364 lines
13 KiB
C#
364 lines
13 KiB
C#
using System.Windows.Media;
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using AutoMapper;
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using CommunityToolkit.Mvvm.ComponentModel;
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using CommunityToolkit.Mvvm.Input;
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using DMS.Application.DTOs;
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using DMS.Application.Events;
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using DMS.Application.Interfaces;
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using DMS.Application.Interfaces.Database;
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using DMS.Core.Enums;
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using DMS.Core.Events;
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using DMS.Core.Models;
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using DMS.WPF.Interfaces;
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using DMS.WPF.ItemViewModel;
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using LiveChartsCore;
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using LiveChartsCore.Defaults;
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using LiveChartsCore.SkiaSharpView;
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using LiveChartsCore.SkiaSharpView.Painting;
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using LiveChartsCore.SkiaSharpView.WPF;
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using ObservableCollections;
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using SkiaSharp;
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namespace DMS.WPF.ViewModels;
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partial class VariableHistoryViewModel : ViewModelBase, INavigatable
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{
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private readonly IMapper _mapper;
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private readonly IDialogService _dialogService;
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private readonly IHistoryAppService _historyAppService;
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private readonly IViewCenterService _wpfDataService;
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private readonly IViewDataService _viewDataService;
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private readonly IEventService _eventService;
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private readonly INotificationService _notificationService;
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private readonly INavigationService _navigationService;
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/// <summary>
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/// 加载历史记录条数限制
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/// </summary>
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[ObservableProperty]
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private int? _initHistoryLimit;
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/// <summary>
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/// 显示历史记录条数限制
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/// </summary>
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[ObservableProperty]
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private int? _viewHistoryLimit;
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/// <summary>
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/// 历史记录开始时间
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/// </summary>
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[ObservableProperty]
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private DateTime? _startTime;
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/// <summary>
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/// 历史记录结束时间
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/// </summary>
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[ObservableProperty]
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private DateTime? _endTime;
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/// <summary>
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/// 选中的变量历史记录
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/// </summary>
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[ObservableProperty]
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private VariableItem _currentVariable;
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/// <summary>
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/// 变量历史记录列表
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/// </summary>
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public NotifyCollectionChangedSynchronizedViewList<VariableHistoryDto> VariableHistories { get; }
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// 折线图相关属性
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public ISeries[] LineSeriesCollection { get; set; }
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[ObservableProperty]
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private Axis[] _lineAxisX;
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[ObservableProperty]
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private Axis[] _lineAxisY;
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private readonly ObservableList<VariableHistoryDto> _variableHistoryList;
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private readonly ISynchronizedView<VariableHistoryDto, VariableHistoryDto> _variableHistorySynchronizedView;
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/// <summary>
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/// 所有变量的缓存列表，用于搜索
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/// </summary>
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private List<VariableHistoryDto> _allVariableHistories;
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public VariableHistoryViewModel(IMapper mapper, IDialogService dialogService, IHistoryAppService historyAppService,
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IViewCenterService wpfDataService, IViewDataService dataStorageService,
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IEventService eventService, INotificationService notificationService,
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INavigationService navigationService)
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{
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_mapper = mapper;
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_dialogService = dialogService;
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_historyAppService = historyAppService;
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_wpfDataService = wpfDataService;
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_viewDataService = dataStorageService;
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_eventService = eventService;
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_notificationService = notificationService;
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_navigationService = navigationService;
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_variableHistoryList = new ObservableList<VariableHistoryDto>();
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_variableHistorySynchronizedView = _variableHistoryList.CreateView(v => v);
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VariableHistories = _variableHistorySynchronizedView.ToNotifyCollectionChanged();
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_allVariableHistories = new List<VariableHistoryDto>();
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// 初始化默认值
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_initHistoryLimit = 50; // 默认限制1000条记录
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_startTime = null;
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_endTime = null;
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// 初始化图表属性
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LineAxisX = new Axis[] { new Axis() };
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LineAxisY = new Axis[] { new Axis() };
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LineSeriesCollection = new ISeries[0];
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_eventService.OnVariableValueChanged += OnVariableValueChanged;
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}
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private void OnVariableValueChanged(object? sender, VariableValueChangedEventArgs e)
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{
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if (CurrentVariable is null)
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{
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return;
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}
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if (e.Variable.Id != CurrentVariable.Id)
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{
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return;
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}
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var variableHistory = new VariableHistoryDto()
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{
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VariableId = CurrentVariable.Id,
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Timestamp = DateTime.Now,
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Value = e.Variable.DisplayValue,
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NumericValue = e.Variable.NumericValue
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};
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_variableHistoryList.Add(variableHistory);
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// 限制历史记录数量以防止内存溢出
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if (ViewHistoryLimit.HasValue && _variableHistoryList.Count > ViewHistoryLimit.Value)
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{
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// 移除最旧的记录
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_variableHistoryList.RemoveAt(0);
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}
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// 更新图表数据 - 使用更高效的方法处理实时更新
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UpdateChartData();
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}
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/// <summary>
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/// 加载所有变量的历史记录
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/// </summary>
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/// <param name="limit">返回记录的最大数量，null表示无限制</param>
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/// <param name="startTime">开始时间，null表示无限制</param>
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/// <param name="endTime">结束时间，null表示无限制</param>
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private async void LoadAllVariableHistories(int variableId, int? limit = null, DateTime? startTime = null,
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DateTime? endTime = null)
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{
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try
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{
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_variableHistoryList.Clear();
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var allHistories
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= await _historyAppService.GetVariableHistoriesAsync(variableId, limit, startTime, endTime);
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_allVariableHistories = allHistories.OrderBy(v => v.Timestamp)
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.ToList();
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_variableHistoryList.AddRange(_allVariableHistories);
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// 更新图表数据
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UpdateChartData();
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}
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catch (Exception ex)
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{
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// 记录更详细的错误信息
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_notificationService.ShowError($"加载变量历史记录失败: {ex.Message}", ex);
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}
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}
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public override async Task OnNavigatedToAsync(NavigationParameter parameter)
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{
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if (_viewDataService.Variables.TryGetValue(parameter.TargetId, out VariableItem variableItem))
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{
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CurrentVariable = variableItem;
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// 加载所有变量的历史记录
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LoadAllVariableHistories(variableItem.Id, InitHistoryLimit, StartTime, EndTime);
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}
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}
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/// <summary>
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/// 重新加载历史记录命令
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/// </summary>
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[RelayCommand]
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private void Reload()
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{
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if (CurrentVariable != null)
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{
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LoadAllVariableHistories(CurrentVariable.Id, InitHistoryLimit, StartTime, EndTime);
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}
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}
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/// <summary>
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/// 返回变量表命令
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/// </summary>
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[RelayCommand]
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private async Task NavigateToVariableTable()
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{
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try
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{
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// 导航到变量表页面
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await _navigationService.NavigateToAsync(this,new NavigationParameter(nameof(VariableTableViewModel),CurrentVariable.VariableTableId,NavigationType.VariableTable));
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}
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catch (Exception ex)
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{
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_notificationService.ShowError($"导航到变量表失败: {ex.Message}", ex);
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}
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}
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/// <summary>
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/// 根据搜索文本过滤历史记录
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/// </summary>
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/// <param name="searchText"></param>
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private void FilterHistoriesBySearchText(string searchText)
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{
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if (string.IsNullOrWhiteSpace(searchText))
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{
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// 如果搜索文本为空，显示所有历史记录
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_variableHistoryList.Clear();
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_variableHistoryList.AddRange(_allVariableHistories);
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}
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else
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{
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// 根据搜索文本过滤历史记录
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var filteredHistories = _allVariableHistories
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.Where(h =>
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h.VariableName?.Contains(
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searchText, StringComparison.OrdinalIgnoreCase) == true)
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.ToList();
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_variableHistoryList.Clear();
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_variableHistoryList.AddRange(filteredHistories);
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}
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}
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/// <summary>
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/// 根据变量ID加载历史记录
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/// </summary>
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/// <param name="variableId">变量ID</param>
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/// <param name="limit">返回记录的最大数量，null表示无限制</param>
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/// <param name="startTime">开始时间，null表示无限制</param>
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/// <param name="endTime">结束时间，null表示无限制</param>
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public async Task LoadVariableHistoriesAsync(int variableId, int? limit = null, DateTime? startTime = null,
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DateTime? endTime = null)
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{
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try
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{
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_variableHistoryList.Clear();
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var histories = await _historyAppService.GetVariableHistoriesAsync(variableId, limit, startTime, endTime);
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_variableHistoryList.AddRange(histories);
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// 更新图表数据
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UpdateChartData();
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}
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catch (Exception ex)
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{
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// 记录更详细的错误信息
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_notificationService.ShowError($"加载变量历史记录失败: {ex.Message}", ex);
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}
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}
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// 添加字段来保存轴实例，以保持缩放状态
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private Axis[] _lineAxisXInstance;
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private Axis[] _lineAxisYInstance;
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/// <summary>
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/// 更新图表数据
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/// </summary>
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private void UpdateChartData()
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{
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if (_variableHistoryList == null || _variableHistoryList.Count == 0)
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{
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// 清空图表数据
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LineSeriesCollection = new ISeries[0];
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OnPropertyChanged(nameof(LineSeriesCollection));
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return;
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}
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// 如果系列集合为空或没有有效的系列，则重新创建
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if (LineSeriesCollection == null || LineSeriesCollection.Length == 0)
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{
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// 创建数值点集合
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var values = new List<DateTimePoint>();
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foreach (var history in _variableHistoryList)
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{
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values.Add(new DateTimePoint(history.Timestamp, history.NumericValue));
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}
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// 创建线性序列
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var series = new LineSeries<DateTimePoint>
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{
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Name = CurrentVariable?.Name ?? "变量值",
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Values = values,
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Fill = null,
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Stroke = new SolidColorPaint(new SKColor(41, 128, 185)) { StrokeThickness = 2 },
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GeometrySize = 6, // 显示数据点，圆点大小为6
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LineSmoothness = 5 // 使用直线连接点，也可以设为其他值实现曲线
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};
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// 更新序列集合
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LineSeriesCollection = new ISeries[] { series };
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// 初始化坐标轴并保存实例引用
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_lineAxisXInstance = new Axis[]
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{
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new Axis
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{
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Labeler = value => new DateTime((long)value).ToString("MM-dd HH:mm:ss"),
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// 不设置固定范围，让图表根据数据自动调整
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}
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};
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_lineAxisYInstance = new Axis[]
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{
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new Axis
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{
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Name = CurrentVariable?.Name ?? "值",
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MinLimit = 0 // 设置Y轴从0开始
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}
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};
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// 设置属性值
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LineAxisX = _lineAxisXInstance;
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LineAxisY = _lineAxisYInstance;
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// 通知属性更改
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OnPropertyChanged(nameof(LineSeriesCollection));
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OnPropertyChanged(nameof(LineAxisX));
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OnPropertyChanged(nameof(LineAxisY));
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}
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else
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{
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// 对于实时更新，保持原有完整的更新逻辑以确保数据一致性
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// 创建数值点集合
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var values = new List<DateTimePoint>();
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foreach (var history in _variableHistoryList)
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{
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// 尝试将值转换为double
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values.Add(new DateTimePoint(history.Timestamp, history.NumericValue));
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}
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// 更新当前系列
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var currentSeries = (LineSeries<DateTimePoint>)LineSeriesCollection[0];
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currentSeries.Values = values;
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currentSeries.Name = CurrentVariable?.Name ?? "变量值";
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// 通知系列更改，但保留当前轴的缩放状态（不需要更新轴）
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// OnPropertyChanged(nameof(LineSeriesCollection));
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}
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}
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} |