[RESOLVED] WPF CheckedListBox - CheckedChanged Event

I've created a simple checked list box for use in my WPF application. Annoyingly, I can't quite pin down how to get my form to listen for a CheckedChanged event firing for any of the items in the list box.

My code is as follows. Firstly, a class to hold the CheckedListItems:

Code:

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Imports System.ComponentModel

Public Class CheckedListItem(Of T)
    Implements INotifyPropertyChanged

    Public Event PropertyChanged(sender As Object, e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged
    Private _IsChecked As Boolean
    Private _Item As T

    Public Sub New()
    End Sub

    Public Sub New(item As T, Optional isChecked As Boolean = False)
        Me._Item = item
        Me._IsChecked = isChecked
    End Sub

    Public Property Item() As T
        Get
            Return _Item
        End Get
        Set(value As T)
            _Item = value
            RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("Item"))
        End Set
    End Property

    Public Property IsChecked() As Boolean
        Get
            Return _IsChecked
        End Get
        Set(value As Boolean)
            If Not _IsChecked = value Then
                _IsChecked = value
                RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("IsChecked"))
            End If
        End Set
    End Property

End Class

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Code in my window:

Code:

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Class ProgressWindow
    Implements INotifyPropertyChanged

    Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged

    Private _CycleJobItems As ObservableCollection(Of CheckedListItem(Of CycleJob))
    Public Property CycleJobItems() As ObservableCollection(Of CheckedListItem(Of CycleJob))
        Get
            Return _CycleJobItems
        End Get
        Set(value As ObservableCollection(Of CheckedListItem(Of CycleJob)))
            _CycleJobItems = value
        End Set
    End Property

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My XAML:

Code:

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        <ListBox Name="clbCycleJobs" ItemsSource="{Binding CycleJobItems}" Margin="98,76,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="167" Height="134">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <CheckBox Height="16" IsChecked="{Binding IsChecked}" Content="{Binding Path=Item.JobName}" IsTabStop="False" />
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

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Anyone got any ideas about the last piece of the jigsaw?

Thanks...

Moved to the WPF forum.

Okay, I figured it out. Had to make a small tweak to the code in my form, and then add the handlers; one for the list box to add a handler to each item that's added to the list box, and one that will be used for the items themselves.

Code:

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    Private _CycleJobItems As ObservableCollection(Of CheckedListItem(Of CycleJob))
    Public Property CycleJobItems() As ObservableCollection(Of CheckedListItem(Of CycleJob))
        Get
            Return _CycleJobItems
        End Get
        Set(value As ObservableCollection(Of CheckedListItem(Of CycleJob)))
            _CycleJobItems = value
            AddHandler CycleJobItems.CollectionChanged, AddressOf CycleJobItems_CollectionChanged
        End Set
    End Property

    Private Sub CycleJobItems_CollectionChanged(sender As Object, e As Specialized.NotifyCollectionChangedEventArgs)
        '# This means we're adding new items to the list.
        If e.NewItems IsNot Nothing Then
            For Each Item As CheckedListItem(Of CycleJob) In e.NewItems
                '# Add a handler for this item so that we can listen for the checkbox element
                '# being ticked or cleared.
                AddHandler Item.PropertyChanged, AddressOf CheckedListItem_PropertyChanged
            Next
        End If
        '# This means we're removing existing items from the list.
        If e.OldItems IsNot Nothing Then
            For Each Item As CheckedListItem(Of CycleJob) In e.OldItems
                '# Remove the handler for each item.
                RemoveHandler Item.PropertyChanged, AddressOf CheckedListItem_PropertyChanged
            Next
        End If
        '# Clearing the list doesn't provide an OldItems collections, so if the action is a reset and there's
        '# nothing in either collection, do whatever would happen if you removed each item individually.
        If e.Action = Specialized.NotifyCollectionChangedAction.Reset AndAlso e.OldItems Is Nothing AndAlso e.NewItems Is Nothing Then
            '# Do whatever
        End If
    End Sub

    Private Sub CheckedListItem_PropertyChanged(sender As Object, e As PropertyChangedEventArgs)
        '# Check that it was the IsChecked property that changed.
        If e.PropertyName = "IsChecked" Then
            Dim Item = TryCast(sender, CheckedListItem(Of CycleJob))
            '# If the item was ticked, add it to the collection of selected jobs unless it's already there.
            If Item.IsChecked Then
                '# Do whatever
            Else
                '# Do whatever
            End If
        End If
    End Sub

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