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annotate MetroWpf/Stocks.UI/ViewModels/StocksViewModel.cs @ 23:399398841fd0

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Working version for Stocks (including loosely coupled components
author adminsh@apollo
date Tue, 20 Mar 2012 16:53:29 +0000
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children 4b8b38d17d24
rev   line source
23
399398841fd0 Working version for Stocks (including loosely coupled components
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1 using System;
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2 using System.ComponentModel;
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3 using System.Linq;
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4 using System.Reactive;
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5 using System.Reactive.Linq;
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6 using System.Windows.Input;
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7 using GalaSoft.MvvmLight;
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8 using GalaSoft.MvvmLight.Command;
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9 using Stocks.Common;
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10 using Stocks.Common.Events;
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11 using Stocks.UI.Models;
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12
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13 namespace Stocks.UI.ViewModels
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14 {
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15 public class StocksViewModel : ViewModelBase
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16 {
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17 private readonly IStocksService _service;
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19 public BindingList<DisplayStockPrice> DisplayStockPrices { get; set; }
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20 public ICommand ServiceCommand { get; set; }
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21 public ICommand SubscriptionCommand { get; set; }
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22
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23 public StocksViewModel(IStocksService service)
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24 {
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25 _service = service;
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26 GetLatestPrices();
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27
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28 SubscriptionCommand = new RelayCommand(SubscriptionCommandExecute);
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29 ServiceCommand = new RelayCommand(ServiceRunningCommandExecute);
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30
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31 var priceUpdates = Observable.FromEventPattern<PriceChangedEventArgs>(
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32 _service,
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33 "PriceChanged");
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34
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35 priceUpdates.Where(e => Subscribed)
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36 //.Throttle(TimeSpan.FromSeconds(1))
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37 .Subscribe(PriceChanged);
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38 }
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39
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40 public void PriceChanged(EventPattern<PriceChangedEventArgs> e)
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41 {
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42 var displayRate = DisplayStockPrices.First(
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43 rate => rate.Symbol == e.EventArgs.Price.Symbol);
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44
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45 if (displayRate != null)
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46 displayRate.Update(e.EventArgs.Price);
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47 }
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48
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49
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50 private void GetLatestPrices()
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51 {
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52 DisplayStockPrices = new BindingList<DisplayStockPrice>();
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53 var currentRates = _service.GetFullCurrentPrices();
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54 foreach (var latestRate in currentRates)
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55 {
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56 var displayRate = DisplayStockPrice.Create(latestRate);
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57 DisplayStockPrices.Add(displayRate);
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58 }
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59 }
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60
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61 private const string SubscribedPropertyName = "Subscribed";
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62 private bool _subscribed = false;
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63
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64 public bool Subscribed
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65 {
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66 get { return _subscribed; }
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67 set
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68 {
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69 if (_subscribed == value) return;
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70 _subscribed = value;
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71 RaisePropertyChanged(SubscribedPropertyName);
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72 }
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73 }
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74
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75 private const string ServiceRunningPropertyName = "ServiceRunning";
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76 private bool _serviceRunning;
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77
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78 public bool ServiceRunning
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79 {
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80 get { return _serviceRunning; }
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81 set
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82 {
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83 if (_serviceRunning == value) return;
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84 _serviceRunning = value;
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85 RaisePropertyChanged(ServiceRunningPropertyName);
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86 }
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87 }
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88
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89 private void ServiceRunningCommandExecute()
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90 {
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91 if (_service.IsRunning)
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92 {
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93 _service.Stop();
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94 ServiceRunning = false;
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95 }
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96 else
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97 {
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98 _service.Start();
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99 ServiceRunning = true;
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100 }
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101 }
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102
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103 private void SubscriptionCommandExecute()
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104 {
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105 //toggle subscribed
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106 Subscribed = !Subscribed;
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107 }
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108 }
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109 }