Mercurial > silverbladetech
annotate MetroWpf/Stocks.UI/ViewModels/StocksViewModel.cs @ 90:d523381be45a
nuge restore added
author | stevenhollidge <stevenhollidge@hotmail.com> |
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date | Mon, 30 Apr 2012 10:48:49 +0100 |
parents | 4b8b38d17d24 |
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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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18 |
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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"; |
39 | 62 private bool _subscribed; |
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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 } |