Refresh TreeView CollectionViewSource ObservableCollection Item Changed - wpf

Question

Hello I have the following setup for a treeview:
<local:BuddyManager x:Key="bmBuddyManager" />
<CollectionViewSource x:Key="cvsBuddyManager"
Source="{Binding Source={StaticResource bmBuddyManager}, Path=Buddies}">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="State" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
<DataTemplate x:Key="dtBuddyTemplate" DataType="{x:Type local:Buddy}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Nick}" FontSize="12" FontWeight="Bold" />
<TextBlock Text="{Binding GameHost}" FontSize="12" FontWeight="Bold"
Foreground="Purple" Margin="10,0,0,0" />
</StackPanel>
</DataTemplate>
<HierarchicalDataTemplate x:Key="hdtBuddyCategoryTemplate" ItemsSource="{Binding Path=Items}"
ItemTemplate="{StaticResource dtBuddyTemplate}">
<TextBlock Text="{Binding Path=Name}" FontWeight="Bold" Foreground="Gold" FontSize="15" />
</HierarchicalDataTemplate>
<TreeView ItemsSource="{Binding Source={StaticResource cvsBuddyManager}, Path=Groups}"
ItemTemplate="{StaticResource hdtBuddyCategoryTemplate}"
ContextMenuOpening="tvBuddies_ContextMenuOpening"
ContextMenuClosing="tvBuddies_ContextMenuClosing"
Background="Transparent" Margin="2,0,3,3">
</TreeView>
Code Behind:
<System.Runtime.InteropServices.ComVisible(False)> Public Enum BuddyState
Online
Offline
Blocked
End Enum
<System.Runtime.InteropServices.ComVisible(False)> Public Class Buddy
Implements INotifyPropertyChanged
Private _Nick As String
Private _IsInGame As Boolean
Private _GameHost As String
Private _State As BuddyState
Sub New(ByVal xwisNick As String)
_Nick = xwisNick
_State = BuddyState.Offline
End Sub
Sub New(ByVal xwisNick As String, ByVal state As BuddyState)
_Nick = xwisNick
_State = state
End Sub
Public Property Nick() As String
Get
Return _Nick
End Get
Set(ByVal value As String)
_Nick = value
End Set
End Property
Public Property IsInGame() As Boolean
Get
Return _IsInGame
End Get
Set(ByVal value As Boolean)
_IsInGame = value
If _IsInGame = False Then
GameHost = Nothing
End If
OnPropertyChanged("IsInGame")
End Set
End Property
Public Property GameHost() As String
Get
Return _GameHost
End Get
Set(ByVal value As String)
_GameHost = value
OnPropertyChanged("GameHost")
End Set
End Property
Public Property State() As BuddyState
Get
Return _State
End Get
Set(ByVal value As BuddyState)
_State = value
If value = BuddyState.Online Then
If _IsInGame Then
_IsInGame = False
_GameHost = Nothing
End If
End If
OnPropertyChanged("State")
End Set
End Property
Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
' Create the OnPropertyChanged method to raise the event
Protected Sub OnPropertyChanged(ByVal name As String)
Try
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name))
Catch
End Try
End Sub
End Class
Public Class BuddyManager
Implements INotifyPropertyChanged
Private ocBuddies As ObservableCollection(Of Buddy) = New ObservableCollection(Of Buddy)
Public ReadOnly Property Buddies As ObservableCollection(Of Buddy)
Get
Return ocBuddies
End Get
End Property
Public BuddyCheck As List(Of Buddy) = New List(Of Buddy)
Public IsCheckingForBuddies As Boolean = False
Public Function IsBuddy(ByVal XwisNick As String) As Boolean
Dim nick As String = XwisNick.ToLower
For Each b As Buddy In ocBuddies
If b.Nick = nick Then
Return True
End If
Next
Return False
End Function
Public Function IsInGame(ByVal XwisNick As String) As String
Dim nick As String = XwisNick.ToLower
For Each b As Buddy In ocBuddies
If b.Nick = nick Then
If b.IsInGame Then
Return b.GameHost
Else
Return Nothing
End If
End If
Next
Return Nothing
End Function
Public Function AddBuddy(ByVal XwisNick As String) As Boolean
Dim nick As String = XwisNick.ToLower
For Each b As Buddy In ocBuddies
If b.Nick = nick Then
Return False
End If
Next
ocBuddies.Add(New Buddy(nick))
OnPropertyChanged("Buddies")
Return True
End Function
Public Function RemoveBuddy(ByVal XwisNick As String) As Boolean
Dim nick As String = XwisNick.ToLower
For i As Integer = 0 To ocBuddies.Count - 1
If ocBuddies(i).Nick = nick Then
ocBuddies.RemoveAt(i)
OnPropertyChanged("Buddies")
Return True
End If
Next
Return False
End Function
Public Function BlockBuddy(ByVal XwisNick As String) As Boolean
Dim nick As String = XwisNick.ToLower
For i As Integer = 0 To ocBuddies.Count - 1
If ocBuddies(i).Nick = nick Then
ocBuddies(i).State = BuddyState.Blocked
OnPropertyChanged("Buddies")
Return True
End If
Next
ocBuddies.Add(New Buddy(nick, BuddyState.Blocked))
OnPropertyChanged("Buddies")
Return True
End Function
Public Function UnblockBuddy(ByVal XwisNick As String) As Boolean
Dim nick As String = XwisNick.ToLower
For i As Integer = 0 To ocBuddies.Count - 1
If ocBuddies(i).Nick = nick Then
ocBuddies(i).State = BuddyState.Offline
OnPropertyChanged("Buddies")
Return True
End If
Next
Return False
End Function
Public Sub UpdateOnlineStatus(ByVal XwisNick As String, ByVal online As Boolean)
Dim nick As String = XwisNick.ToLower
For i As Integer = 0 To ocBuddies.Count - 1
If ocBuddies(i).Nick = nick Then
If online Then
ocBuddies(i).State = BuddyState.Online
Else
ocBuddies(i).State = BuddyState.Offline
End If
OnPropertyChanged("Buddies")
Exit For
End If
Next
RaiseEvent BuddyOnlineStatusChanged(nick, online)
End Sub
Public Sub UpdateInGameStatus(ByVal XwisNick As String, ByVal gamehost As String)
Dim nick As String = XwisNick.ToLower
For i As Integer = 0 To ocBuddies.Count - 1
If ocBuddies(i).Nick = nick Then
ocBuddies(i).IsInGame = True
ocBuddies(i).GameHost = gamehost
OnPropertyChanged("Buddies")
RaiseEvent BuddyGameStatusChanged(nick, gamehost)
Exit For
End If
Next
End Sub
Public Sub FillBuddyCheck()
BuddyCheck = ocBuddies.Where(Function(bud) bud.State <> BuddyState.Blocked).ToList
End Sub
Public Function GetBuddies() As IEnumerable(Of Buddy)
Return ocBuddies.Where(Function(bud) bud.State <> BuddyState.Blocked)
End Function
Public Sub Sort()
ocBuddies.OrderBy(Function(bud) bud.Nick)
OnPropertyChanged("Buddies")
End Sub
Public Function Count() As Integer
Return GetBuddies.Count
End Function
Public Event BuddyOnlineStatusChanged(ByVal nick As String, ByVal online As Boolean)
Public Event BuddyGameStatusChanged(ByVal nick As String, ByVal gamehost As String)
Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
' Create the OnPropertyChanged method to raise the event
Protected Sub OnPropertyChanged(ByVal name As String)
Try
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name))
Catch
End Try
End Sub
End Class
How I interact with the classes:
Public Function GetBuddyManager() As BuddyManager
Try
Return DirectCast(FindResource("bmBuddyManager"), BuddyManager)
Catch ex As Exception
MessageBox.Show("Error getting buddy manager object: " & ex.ToString())
Application.Current.Shutdown()
Return Nothing
End Try
End Function
GetBuddyManager().UpdateOnlineStatus(GetBuddyManager().BuddyCheck(0).Nick, True)
The Binding and grouping work well, the only issue is when I set a particular 'buddy' to online or blocked the child nodes do not move or change.
I am trying to get this to work like an MSN Treeview where people go offline and online.
Any help is appreciated, I have been working on this problem for a month or so with heavy research and no luck.
Thank you for your time.

Answer 1

Looks like you need an OnPropertyChanged event in the State property for VisualColor. The UI does not get a notification that the visual color should be updated. It knows that the State value has changed, but all that means is whatever is bound to the State property gets updated.
I would suggest putting those colors in XAML and writing a DataTrigger on your item, that evaluates the state and changes the color to suit.
Next as for not moving from one status category to another, when you set the state, have you looked at the CollectionViewSource at runtime to see how it is sorting? Are you calling a refresh on the CVS view anywhere?