JTableのセルにHyperlinkを表示

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Summary

JTableのセルの中に、Hyperlinkを表示します。

Screenshot

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Source Code Examples

class UriRenderer extends DefaultTableCellRenderer implements MouseListener, MouseMotionListener {
  private int viewRowIndex = -1;
  private int viewColumnIndex = -1;
  private boolean isRollover;

  @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    Component c = super.getTableCellRendererComponent(
        table, value, isSelected, false, row, column);
    if (c instanceof JLabel) {
      JLabel l = (JLabel) c;
      // @see https://ateraimemo.com/Swing/ClippedHtmlLabel.html
      // String str = SwingUtilities.layoutCompoundLabel(...);
      String str = Objects.toString(value, "");
      if (isRolloverCell(table, row, column)) {
        l.setText("<html><u><font color='blue'>" + str);
      } else if (hasFocus) {
        l.setText("<html><font color='blue'>" + str);
      } else {
        l.setText(str);
      }
    }
    return c;
  }

  protected boolean isRolloverCell(JTable table, int row, int column) {
    return !table.isEditing() && viewRowIndex == row && viewColumnIndex == column && isRollover;
  }

  private static boolean isUriColumn(JTable table, int column) {
    return column >= 0 && table.getColumnClass(column).equals(URI.class);
  }

  @Override public void mouseMoved(MouseEvent e) {
    JTable table = (JTable) e.getComponent();
    Point pt = e.getPoint();
    int prevRow = viewRowIndex;
    int prevCol = viewColumnIndex;
    viewRowIndex = table.rowAtPoint(pt);
    viewColumnIndex = table.columnAtPoint(pt);
    boolean isSameCell = viewRowIndex == prevRow && viewColumnIndex == prevCol;

    boolean prevRollover = isRollover;
    isRollover = isUriColumn(table, viewColumnIndex);
    boolean isNotRollover = isRollover == prevRollover && !isRollover; // && !prevRollover;

    if (isSameCell && isNotRollover) {
      return;
    }

    // >>>> HyperlinkCellRenderer.java
    // @see https://github.com/sjas/swingset3/blob/master/trunk/SwingSet3/src/com/sun/swingset3/demos/table/HyperlinkCellRenderer.java
    Rectangle repaintRect;
    if (isRollover) {
      Rectangle r = table.getCellRect(viewRowIndex, viewColumnIndex, false);
      repaintRect = prevRollover ? r.union(table.getCellRect(prevRow, prevCol, false)) : r;
    } else { // if (prevRollover) {
      repaintRect = table.getCellRect(prevRow, prevCol, false);
    }
    table.repaint(repaintRect);
    // <<<<
    // table.repaint();
  }

  @Override public void mouseExited(MouseEvent e) {
    JTable table = (JTable) e.getComponent();
    if (isUriColumn(table, viewColumnIndex)) {
      table.repaint(table.getCellRect(viewRowIndex, viewColumnIndex, false));
      viewRowIndex = -1;
      viewColumnIndex = -1;
      isRollover = false;
    }
  }

  @Override public void mouseClicked(MouseEvent e) {
    JTable table = (JTable) e.getComponent();
    Point pt = e.getPoint();
    int col = table.columnAtPoint(pt);
    if (isUriColumn(table, col)) {
      int crow = table.rowAtPoint(pt);
      URI uri = (URI) table.getValueAt(crow, col);
      // System.out.println(uri);
      try {
        // Web Start
        // BasicService bs = (BasicService) ServiceManager.lookup("javax.jnlp.BasicService");
        // bs.showDocument(uri);
        if (Desktop.isDesktopSupported()) {
          Desktop.getDesktop().browse(uri);
        }
      } catch (IOException ex) {
        // Logger.getGlobal().severe(ex::getMessage);
        UIManager.getLookAndFeel().provideErrorFeedback(e.getComponent());
      }
    }
  }

  @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

Explanation

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);

Reference

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