How to Decorate Text Stroke In Flutter?

4 min read
How to Decorate Text Stroke In Flutter
How to Decorate Text Stroke In Flutter

Text Widget allows you to display text in your flutter application. So in today’s article, We will go through how to Decorate Text Stroke In Flutter.

How to Decorate Text Stroke In Flutter??

Stroke has been possible without workarounds since the addition of foreground paints in TextStyle. An explicit example of stroke underfill bordered text has been added in the TextStyle documentation Here.

Code Snippet will look like the below:

Stack(
  children: <Widget>[
    // Stroked text as border.
    Text(
      'Greetings, planet!',
      style: TextStyle(
        fontSize: 40,
        foreground: Paint()
          ..style = PaintingStyle.stroke
          ..strokeWidth = 6
          ..color = Colors.blue[700],
      ),
    ),
    // Solid text as fill.
    Text(
      'Greetings, planet!',
      style: TextStyle(
        fontSize: 40,
        color: Colors.grey[300],
      ),
    ),
  ],
)

The above code will give us output like the below:

decorate text stroke
decorate text stroke

You can also apply 4 shadows in the TextStyle like the below:

Text("Border test",
    style: TextStyle(
      inherit: true,
      fontSize: 48.0,
      color: Colors.pink,
      shadows: [
        Shadow( // bottomLeft
          offset: Offset(-1.5, -1.5),
          color: Colors.white
        ),
        Shadow( // bottomRight
          offset: Offset(1.5, -1.5),
          color: Colors.white
        ),
        Shadow( // topRight
          offset: Offset(1.5, 1.5),
          color: Colors.white
        ),
        Shadow( // topLeft
          offset: Offset(-1.5, 1.5),
          color: Colors.white
        ),
      ]
    ),
);

You can also use the technique that mixes Two Text Widgets and TextStype.foreground property with Custom Paint():

class StrokeText extends StatelessWidget {
  final String text;
  final double fontSize;
  final FontWeight fontWeight;
  final Color color;
  final Color strokeColor;
  final double strokeWidth;

  const StrokeText(
    this.text, {
    Key key,
    this.fontSize,
    this.fontWeight,
    this.color,
    this.strokeColor,
    this.strokeWidth,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        Text(
          text,
          style: TextStyle(
            fontSize: fontSize,
            fontWeight: fontWeight,
            foreground: Paint()..color = color,
          ),
        ),
        Text(
          text,
          style: TextStyle(
            fontSize: fontSize,
            fontWeight: fontWeight,
            foreground: Paint()
              ..strokeWidth = strokeWidth
              ..color = strokeColor
              ..style = PaintingStyle.stroke,
          ),
        ),
      ],
    );
  }
}

If you prefer the shadows method, you can configure the stroke width using this right below:

/// Outlines a text using shadows.
static List<Shadow> outlinedText({double strokeWidth = 2, Color strokeColor = Colors.black, int precision = 5}) {
  Set<Shadow> result = HashSet();
  for (int x = 1; x < strokeWidth + precision; x++) {
    for(int y = 1; y < strokeWidth + precision; y++) {
      double offsetX = x.toDouble();
      double offsetY = y.toDouble();
      result.add(Shadow(offset: Offset(-strokeWidth / offsetX, -strokeWidth / offsetY), color: strokeColor));
      result.add(Shadow(offset: Offset(-strokeWidth / offsetX, strokeWidth / offsetY), color: strokeColor));
      result.add(Shadow(offset: Offset(strokeWidth / offsetX, -strokeWidth / offsetY), color: strokeColor));
      result.add(Shadow(offset: Offset(strokeWidth / offsetX, strokeWidth / offsetY), color: strokeColor));
    }
  }
  return result.toList();
}

Use it as this snippet shown below:

Text(
  'My text',
  style: TextStyle(shadows: outlinedText(strokeColor: Colors.blue)),
)

Conclusion:

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So in this article, we have been through How to Decorate Text Stroke In Flutter.

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