paint method

@override void paint(PaintingContext context, Offset offset)

Paints this render object into the given context at offset.

Implementation

@override
void paint(PaintingContext context, Offset offset) {
  _ensureStylesCached();
  final TextStyle bgStyle = _cachedBgStyle!;
  final TextStyle fgBgStyle = _cachedFgBgStyle!;
  final int textW = _textWidth;
  final int x = offset.x;
  final int y = offset.y;
  context.fillBackground(x, y, textW + 4, bgStyle);
  final int cx = context.writeString(x + 1, y, _text, fgBgStyle);
  final String arrow = _isOpen
      ? ' ${BoxDrawingConstants.arrowUp}'
      : ' ${BoxDrawingConstants.arrowDown}';
  context.writeString(cx, y, arrow, fgBgStyle);
}