Remove CustomPainter and use RenderObjects for our drawing engine in …

…line_chart.

Also removed touch_input, we will use Flutter's PointerEvent.

example/lib/line_chart/samples/line_chart_sample3.dart

@@ -1,5 +1,6 @@
 import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/gestures.dart';
 
 class LineChartSample3 extends StatefulWidget {
   final weekDays = ['Sat', 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri'];
@@ -97,8 +98,8 @@ class _LineChartSample3State extends State<LineChartSample3> {
                       }),
                   touchCallback: (LineTouchResponse lineTouch) {
                     if (lineTouch.lineBarSpots.length == 1 &&
-                        lineTouch.touchInput is! FlLongPressEnd &&
-                        lineTouch.touchInput is! FlPanEnd) {
+                        lineTouch.touchInput is! PointerExitEvent &&
+                        lineTouch.touchInput is! PointerUpEvent) {
                       final value = lineTouch.lineBarSpots[0].x;
 
                       if (value == 0 || value == 6) {

lib/fl_chart.dart

@@ -4,7 +4,6 @@ export 'src/chart/bar_chart/bar_chart.dart';
 export 'src/chart/bar_chart/bar_chart_data.dart';
 export 'src/chart/base/axis_chart/axis_chart_data.dart';
 export 'src/chart/base/base_chart/base_chart_data.dart';
-export 'src/chart/base/base_chart/touch_input.dart';
 export 'src/chart/line_chart/line_chart.dart';
 export 'src/chart/line_chart/line_chart_data.dart';
 export 'src/chart/pie_chart/pie_chart.dart';

lib/src/chart/base/base_chart/base_chart_data.dart

@@ -3,7 +3,6 @@ import 'package:fl_chart/src/utils/utils.dart';
 import 'package:flutter/material.dart';
 
 import 'base_chart_painter.dart';
-import 'touch_input.dart';
 
 /// This class holds all data needed for [BaseChartPainter].
 ///
@@ -150,9 +149,9 @@ TextStyle defaultGetTitleTextStyle(double value) {
 ///
 /// Specific touch details should be hold on the concrete child classes.
 class BaseTouchResponse with EquatableMixin {
-  final FlTouchInput touchInput;
+  final PointerEvent touchInput;
 
-  BaseTouchResponse(FlTouchInput touchInput) : touchInput = touchInput;
+  BaseTouchResponse(PointerEvent touchInput) : touchInput = touchInput;
 
   /// Used for equality check, see [EquatableMixin].
   @override

lib/src/chart/base/base_chart/base_chart_painter.dart

@@ -2,12 +2,12 @@ import 'package:fl_chart/src/utils/canvas_wrapper.dart';
 import 'package:flutter/material.dart';
 import 'package:fl_chart/src/extensions/paint_extension.dart';
 import 'base_chart_data.dart';
-import 'touch_input.dart';
+import 'chart_painter.dart';
 
 /// Base class of our painters.
 ///
 /// It is responsible to do basic jobs, like drawing borders of charts.
-abstract class BaseChartPainter<D extends BaseChartData> extends CustomPainter {
+abstract class BaseChartPainter<D extends BaseChartData> extends ChartPainter {
   final D data;
   final D targetData;
   late Paint _borderPaint;
@@ -106,11 +106,3 @@ abstract class BaseChartPainter<D extends BaseChartData> extends CustomPainter {
   /// and the height space we can use to draw chart is[getChartUsableDrawSize.height]
   double getTopOffsetDrawSize() => 0;
 }
-
-mixin TouchHandler<T extends BaseTouchResponse> {
-  T handleTouch(
-    FlTouchInput touchInput,
-    Size size,
-  ) =>
-      throw UnsupportedError('not implemented');
-}

lib/src/chart/base/base_chart/chart_painter.dart

@@ -0,0 +1,8 @@
+import 'dart:ui';
+
+/// Abstract class for our painters
+///
+/// This class contains [paint] method, that takes a [canvas], and [size] for drawing the content.
+abstract class ChartPainter {
+  void paint(Canvas canvas, Size size);
+}