From 98700f28bb208f7bdc741397b1c9993bfd051d8d Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Wed, 27 Nov 2013 00:48:37 +0400
Subject: Refresh only current page, fixes issue #18

---
 Juick/MainPage.xaml              |  8 ++++++++
 Juick/MainPage.xaml.cs           | 12 +++++-------
 Juick/ViewModels/AppViewModel.cs | 14 ++++++++++++--
 3 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/Juick/MainPage.xaml b/Juick/MainPage.xaml
index d2c99df..840f8ae 100644
--- a/Juick/MainPage.xaml
+++ b/Juick/MainPage.xaml
@@ -1,10 +1,12 @@
 <phone:PhoneApplicationPage
     x:Class="Juick.MainPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:bindings="clr-namespace:Juick.Classes" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
     xmlns:phoneshell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
     xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls"
+    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:usercontrols="clr-namespace:Juick.Controls" xmlns:classes="clr-namespace:Juick.Classes"
@@ -29,6 +31,12 @@
         </Grid.RowDefinitions>
         <TextBlock Text="Network unavailable" Visibility="{Binding NetworkUnavailable, Converter={StaticResource BooleanToVisibilityConverter}}" />
         <controls:Pivot x:Name="Pages" Title="juick" Grid.Row="2" ItemsSource="{Binding Pages}">
+            <i:Interaction.Triggers>
+                <i:EventTrigger EventName="SelectionChanged">
+                    <bindings:InvokeDelegateCommandAction Command="{Binding CheckNewDataCommand}"
+                                                          CommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=InvokeParameter}"/>
+                </i:EventTrigger>
+            </i:Interaction.Triggers>
           <controls:Pivot.HeaderTemplate>
             <DataTemplate>
               <TextBlock Text="{Binding Caption}"></TextBlock>
diff --git a/Juick/MainPage.xaml.cs b/Juick/MainPage.xaml.cs
index 7baa6dd..edf2d3b 100644
--- a/Juick/MainPage.xaml.cs
+++ b/Juick/MainPage.xaml.cs
@@ -45,8 +45,9 @@ namespace Juick
                               BindingOperations.SetBinding(
                                   progressIndicator, ProgressIndicator.IsIndeterminateProperty, binding);
                               if (App.AppContext.Account.IsAuthenticated)
-                                  foreach (var page in ((AppViewModel)DataContext).Pages)
-                                      page.RefreshData();
+                              {
+                                  App.AppContext.Pages[0].RefreshData();
+                              }
                           };
         }
 
@@ -86,11 +87,8 @@ namespace Juick
 
         private void ApplicationBarIconButtonClick(object sender, EventArgs e)
         {
-            foreach (var page in App.AppContext.Pages)
-            {
-                page.Items.Clear();
-                page.RefreshData();
-            }
+            App.AppContext.Pages[Pages.SelectedIndex].Items.Clear();
+            App.AppContext.Pages[Pages.SelectedIndex].RefreshData();
         }
 
         private void ApplicationBarMenuItemClick(object sender, EventArgs e)
diff --git a/Juick/ViewModels/AppViewModel.cs b/Juick/ViewModels/AppViewModel.cs
index 2aff819..ba33625 100644
--- a/Juick/ViewModels/AppViewModel.cs
+++ b/Juick/ViewModels/AppViewModel.cs
@@ -10,6 +10,7 @@ using RestSharp;
 using Microsoft.Phone.Notification;
 using System.Diagnostics;
 using System.Text;
+using System.Windows.Controls;
 
 namespace Juick.ViewModels
 {
@@ -98,7 +99,8 @@ namespace Juick.ViewModels
                     }
                     Debug.WriteLine("Received: " + message.ToString());
                 };                
-            }            
+            }
+            CheckNewDataCommand = new DelegateCommand<SelectionChangedEventArgs>(CheckNewData, () => Account.IsAuthenticated);
         }
         private ObservableCollection<PageViewModel> _pages;
         public ObservableCollection<PageViewModel> Pages
@@ -133,6 +135,8 @@ namespace Juick.ViewModels
             }
         }
 
+        public DelegateCommand<SelectionChangedEventArgs> CheckNewDataCommand { get; private set; }
+
         private AccountManager _acc;
 
         public AccountManager Account
@@ -172,6 +176,12 @@ namespace Juick.ViewModels
             if (pushChannel.IsShellToastBound)
                 pushChannel.UnbindToShellToast();
             Account.NotificationUri = string.Empty;            
-        }        
+        }
+
+        public void CheckNewData(SelectionChangedEventArgs param)
+        {
+            var page = param.AddedItems[0] as PageViewModel;
+            page.RefreshData();
+        }
     }
 }
-- 
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