Juick/ViewModels/MessageListViewModelBase.cs


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using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.Serialization.Json;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using Juick.Api;
using RestSharp;

namespace Juick.ViewModels
{
    public class MessageListViewModelBase : INotifyPropertyChanged
    {
        public MessageListViewModelBase()
        {
            this.Items = new ObservableCollection<MessageViewModel>();
        }

        public string RestUri { get; set; }
        
        /// <summary>
        /// A collection for MessageViewModel objects.
        /// </summary>
        public ObservableCollection<MessageViewModel> Items { get; private set; }
        
        public bool IsDataLoaded
        {
            get;
            private set;
        }

        /// <summary>
        /// Creates and adds a few MessageViewModel objects into the Items collection.
        /// </summary>
        public void LoadData()
        {
            if (string.IsNullOrEmpty(RestUri))
            {
                RestUri = "/home?1=1";
            }
            var request = new RestRequest(RestUri +"&rnd=" + Environment.TickCount);
            App.Client.Authenticator = new HttpBasicAuthenticator(App.Account.Credentials.UserName, App.Account.Credentials.Password);
            App.Client.ExecuteAsync<List<Message>>(request, response => 
                                                 {
                                                     if (response.StatusCode != HttpStatusCode.OK)
                                                     {
                                                         MessageBox.Show(response.StatusCode.ToString());
                                                         return;
                                                     }

                                                     var messages = response.Data;
                                                     Items.Clear();
                                                     messages.ForEach(post =>
                                                                          {
                                                                              var item = new MessageViewModel(post)
                                                                                             {
                                                                                                 Status =
                                                                                                     string.Format(
                                                                                                         "Posted on: {0}, replies: {1}",
                                                                                                         post.Timestamp,
                                                                                                         post.Replies)
                                                                                             };
                                                                              Items.Add(item);
                                                                              var imageUri = new Uri(string.Format("http://i.juick.com/as/{0}.png", post.User.Uid), UriKind.Absolute);
                                                                              item.UserAvatar = new BitmapImage
                                                                                                    {
                                                                                                        UriSource = imageUri
                                                                                                    };
                                                                              if (post.Photo != null)
                                                                              {
                                                                                  item.Attachment = new BitmapImage { UriSource = new Uri(post.Photo.Small, UriKind.Absolute) };
                                                                              }
                                                                              
                                                                          });
                                                         NotifyPropertyChanged("Items");
                                                 });
        }

       
        public event PropertyChangedEventHandler PropertyChanged;
        public void NotifyPropertyChanged(String propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (null != handler)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}