packages/flutter/lib/src/painting/rounded_rectangle_border.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:ui' as ui show lerpDouble;

 import 'package:flutter/foundation.dart';

 import 'basic_types.dart';
 import 'border_radius.dart';
 import 'borders.dart';
 import 'circle_border.dart';

 /// A rectangular border with rounded corners.
 ///
 /// Typically used with [ShapeDecoration] to draw a box with a rounded
 /// rectangle.
 ///
 /// This shape can interpolate to and from [CircleBorder].
 ///
 /// See also:
 ///
 ///  * [BorderSide], which is used to describe each side of the box.
 ///  * [Border], which, when used with [BoxDecoration], can also
 ///    describe a rounded rectangle.
 class RoundedRectangleBorder extends OutlinedBorder {
   /// Creates a rounded rectangle border.
   ///
   /// The arguments must not be null.
   const RoundedRectangleBorder({
     super.side,
     this.borderRadius = BorderRadius.zero,
   }) : assert(side != null),
        assert(borderRadius != null);

   /// The radii for each corner.
   final BorderRadiusGeometry borderRadius;

   @override
   ShapeBorder scale(double t) {
     return RoundedRectangleBorder(
       side: side.scale(t),
       borderRadius: borderRadius * t,
     );
   }

   @override
   ShapeBorder? lerpFrom(ShapeBorder? a, double t) {
     assert(t != null);
     if (a is RoundedRectangleBorder) {
       return RoundedRectangleBorder(
         side: BorderSide.lerp(a.side, side, t),
         borderRadius: BorderRadiusGeometry.lerp(a.borderRadius, borderRadius, t)!,
       );
     }
     if (a is CircleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(a.side, side, t),
         borderRadius: borderRadius,
         circleness: 1.0 - t,
         eccentricity: a.eccentricity,
       );
     }
     return super.lerpFrom(a, t);
   }

   @override
   ShapeBorder? lerpTo(ShapeBorder? b, double t) {
     assert(t != null);
     if (b is RoundedRectangleBorder) {
       return RoundedRectangleBorder(
         side: BorderSide.lerp(side, b.side, t),
         borderRadius: BorderRadiusGeometry.lerp(borderRadius, b.borderRadius, t)!,
       );
     }
     if (b is CircleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(side, b.side, t),
         borderRadius: borderRadius,
         circleness: t,
         eccentricity: b.eccentricity,
       );
     }
     return super.lerpTo(b, t);
   }

   /// Returns a copy of this RoundedRectangleBorder with the given fields
   /// replaced with the new values.
   @override
   RoundedRectangleBorder copyWith({ BorderSide? side, BorderRadiusGeometry? borderRadius }) {
     return RoundedRectangleBorder(
       side: side ?? this.side,
       borderRadius: borderRadius ?? this.borderRadius,
     );
   }

   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
     final RRect adjustedRect = borderRect.deflate(side.strokeInset);
     return Path()
       ..addRRect(adjustedRect);
   }

   @override
   Path getOuterPath(Rect rect, { TextDirection? textDirection }) {
     return Path()
       ..addRRect(borderRadius.resolve(textDirection).toRRect(rect));
   }

   @override
   void paintInterior(Canvas canvas, Rect rect, Paint paint, { TextDirection? textDirection }) {
     if (borderRadius == BorderRadius.zero) {
       canvas.drawRect(rect, paint);
     } else {
       canvas.drawRRect(borderRadius.resolve(textDirection).toRRect(rect), paint);
     }
   }

   @override
   bool get preferPaintInterior => true;

   @override
   void paint(Canvas canvas, Rect rect, { TextDirection? textDirection }) {
     switch (side.style) {
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
         if (side.width == 0.0) {
           canvas.drawRRect(borderRadius.resolve(textDirection).toRRect(rect), side.toPaint());
         } else {
           final Paint paint = Paint()
             ..color = side.color;
           final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
           final RRect inner = borderRect.deflate(side.strokeInset);
           final RRect outer = borderRect.inflate(side.strokeOutset);
           canvas.drawDRRect(outer, inner, paint);
         }
         break;
     }
   }

   @override
   bool operator ==(Object other) {
     if (other.runtimeType != runtimeType) {
       return false;
     }
     return other is RoundedRectangleBorder
         && other.side == side
         && other.borderRadius == borderRadius;
   }

   @override
   int get hashCode => Object.hash(side, borderRadius);

   @override
   String toString() {
     return '${objectRuntimeType(this, 'RoundedRectangleBorder')}($side, $borderRadius)';
   }
 }

 class _RoundedRectangleToCircleBorder extends OutlinedBorder {
   const _RoundedRectangleToCircleBorder({
     super.side,
     this.borderRadius = BorderRadius.zero,
     required this.circleness,
     required this.eccentricity,
   }) : assert(side != null),
        assert(borderRadius != null),
        assert(circleness != null);

   final BorderRadiusGeometry borderRadius;
   final double circleness;
   final double eccentricity;

   @override
   ShapeBorder scale(double t) {
     return _RoundedRectangleToCircleBorder(
       side: side.scale(t),
       borderRadius: borderRadius * t,
       circleness: t,
       eccentricity: eccentricity,
     );
   }

   @override
   ShapeBorder? lerpFrom(ShapeBorder? a, double t) {
     assert(t != null);
     if (a is RoundedRectangleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(a.side, side, t),
         borderRadius: BorderRadiusGeometry.lerp(a.borderRadius, borderRadius, t)!,
         circleness: circleness * t,
         eccentricity: eccentricity,
       );
     }
     if (a is CircleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(a.side, side, t),
         borderRadius: borderRadius,
         circleness: circleness + (1.0 - circleness) * (1.0 - t),
         eccentricity: a.eccentricity,
       );
     }
     if (a is _RoundedRectangleToCircleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(a.side, side, t),
         borderRadius: BorderRadiusGeometry.lerp(a.borderRadius, borderRadius, t)!,
         circleness: ui.lerpDouble(a.circleness, circleness, t)!,
         eccentricity: eccentricity,
       );
     }
     return super.lerpFrom(a, t);
   }

   @override
   ShapeBorder? lerpTo(ShapeBorder? b, double t) {
     if (b is RoundedRectangleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(side, b.side, t),
         borderRadius: BorderRadiusGeometry.lerp(borderRadius, b.borderRadius, t)!,
         circleness: circleness * (1.0 - t),
         eccentricity: eccentricity,
       );
     }
     if (b is CircleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(side, b.side, t),
         borderRadius: borderRadius,
         circleness: circleness + (1.0 - circleness) * t,
         eccentricity: b.eccentricity,
       );
     }
     if (b is _RoundedRectangleToCircleBorder) {
       return _RoundedRectangleToCircleBorder(
         side: BorderSide.lerp(side, b.side, t),
         borderRadius: BorderRadiusGeometry.lerp(borderRadius, b.borderRadius, t)!,
         circleness: ui.lerpDouble(circleness, b.circleness, t)!,
         eccentricity: eccentricity,
       );
     }
     return super.lerpTo(b, t);
   }

   Rect _adjustRect(Rect rect) {
     if (circleness == 0.0 || rect.width == rect.height) {
       return rect;
     }
     if (rect.width < rect.height) {
       final double partialDelta = (rect.height - rect.width) / 2;
       final double delta = circleness * partialDelta * (1.0 - eccentricity);
       return Rect.fromLTRB(
         rect.left,
         rect.top + delta,
         rect.right,
         rect.bottom - delta,
       );
     } else {
       final double partialDelta = (rect.width - rect.height) / 2;
       final double delta = circleness * partialDelta * (1.0 - eccentricity);
       return Rect.fromLTRB(
         rect.left + delta,
         rect.top,
         rect.right - delta,
         rect.bottom,
       );
     }
   }

   BorderRadius? _adjustBorderRadius(Rect rect, TextDirection? textDirection) {
     final BorderRadius resolvedRadius = borderRadius.resolve(textDirection);
     if (circleness == 0.0) {
       return resolvedRadius;
     }
     if (eccentricity != 0.0) {
       if (rect.width < rect.height) {
         return BorderRadius.lerp(
           resolvedRadius,
           BorderRadius.all(Radius.elliptical(rect.width / 2, (0.5 + eccentricity / 2) * rect.height / 2)),
           circleness,
         )!;
       } else {
         return BorderRadius.lerp(
           resolvedRadius,
           BorderRadius.all(Radius.elliptical((0.5 + eccentricity / 2) * rect.width / 2, rect.height / 2)),
           circleness,
         )!;
       }
     }
     return BorderRadius.lerp(resolvedRadius, BorderRadius.circular(rect.shortestSide / 2), circleness);
   }

   @override
   Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
     final RRect borderRect = _adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect));
     final RRect adjustedRect = borderRect.deflate(ui.lerpDouble(side.width, 0, side.strokeAlign)!);
     return Path()
       ..addRRect(adjustedRect);
   }

   @override
   Path getOuterPath(Rect rect, { TextDirection? textDirection }) {
     return Path()
       ..addRRect(_adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect)));
   }

   @override
   void paintInterior(Canvas canvas, Rect rect, Paint paint, { TextDirection? textDirection }) {
     final BorderRadius adjustedBorderRadius = _adjustBorderRadius(rect, textDirection)!;
     if (adjustedBorderRadius == BorderRadius.zero) {
       canvas.drawRect(_adjustRect(rect), paint);
     } else {
       canvas.drawRRect(adjustedBorderRadius.toRRect(_adjustRect(rect)), paint);
     }
   }

   @override
   bool get preferPaintInterior => true;

   @override
   _RoundedRectangleToCircleBorder copyWith({ BorderSide? side, BorderRadiusGeometry? borderRadius, double? circleness, double? eccentricity }) {
     return _RoundedRectangleToCircleBorder(
       side: side ?? this.side,
       borderRadius: borderRadius ?? this.borderRadius,
       circleness: circleness ?? this.circleness,
       eccentricity: eccentricity ?? this.eccentricity,
     );
   }

   @override
   void paint(Canvas canvas, Rect rect, { TextDirection? textDirection }) {
     switch (side.style) {
       case BorderStyle.none:
         break;
       case BorderStyle.solid:
         final BorderRadius adjustedBorderRadius = _adjustBorderRadius(rect, textDirection)!;
         final RRect borderRect = adjustedBorderRadius.toRRect(_adjustRect(rect));
         canvas.drawRRect(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
     }
   }

   @override
   bool operator ==(Object other) {
     if (other.runtimeType != runtimeType) {
       return false;
     }
     return other is _RoundedRectangleToCircleBorder
         && other.side == side
         && other.borderRadius == borderRadius
         && other.circleness == circleness;
   }

   @override
   int get hashCode => Object.hash(side, borderRadius, circleness);

   @override
   String toString() {
     if (eccentricity != 0.0) {
       return 'RoundedRectangleBorder($side, $borderRadius, ${(circleness * 100).toStringAsFixed(1)}% of the way to being a CircleBorder that is ${(eccentricity * 100).toStringAsFixed(1)}% oval)';
     }
     return 'RoundedRectangleBorder($side, $borderRadius, ${(circleness * 100).toStringAsFixed(1)}% of the way to being a CircleBorder)';
   }
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:ui' as ui show lerpDouble;

	import 'package:flutter/foundation.dart';

	import 'basic_types.dart';
	import 'border_radius.dart';
	import 'borders.dart';
	import 'circle_border.dart';

	/// A rectangular border with rounded corners.
	///
	/// Typically used with [ShapeDecoration] to draw a box with a rounded
	/// rectangle.
	///
	/// This shape can interpolate to and from [CircleBorder].
	///
	/// See also:
	///
	/// * [BorderSide], which is used to describe each side of the box.
	/// * [Border], which, when used with [BoxDecoration], can also
	/// describe a rounded rectangle.
	class RoundedRectangleBorder extends OutlinedBorder {
	/// Creates a rounded rectangle border.
	///
	/// The arguments must not be null.
	const RoundedRectangleBorder({
	super.side,
	this.borderRadius = BorderRadius.zero,
	}) : assert(side != null),
	assert(borderRadius != null);

	/// The radii for each corner.
	final BorderRadiusGeometry borderRadius;

	@override
	ShapeBorder scale(double t) {
	return RoundedRectangleBorder(
	side: side.scale(t),
	borderRadius: borderRadius * t,
	);
	}

	@override
	ShapeBorder? lerpFrom(ShapeBorder? a, double t) {
	assert(t != null);
	if (a is RoundedRectangleBorder) {
	return RoundedRectangleBorder(
	side: BorderSide.lerp(a.side, side, t),
	borderRadius: BorderRadiusGeometry.lerp(a.borderRadius, borderRadius, t)!,
	);
	}
	if (a is CircleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(a.side, side, t),
	borderRadius: borderRadius,
	circleness: 1.0 - t,
	eccentricity: a.eccentricity,
	);
	}
	return super.lerpFrom(a, t);
	}

	@override
	ShapeBorder? lerpTo(ShapeBorder? b, double t) {
	assert(t != null);
	if (b is RoundedRectangleBorder) {
	return RoundedRectangleBorder(
	side: BorderSide.lerp(side, b.side, t),
	borderRadius: BorderRadiusGeometry.lerp(borderRadius, b.borderRadius, t)!,
	);
	}
	if (b is CircleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(side, b.side, t),
	borderRadius: borderRadius,
	circleness: t,
	eccentricity: b.eccentricity,
	);
	}
	return super.lerpTo(b, t);
	}

	/// Returns a copy of this RoundedRectangleBorder with the given fields
	/// replaced with the new values.
	@override
	RoundedRectangleBorder copyWith({ BorderSide? side, BorderRadiusGeometry? borderRadius }) {
	return RoundedRectangleBorder(
	side: side ?? this.side,
	borderRadius: borderRadius ?? this.borderRadius,
	);
	}

	@override
	Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
	final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
	final RRect adjustedRect = borderRect.deflate(side.strokeInset);
	return Path()
	..addRRect(adjustedRect);
	}

	@override
	Path getOuterPath(Rect rect, { TextDirection? textDirection }) {
	return Path()
	..addRRect(borderRadius.resolve(textDirection).toRRect(rect));
	}

	@override
	void paintInterior(Canvas canvas, Rect rect, Paint paint, { TextDirection? textDirection }) {
	if (borderRadius == BorderRadius.zero) {
	canvas.drawRect(rect, paint);
	} else {
	canvas.drawRRect(borderRadius.resolve(textDirection).toRRect(rect), paint);
	}
	}

	@override
	bool get preferPaintInterior => true;

	@override
	void paint(Canvas canvas, Rect rect, { TextDirection? textDirection }) {
	switch (side.style) {
	case BorderStyle.none:
	break;
	case BorderStyle.solid:
	if (side.width == 0.0) {
	canvas.drawRRect(borderRadius.resolve(textDirection).toRRect(rect), side.toPaint());
	} else {
	final Paint paint = Paint()
	..color = side.color;
	final RRect borderRect = borderRadius.resolve(textDirection).toRRect(rect);
	final RRect inner = borderRect.deflate(side.strokeInset);
	final RRect outer = borderRect.inflate(side.strokeOutset);
	canvas.drawDRRect(outer, inner, paint);
	}
	break;
	}
	}

	@override
	bool operator ==(Object other) {
	if (other.runtimeType != runtimeType) {
	return false;
	}
	return other is RoundedRectangleBorder
	&& other.side == side
	&& other.borderRadius == borderRadius;
	}

	@override
	int get hashCode => Object.hash(side, borderRadius);

	@override
	String toString() {
	return '${objectRuntimeType(this, 'RoundedRectangleBorder')}($side, $borderRadius)';
	}
	}

	class _RoundedRectangleToCircleBorder extends OutlinedBorder {
	const _RoundedRectangleToCircleBorder({
	super.side,
	this.borderRadius = BorderRadius.zero,
	required this.circleness,
	required this.eccentricity,
	}) : assert(side != null),
	assert(borderRadius != null),
	assert(circleness != null);

	final BorderRadiusGeometry borderRadius;
	final double circleness;
	final double eccentricity;

	@override
	ShapeBorder scale(double t) {
	return _RoundedRectangleToCircleBorder(
	side: side.scale(t),
	borderRadius: borderRadius * t,
	circleness: t,
	eccentricity: eccentricity,
	);
	}

	@override
	ShapeBorder? lerpFrom(ShapeBorder? a, double t) {
	assert(t != null);
	if (a is RoundedRectangleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(a.side, side, t),
	borderRadius: BorderRadiusGeometry.lerp(a.borderRadius, borderRadius, t)!,
	circleness: circleness * t,
	eccentricity: eccentricity,
	);
	}
	if (a is CircleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(a.side, side, t),
	borderRadius: borderRadius,
	circleness: circleness + (1.0 - circleness) * (1.0 - t),
	eccentricity: a.eccentricity,
	);
	}
	if (a is _RoundedRectangleToCircleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(a.side, side, t),
	borderRadius: BorderRadiusGeometry.lerp(a.borderRadius, borderRadius, t)!,
	circleness: ui.lerpDouble(a.circleness, circleness, t)!,
	eccentricity: eccentricity,
	);
	}
	return super.lerpFrom(a, t);
	}

	@override
	ShapeBorder? lerpTo(ShapeBorder? b, double t) {
	if (b is RoundedRectangleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(side, b.side, t),
	borderRadius: BorderRadiusGeometry.lerp(borderRadius, b.borderRadius, t)!,
	circleness: circleness * (1.0 - t),
	eccentricity: eccentricity,
	);
	}
	if (b is CircleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(side, b.side, t),
	borderRadius: borderRadius,
	circleness: circleness + (1.0 - circleness) * t,
	eccentricity: b.eccentricity,
	);
	}
	if (b is _RoundedRectangleToCircleBorder) {
	return _RoundedRectangleToCircleBorder(
	side: BorderSide.lerp(side, b.side, t),
	borderRadius: BorderRadiusGeometry.lerp(borderRadius, b.borderRadius, t)!,
	circleness: ui.lerpDouble(circleness, b.circleness, t)!,
	eccentricity: eccentricity,
	);
	}
	return super.lerpTo(b, t);
	}

	Rect _adjustRect(Rect rect) {
	if (circleness == 0.0 \|\| rect.width == rect.height) {
	return rect;
	}
	if (rect.width < rect.height) {
	final double partialDelta = (rect.height - rect.width) / 2;
	final double delta = circleness * partialDelta * (1.0 - eccentricity);
	return Rect.fromLTRB(
	rect.left,
	rect.top + delta,
	rect.right,
	rect.bottom - delta,
	);
	} else {
	final double partialDelta = (rect.width - rect.height) / 2;
	final double delta = circleness * partialDelta * (1.0 - eccentricity);
	return Rect.fromLTRB(
	rect.left + delta,
	rect.top,
	rect.right - delta,
	rect.bottom,
	);
	}
	}

	BorderRadius? _adjustBorderRadius(Rect rect, TextDirection? textDirection) {
	final BorderRadius resolvedRadius = borderRadius.resolve(textDirection);
	if (circleness == 0.0) {
	return resolvedRadius;
	}
	if (eccentricity != 0.0) {
	if (rect.width < rect.height) {
	return BorderRadius.lerp(
	resolvedRadius,
	BorderRadius.all(Radius.elliptical(rect.width / 2, (0.5 + eccentricity / 2) * rect.height / 2)),
	circleness,
	)!;
	} else {
	return BorderRadius.lerp(
	resolvedRadius,
	BorderRadius.all(Radius.elliptical((0.5 + eccentricity / 2) * rect.width / 2, rect.height / 2)),
	circleness,
	)!;
	}
	}
	return BorderRadius.lerp(resolvedRadius, BorderRadius.circular(rect.shortestSide / 2), circleness);
	}

	@override
	Path getInnerPath(Rect rect, { TextDirection? textDirection }) {
	final RRect borderRect = _adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect));
	final RRect adjustedRect = borderRect.deflate(ui.lerpDouble(side.width, 0, side.strokeAlign)!);
	return Path()
	..addRRect(adjustedRect);
	}

	@override
	Path getOuterPath(Rect rect, { TextDirection? textDirection }) {
	return Path()
	..addRRect(_adjustBorderRadius(rect, textDirection)!.toRRect(_adjustRect(rect)));
	}

	@override
	void paintInterior(Canvas canvas, Rect rect, Paint paint, { TextDirection? textDirection }) {
	final BorderRadius adjustedBorderRadius = _adjustBorderRadius(rect, textDirection)!;
	if (adjustedBorderRadius == BorderRadius.zero) {
	canvas.drawRect(_adjustRect(rect), paint);
	} else {
	canvas.drawRRect(adjustedBorderRadius.toRRect(_adjustRect(rect)), paint);
	}
	}

	@override
	bool get preferPaintInterior => true;

	@override
	_RoundedRectangleToCircleBorder copyWith({ BorderSide? side, BorderRadiusGeometry? borderRadius, double? circleness, double? eccentricity }) {
	return _RoundedRectangleToCircleBorder(
	side: side ?? this.side,
	borderRadius: borderRadius ?? this.borderRadius,
	circleness: circleness ?? this.circleness,
	eccentricity: eccentricity ?? this.eccentricity,
	);
	}

	@override
	void paint(Canvas canvas, Rect rect, { TextDirection? textDirection }) {
	switch (side.style) {
	case BorderStyle.none:
	break;
	case BorderStyle.solid:
	final BorderRadius adjustedBorderRadius = _adjustBorderRadius(rect, textDirection)!;
	final RRect borderRect = adjustedBorderRadius.toRRect(_adjustRect(rect));
	canvas.drawRRect(borderRect.inflate(side.strokeOffset / 2), side.toPaint());
	}
	}

	@override
	bool operator ==(Object other) {
	if (other.runtimeType != runtimeType) {
	return false;
	}
	return other is _RoundedRectangleToCircleBorder
	&& other.side == side
	&& other.borderRadius == borderRadius
	&& other.circleness == circleness;
	}

	@override
	int get hashCode => Object.hash(side, borderRadius, circleness);

	@override
	String toString() {
	if (eccentricity != 0.0) {
	return 'RoundedRectangleBorder($side, $borderRadius, ${(circleness * 100).toStringAsFixed(1)}% of the way to being a CircleBorder that is ${(eccentricity * 100).toStringAsFixed(1)}% oval)';
	}
	return 'RoundedRectangleBorder($side, $borderRadius, ${(circleness * 100).toStringAsFixed(1)}% of the way to being a CircleBorder)';
	}
	}