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added support for list of values #121

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added support for list of values #121

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55 changes: 54 additions & 1 deletion example/lib/main.dart
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,13 +27,14 @@ class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return DefaultTabController(
length: 2,
length: 3,
child: Scaffold(
appBar: AppBar(
bottom: TabBar(
tabs: [
Tab(text: 'Integer'),
Tab(text: 'Decimal'),
Tab(text: 'List'),
],
),
title: Text('Numberpicker example'),
Expand All @@ -42,6 +43,7 @@ class _MyHomePageState extends State<MyHomePage> {
children: [
_IntegerExample(),
_DecimalExample(),
_ListExample(),
],
),
),
Expand Down Expand Up @@ -161,3 +163,54 @@ class __DecimalExampleState extends State<_DecimalExample> {
);
}
}

class _ListExample extends StatefulWidget {
@override
__ListExampleState createState() => __ListExampleState();
}

class __ListExampleState extends State<_ListExample> {
final List<int> valuesList = [10, 30, 20, 40, 55, 1, 2, 3, 4, 5, 76, 75, 74, 73];
int _currentIndex = 3;

int get _currentIntValue => valuesList[_currentIndex];

@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
SizedBox(height: 16),
Text('List', style: Theme.of(context).textTheme.headline6),
NumberPicker.fromList(
valuesList: valuesList,
value: _currentIndex,
haptics: true,
onChanged: (index) => setState(() {
_currentIndex = index;
}),
),
SizedBox(height: 32),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
IconButton(
icon: Icon(Icons.remove),
onPressed: () => setState(() {
final newIndex = _currentIndex - 1;
_currentIndex = newIndex.clamp(0, valuesList.length - 1);
}),
),
Text('Current int value: $_currentIntValue'),
IconButton(
icon: Icon(Icons.add),
onPressed: () => setState(() {
final newIndex = _currentIndex + 2;
_currentIndex = newIndex.clamp(0, valuesList.length - 1);
}),
),
],
),
],
);
}
}
67 changes: 59 additions & 8 deletions lib/src/numberpicker.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ class NumberPicker extends StatefulWidget {
final int maxValue;

/// Currently selected value
/// Will be the index if a list is being used (isFromList == true)
final int value;

/// Called when selected value changes
Expand Down Expand Up @@ -57,6 +58,13 @@ class NumberPicker extends StatefulWidget {

final bool infiniteLoop;

/// List of values to choose from.
/// Will be empty by default (if isFromList == false)
final List<int> valuesList;

/// Indicates if values are will be selected from valuesList or not.
final bool isFromList;

const NumberPicker({
Key? key,
required this.minValue,
Expand All @@ -77,6 +85,32 @@ class NumberPicker extends StatefulWidget {
this.infiniteLoop = false,
}) : assert(minValue <= value),
assert(value <= maxValue),
this.valuesList = const [],
this.isFromList = false,
super(key: key);

const NumberPicker.fromList({
Key? key,
required this.valuesList,
required this.value,
required this.onChanged,
this.itemCount = 3,
this.itemHeight = 50,
this.itemWidth = 100,
this.axis = Axis.vertical,
this.textStyle,
this.selectedTextStyle,
this.haptics = false,
this.decoration,
this.zeroPad = false,
this.textMapper,
this.infiniteLoop = false,
}) : assert(0 <= value),
assert(value <= valuesList.length - 1),
this.minValue = 0,
this.maxValue = valuesList.length - 1,
this.step = 1,
this.isFromList = true,
super(key: key);

@override
Expand Down Expand Up @@ -107,8 +141,9 @@ class _NumberPickerState extends State<NumberPicker> {
} else {
indexOfMiddleElement = indexOfMiddleElement.clamp(0, itemCount - 1);
}
final intValueInTheMiddle =
_intValueFromIndex(indexOfMiddleElement + additionalItemsOnEachSide);
final intValueInTheMiddle = widget.isFromList
? _correctIndex(indexOfMiddleElement + additionalItemsOnEachSide)
: _intValueFromIndex(indexOfMiddleElement + additionalItemsOnEachSide);

if (widget.value != intValueInTheMiddle) {
widget.onChanged(intValueInTheMiddle);
Expand All @@ -118,7 +153,7 @@ class _NumberPickerState extends State<NumberPicker> {
}
Future.delayed(
Duration(milliseconds: 100),
() => _maybeCenterValue(),
() => _maybeCenterValue(),
);
}

Expand Down Expand Up @@ -199,7 +234,9 @@ class _NumberPickerState extends State<NumberPicker> {
final selectedStyle = widget.selectedTextStyle ??
themeData.textTheme.headline5?.copyWith(color: themeData.accentColor);

final value = _intValueFromIndex(index % itemCount);
final value = widget.isFromList
? _correctIndex(index % itemCount)
: _intValueFromIndex(index % itemCount);
final isExtra = !widget.infiniteLoop &&
(index < additionalItemsOnEachSide ||
index >= listItemsCount - additionalItemsOnEachSide);
Expand All @@ -208,9 +245,9 @@ class _NumberPickerState extends State<NumberPicker> {
final child = isExtra
? SizedBox.shrink()
: Text(
_getDisplayedValue(value),
style: itemStyle,
);
_getDisplayedValue(value),
style: itemStyle,
);

return Container(
width: widget.itemWidth,
Expand All @@ -221,6 +258,10 @@ class _NumberPickerState extends State<NumberPicker> {
}

String _getDisplayedValue(int value) {
if (widget.isFromList) {
value = _intValueFromList(value);
}

final text = widget.zeroPad
? value.toString().padLeft(widget.maxValue.toString().length, '0')
: value.toString();
Expand All @@ -231,9 +272,19 @@ class _NumberPickerState extends State<NumberPicker> {
}
}

int _intValueFromIndex(int index) {
int _correctIndex(int index) {
index -= additionalItemsOnEachSide;
index %= itemCount;
return index;
}

int _intValueFromList(int index) {
index = _correctIndex(index);
return widget.valuesList[index];
}

int _intValueFromIndex(int index) {
index = _correctIndex(index);
return widget.minValue + index * widget.step;
}

Expand Down