Mercurial > silverbladetech

annotate MetroWpf/FxRates.UI/ViewModels/FxRatesViewModel.cs @ 59:3591c26bd63e

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MVVMLight added
author Steven Hollidge <stevenhollidge@hotmail.com>
date Sat, 21 Apr 2012 19:20:28 +0100
parents a8b50a087544
children
rev   line source
24
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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 FxRates.Common;
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8 using FxRates.UI.Models;
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9 using GalaSoft.MvvmLight;
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10 using GalaSoft.MvvmLight.Command;
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11
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12 namespace FxRates.UI.ViewModels
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13 {
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14 public class FxRatesViewModel : ViewModelBase
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15 {
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16 private IPricingService pricingService;
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17
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18 public BindingList<DisplayFxRate> DisplayFxRates { get; set; }
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19 public ICommand ServiceRunningCommand { get; set; }
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20 public ICommand SubscriptionCommand { get; set; }
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21
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22 public FxRatesViewModel(IPricingService service)
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23 {
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24 pricingService = service;
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25 GetLatestPrices();
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26
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27 SubscriptionCommand = new RelayCommand(SubscriptionCommand_Execute);
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28 ServiceRunningCommand = new RelayCommand(ServiceRunningCommand_Execute);
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29
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30 var priceUpdates = Observable.FromEventPattern<PriceUpdateEventArgs>(
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31 pricingService, "PriceUpdate");
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32
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33 priceUpdates.Where(e => (Subscribed)
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34 // && (e.EventArgs.LatestPrice.Ccy == Ccy.EURtoGBP) example of filter
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35 )
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36 //.Throttle(TimeSpan.FromSeconds(1)) example of throttling
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37 .Subscribe(PriceUpdate);
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38 }
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39
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40 public void PriceUpdate(EventPattern<PriceUpdateEventArgs> e)
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41 {
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42 var displayRate = DisplayFxRates.First(rate => rate.Ccy == e.EventArgs.LatestPrice.Ccy);
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43
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44 if (displayRate != null)
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45 displayRate.Update(e.EventArgs.LatestPrice);
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46 }
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47
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48
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49 private void GetLatestPrices()
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50 {
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51 DisplayFxRates = new BindingList<DisplayFxRate>();
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52 var currentRates = pricingService.GetFullCurrentPrices();
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53 foreach (var latestRate in currentRates)
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54 {
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55 var displayRate = DisplayFxRate.Create(latestRate);
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56 DisplayFxRates.Add(displayRate);
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57 }
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58 }
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59
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60 private const string SubscribedPropertyName = "Subscribed";
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61 private bool _subscribed = false;
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62 public bool Subscribed
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63 {
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64 get { return _subscribed; }
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65 set
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66 {
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67 if (_subscribed == value) return;
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68 _subscribed = value;
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69 RaisePropertyChanged(SubscribedPropertyName);
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70 }
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71 }
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72
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73 private const string ServiceRunningPropertyName = "ServiceRunning";
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74 private bool _serviceRunning;
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75 public bool ServiceRunning
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76 {
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77 get
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78 {
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79 return _serviceRunning;
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80 }
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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 void ServiceRunningCommand_Execute()
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90 {
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91 if (pricingService.IsRunning)
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92 {
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93 pricingService.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 pricingService.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 void SubscriptionCommand_Execute()
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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 }