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Keep the last X-axis offset when adding new candles to the beginning of the list #26

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Keep the last X-axis offset when adding new candles to the beginning of the list #26

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10 changes: 10 additions & 0 deletions lib/src/interactive_chart.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -100,6 +100,16 @@ class _InteractiveChartState extends State<InteractiveChart> {
late Offset _initialFocalPoint;
PainterParams? _prevParams; // used in onTapUp event

@override
void didUpdateWidget(covariant InteractiveChart oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.candles.length < widget.candles.length) {
// Change offset to show the latest candle when new data is added
_startOffset =
max(0, widget.candles.length * _candleWidth - _prevChartWidth!);
}
}

@override
Widget build(BuildContext context) {
return LayoutBuilder(
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