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Add parameter for initial value #1

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Add parameter for initial value #1

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50a02fb
Add parameter for initial value
pr4s4di Nov 25, 2023
b47e385
Remove PostFrameCallback when set initial value to weight picker and …
pr4s4di Jan 23, 2024
a33889e
Update set initial index from using division to set selected index di…
pr4s4di Aug 4, 2024
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28 changes: 27 additions & 1 deletion lib/animated_weight_picker.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -417,6 +417,16 @@ class AnimatedWeightPicker extends StatefulWidget {
///
final Function(String newValue)? onChange;

/// Initial value of a weight picker/value picker
/// it's determine the initial position of picker
/// ```dart
///
/// 'Added by @prasetya4di'
/// ```
/// https://www.gurutechnolabs.com/
/// Web & App Development Company
final double? initialValue;

/// ```dart
///
/// 'Developed by GuruTechnolabs'
Expand Down Expand Up @@ -476,6 +486,8 @@ class AnimatedWeightPicker extends StatefulWidget {
this.suffix,
//
this.onChange,
//
this.initialValue,
}) : assert(!(max < min)),
assert(!(min == max)),
assert(!(max < 1)),
Expand All @@ -495,7 +507,9 @@ class AnimatedWeightPicker extends StatefulWidget {
assert(!(minorIntervalTextSize > 20 || minorIntervalTextSize < 1)),
assert(!(subIntervalTextSize > 20 || subIntervalTextSize < 1)),
assert(!(division < 0.1 || division > 1)),
assert(squeeze > 0);
assert(squeeze > 0),
assert(!(initialValue != null &&
(initialValue < min || initialValue > max)));

@override
State<AnimatedWeightPicker> createState() => _AnimatedWeightPickerState();
Expand All @@ -508,6 +522,8 @@ class _AnimatedWeightPickerState extends State<AnimatedWeightPicker> {
final List<WheelModel> _valueList = [];
int _selectedIndex = 0;

late final FixedExtentScrollController _scrollController;

@override
void initState() {
super.initState();
Expand Down Expand Up @@ -545,7 +561,15 @@ class _AnimatedWeightPickerState extends State<AnimatedWeightPicker> {

currentIndex++;
current += interval;

if (widget.initialValue != null &&
current.toPrecision(_valuePrecision) == widget.initialValue) {
_selectedIndex = currentIndex;
}
} while (current.toPrecision(2) <= widget.max);

_scrollController =
FixedExtentScrollController(initialItem: _selectedIndex);
if (!onInit) setState(() {});
}

Expand All @@ -570,6 +594,8 @@ class _AnimatedWeightPickerState extends State<AnimatedWeightPicker> {
child: RotatedBox(
quarterTurns: -45,
child: ListWheelScrollView.useDelegate(
physics: const FixedExtentScrollPhysics(),
controller: _scrollController,
offAxisFraction: 2,
perspective: 0.003,
itemExtent: 30,
Expand Down