generated from dellevin/template
73 lines
1.9 KiB
Dart
73 lines
1.9 KiB
Dart
import 'package:flutter/material.dart';
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import 'fade_in_local_image.dart';
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/// 人物头像。
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///
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/// 有照片时显示照片；无照片时根据名字哈希从调色板取色，
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/// 显示首字占位（同一人物始终同色）。
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class PersonAvatar extends StatelessWidget {
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final String? photoPath;
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final String name;
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final double size;
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final double fontSize;
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const PersonAvatar({
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super.key,
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required this.photoPath,
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required this.name,
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required this.size,
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required this.fontSize,
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});
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// 固定调色板：背景为该色的低透明度，文字为该色本身。
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static const _palette = <Color>[
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Color(0xFF4A90D9), // 蓝
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Color(0xFF009688), // 青
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Color(0xFFE91E63), // 粉
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Color(0xFF7E57C2), // 紫
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Color(0xFFFF7043), // 橙
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Color(0xFF4CAF50), // 绿
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Color(0xFFFF9800), // 琥珀
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Color(0xFF795548), // 棕
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Color(0xFF5C6BC0), // 靛
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Color(0xFFEC407A), // 玫红
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];
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Color _colorFor(String name) {
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var hash = 0;
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for (final c in name.codeUnits) {
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hash = (hash * 31 + c) & 0x7fffffff;
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}
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return _palette[hash % _palette.length];
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}
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@override
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Widget build(BuildContext context) {
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final hasPhoto = photoPath != null && photoPath!.isNotEmpty;
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final color = _colorFor(name);
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final initial = name.isNotEmpty ? name[0] : '?';
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return Container(
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width: size,
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height: size,
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decoration: BoxDecoration(
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color: hasPhoto ? null : color.withValues(alpha: 0.15),
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shape: BoxShape.circle,
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),
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clipBehavior: Clip.antiAlias,
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child: hasPhoto
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? FadeInLocalImage(path: photoPath, fit: BoxFit.cover)
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: Center(
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child: Text(
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initial,
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style: TextStyle(
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fontSize: fontSize,
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fontWeight: FontWeight.w600,
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color: color,
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),
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),
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),
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);
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}
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}
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