Pay attention!

If you need a regular (not rotated) text at the corner of widgets please consider to use Stack with Containers and Text widgets.
This package was developed to provide auto rotation of TextSpans.

Example

Take a look at the provided example application for how to use the CornerDecoration.

How to use

screenshot1678647469887

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Color(0xffffd700),
    badgeSize: Size(16, 16),
  ),
),

screenshot1678647470825

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.red,
    spanBaselineShift: 4,
    badgeSize: Size(64, 64),
    badgeCornerRadius: Radius.circular(8),
    badgePosition: BadgePosition.topStart,
    textSpan: TextSpan(
      text: 'OMG',
      style: TextStyle(
        color: Colors.white,
        fontSize: 12,
        letterSpacing: 1,
        fontWeight: FontWeight.bold,
        shadows: [
          BoxShadow(color: Colors.yellowAccent, blurRadius: 8),
        ],
      ),
    ),
  ),
),

screenshot1678647471437

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.blue,
    badgeSize: Size(64, 64),
    textSpan: TextSpan(
      text: 'Multiline\nbadge',
      style: TextStyle(fontSize: 10),
    ),
  ),
),

screenshot1678647472293

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.black87,
    badgeSize: Size(64, 64),
    spanBaselineShift: 2,
    textSpan: TextSpan(
      children: [
        TextSpan(
          text: 'LOREM\n',
          style: TextStyle(
            fontSize: 10,
            fontWeight: FontWeight.bold,
            color: Colors.redAccent,
          ),
        ),
        TextSpan(
          text: 'IPSUM',
          style: TextStyle(
            fontSize: 7,
            fontStyle: FontStyle.italic,
            letterSpacing: 5,
            color: Colors.yellow,
          ),
        ),
      ],
    ),
  ),
),

screenshot1678647473029

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.brown,
    badgeSize: Size(112, 56),
    textSpan: TextSpan(
      text: 'WEIRD BADGE',
      style: TextStyle(fontSize: 10),
    ),
  ),
),

screenshot1678647473739

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.blueGrey,
    badgeSize: Size(64, 64),
    textSpan: TextSpan(
      text: 'WOW',
      style: TextStyle(fontSize: 10),
    ),
    spanHorizontalOffset: -12,
  ),
),

screenshot1678647478380

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.green,
    badgeSize: Size(64, 64),
    textSpan: TextSpan(
      text: 'SHIFT 1',
      style: TextStyle(fontSize: 10, backgroundColor: Colors.black),
    ),
  ),
),

screenshot1678647479092

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.green,
    badgeSize: Size(64, 64),
    spanBaselineShift: 3,
    textSpan: TextSpan(
      text: 'SHIFT 4',
      style: TextStyle(fontSize: 10, backgroundColor: Colors.black),
    ),
  ),
),

screenshot1678647479917

Container(
  foregroundDecoration: RotatedCornerDecoration.withGradient(
    gradient: LinearGradient(
      begin: Alignment.topRight,
      end: Alignment.bottomLeft,
      colors: [Colors.blue, Colors.lightGreenAccent],
    ),
    badgeSize: Size(64, 64),
  ),
  decoration: RotatedCornerDecoration.withGradient(
    badgePosition: BadgePosition.topStart,
    gradient: LinearGradient(
      begin: Alignment.topLeft,
      end: Alignment.topRight,
      stops: [0, 0.5, 1],
      colors: [
        Colors.purpleAccent,
        Colors.amber,
        Colors.blue,
      ],
    ),
    badgeSize: Size(64, 64),
  ),
),

screenshot1678647480605

Container(
  foregroundDecoration: RotatedCornerDecoration.withGradient(
    gradient: RadialGradient(
      center: Alignment.topRight,
      radius: 1.5,
      stops: const [0, 0.25, 0.5],
      colors: [
        Colors.redAccent,
        Colors.redAccent.withOpacity(0.5),
        Colors.redAccent.withOpacity(0),
      ],
    ),
    badgeSize: const Size(64, 64),
  ),
  decoration: RotatedCornerDecoration.withGradient(
    badgePosition: BadgePosition.topStart,
    gradient: SweepGradient(
      center: const FractionalOffset(0.27, -0.65),
      colors: List.generate(360, _generator),
    ),
    badgeSize: const Size(64, 64),
  ),
),

screenshot1678647483564

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.lightBlue,
    badgeSize: Size(64, 64),
    badgeShadow: BadgeShadow(color: Colors.black, elevation: 4),
  ),
),

screenshot1678647484300

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.indigo,
    badgeSize: Size(64, 64),
    badgePosition: BadgePosition.bottomStart,
    textDirection: TextDirection.ltr,
  ),
),

screenshot1678647485147

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.indigo,
    badgeSize: Size(64, 64),
    badgePosition: BadgePosition.bottomStart,
    textDirection: TextDirection.rtl,
  ),
),

EXPERIMENTAL FEATURE!

use isEmoji: true to disable span rotating
you can shift span position with spanHorizontalOffset and TextStyle.height parameters screenshot1678649657350

Container(
  foregroundDecoration: RotatedCornerDecoration.withColor(
    color: Colors.purple,
    badgeSize: Size(64, 64),
    isEmoji: true,
    textSpan: TextSpan(
      text: '🤮',
      style: TextStyle(fontSize: 20, height: 1.7),
    ),
  ),
),

Libraries

rotated_corner_decoration