From 3be6eccab55ca90a060cb56882c5675a7ad875ce Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Fri, 29 Mar 2013 13:21:34 +0400
Subject: there is no need to implement INotifyPropertyChanged on post item

---
 Juick/ViewModels/ViewModelBase.cs | 118 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 Juick/ViewModels/ViewModelBase.cs

(limited to 'Juick/ViewModels/ViewModelBase.cs')

diff --git a/Juick/ViewModels/ViewModelBase.cs b/Juick/ViewModels/ViewModelBase.cs
new file mode 100644
index 0000000..e86ff4a
--- /dev/null
+++ b/Juick/ViewModels/ViewModelBase.cs
@@ -0,0 +1,118 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Net;
+using System.Windows;
+using System.Windows.Media.Imaging;
+using Juick.Classes;
+using JuickApi;
+using RestSharp;
+
+namespace Juick.ViewModels
+{
+    public class ViewModelBase : INotifyPropertyChanged
+    {
+        static readonly string IsDataLoadingPropertyName = ExpressionHelper.GetPropertyName<ViewModelBase>(x => x.IsDataLoading);
+        bool isDataLoading;
+
+        public ViewModelBase()
+        {
+            Items = new ObservableCollection<PostItem>();
+            LoadMessagesPageCommand = new DelegateCommand(LoadData, () => !IsDataLoading);
+        }
+
+        public string RestUri { get; set; }
+        public virtual string Caption { get { return "juick"; } }
+
+        /// <summary>
+        /// A collection for MessageViewModel objects.
+        /// </summary>
+        public ObservableCollection<PostItem> Items { get; private set; }
+
+        public DelegateCommand LoadMessagesPageCommand { get; private set; }
+
+        public bool IsDataLoading
+        {
+            get { return isDataLoading; }
+            set
+            {
+                isDataLoading = value;
+                NotifyPropertyChanged(IsDataLoadingPropertyName);
+                LoadMessagesPageCommand.NotifyCanExecuteChanged();
+            }
+        }
+
+        /// <summary>
+        /// Creates and adds a few MessageViewModel objects into the Items collection.
+        /// </summary>
+        public void LoadData()
+        {
+            if (IsDataLoading) {
+                return;
+            }
+
+            const int PageSize = 1;
+
+            if (string.IsNullOrEmpty(RestUri))
+            {
+                RestUri = "/home?1=1";
+            }
+
+            // super-костыли
+            // todo: rewrite
+            else if (RestUri.StartsWith("/home?", StringComparison.InvariantCulture) && Items.Count > 0)
+            {
+                var lastItem = Items[Items.Count - 1];
+                RestUri = string.Format("/home?before_mid={0}&page={1}", lastItem.MID, PageSize);
+            }
+            else if (RestUri.StartsWith("/messages?", StringComparison.InvariantCulture) && Items.Count > 0)
+            {
+                var lastItem = Items[Items.Count - 1];
+                RestUri = string.Format("/messages?before_mid={0}&page={1}", lastItem.MID, PageSize);
+            }
+
+            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, ProcessResponse);
+            IsDataLoading = true;
+        }
+
+        void ProcessResponse(IRestResponse<List<Message>> response)
+        {
+            IsDataLoading = false;
+            if (response.StatusCode != HttpStatusCode.OK)
+            {
+                MessageBox.Show(response.StatusCode.ToString());
+                return;
+            }
+
+            //Items.Clear();
+            foreach (var post in response.Data)
+            {
+                var status = string.Format("Posted on: {0}, replies: {1}", post.Timestamp, post.Replies);
+                var item = new PostItem(post)
+                               {
+                                   Status = status,
+                                   AvatarUri = new Uri(string.Format("http://i.juick.com/as/{0}.png", post.User.Uid), UriKind.Absolute)
+                               };
+                if (post.Photo != null)
+                {
+                    item.Attachment = new Uri(post.Photo.Small, UriKind.Absolute) ;
+                }
+                Items.Add(item);
+            }
+        }
+
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public void NotifyPropertyChanged(string propertyName)
+        {
+            if (PropertyChanged != null)
+            {
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+            }
+        }
+    }
+}
-- 
cgit v1.2.3