My-code-snippets/max_range_slider at master · sabreys/My-code-snippets · GitHub

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 SfRangeSlider(
          min: 18,
          max: 40,
          values: _values,
          enableTooltip: true,
          stepSize: 1,
          enableIntervalSelection: true,
          interval: 5,
          showTicks: true,
          showLabels: true,
          minorTicksPerInterval: 1,
          onChanged: (SfRangeValues values) {
            SfRangeValues val;

            setState(() {
              if (_values.start == values.start) {
                if (values.end - values.start > 5) {
                  val = SfRangeValues(values.end - 5, values.end);
                  _values = val;
                } else {
                  _values = values;
                }
              } else {
                if (values.end - values.start > 5) {
                  val = SfRangeValues(values.start, values.start + 5);
                  _values = val;
                } else {
                  _values = values;
                }
              }
            });
          },
        );