feat: add buildSemantics to base classes and vertical barrier painter

example/lib/main.dart

@@ -10,6 +10,7 @@ import 'package:example/settings_page.dart';
 import 'package:example/utils/endpoints_helper.dart';
 import 'package:example/widgets/connection_status_label.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/semantics.dart';
 import 'package:flutter_deriv_api/api/exceptions/exceptions.dart';
 import 'package:flutter_deriv_api/api/manually/ohlc_response_result.dart';
 import 'package:flutter_deriv_api/api/manually/tick.dart' as tick_api;
@@ -38,6 +39,8 @@ class MyHttpOverrides extends HttpOverrides {
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
+  SemanticsBinding.instance.ensureSemantics();
+
   HttpOverrides.global = MyHttpOverrides();
   runApp(const MyApp());
 }

lib/src/deriv_chart/chart/custom_painters/chart_painter.dart

@@ -59,4 +59,11 @@ class ChartPainter extends CustomPainter {
 
   @override
   bool shouldRebuildSemantics(ChartPainter oldDelegate) => false;
+
+  @override
+  SemanticsBuilderCallback get semanticsBuilder {
+    return (Size size) {
+      return chartData.buildSemantics(size, epochToCanvasX, quoteToCanvasY);
+    };
+  }
 }

lib/src/deriv_chart/chart/data_visualization/annotations/barriers/accumulators_barriers/accumulators_closed_indicator_painter.dart

@@ -200,4 +200,12 @@ class AccumulatorsClosedIndicatorPainter
     // Draw exit tick position.
     paintDotWithGlow(canvas, exitTickPosition, color: color);
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics(
+      {required Size size,
+      required EpochToX epochToX,
+      required QuoteToY quoteToY}) {
+    return <CustomPainterSemantics>[];
+  }
 }

lib/src/deriv_chart/chart/data_visualization/annotations/barriers/accumulators_barriers/accumulators_entry_spot_barrier_painter.dart

@@ -106,4 +106,12 @@ class AccumulatorsEntrySpotBarrierPainter<
       1,
     );
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics(
+      {required ui.Size size,
+      required EpochToX epochToX,
+      required QuoteToY quoteToY}) {
+    return <CustomPainterSemantics>[];
+  }
 }

lib/src/deriv_chart/chart/data_visualization/annotations/barriers/accumulators_barriers/accumulators_indicator_painter.dart

@@ -521,4 +521,12 @@ class AccumulatorIndicatorPainter extends SeriesPainter<AccumulatorIndicator> {
           Offset(mainLineStartX, y), Offset(mainLineEndX, y), _paint);
     }
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics(
+      {required ui.Size size,
+      required EpochToX epochToX,
+      required QuoteToY quoteToY}) {
+    return <CustomPainterSemantics>[];
+  }
 }

lib/src/deriv_chart/chart/data_visualization/annotations/barriers/accumulators_barriers/accumulators_recently_closed_indicator_painter.dart

@@ -248,4 +248,12 @@ class AccumulatorsRecentlyClosedIndicatorPainter
       );
     }
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics(
+      {required Size size,
+      required EpochToX epochToX,
+      required QuoteToY quoteToY}) {
+    return <CustomPainterSemantics>[];
+  }
 }

lib/src/deriv_chart/chart/data_visualization/annotations/barriers/entry_tick_annotation.dart

@@ -8,6 +8,7 @@ import 'package:deriv_chart/src/deriv_chart/chart/data_visualization/models/barr
 import 'package:deriv_chart/src/deriv_chart/chart/helpers/paint_functions/paint_entry_exit_marker.dart';
 import 'package:deriv_chart/src/models/tick.dart';
 import 'package:deriv_chart/src/theme/painting_styles/entry_exit_marker_style.dart';
+import 'package:flutter/rendering.dart';
 
 import '../chart_annotation.dart';
 
@@ -57,4 +58,12 @@ class _EntryTickAnnotationPainter extends SeriesPainter<EntryTickAnnotation> {
     );
     paintEntryExitMarker(canvas, center, series.style as EntryExitMarkerStyle);
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics(
+      {required Size size,
+      required EpochToX epochToX,
+      required QuoteToY quoteToY}) {
+    return <CustomPainterSemantics>[];
+  }
 }

lib/src/deriv_chart/chart/data_visualization/annotations/barriers/horizontal_barrier/horizontal_barrier_painter.dart

@@ -331,6 +331,15 @@ class HorizontalBarrierPainter<T extends HorizontalBarrier>
           ),
           arrowPaint..color = _paint.color.withOpacity(0.32));
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics({
+    required Size size,
+    required EpochToX epochToX,
+    required QuoteToY quoteToY,
+  }) {
+    return <CustomPainterSemantics>[];
+  }
 }
 
 /// The painter for the [IconTickIndicator] which paints the icon on the
@@ -392,4 +401,13 @@ class IconBarrierPainter extends HorizontalBarrierPainter<IconTickIndicator> {
         _barrierPosition! - Offset(innerIconSize / 2, innerIconSize / 2),
       );
   }
+
+  @override
+  List<CustomPainterSemantics> buildSemantics({
+    required Size size,
+    required EpochToX epochToX,
+    required QuoteToY quoteToY,
+  }) {
+    return <CustomPainterSemantics>[];
+  }
 }