From acca89315ee8ae3a0c0b4514827eb2cb73808741 Mon Sep 17 00:00:00 2001
From: Konstantin
Date: Sat, 2 Feb 2013 15:47:01 +0400
Subject: add Caption to ViewModel

---
 Juick/Classes/ExpressionHelper.cs            | 20 ++++++++++++++++++++
 Juick/Juick.csproj                           |  1 +
 Juick/ThreadView.xaml                        |  2 +-
 Juick/ViewModels/MessageListViewModelBase.cs |  4 +++-
 Juick/ViewModels/ThreadViewModel.cs          |  9 ++++++++-
 5 files changed, 33 insertions(+), 3 deletions(-)
 create mode 100644 Juick/Classes/ExpressionHelper.cs

diff --git a/Juick/Classes/ExpressionHelper.cs b/Juick/Classes/ExpressionHelper.cs
new file mode 100644
index 0000000..3eb453a
--- /dev/null
+++ b/Juick/Classes/ExpressionHelper.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Linq.Expressions;
+
+namespace Juick.Classes
+{
+    static class ExpressionHelper
+    {
+        public static string GetPropertyName<T>(Expression<Func<T, object>> propertyExpression)
+        {
+            var bodyExpression = propertyExpression.Body;
+            var unaryExpression = bodyExpression as UnaryExpression;
+            if (unaryExpression != null)
+            {
+                bodyExpression = unaryExpression.Operand;
+            }
+            var memberExpression = (MemberExpression)bodyExpression;
+            return memberExpression.Member.Name;
+        }
+    }
+}
diff --git a/Juick/Juick.csproj b/Juick/Juick.csproj
index c330761..c74da5b 100644
--- a/Juick/Juick.csproj
+++ b/Juick/Juick.csproj
@@ -73,6 +73,7 @@
     <Compile Include="Classes\BindingChangedEventArgs.cs" />
     <Compile Include="Classes\DelegateCommand.cs" />
     <Compile Include="Classes\DependencyPropertyListener.cs" />
+    <Compile Include="Classes\ExpressionHelper.cs" />
     <Compile Include="Classes\ScrollViewerMonitor.cs" />
     <Compile Include="Controls\HyperLinkRichTextBox.cs" />
     <Compile Include="LoginView.xaml.cs">
diff --git a/Juick/ThreadView.xaml b/Juick/ThreadView.xaml
index 7de5533..ebfd166 100644
--- a/Juick/ThreadView.xaml
+++ b/Juick/ThreadView.xaml
@@ -23,7 +23,7 @@
 
         <!--TitlePanel contains the name of the application and page title-->
         <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
-            <TextBlock x:Name="ApplicationTitle" Text="JUICK" Style="{StaticResource PhoneTextNormalStyle}"/>
+            <TextBlock x:Name="ApplicationTitle" Text="{Binding Caption}" Style="{StaticResource PhoneTextNormalStyle}"/>
         </StackPanel>
 
         <!--ContentPanel - place additional content here-->
diff --git a/Juick/ViewModels/MessageListViewModelBase.cs b/Juick/ViewModels/MessageListViewModelBase.cs
index b9d7070..60c0a94 100644
--- a/Juick/ViewModels/MessageListViewModelBase.cs
+++ b/Juick/ViewModels/MessageListViewModelBase.cs
@@ -13,6 +13,7 @@ namespace Juick.ViewModels
 {
     public class MessageListViewModelBase : INotifyPropertyChanged
     {
+        static readonly string IsDataLoadingPropertyName = ExpressionHelper.GetPropertyName<MessageListViewModelBase>(x => x.IsDataLoading);
         bool isDataLoading;
 
         public MessageListViewModelBase()
@@ -22,6 +23,7 @@ namespace Juick.ViewModels
         }
 
         public string RestUri { get; set; }
+        public virtual string Caption { get { return "juick"; } }
 
         /// <summary>
         /// A collection for MessageViewModel objects.
@@ -36,7 +38,7 @@ namespace Juick.ViewModels
             set
             {
                 isDataLoading = value;
-                NotifyPropertyChanged("IsDataLoading");
+                NotifyPropertyChanged(IsDataLoadingPropertyName);
                 LoadMessagesPageCommand.NotifyCanExecuteChanged();
             }
         }
diff --git a/Juick/ViewModels/ThreadViewModel.cs b/Juick/ViewModels/ThreadViewModel.cs
index 4a80f31..ec1f92d 100644
--- a/Juick/ViewModels/ThreadViewModel.cs
+++ b/Juick/ViewModels/ThreadViewModel.cs
@@ -1,9 +1,11 @@
-using System;
+using Juick.Classes;
 
 namespace Juick.ViewModels
 {
     public class ThreadViewModel : MessageListViewModelBase
     {
+        static readonly string CaptionPropertyName = ExpressionHelper.GetPropertyName<ThreadViewModel>(x => x.Caption);
+
         private int _mid;
         public int Mid
         {
@@ -12,7 +14,12 @@ namespace Juick.ViewModels
             { 
                 _mid = value;
                 RestUri = string.Format("/thread?mid={0}", _mid);
+                NotifyPropertyChanged(CaptionPropertyName);
             }
         }
+
+        public override string Caption {
+            get { return "#" + _mid; }
+        }
     }
 }
-- 
cgit v1.2.3