106 lines
3.1 KiB
Dart
106 lines
3.1 KiB
Dart
import 'package:flutter/material.dart';
|
||
|
||
/// 数字货币图标组件
|
||
///
|
||
/// 支持离线图标和兜底显示
|
||
class CoinIcon extends StatelessWidget {
|
||
final String symbol; // 币种代码，如 'BTC', 'ETH'
|
||
final double size; // 图标大小，默认 40
|
||
final bool isCircle; // 是否圆形背景，默认 false
|
||
|
||
const CoinIcon({
|
||
super.key,
|
||
required this.symbol,
|
||
this.size = 40,
|
||
this.isCircle = false,
|
||
});
|
||
|
||
// 币种代码到文件名的映射
|
||
static const Map<String, String> _coinFileMap = {
|
||
'BTC': 'btc',
|
||
'ETH': 'eth',
|
||
'USDT': 'usdt',
|
||
'BNB': 'bnb',
|
||
'SOL': 'sol',
|
||
'XRP': 'xrp',
|
||
'ADA': 'ada',
|
||
'DOGE': 'doge',
|
||
'DOT': 'dot',
|
||
'MATIC': 'matic',
|
||
'SHIB': 'shib',
|
||
'LTC': 'ltc',
|
||
'AVAX': 'avax',
|
||
'LINK': 'link',
|
||
'UNI': 'uni',
|
||
'ATOM': 'atom',
|
||
};
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
final normalizedSymbol = symbol.toUpperCase();
|
||
final fileName = _coinFileMap[normalizedSymbol];
|
||
|
||
Widget icon;
|
||
|
||
if (fileName != null) {
|
||
// 尝试加载本地图标
|
||
icon = Image.asset(
|
||
'assets/icons/crypto/$fileName.png',
|
||
width: size,
|
||
height: size,
|
||
fit: BoxFit.contain,
|
||
errorBuilder: (context, error, stackTrace) {
|
||
// 加载失败，显示兜底UI
|
||
return _buildFallback(context, normalizedSymbol);
|
||
},
|
||
);
|
||
} else {
|
||
// 没有对应的图标，显示兜底UI
|
||
icon = _buildFallback(context, normalizedSymbol);
|
||
}
|
||
|
||
if (isCircle) {
|
||
return Container(
|
||
width: size,
|
||
height: size,
|
||
decoration: BoxDecoration(
|
||
shape: BoxShape.circle,
|
||
color: Theme.of(context).colorScheme.surfaceContainerHigh,
|
||
),
|
||
child: Center(child: icon),
|
||
);
|
||
}
|
||
|
||
return icon;
|
||
}
|
||
|
||
/// 构建兜底UI（显示币种代码）
|
||
Widget _buildFallback(BuildContext context, String symbol) {
|
||
return Container(
|
||
width: size,
|
||
height: size,
|
||
decoration: BoxDecoration(
|
||
shape: BoxShape.circle,
|
||
gradient: LinearGradient(
|
||
begin: Alignment.topLeft,
|
||
end: Alignment.bottomRight,
|
||
colors: [
|
||
Theme.of(context).colorScheme.primary,
|
||
Theme.of(context).colorScheme.secondary,
|
||
],
|
||
),
|
||
),
|
||
child: Center(
|
||
child: Text(
|
||
symbol.length > 3 ? symbol.substring(0, 3) : symbol,
|
||
style: TextStyle(
|
||
color: Colors.white,
|
||
fontSize: size * 0.35,
|
||
fontWeight: FontWeight.bold,
|
||
),
|
||
),
|
||
),
|
||
);
|
||
}
|
||
}
|