@Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    if (myCurrentWindow == null || myCurrentWindow.getFiles().length == 0) {
      g.setColor(UIUtil.isUnderDarcula() ? UIUtil.getBorderColor() : new Color(0, 0, 0, 50));
      g.drawLine(0, 0, getWidth(), 0);
    }

    if (showEmptyText()) {
      UIUtil.applyRenderingHints(g);
      g.setColor(new JBColor(Gray._100, Gray._160));
      g.setFont(UIUtil.getLabelFont().deriveFont(UIUtil.isUnderDarcula() ? 24f : 18f));

      final UIUtil.TextPainter painter =
          new UIUtil.TextPainter().withShadow(true).withLineSpacing(1.4f);
      painter.appendLine("No files are open").underlined(new JBColor(Gray._150, Gray._100));

      if (!isProjectViewVisible()) {
        painter
            .appendLine(
                "Open Project View with "
                    + KeymapUtil.getShortcutText(
                        new KeyboardShortcut(
                            KeyStroke.getKeyStroke((SystemInfo.isMac ? "meta" : "alt") + " 1"),
                            null)))
            .smaller()
            .withBullet();
      }

      painter
          .appendLine("Open a file by name with " + getActionShortcutText("GotoFile"))
          .smaller()
          .withBullet()
          .appendLine(
              "Open Recent files with " + getActionShortcutText(IdeActions.ACTION_RECENT_FILES))
          .smaller()
          .withBullet()
          .appendLine("Open Navigation Bar with " + getActionShortcutText("ShowNavBar"))
          .smaller()
          .withBullet()
          .appendLine("Drag'n'Drop file(s) here from " + ShowFilePathAction.getFileManagerName())
          .smaller()
          .withBullet()
          .draw(
              g,
              new PairFunction<Integer, Integer, Pair<Integer, Integer>>() {
                @Override
                public Pair<Integer, Integer> fun(Integer width, Integer height) {
                  final Dimension s = getSize();
                  return Pair.create((s.width - width) / 2, (s.height - height) / 2);
                }
              });
    }
  }
 private boolean showEmptyText() {
   return myCurrentWindow == null || myCurrentWindow.getFiles().length == 0;
 }