Use hashValues instead of hard-coded hashCode getters

examples/stocks/lib/stock_row.dart

@@ -21,7 +21,7 @@ class StockRowPartKey extends Key {
         && stock == typedOther.stock
         && part == typedOther.part;
   }
-  int get hashCode => 37 * (37 * (37 * (373) + identityHashCode(keySalt)) + identityHashCode(stock)) + identityHashCode(part);
+  int get hashCode => hashValues(keySalt, stock, part);
   String toString() => '[$runtimeType ${keySalt.toString().split(".")[1]}:${stock.symbol}:${part.toString().split(".")[1]}]';
 }
 

packages/flutter/lib/src/material/theme_data.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui' show Color;
+import 'dart:ui' show Color, hashValues;
 
 import 'colors.dart';
 import 'icon_theme_data.dart';
@@ -153,19 +153,19 @@ class ThemeData {
            (otherData.accentColorBrightness == accentColorBrightness);
   }
   int get hashCode {
-    int value = 373;
-    value = 37 * value + brightness.hashCode;
-    value = 37 * value + primarySwatch.hashCode;
-    value = 37 * value + canvasColor.hashCode;
-    value = 37 * value + cardColor.hashCode;
-    value = 37 * value + dividerColor.hashCode;
-    value = 37 * value + hintColor.hashCode;
-    value = 37 * value + highlightColor.hashCode;
-    value = 37 * value + hintOpacity.hashCode;
-    value = 37 * value + text.hashCode;
-    value = 37 * value + primaryColorBrightness.hashCode;
-    value = 37 * value + accentColorBrightness.hashCode;
-    return value;
+    return hashValues(
+      brightness,
+      primarySwatch,
+      canvasColor,
+      cardColor,
+      dividerColor,
+      hintColor,
+      highlightColor,
+      hintOpacity,
+      text,
+      primaryColorBrightness,
+      accentColorBrightness
+    );
   }
 
   String toString() => '$primaryColor $brightness etc...';

packages/flutter/lib/src/material/time_picker.dart

@@ -84,12 +84,7 @@ class TimeOfDay {
         && typedOther.minute == minute;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + hour.hashCode;
-    value = 37 * value + minute.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(hour, minute);
 
   // TODO(ianh): Localize.
   String toString() => '$hourOfPeriodLabel:$minuteLabel $periodLabel';

packages/flutter/lib/src/painting/basic_types.dart

@@ -18,4 +18,6 @@ export 'dart:ui' show
   TextBaseline,
   TextDecoration,
   TextDecorationStyle,
-  VoidCallback;
+  VoidCallback,
+  hashValues,
+  hashList;

packages/flutter/lib/src/painting/box_painter.dart

@@ -39,12 +39,7 @@ class BorderSide {
            width == typedOther.width;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + color.hashCode;
-    value = 37 * value + width.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(color, width);
 
   String toString() => 'BorderSide($color, $width)';
 }
@@ -96,14 +91,7 @@ class Border {
            left == typedOther.left;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + top.hashCode;
-    value = 37 * value + right.hashCode;
-    value = 37 * value + bottom.hashCode;
-    value = 37 * value + left.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(top, right, bottom, left);
 
   String toString() => 'Border($top, $right, $bottom, $left)';
 }
@@ -198,14 +186,7 @@ class BoxShadow {
            spreadRadius == typedOther.spreadRadius;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + color.hashCode;
-    value = 37 * value + offset.hashCode;
-    value = 37 * value + blurRadius.hashCode;
-    value = 37 * value + spreadRadius.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(color, offset, blurRadius, spreadRadius);
 
   String toString() => 'BoxShadow($color, $offset, $blurRadius, $spreadRadius)';
 }
@@ -281,25 +262,7 @@ class LinearGradient extends Gradient {
     return true;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + begin.hashCode;
-    value = 37 * value + end.hashCode;
-    value = 37 * value + tileMode.hashCode;
-    if (colors != null) {
-      for (int i = 0; i < colors.length; i += 1)
-        value = 37 * value + colors[i].hashCode;
-    } else {
-      value = 37 * value + null.hashCode;
-    }
-    if (stops != null) {
-      for (int i = 0; i < stops.length; i += 1)
-        value = 37 * value + stops[i].hashCode;
-    } else {
-      value = 37 * value + null.hashCode;
-    }
-    return value;
-  }
+  int get hashCode => hashValues(begin, end, tileMode, hashList(colors), hashList(stops));
 
   String toString() {
     return 'LinearGradient($begin, $end, $colors, $stops, $tileMode)';
@@ -373,25 +336,7 @@ class RadialGradient extends Gradient {
     return true;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + center.hashCode;
-    value = 37 * value + radius.hashCode;
-    value = 37 * value + tileMode.hashCode;
-    if (colors != null) {
-      for (int i = 0; i < colors.length; i += 1)
-        value = 37 * value + colors[i].hashCode;
-    } else {
-      value = 37 * value + null.hashCode;
-    }
-    if (stops != null) {
-      for (int i = 0; i < stops.length; i += 1)
-        value = 37 * value + stops[i].hashCode;
-    } else {
-      value = 37 * value + null.hashCode;
-    }
-    return value;
-  }
+  int get hashCode => hashValues(center, radius, tileMode, hashList(colors), hashList(stops));
 
   String toString() {
     return 'RadialGradient($center, $radius, $colors, $stops, $tileMode)';
@@ -581,12 +526,7 @@ class FractionalOffset {
     return x == typedOther.x &&
            y == typedOther.y;
   }
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + x.hashCode;
-    value = 37 * value + y.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(x, y);
   static FractionalOffset lerp(FractionalOffset a, FractionalOffset b, double t) {
     if (a == null && b == null)
       return null;
@@ -682,16 +622,7 @@ class BackgroundImage {
            _imageResource == typedOther._imageResource;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + fit.hashCode;
-    value = 37 * value + repeat.hashCode;
-    value = 37 * value + centerSlice.hashCode;
-    value = 37 * value + colorFilter.hashCode;
-    value = 37 * value + alignment.hashCode;
-    value = 37 * value + _imageResource.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(fit, repeat, centerSlice, colorFilter, alignment, _imageResource);
 
   String toString() => 'BackgroundImage($fit, $repeat)';
 }
@@ -844,15 +775,15 @@ class BoxDecoration extends Decoration {
   }
 
   int get hashCode {
-    int value = 373;
-    value = 37 * value + backgroundColor.hashCode;
-    value = 37 * value + backgroundImage.hashCode;
-    value = 37 * value + border.hashCode;
-    value = 37 * value + borderRadius.hashCode;
-    value = 37 * value + boxShadow.hashCode;
-    value = 37 * value + gradient.hashCode;
-    value = 37 * value + shape.hashCode;
-    return value;
+    return hashValues(
+      backgroundColor,
+      backgroundImage,
+      border,
+      borderRadius,
+      boxShadow,
+      gradient,
+      shape
+    );
   }
 
   String toString([String prefix = '']) {

packages/flutter/lib/src/painting/colors.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui' show Color, lerpDouble;
+import 'dart:ui' show Color, lerpDouble, hashValues;
 
 class HSVColor {
   const HSVColor.fromAHSV(this.alpha, this.hue, this.saturation, this.value);
@@ -113,14 +113,7 @@ class HSVColor {
         && typedOther.value == value;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + alpha.hashCode;
-    value = 37 * value + hue.hashCode;
-    value = 37 * value + saturation.hashCode;
-    value = 37 * value + value.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(alpha, hue, saturation, value);
 
   String toString() => "HSVColor($alpha, $hue, $saturation, $value)";
 }

packages/flutter/lib/src/painting/edge_dims.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:ui' as ui;
+import 'dart:ui' show hashValues;
 
 /// An immutable set of offsets in each of the four cardinal directions.
 ///
@@ -136,14 +137,7 @@ class EdgeDims {
            left == typedOther.left;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + top.hashCode;
-    value = 37 * value + left.hashCode;
-    value = 37 * value + bottom.hashCode;
-    value = 37 * value + right.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(top, left, bottom, right);
 
   String toString() => "EdgeDims($top, $right, $bottom, $left)";
 }

packages/flutter/lib/src/painting/text_painter.dart

@@ -78,13 +78,7 @@ class StyledTextSpan extends TextSpan {
     return true;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + style.hashCode;
-    for (TextSpan child in children)
-      value = 37 * value + child.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(style, hashList(children));
 
   String toString([String prefix = '']) {
     List<String> result = <String>[];

packages/flutter/lib/src/painting/text_style.dart

@@ -163,21 +163,20 @@ class TextStyle {
   }
 
   int get hashCode {
-    // Use Quiver: https://github.com/domokit/mojo/issues/236
-    int value = 373;
-    value = 37 * value + inherit.hashCode;
-    value = 37 * value + color.hashCode;
-    value = 37 * value + fontFamily.hashCode;
-    value = 37 * value + fontSize.hashCode;
-    value = 37 * value + fontWeight.hashCode;
-    value = 37 * value + fontStyle.hashCode;
-    value = 37 * value + letterSpacing.hashCode;
-    value = 37 * value + textAlign.hashCode;
-    value = 37 * value + textBaseline.hashCode;
-    value = 37 * value + decoration.hashCode;
-    value = 37 * value + decorationColor.hashCode;
-    value = 37 * value + decorationStyle.hashCode;
-    return value;
+    return hashValues(
+      super.hashCode,
+      color,
+      fontFamily,
+      fontSize,
+      fontWeight,
+      fontStyle,
+      letterSpacing,
+      textAlign,
+      textBaseline,
+      decoration,
+      decorationColor,
+      decorationStyle
+    );
   }
 
   String toString([String prefix = '']) {

packages/flutter/lib/src/rendering/box.dart

@@ -4,6 +4,7 @@
 
 import 'dart:math' as math;
 import 'dart:ui' as ui;
+import 'dart:ui' show hashValues;
 
 import 'package:flutter/animation.dart';
 import 'package:flutter/gestures.dart';
@@ -272,12 +273,7 @@ class BoxConstraints extends Constraints {
 
   int get hashCode {
     assert(isNormalized);
-    int value = 373;
-    value = 37 * value + minWidth.hashCode;
-    value = 37 * value + maxWidth.hashCode;
-    value = 37 * value + minHeight.hashCode;
-    value = 37 * value + maxHeight.hashCode;
-    return value;
+    return hashValues(minWidth, maxWidth, minHeight, maxHeight);
   }
 
   String toString() {

packages/flutter/lib/src/rendering/stack.dart

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:math' as math;
-import 'dart:ui' show lerpDouble;
+import 'dart:ui' show lerpDouble, hashValues;
 
 import 'box.dart';
 import 'object.dart';
@@ -123,14 +123,7 @@ class RelativeRect {
            bottom == typedOther.bottom;
   }
 
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + left.hashCode;
-    value = 37 * value + top.hashCode;
-    value = 37 * value + right.hashCode;
-    value = 37 * value + bottom.hashCode;
-    return value;
-  }
+  int get hashCode => hashValues(left, top, right, bottom);
 
   String toString() => "RelativeRect.fromLTRB(${left.toStringAsFixed(1)}, ${top.toStringAsFixed(1)}, ${right.toStringAsFixed(1)}, ${bottom.toStringAsFixed(1)})";
 }

packages/flutter/lib/src/widgets/framework.dart

@@ -7,6 +7,7 @@ import 'dart:collection';
 
 import 'package:flutter/rendering.dart';
 
+export 'dart:ui' show hashValues, hashList;
 export 'package:flutter/rendering.dart' show debugPrint;
 
 // KEYS

packages/flutter/lib/src/widgets/mixed_viewport.dart

@@ -63,7 +63,7 @@ class _ChildKey {
     return type == typedOther.type &&
            key == typedOther.key;
   }
-  int get hashCode => ((373 * 37) + type.hashCode) * 37 + key.hashCode;
+  int get hashCode => hashValues(type, key);
   String toString() => "_ChildKey(type: $type, key: $key)";
 }
 

packages/flutter/lib/src/widgets/page_storage.dart

@@ -30,16 +30,7 @@ class _StorageEntryIdentifier {
     }
     return true;
   }
-  int get hashCode {
-    int value = 373;
-    value = 37 * value + clientType.hashCode;
-    value = 37 * value + scopeKey.hashCode;
-    if (keys != null) {
-      for (Key key in keys)
-        value = 37 * value + key.hashCode;
-    }
-    return value;
-  }
+  int get hashCode => hashValues(clientType, scopeKey, hashList(keys));
 }
 
 class PageStorageBucket {