JTreeのノード選択可能な領域を行全体に拡張する

class WholeRowSelectableTreeUI extends BasicTreeUI {
  @Override public void paint(Graphics g, JComponent c) {
    // @see javax/swing/plaf/synth/SynthTreeUI#paint(SynthContext, Graphics)
  }

  @Override protected void paintRow(...) {
    // @see javax/swing/plaf/basic/BasicTreeUI#paintRow(...)
  }

  @Override protected MouseListener createMouseListener() {
    return new MouseHandler() {
      @Override public void mousePressed(MouseEvent e) {
        super.mousePressed(convertMouseEvent(e));
      }

      @Override public void mouseReleased(MouseEvent e) {
        super.mouseReleased(convertMouseEvent(e));
      }

      @Override public void mouseDragged(MouseEvent e) {
        super.mouseDragged(convertMouseEvent(e));
      }

      private MouseEvent convertMouseEvent(MouseEvent e) {
        if (!tree.isEnabled()
            || !SwingUtilities.isLeftMouseButton(e)
            || e.isConsumed()) {
          return e;
        }

        int x = e.getX();
        int y = e.getY();
        TreePath path = getClosestPathForLocation(tree, x, y);
        if (path == null || isLocationInExpandControl(path, x, y)) {
          return e;
        }

        Rectangle bounds = getPathBounds(tree, path);
        int newX = (int) bounds.getCenterX();
        bounds.x = 0;
        bounds.width = tree.getWidth();
        if (bounds.contains(e.getPoint())) {
          return new MouseEvent(
              e.getComponent(), e.getID(),
              e.getWhen(), e.getModifiersEx(), newX, e.getY(),
              e.getClickCount(), e.isPopupTrigger(), e.getButton());
        } else {
          return e;
        }
      }
    };
  }
}