Line data    Source code

       1             : // Copyright 2023 The terCAD team. All rights reserved.
       2             : // Use of this source code is governed by a CC BY-NC-ND 4.0 license that can be found in the LICENSE file.
       3             : 
       4             : import 'package:app_finance/_classes/herald/app_locale.dart';
       5             : import 'package:app_finance/_ext/build_context_ext.dart';
       6             : import 'package:app_finance/charts/interface/ohlc_data.dart';
       7             : import 'package:app_finance/charts/painter/foreground_chart_painter.dart';
       8             : import 'package:app_finance/charts/painter/ohlc_chart_painter.dart';
       9             : import 'package:app_finance/design/generic/empty_widget.dart';
      10             : import 'package:flutter/material.dart';
      11             : import 'package:intl/intl.dart';
      12             : 
      13             : class OhlcChart extends StatelessWidget {
      14             :   final double width;
      15             :   final double height;
      16             :   final double indent;
      17             :   final DateTime xMin;
      18             :   final String tooltip;
      19             :   final List<OhlcData> data;
      20             : 
      21           0 :   const OhlcChart({
      22             :     super.key,
      23             :     required this.data,
      24             :     required this.width,
      25             :     required this.height,
      26             :     required this.xMin,
      27             :     this.indent = 0.0,
      28             :     this.tooltip = '',
      29             :   });
      30             : 
      31           0 :   @override
      32             :   Widget build(BuildContext context) {
      33             :     double yMin = 0.0;
      34             :     double yMax = 0.0;
      35           0 :     for (int i = 0; i < data.length; i++) {
      36           0 :       if (data[i].low < yMin) yMin = data[i].low;
      37           0 :       if (data[i].high > yMax) yMax = data[i].high;
      38             :     }
      39           0 :     if (data.isEmpty || yMax == 0.0) {
      40             :       return const EmptyWidget();
      41             :     }
      42           0 :     yMax *= 1.25;
      43           0 :     final now = DateTime.now();
      44           0 :     final size = Size(width, height);
      45           0 :     final bgColor = context.colorScheme.onSurface;
      46           0 :     final xMax = DateTime(now.year, now.month + 1);
      47           0 :     final bg = ForegroundChartPainter(
      48             :       size: size,
      49             :       color: bgColor,
      50             :       lineColor: bgColor,
      51           0 :       background: bgColor.withOpacity(0.1),
      52             :       yMin: yMin,
      53             :       yMax: yMax,
      54           0 :       yTpl: NumberFormat.compact(locale: AppLocale.code),
      55             :       xType: DateTime,
      56           0 :       xMin: xMin.millisecondsSinceEpoch.toDouble(),
      57           0 :       xMax: xMax.millisecondsSinceEpoch.toDouble(),
      58             :       xDivider: 6,
      59           0 :       xTpl: DateFormat.Md(AppLocale.code),
      60             :     );
      61           0 :     return SizedBox(
      62           0 :       height: size.height,
      63           0 :       width: size.width,
      64           0 :       child: CustomPaint(
      65             :         size: size,
      66           0 :         painter: OhlcChartPainter(
      67           0 :           indent: bg.shift,
      68             :           color: bgColor,
      69             :           size: size,
      70           0 :           data: data,
      71             :           yMax: yMax,
      72           0 :           xMin: xMin.millisecondsSinceEpoch.toDouble(),
      73           0 :           xMax: xMax.millisecondsSinceEpoch.toDouble(),
      74             :         ),
      75             :         foregroundPainter: bg,
      76             :         willChange: false,
      77           0 :         child: Padding(
      78           0 :           padding: EdgeInsets.only(top: indent / 4),
      79           0 :           child: Text(tooltip),
      80             :         ),
      81             :       ),
      82             :     );
      83             :   }
      84             : }