From 94df789f8cfb2e4b73595cd2e9d065a1127ae781 Mon Sep 17 00:00:00 2001
From: Magomed Dadagov <grozniy.info@gmail.com>
Date: Thu, 13 Jun 2024 00:12:40 +0300
Subject: [PATCH] Keep the last X-axis offset when adding new candles to the
 beginning of the list

---
 lib/src/interactive_chart.dart | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/src/interactive_chart.dart b/lib/src/interactive_chart.dart
index e48c70b..e048aca 100644
--- a/lib/src/interactive_chart.dart
+++ b/lib/src/interactive_chart.dart
@@ -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(