render method

@override void render(Buffer buffer, Rect area)

Renders the widget onto the provided buffer within the specified area.

Implementation

@override
void render(Buffer buffer, Rect area) {
  if (bounds.width <= 0 || bounds.height <= 0) return;

  // Render window inside parent buffer at this window's bounds.
  final absoluteBounds = Rect(
    area.x + bounds.x,
    area.y + bounds.y,
    bounds.width,
    bounds.height,
  );

  final windowViewport = Viewport(buffer, absoluteBounds);
  final w = bounds.width;
  final h = bounds.height;

  if (w < 2 || h < 2) {
    for (var y = 0; y < h; y++) {
      for (var x = 0; x < w; x++) {
        final cell = windowViewport.getCell(x, y);
        if (cell != null) {
          cell.char = ' ';
          cell.style = borderStyle;
        }
      }
    }
    return;
  }

  // Draw top border
  final topBorder =
      borderChars[0] + borderChars[1] * (w - 2) + borderChars[2];
  windowViewport.writeString(0, 0, topBorder, borderStyle);

  // Overlay title
  if (title.isNotEmpty) {
    final titleChars = title.characters;
    final maxTitleLen = w - 4;
    String displayedTitle;
    if (titleChars.length > maxTitleLen) {
      final cutLen = w - 7;
      if (cutLen > 0) {
        displayedTitle = ' ${titleChars.take(cutLen).toString()}... ';
      } else {
        displayedTitle = '';
      }
    } else {
      displayedTitle = ' $title ';
    }

    if (displayedTitle.isNotEmpty) {
      final dispChars = displayedTitle.characters;
      final titleX = max(1, min(w - 2, ((w - dispChars.length) / 2).floor()));
      windowViewport.writeString(titleX, 0, displayedTitle, titleStyle);
    }
  }

  // Side borders
  for (var y = 1; y < h - 1; y++) {
    windowViewport.writeString(0, y, borderChars[3], borderStyle);
    windowViewport.writeString(w - 1, y, borderChars[5], borderStyle);
  }

  // Bottom border
  final bottomBorder =
      borderChars[6] + borderChars[7] * (w - 2) + borderChars[8];
  windowViewport.writeString(0, h - 1, bottomBorder, borderStyle);

  // Render child content viewport
  final contentArea = Rect(1, 1, w - 2, h - 2);
  final contentViewport = Viewport(windowViewport, contentArea);
  contentViewport.fill(Cell(' ', backgroundStyle));
  child.render(
    contentViewport,
    Rect(0, 0, contentArea.width, contentArea.height),
  );
}