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added support for decimal steps #120

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added support for decimal steps #120

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21 changes: 15 additions & 6 deletions lib/src/decimal_numberpicker.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -26,17 +26,23 @@ class DecimalNumberPicker extends StatelessWidget {
/// Decoration to apply to central box where the selected decimal value is placed
final Decoration? decimalDecoration;

/// Inidcates how many decimal places to show
/// Indicates how many decimal places to show
/// e.g. 0=>[1,2,3...], 1=>[1.0, 1.1, 1.2...] 2=>[1.00, 1.01, 1.02...]
final int decimalPlaces;

/// Indicates Decimal's total step count - defaults to 10
/// e.g. if decimalStepCount = 4 and decimalPlaces = 2
/// => decimal choices would be 0.00, 0.25, 0.50, 0,75
final int decimalStepCount;

const DecimalNumberPicker({
Key? key,
required this.minValue,
required this.maxValue,
required this.value,
required this.onChanged,
this.itemCount = 3,
this.decimalStepCount = 10,
this.itemHeight = 50,
this.itemWidth = 100,
this.axis = Axis.vertical,
Expand All @@ -51,16 +57,18 @@ class DecimalNumberPicker extends StatelessWidget {
this.decimalDecoration,
}) : assert(minValue <= value),
assert(value <= maxValue),
assert(decimalStepCount > 0),
super(key: key);

@override
Widget build(BuildContext context) {
final isMax = value.floor() == maxValue;
final decimalValue = isMax
? 0
: ((value - value.floorToDouble()) * math.pow(10, decimalPlaces))
.round();
final doubleMaxValue = isMax ? 0 : math.pow(10, decimalPlaces).toInt() - 1;
final tenPow = math.pow(10, decimalPlaces);
final decimalValue =
isMax ? 0 : ((value - value.floorToDouble()) * tenPow).round();
final doubleMaxValue = isMax ? 0 : tenPow.toInt() - 1;
final decimalStep =
(tenPow > decimalStepCount) ? tenPow ~/ decimalStepCount : 1;
return Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expand All @@ -85,6 +93,7 @@ class DecimalNumberPicker extends StatelessWidget {
value: decimalValue,
onChanged: _onDoubleChanged,
itemCount: itemCount,
step: decimalStep,
itemHeight: itemHeight,
itemWidth: itemWidth,
textStyle: textStyle,
Expand Down