/V4/StockTrader RI/Desktop/StockTraderRI.Modules.Market/TrendLine/TrendLineViewModel.cs

//===================================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation and Silverlight

//===================================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===================================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===================================================================================

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ComponentModel.Composition;

using Microsoft.Practices.Prism.ViewModel;

using StockTraderRI.Infrastructure.Interfaces;

using Microsoft.Practices.Prism.Events;

using StockTraderRI.Infrastructure.Models;

using StockTraderRI.Infrastructure;



namespace StockTraderRI.Modules.Market.TrendLine

{

    [Export(typeof(TrendLineViewModel))]

    public class TrendLineViewModel : NotificationObject

    {

        private readonly IMarketHistoryService marketHistoryService;



        private string tickerSymbol;



        private MarketHistoryCollection historyCollection;



        [ImportingConstructor]

        public TrendLineViewModel(IMarketHistoryService marketHistoryService, IEventAggregator eventAggregator)

        {

            if (eventAggregator == null)

            {

                throw new ArgumentNullException("eventAggregator");

            }



            this.marketHistoryService = marketHistoryService;

            eventAggregator.GetEvent<TickerSymbolSelectedEvent>().Subscribe(this.TickerSymbolChanged);

        }



        public void TickerSymbolChanged(string newTickerSymbol)

        {

            MarketHistoryCollection newHistoryCollection = this.marketHistoryService.GetPriceHistory(newTickerSymbol);



            this.TickerSymbol = newTickerSymbol;

            this.HistoryCollection = newHistoryCollection;

        }



        public string TickerSymbol

        {

            get

            {

                return this.tickerSymbol;

            }

            set

            {

                if (this.tickerSymbol != value)

                {

                    this.tickerSymbol = value;

                    this.RaisePropertyChanged(() => this.TickerSymbol);                    

                }

            }

        }



        public MarketHistoryCollection HistoryCollection

        {

            get

            {

                return historyCollection;

            }

            private set

            {

                if (this.historyCollection != value)

                {

                    this.historyCollection = value;

                    this.RaisePropertyChanged(() => this.HistoryCollection);

                }

            }

        }

    }

}