
      System.out.println(url);
      try {
        Desktop.getDesktop().browse(url.toURI());
      } catch (Exception ex) {
        ex.printStackTrace();
      }
    }
  }

  @Override public void mouseDragged(MouseEvent e) {
    /* not needed */
  }

  @Override public void mouseEntered(MouseEvent e) {
    /* not needed */
  }

  @Override public void mousePressed(MouseEvent e) {
    /* not needed */
  }

  @Override public void mouseReleased(MouseEvent e) {
    /* not needed */
  }
}
View in GitHub: Java, Kotlin

解説

上記のサンプルでは、JTableのセル内にリンクを表現するためにhtmlタグを使って文字列を修飾するセルレンダラーを作成して使用しています。

URLRenderer renderer = new URLRenderer();
table.setDefaultRenderer(URL.class, renderer);
table.addMouseListener(renderer);
table.addMouseMotionListener(renderer);

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