paint method

@override void paint(PaintingContext context, Offset center, { required RenderBox parentBox, required SliderThemeData sliderTheme, required Animation<double> enableAnimation, required TextDirection textDirection, required Offset thumbCenter, required bool isEnabled, })

Paint method

Implementation

@override
void paint(
  PaintingContext context,
  Offset center, {
  required RenderBox parentBox,
  required SliderThemeData sliderTheme,
  required Animation<double> enableAnimation,
  required TextDirection textDirection,
  required Offset thumbCenter,
  required bool isEnabled,
}) {
  Color? begin;
  Color? end;
  switch (textDirection) {
    case TextDirection.ltr:
      final bool isTickMarkRightOfThumb = center.dx > thumbCenter.dx;
      begin = isTickMarkRightOfThumb
          ? sliderTheme.disabledInactiveTickMarkColor
          : sliderTheme.disabledActiveTickMarkColor;
      end = isTickMarkRightOfThumb ? sliderTheme.inactiveTickMarkColor : sliderTheme.activeTickMarkColor;

      break;
    case TextDirection.rtl:
      final bool isTickMarkLeftOfThumb = center.dx < thumbCenter.dx;
      begin =
          isTickMarkLeftOfThumb ? sliderTheme.disabledInactiveTickMarkColor : sliderTheme.disabledActiveTickMarkColor;
      end = isTickMarkLeftOfThumb ? sliderTheme.inactiveTickMarkColor : sliderTheme.activeTickMarkColor;
      break;
  }

  /// Array to store index
  if (canvasXIndex.length != inputValues!.length) {
    canvasXIndex.add(center.dx);
  }

  /// Tick mark paint
  final Paint tickMarkPaint = Paint()..color = ColorTween(begin: begin, end: end).evaluate(enableAnimation)!;

  /// Marker paint
  final Paint markerPaint = Paint()
    ..strokeWidth = 1
    ..strokeCap = StrokeCap.round
    ..color = ColorTween(begin: begin, end: end).evaluate(enableAnimation)!;

  if (tickMarkRadius! > 0) {
    context.canvas.drawCircle(Offset(center.dx, center.dy), tickMarkRadius!, tickMarkPaint);

    int index = 0;
    for (var element in canvasXIndex) {
      if (element == center.dx) {
        break;
      }
      index++;
    }

    context.canvas.drawLine(
        Offset(center.dx, center.dy),
        Offset(center.dx, labelDirection == NumericLabelDirection.below ? (center.dy + 15) : (center.dy - 15)),
        markerPaint);

    TextSpan span = TextSpan(style: numericLabelTextStyle, text: currencyPrefix! + inputValues![index].toString());

    TextPainter tp = TextPainter(text: span, textAlign: TextAlign.left, textDirection: TextDirection.ltr);

    tp.layout();
    tp.paint(
        context.canvas,
        Offset(labelDirection == NumericLabelDirection.below ? (center.dx - 12) : (center.dx - 10),
            labelDirection == NumericLabelDirection.below ? (center.dy + 20) : (center.dy - 35)));
  }
}