fix BrnProgressChart 设置颜色，背景色，以及动画无效

example/lib/sample/components/charts/progress_chart_entry_page.dart

@@ -25,13 +25,17 @@ class ProgressChartExampleState extends State<ProgressChartExample> {
             height: 44,
           ),
           BrnProgressChart(
-            key: UniqueKey(),
-            width: 200,
+            width: 300,
             height: 20,
             value: count,
+            duration: Duration(milliseconds: 500),
+            colors: [Colors.lightBlueAccent, Colors.blue],
+            backgroundColor: Colors.grey,
+            showAnimation: true,
+            isReverse: true,
             brnProgressIndicatorBuilder: (BuildContext context, double value) {
               return Text(
-                '自定义文本：$value',
+                '自定义：$value',
                 style: TextStyle(color: Colors.white),
               );
             },

lib/src/components/charts/brn_progress_chart/brn_progress_chart.dart

@@ -1,6 +1,7 @@
 
 
 import 'package:bruno/src/components/charts/brn_progress_chart/brn_progress_chart_painter.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 /// 在进度条上展示的 Widget
@@ -36,6 +37,12 @@ class BrnProgressChart extends StatefulWidget {
   /// 是否展示动画，默认 false
   final bool showAnimation;
 
+  /// 动画时长,默认 Duration(milliseconds: 250)
+  final Duration duration;
+
+  /// 进度条是否从上次的值开始
+  final bool isReverse;
+
   const BrnProgressChart(
       {Key? key,
       this.width = 0,
@@ -46,7 +53,9 @@ class BrnProgressChart extends StatefulWidget {
       this.brnProgressIndicatorBuilder,
       this.colors = const [Colors.blueAccent, Colors.blue],
       this.backgroundColor = Colors.lightBlueAccent,
-      this.showAnimation = false})
+      this.showAnimation = false,
+      this.isReverse = false,
+      this.duration = const Duration(milliseconds: 250),})
       : assert(0 <= value && value <= 1, 'value 必须在 0 到 1 之间'),
         super(key: key);
 
@@ -59,59 +68,124 @@ class BrnProgressChart extends StatefulWidget {
 class BrnProgressChartState extends State<BrnProgressChart>
     with SingleTickerProviderStateMixin {
   late Animation<double> _animation;
-  AnimationController? _animationController;
-  double _value = 0;
+  late AnimationController _animationController =
+      AnimationController(vsync: this);
+  double _lastValue = 0;
+
+  bool get _isAnimation => widget.showAnimation;
+
+  void _initAnimation() {
+    final double begin = widget.isReverse ? _lastValue : 0;
+    final double end = widget.value;
+    final Tween<double> tween = Tween<double>(begin: begin, end: end);
+    _animationController.duration =
+        _isAnimation ? widget.duration : Duration.zero;
+    _animation = tween.animate(_animationController);
+    _animationController.reset();
+    _animationController.forward();
+    _lastValue = end;
+  }
 
   @override
   void initState() {
     super.initState();
-    if (widget.showAnimation) {
-      _animationController = AnimationController(
-          vsync: this, duration: Duration(milliseconds: 250));
-      Tween tween = Tween<double>(begin: 0, end: widget.value);
-      _animation = tween.animate(_animationController!) as Animation<double>;
-      _animation.addListener(() {
-        setState(() {
-          _value = _animation.value;
-        });
-      });
-      _animationController!.forward();
-    } else {
-      _value = widget.value;
+    _initAnimation();
+  }
+
+  @override
+  void didUpdateWidget(covariant BrnProgressChart oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.value != widget.value) {
+      if (_animationController.isAnimating == true) {
+        _animationController.stop();
+      }
+      _initAnimation();
     }
   }
 
   @override
   void dispose() {
-    _animationController?.dispose();
+    _animationController.dispose();
     super.dispose();
   }
 
-  Widget _indicatorWidgetBuilder(BuildContext context, double value) {
-    return Text(
-      '$value',
-      style: widget.textStyle,
-    );
-  }
-
   @override
   Widget build(BuildContext context) {
+    final double _value = widget.value;
     return Stack(
       children: <Widget>[
         CustomPaint(
           size: Size(widget.width, widget.height),
-          painter: BrnProgressChartPainter(value: _value),
+          painter: BrnProgressChartPainter(
+            value: _value,
+            animation: _animation,
+            backgroundColor: widget.backgroundColor,
+            colors: widget.colors,
+          ),
         ),
         Container(
           width: widget.width,
           height: widget.height,
           padding: EdgeInsets.only(left: widget.indicatorLeftPadding),
           alignment: Alignment.centerLeft,
-          child: null != widget.brnProgressIndicatorBuilder
-              ? widget.brnProgressIndicatorBuilder!(context, _value)
-              : _indicatorWidgetBuilder(context, _value),
+          child: IndicatorWidgetBuilder(
+            notifier: _animation,
+            value: _value,
+            textStyle: widget.textStyle,
+            brnProgressIndicatorBuilder: widget.brnProgressIndicatorBuilder,
+          ),
         )
       ],
     );
   }
 }
+
+class IndicatorWidgetBuilder extends StatefulWidget {
+  const IndicatorWidgetBuilder({
+    Key? key,
+    required this.value,
+    required this.textStyle,
+    this.notifier,
+    this.brnProgressIndicatorBuilder,
+  }) : super(key: key);
+
+  final ValueListenable<double>? notifier;
+  final double value;
+  final TextStyle textStyle;
+  final BrnProgressIndicatorBuilder? brnProgressIndicatorBuilder;
+
+  @override
+  State<IndicatorWidgetBuilder> createState() => _IndicatorWidgetBuilderState();
+}
+
+class _IndicatorWidgetBuilderState extends State<IndicatorWidgetBuilder> {
+  late double _value;
+
+  void _changeListener() {
+    final double value = widget.notifier?.value ?? widget.value;
+    setState(() {
+      _value = value;
+    });
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _value = widget.value;
+    widget.notifier?.addListener(_changeListener);
+  }
+
+  @override
+  void dispose() {
+    widget.notifier?.removeListener(_changeListener);
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final BrnProgressIndicatorBuilder? builder =
+        widget.brnProgressIndicatorBuilder;
+    return builder?.call(context, _value) ??
+        Text('文本：$_value', style: widget.textStyle);
+  }
+}

lib/src/components/charts/brn_progress_chart/brn_progress_chart_painter.dart

@@ -6,6 +6,9 @@ class BrnProgressChartPainter extends CustomPainter {
   /// 进度值
   final double value;
 
+  /// 动画
+  final Animation<double>? animation;
+
   /// 背景色
   final Color backgroundColor;
 
@@ -20,13 +23,18 @@ class BrnProgressChartPainter extends CustomPainter {
 
   BrnProgressChartPainter(
       {this.value = 0.2,
+      this.animation,
       this.colors = const [Color(0xFF1545FD), Color(0xFF0984F9)],
       this.backgroundColor = const Color(0x7A90C9FF),
       this.radius = 4,
-      this.alwaysShowRadius = true});
+      this.alwaysShowRadius = true})
+      : super(repaint: animation){
+    assert(colors.isNotEmpty, 'colors must not be empty');
+  }
 
   @override
   void paint(Canvas canvas, Size size) {
+    final double value = animation?.value ?? this.value;
     Paint backgroundPaint = Paint()
       ..color = this.backgroundColor
       ..style = PaintingStyle.fill;
@@ -48,22 +56,24 @@ class BrnProgressChartPainter extends CustomPainter {
             1 == value && false == this.alwaysShowRadius ? 0 : this.radius),
         topRight: Radius.circular(
             1 == value && false == this.alwaysShowRadius ? 0 : this.radius));
-
-    Shader progressBarShader = LinearGradient(
-            begin: Alignment.centerLeft,
-            end: Alignment.centerRight,
-            tileMode: TileMode.clamp,
-            colors: (this.colors.length > 1)
-                ? this.colors
-                : [this.colors[0], this.colors[0]])
-        .createShader(progressBarRect);
-    Paint progressBarPaint = Paint()..shader = progressBarShader;
+    final bool isNotSingleColor = colors.length > 1;
+    Paint progressBarPaint = Paint();
+    if (isNotSingleColor) {
+      progressBarPaint.shader = LinearGradient(
+              begin: Alignment.centerLeft,
+              end: Alignment.centerRight,
+              tileMode: TileMode.clamp,
+              colors: colors)
+          .createShader(progressBarRect);
+    } else {
+      progressBarPaint.color = colors[0];
+    }
 
     canvas.drawRRect(progressBarRRect, progressBarPaint);
   }
 
   @override
   bool shouldRepaint(BrnProgressChartPainter oldDelegate) {
-    return this.value != oldDelegate.value;
+    return false;
   }
 }