Add missing transform == check for gradients (#91898)

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

@@ -118,6 +118,24 @@ class GradientRotation extends GradientTransform {
       ..translate(originX, originY)
       ..rotateZ(radians);
   }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other))
+      return true;
+    if (other.runtimeType != runtimeType)
+      return false;
+    return other is GradientRotation
+        && other.radians == radians;
+  }
+
+  @override
+  int get hashCode => radians.hashCode;
+
+  @override
+  String toString() {
+    return '${objectRuntimeType(this, 'GradientRotation')}(radians: ${debugFormatDouble(radians)})';
+  }
 }
 
 /// A 2D gradient.
@@ -495,16 +513,26 @@ class LinearGradient extends Gradient {
         && other.begin == begin
         && other.end == end
         && other.tileMode == tileMode
+        && other.transform == transform
         && listEquals<Color>(other.colors, colors)
         && listEquals<double>(other.stops, stops);
   }
 
   @override
-  int get hashCode => hashValues(begin, end, tileMode, hashList(colors), hashList(stops));
+  int get hashCode => hashValues(begin, end, tileMode, transform, hashList(colors), hashList(stops));
 
   @override
   String toString() {
-    return '${objectRuntimeType(this, 'LinearGradient')}($begin, $end, $colors, $stops, $tileMode)';
+    final List<String> description = <String>[
+      'begin: $begin',
+      'end: $end',
+      'colors: $colors',
+      if (stops != null) 'stops: $stops',
+      'tileMode: $tileMode',
+      if (transform != null) 'transform: $transform',
+    ];
+
+    return '${objectRuntimeType(this, 'LinearGradient')}(${description.join(', ')})';
   }
 }
 
@@ -757,6 +785,7 @@ class RadialGradient extends Gradient {
         && other.center == center
         && other.radius == radius
         && other.tileMode == tileMode
+        && other.transform == transform
         && listEquals<Color>(other.colors, colors)
         && listEquals<double>(other.stops, stops)
         && other.focal == focal
@@ -764,11 +793,22 @@ class RadialGradient extends Gradient {
   }
 
   @override
-  int get hashCode => hashValues(center, radius, tileMode, hashList(colors), hashList(stops), focal, focalRadius);
+  int get hashCode => hashValues(center, radius, tileMode, transform, hashList(colors), hashList(stops), focal, focalRadius);
 
   @override
   String toString() {
-    return '${objectRuntimeType(this, 'RadialGradient')}($center, $radius, $colors, $stops, $tileMode, $focal, $focalRadius)';
+    final List<String> description = <String>[
+      'center: $center',
+      'radius: ${debugFormatDouble(radius)}',
+      'colors: $colors',
+      if (stops != null) 'stops: $stops',
+      'tileMode: $tileMode',
+      if (focal != null) 'focal: $focal',
+      'focalRadius: ${debugFormatDouble(focalRadius)}',
+      if (transform != null) 'transform: $transform',
+    ];
+
+    return '${objectRuntimeType(this, 'RadialGradient')}(${description.join(', ')})';
   }
 }
 
@@ -1005,15 +1045,26 @@ class SweepGradient extends Gradient {
         && other.startAngle == startAngle
         && other.endAngle == endAngle
         && other.tileMode == tileMode
+        && other.transform == transform
         && listEquals<Color>(other.colors, colors)
         && listEquals<double>(other.stops, stops);
   }
 
   @override
-  int get hashCode => hashValues(center, startAngle, endAngle, tileMode, hashList(colors), hashList(stops));
+  int get hashCode => hashValues(center, startAngle, endAngle, tileMode, transform, hashList(colors), hashList(stops));
 
   @override
   String toString() {
-    return '${objectRuntimeType(this, 'SweepGradient')}($center, $startAngle, $endAngle, $colors, $stops, $tileMode)';
+    final List<String> description = <String>[
+      'center: $center',
+      'startAngle: ${debugFormatDouble(startAngle)}',
+      'endAngle: ${debugFormatDouble(endAngle)}',
+      'colors: $colors',
+      if (stops != null) 'stops: $stops',
+      'tileMode: $tileMode',
+      if (transform != null) 'transform: $transform',
+    ];
+
+    return '${objectRuntimeType(this, 'SweepGradient')}(${description.join(', ')})';
   }
 }

packages/flutter/test/painting/gradient_test.dart

@@ -184,17 +184,51 @@ void main() {
       const LinearGradient(
         begin: Alignment.topLeft,
         end: Alignment.bottomLeft,
+        transform: GradientRotation(1.6),
         colors: <Color>[
           Color(0x33333333),
           Color(0x66666666),
         ],
       ).toString(),
       equals(
-        'LinearGradient(Alignment.topLeft, Alignment.bottomLeft, [Color(0x33333333), Color(0x66666666)], null, TileMode.clamp)',
+        'LinearGradient(begin: Alignment.topLeft, end: Alignment.bottomLeft, colors: [Color(0x33333333), Color(0x66666666)], tileMode: TileMode.clamp, transform: GradientRotation(radians: 1.6))',
       ),
     );
   });
 
+  test('LinearGradient with different transforms', () {
+    const LinearGradient testGradient1 = LinearGradient(
+      transform: GradientRotation(math.pi/4),
+      colors: <Color>[
+        Color(0x33333333),
+        Color(0x66666666),
+      ],
+    );
+    const LinearGradient testGradient1Copy = LinearGradient(
+      transform: GradientRotation(math.pi/4),
+      colors: <Color>[
+        Color(0x33333333),
+        Color(0x66666666),
+      ],
+    );
+    const LinearGradient testGradient2 = LinearGradient(
+      transform: GradientRotation(math.pi/2),
+      colors: <Color>[
+        Color(0x33333333),
+        Color(0x66666666),
+      ],
+    );
+
+    expect(
+      testGradient1,
+      equals(testGradient1Copy),
+    );
+    expect(
+      testGradient1,
+      isNot(equals(testGradient2)),
+    );
+  });
+
   test('LinearGradient with AlignmentDirectional', () {
     expect(
       () {