79 lines
2.3 KiB
Dart
79 lines
2.3 KiB
Dart
// Author: fruit.com.cn
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import 'dart:math' as math;
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import 'package:flutter/material.dart';
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/// 首页右上角搜索/礼物图标的自定义样式：
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/// 搜索为粗线条放大镜（Material 图标无法调线条粗细），礼物为 emoji 红金礼盒。
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/// 粗线条白色放大镜，圆环在左上、手柄朝右下。
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class SearchGlyph extends StatelessWidget {
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const SearchGlyph({super.key, required this.size, required this.color});
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final double size;
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final Color color;
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@override
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Widget build(BuildContext context) {
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return CustomPaint(
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size: Size.square(size),
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painter: _SearchPainter(color: color),
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);
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}
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}
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class _SearchPainter extends CustomPainter {
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const _SearchPainter({required this.color});
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final Color color;
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@override
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void paint(Canvas canvas, Size size) {
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final stroke = size.width * 0.09;
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final paint = Paint()
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..color = color
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..style = PaintingStyle.stroke
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..strokeWidth = stroke
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..strokeCap = StrokeCap.round;
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final circleDiameter = size.width * 0.7;
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final direction = math.pi / 4;
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// 图形只占画布左上角，先平移让它视觉居中，否则会比文字基线偏高。
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final drawnExtent =
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circleDiameter / 2 +
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(circleDiameter / 2 + size.width * 0.12) * math.sin(direction) +
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stroke / 2;
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final centering = (size.width - drawnExtent) / 2;
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canvas.translate(centering, centering);
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final center = Offset(circleDiameter / 2, circleDiameter / 2);
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canvas.drawCircle(center, circleDiameter / 2 - stroke / 2, paint);
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final start = center + Offset.fromDirection(direction, circleDiameter / 2 - stroke * 0.2);
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final end = center + Offset.fromDirection(direction, circleDiameter / 2 + size.width * 0.12);
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canvas.drawLine(start, end, paint);
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}
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@override
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bool shouldRepaint(covariant _SearchPainter oldDelegate) =>
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oldDelegate.color != color;
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}
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/// emoji 礼盒（红盒金丝带，随系统 emoji 风格渲染）。
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class GiftGlyph extends StatelessWidget {
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const GiftGlyph({super.key, required this.size});
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final double size;
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@override
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Widget build(BuildContext context) {
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return SizedBox.square(
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dimension: size,
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child: FittedBox(
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child: Text('🎁', style: TextStyle(fontSize: size, height: 1)),
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),
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);
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}
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}
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