blob: 13fd9ced093e414c7d46b54a2aa7f3b1772c31c8 [file] [log] [blame]
// Copyright 2019 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
class BorderTabIndicator extends Decoration {
const BorderTabIndicator({this.indicatorHeight, this.textScaleFactor})
: super();
final double indicatorHeight;
final double textScaleFactor;
@override
_BorderPainter createBoxPainter([VoidCallback onChanged]) {
return _BorderPainter(this, indicatorHeight, textScaleFactor, onChanged);
}
}
class _BorderPainter extends BoxPainter {
_BorderPainter(
this.decoration,
this.indicatorHeight,
this.textScaleFactor,
VoidCallback onChanged,
) : assert(decoration != null),
assert(indicatorHeight >= 0),
super(onChanged);
final BorderTabIndicator decoration;
final double indicatorHeight;
final double textScaleFactor;
@override
void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) {
assert(configuration != null);
assert(configuration.size != null);
final horizontalInset = 16 - 4 * textScaleFactor;
final rect = Offset(offset.dx + horizontalInset,
(configuration.size.height / 2) - indicatorHeight / 2 - 1) &
Size(configuration.size.width - 2 * horizontalInset, indicatorHeight);
final paint = Paint();
paint.color = Colors.white;
paint.style = PaintingStyle.stroke;
paint.strokeWidth = 2;
canvas.drawRRect(
RRect.fromRectAndRadius(rect, const Radius.circular(56)),
paint,
);
}
}