// Author: fengshengxiong
// Date: 2024/6/2
// Description: 自定义RoundedRectSliderTrackShape

import 'package:flutter/material.dart';

class RoundRectSliderTrackShape extends SliderTrackShape {
  final double trackHeight;
  final double trackRadius;

  const RoundRectSliderTrackShape({
    this.trackHeight = 4.0,
    this.trackRadius = 8.0,
  });

  @override
  void paint(PaintingContext context, Offset offset,
      {required RenderBox parentBox,
      required SliderThemeData sliderTheme,
      required Animation<double> enableAnimation,
      required Offset thumbCenter,
      Offset? secondaryOffset,
      bool isEnabled = false,
      bool isDiscrete = false,
      required TextDirection textDirection}) {
    if (sliderTheme.trackHeight == 0) return;

    final Rect trackRect = getPreferredRect(
      parentBox: parentBox,
      offset: offset,
      sliderTheme: sliderTheme,
      isEnabled: isEnabled,
      isDiscrete: isDiscrete,
    );

    final Paint leftTrackPaint = Paint()
      ..color = sliderTheme.activeTrackColor!
      ..style = PaintingStyle.fill;

    final Paint rightTrackPaint = Paint()
      ..color = sliderTheme.inactiveTrackColor!
      ..style = PaintingStyle.fill;

    final RRect leftTrackSegment = RRect.fromLTRBR(
      trackRect.left,
      trackRect.top,
      thumbCenter.dx,
      trackRect.bottom,
      Radius.circular(trackRadius),
    );

    final RRect rightTrackSegment = RRect.fromLTRBR(
      thumbCenter.dx,
      trackRect.top,
      trackRect.right,
      trackRect.bottom,
      Radius.circular(trackRadius),
    );

    context.canvas.drawRRect(leftTrackSegment, leftTrackPaint);
    context.canvas.drawRRect(rightTrackSegment, rightTrackPaint);
  }

  @override
  Rect getPreferredRect({
    required RenderBox parentBox,
    Offset offset = Offset.zero,
    required SliderThemeData sliderTheme,
    bool isEnabled = false,
    bool isDiscrete = false,
  }) {
    final double trackHeight = this.trackHeight;
    final double trackLeft = offset.dx;
    final double trackTop =
        offset.dy + (parentBox.size.height - trackHeight) / 2;
    final double trackWidth = parentBox.size.width;
    return Rect.fromLTWH(trackLeft, trackTop, trackWidth, trackHeight);
  }
}