sclass JFastLogView_noWrap extends JComponent implements Scrollable {

  LS lines = syncList();

  bool endsWithNewLine, verbose;

  public Dimension getPreferredScrollableViewportSize() { ret getPreferredSize(); }

  public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) { return 20; }

  public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {

    ret (direction == SwingConstants.HORIZONTAL ? visibleRect.width : visibleRect.height)*5/6;

  }

  public bool getScrollableTracksViewportWidth() { false; }

  public bool getScrollableTracksViewportHeight() { false; }

  public void paint(Graphics g) {

    //if (verbose) _print("JFastLogView_noWrap painting");

    int w = getWidth(), h = getHeight();

    g.setColor(getBackground());

    g.fillRect(0, 0, w, h);

    g.setColor(getForeground());

    FontMetrics fm = componentFontMetrics(this);

    int fh = fm.getHeight();

    Rectangle clip = g.getClipBounds();

    int start, end;

    if (clip == null) { start = 0; end = l(lines); }

    else {

      start = max(0, clip.y/fh);

      end = min(l(lines), idiv_ceil(clip.y+clip.height, fh));

    }

    //printVars(+start, +end);

    int y = fm.getAscent()+start*fh;

    for (int i = start; i < end; i++) {

      S s = get(lines, i);

      if (s != null) g.drawString(s, 0, y);

      y += fh;

    }

    //if (verbose) _print("JFastLogView_noWrap painted");

  }

  public Dimension getPreferredSize() {

    FontMetrics fm = componentFontMetrics(this);

    if (fm == null) ret new Dimension(50, 50); // not renderable yet

    int fh = fm.getHeight();

    int w = 0;

    for i over lines: {

      S s = get(lines, i);

      w = max(w, fm.stringWidth(unnull(s))); // TODO: just count chars

    }

    ret new Dimension(w, fh*l(lines));

  }

  *() {}

  *(S text) { setText(text); }

  {

    componentPopupMenuItem(this, "Copy full text", r copyFullText);

  }

  // API

  // returns true if changed

  bool setLines(Collection<S> lines) {

    LS newList = asSyncList(lines);

    if (eq(this.lines, newList)) false;

    this.lines = newList;

    _revalidate(this);

    true;

  }

  // returns true if changed

  bool setText(S text) {

    endsWithNewLine = endsWithNewLine(text);

    ret setLines(lines(text));

  }

  void append(S text) {

    if (nempty(text)) setText(getText() + text);

  }

  S getText() {

    ret lines_rtrimIf(!endsWithNewLine, cloneList(lines));

  }

  void copyFullText {

    copyTextToClipboard(getText());

  }

}