feat: 添加K线图功能 - interactive_chart + 多币种切换 + 技术指标(MA/EMA/BOLL/VOL)

flutter_monisuo/lib/providers/chart_provider.dart

@@ -0,0 +1,205 @@
+import 'package:flutter/foundation.dart';
+import 'package:interactive_chart/interactive_chart.dart';
+import '../models/candle.dart';
+
+/// 时间周期
+enum ChartInterval {
+  min1('1分', '1m'),
+  min5('5分', '5m'),
+  min15('15分', '15m'),
+  hour1('1小时', '1h'),
+  hour4('4小时', '4h'),
+  day1('1天', '1d');
+
+  final String label;
+  final String value;
+  const ChartInterval(this.label, this.value);
+}
+
+/// 技术指标开关
+class IndicatorSettings {
+  final bool showMA;
+  final bool showEMA;
+  final bool showBOLL;
+  final bool showVOL;
+  final int maPeriod;
+  final int emaPeriod;
+  final int bollPeriod;
+
+  const IndicatorSettings({
+    this.showMA = true,
+    this.showEMA = false,
+    this.showBOLL = false,
+    this.showVOL = true,
+    this.maPeriod = 7,
+    this.emaPeriod = 14,
+    this.bollPeriod = 20,
+  });
+
+  IndicatorSettings copyWith({
+    bool? showMA,
+    bool? showEMA,
+    bool? showBOLL,
+    bool? showVOL,
+    int? maPeriod,
+    int? emaPeriod,
+    int? bollPeriod,
+  }) {
+    return IndicatorSettings(
+      showMA: showMA ?? this.showMA,
+      showEMA: showEMA ?? this.showEMA,
+      showBOLL: showBOLL ?? this.showBOLL,
+      showVOL: showVOL ?? this.showVOL,
+      maPeriod: maPeriod ?? this.maPeriod,
+      emaPeriod: emaPeriod ?? this.emaPeriod,
+      bollPeriod: bollPeriod ?? this.bollPeriod,
+    );
+  }
+}
+
+/// K 线数据 Provider
+class ChartProvider extends ChangeNotifier {
+
+  // 当前币种
+  String _symbol = 'BTC';
+  String get symbol => _symbol;
+
+  // 时间周期
+  ChartInterval _interval = ChartInterval.hour1;
+  ChartInterval get interval => _interval;
+
+  // 技术指标
+  IndicatorSettings _indicators = const IndicatorSettings();
+  IndicatorSettings get indicators => _indicators;
+
+  // K 线数据
+  List<Candle> _candles = [];
+  List<Candle> get candles => _candles;
+
+  List<CandleData> get candleData => _candles
+      .map((c) => CandleData(
+            timestamp: c.timestamp,
+            open: c.open,
+            high: c.high,
+            low: c.low,
+            close: c.close,
+            volume: c.volume,
+          ))
+      .toList();
+
+  // 状态
+  bool _loading = false;
+  bool get loading => _loading;
+
+  String? _error;
+  String? get error => _error;
+
+  /// 切换币种
+  void setSymbol(String symbol) {
+    if (_symbol != symbol) {
+      _symbol = symbol;
+      loadCandles();
+    }
+  }
+
+  /// 切换时间周期
+  void setInterval(ChartInterval interval) {
+    if (_interval != interval) {
+      _interval = interval;
+      loadCandles();
+    }
+  }
+
+  /// 更新指标设置
+  void updateIndicators(IndicatorSettings settings) {
+    _indicators = settings;
+    notifyListeners();
+  }
+
+  /// 加载 K 线数据
+  Future<void> loadCandles() async {
+    _loading = true;
+    _error = null;
+    notifyListeners();
+
+    try {
+      // TODO: 对接真实 API
+      // final response = await _api.getKlineData(
+      //   symbol: _symbol,
+      //   interval: _interval.value,
+      // );
+
+      // 临时使用模拟数据
+      await Future.delayed(const Duration(milliseconds: 500));
+      _candles = _generateMockCandles();
+
+      _loading = false;
+      notifyListeners();
+    } catch (e) {
+      _loading = false;
+      _error = e.toString();
+      notifyListeners();
+    }
+  }
+
+  /// 生成模拟 K 线数据
+  List<Candle> _generateMockCandles() {
+    final now = DateTime.now();
+    final basePrice = _getBasePrice(_symbol);
+    final candles = <Candle>[];
+
+    for (int i = 100; i >= 0; i--) {
+      final time = now.subtract(Duration(
+        minutes: _interval == ChartInterval.min1
+            ? i
+            : _interval == ChartInterval.min5
+                ? i * 5
+                : _interval == ChartInterval.min15
+                    ? i * 15
+                    : _interval == ChartInterval.hour1
+                        ? i * 60
+                        : _interval == ChartInterval.hour4
+                            ? i * 240
+                            : i * 1440,
+      ));
+
+      final random = (i * 17) % 100 / 100;
+      final change = basePrice * 0.02 * (random - 0.5);
+      final open = basePrice + change;
+      final close = open + basePrice * 0.01 * ((i * 13) % 100 / 100 - 0.5);
+      final high = open > close ? open * 1.005 : close * 1.005;
+      final low = open < close ? open * 0.995 : close * 0.995;
+      final volume = 1000 + (i * 37) % 5000;
+
+      candles.add(Candle(
+        timestamp: time.millisecondsSinceEpoch,
+        open: open,
+        high: high,
+        low: low,
+        close: close,
+        volume: volume.toDouble(),
+      ));
+    }
+
+    return candles;
+  }
+
+  double _getBasePrice(String symbol) {
+    switch (symbol.toUpperCase()) {
+      case 'BTC':
+        return 42000.0;
+      case 'ETH':
+        return 2200.0;
+      case 'BNB':
+        return 300.0;
+      case 'SOL':
+        return 100.0;
+      case 'XRP':
+        return 0.5;
+      case 'DOGE':
+        return 0.08;
+      default:
+        return 100.0;
+    }
+  }
+}