web/chart: fix sample (#909)

web/charts/lib/legends/legend_custom_symbol.dart

@@ -29,15 +29,16 @@ class IconRenderer extends charts.CustomSymbolRenderer {
   IconRenderer(this.iconData);
 
   @override
-  Widget build(BuildContext context, {Size size, Color color, bool enabled}) {
+  Widget build(BuildContext context,
+      {Size size, Color color, bool enabled = true}) {
     // Lighten the color if the symbol is not enabled
     // Example: If user has tapped on a Series deselecting it.
     if (!enabled) {
       color = color.withOpacity(0.26);
     }
 
-    return new SizedBox.fromSize(
-        size: size, child: new Icon(iconData, color: color, size: 12.0));
+    return SizedBox.fromSize(
+        size: size, child: Icon(iconData, color: color, size: 12.0));
   }
 }
 
@@ -45,10 +46,11 @@ class LegendWithCustomSymbol extends StatelessWidget {
   final List<charts.Series> seriesList;
   final bool animate;
 
-  LegendWithCustomSymbol(this.seriesList, {this.animate});
+  const LegendWithCustomSymbol(this.seriesList, {this.animate, Key key})
+      : super(key: key);
 
   factory LegendWithCustomSymbol.withSampleData() {
-    return new LegendWithCustomSymbol(
+    return LegendWithCustomSymbol(
       _createSampleData(),
       // Disable animations for image tests.
       animate: false,
@@ -60,61 +62,61 @@ class LegendWithCustomSymbol extends StatelessWidget {
   // It is used for creating random series data to demonstrate animation in
   // the example app only.
   factory LegendWithCustomSymbol.withRandomData() {
-    return new LegendWithCustomSymbol(_createRandomData());
+    return LegendWithCustomSymbol(_createRandomData());
   }
 
   /// Create random data.
   static List<charts.Series<OrdinalSales, String>> _createRandomData() {
-    final random = new Random();
+    final random = Random();
 
     final desktopSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final tabletSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final mobileSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     final otherSalesData = [
-      new OrdinalSales('2014', random.nextInt(100)),
-      new OrdinalSales('2015', random.nextInt(100)),
-      new OrdinalSales('2016', random.nextInt(100)),
-      new OrdinalSales('2017', random.nextInt(100)),
+      OrdinalSales('2014', random.nextInt(100)),
+      OrdinalSales('2015', random.nextInt(100)),
+      OrdinalSales('2016', random.nextInt(100)),
+      OrdinalSales('2017', random.nextInt(100)),
     ];
 
     return [
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Desktop',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: desktopSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Tablet',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: tabletSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Mobile',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: mobileSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Other',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
@@ -126,7 +128,7 @@ class LegendWithCustomSymbol extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return new charts.BarChart(
+    return charts.BarChart(
       seriesList,
       animate: animate,
       barGroupingType: charts.BarGroupingType.grouped,
@@ -135,62 +137,62 @@ class LegendWithCustomSymbol extends StatelessWidget {
       //
       // To change the symbol used in the legend, set the renderer attribute of
       // symbolRendererKey to a SymbolRenderer.
-      behaviors: [new charts.SeriesLegend()],
-      defaultRenderer: new charts.BarRendererConfig(
-          symbolRenderer: new IconRenderer(Icons.cloud)),
+      behaviors: [charts.SeriesLegend()],
+      defaultRenderer:
+          charts.BarRendererConfig(symbolRenderer: IconRenderer(Icons.cloud)),
     );
   }
 
   /// Create series list with multiple series
   static List<charts.Series<OrdinalSales, String>> _createSampleData() {
     final desktopSalesData = [
-      new OrdinalSales('2014', 5),
-      new OrdinalSales('2015', 25),
-      new OrdinalSales('2016', 100),
-      new OrdinalSales('2017', 75),
+      OrdinalSales('2014', 5),
+      OrdinalSales('2015', 25),
+      OrdinalSales('2016', 100),
+      OrdinalSales('2017', 75),
     ];
 
     final tabletSalesData = [
-      new OrdinalSales('2014', 25),
-      new OrdinalSales('2015', 50),
-      new OrdinalSales('2016', 10),
-      new OrdinalSales('2017', 20),
+      OrdinalSales('2014', 25),
+      OrdinalSales('2015', 50),
+      OrdinalSales('2016', 10),
+      OrdinalSales('2017', 20),
     ];
 
     final mobileSalesData = [
-      new OrdinalSales('2014', 10),
-      new OrdinalSales('2015', 15),
-      new OrdinalSales('2016', 50),
-      new OrdinalSales('2017', 45),
+      OrdinalSales('2014', 10),
+      OrdinalSales('2015', 15),
+      OrdinalSales('2016', 50),
+      OrdinalSales('2017', 45),
     ];
 
     final otherSalesData = [
-      new OrdinalSales('2014', 20),
-      new OrdinalSales('2015', 35),
-      new OrdinalSales('2016', 15),
-      new OrdinalSales('2017', 10),
+      OrdinalSales('2014', 20),
+      OrdinalSales('2015', 35),
+      OrdinalSales('2016', 15),
+      OrdinalSales('2017', 10),
     ];
 
     return [
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Desktop',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: desktopSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Tablet',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: tabletSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Mobile',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,
         data: mobileSalesData,
       ),
-      new charts.Series<OrdinalSales, String>(
+      charts.Series<OrdinalSales, String>(
         id: 'Other',
         domainFn: (OrdinalSales sales, _) => sales.year,
         measureFn: (OrdinalSales sales, _) => sales.sales,