fl_charts Barchart title issues. switch case - flutter

Question

I don´t know why this switch it's not working, its a copy of the code example in fl_charts doc. But appears in the default case in all the bars.The only differnce is the way to ad the barchardata. I use two List directly, but the chart work well, the problem is the titles.
My chart widget.
EDIT
I know where is the problem, but I don´t know the solution.
The problem is in BarChartGroupData( x: barChartX.length . barChartX.length is an int (10) in this case, and i need to reference to the index of the list (0-9). Doesn't exist any property like indexOf() with the possibility to give me the int of each iteration of the List.generate previous in the widget?
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: BarChart(
BarChartData(
barTouchData: BarTouchData(
touchTooltipData: BarTouchTooltipData(),
),
alignment: BarChartAlignment.center,
barGroups: List.generate(
barChartX.length,
(i) => BarChartGroupData(
x: barChartX.length,
barRods: [
BarChartRodData(
toY: relBarChart[i] * 10,
color: Color.fromARGB(198, 74, 78, 74),
width: 10.0,
borderRadius: BorderRadius.circular(10),
backDrawRodData: BackgroundBarChartRodData(
show: true,
color: Colors.grey,
),
),
],
),
),
titlesData: FlTitlesData(
bottomTitles: AxisTitles(
sideTitles: SideTitles(
getTitlesWidget: getTitles,
showTitles: true,
reservedSize: 38),
),
),
),
),
),
),
and my title widget
Widget getTitles(double value, TitleMeta meta) {
const style = TextStyle(
color: Colors.red,
fontWeight: FontWeight.bold,
fontSize: 14,
);
Widget text;
switch (value.toInt()) {
case 0:
text = const Text('M', style: style);
break;
case 1:
text = const Text('T', style: style);
break;
case 2:
text = const Text('W', style: style);
break;
case 3:
text = const Text('T', style: style);
break;
case 4:
text = const Text('F', style: style);
break;
case 5:
text = const Text('S', style: style);
break;
case 6:
text = const Text('S', style: style);
break;
case 7:
text = const Text('F', style: style);
break;
case 8:
text = const Text('S', style: style);
break;
case 9:
text = const Text('S', style: style);
break;
default:
text = const Text('default', style: style);
break;
}
return SideTitleWidget(
axisSide: meta.axisSide,
space: 16,
child: text,
);
}

Answer 1

To solve it is very easy I only need to put x: i,
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: BarChart(
BarChartData(
barTouchData: BarTouchData(
touchTooltipData: BarTouchTooltipData(),
),
alignment: BarChartAlignment.center,
barGroups: List.generate(
barChartX.length,
(i) => BarChartGroupData(
x: i,
barRods: [
BarChartRodData(
toY: relBarChart[i] * 10,
color: Color.fromARGB(198, 74, 78, 74),
width: 10.0,
borderRadius: BorderRadius.circular(10),
backDrawRodData: BackgroundBarChartRodData(
show: true,
color: Colors.grey,
),
),
],
),
),
titlesData: FlTitlesData(
bottomTitles: AxisTitles(
sideTitles: SideTitles(
getTitlesWidget: getTitles,
showTitles: true,
reservedSize: 38),
),
),
),
),
),
),