How to add items to a combobox with IronPython and XAML - xaml

Question

I have the following XAML
<ListView x:Name="listViewTarget" Height="560" Canvas.Left="10" Canvas.Top="101" Width="924" AllowDrop="True">
<ListView.View>
<GridView>
<GridViewColumn Width="350" Header="File or Email">
</GridViewColumn>
<GridViewColumn Width="500" Header="Awaiting Item" >
<GridViewColumn.CellTemplate>
<DataTemplate>
<ComboBox Width="350" x:Name="cboAI" HorizontalAlignment="Right">
</ComboBox>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
The ListView has two columns, in the second column I need a combobox of options.
I have a drag drop event associated with the ListView, when you drag a file onto the list the filenames are dynamically added successfully to the list view.
def listView_drag_drop(sender, e):
data = e.Data.GetData(DataFormats.FileDrop, False)
for s in data:
sender.Items.Add(s)
lstViewDropTarget = LogicalTreeHelper.FindLogicalNode(_tikitSender,listViewTarget')
lstViewDropTarget.Drop += listView_drag_drop
What I need to do inside that event is to also populate the combobox, which is currently empty.
I have tried to work out how to get a reference to the combobox to be able to set its ItemsSource property, but after days of effort I have failed.
I am new to IronPython and appreciate your help.
EDIT:
I tried many ways of getting a reference to the combo without success.
Now I am trying to use the Loaded event, but I get an error :
Failed to create a 'Loaded' from the text 'ComboBox_Loaded'
<ListView x:Name="listViewTarget" Height="560" Canvas.Left="10" Canvas.Top="101" Width="924" AllowDrop="True">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel x:Name="test">
<Label x:Name="textFileName" Content="ABC" />
<TextBlock Text="DEF"/>
<ComboBox
HorizontalAlignment="Left"
Margin="10,10,0,0"
VerticalAlignment="Top"
Width="120"
Loaded="ComboBox_Loaded"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
In Iron Python I define the event:
def ComboBox_Loaded(sender, e):
MessageBox.Show("Test")
EDIT 2:
Now I am trying to use the ListView CollectionChanged event
lstViewDropTarget.Items.CollectionChanged += ListView_ItemChanged
And here is the event code
def ListView_ItemChanged(sender, e):
MessageBox.Show(e.NewItems.Count.ToString())
That works messagebox shows '1'
So I can access the new item using e.NewItems[0]
But how do I access the controls?!
I try:
MessageBox.Show(e.NewItems[0].Children.Count.ToString())
and that fails to execute
so I try:
MessageBox.Show(e.NewItems[0].Content.Children.Count.ToString())
that also fails
I am very fed up, I cant believe its so very very hard

Answer 1

After trying many ideas and climbing the Iron Python learning curve I have a working solution. Whilst I have switched to a DataGrid, the method I have used would work with a ListView.
The first breakthrough came when I tried to bind the combobox to array within an iron python class. It just thought I would try and behold it worked!
There were further problems with SelectedItem and needing both a CellTemplate and a CellEditingTemplate, otherwise the selected item doesn't show when the combo loses focus.
I am quite pleased with the result, now I can just iterate through the DataGrid Items to save the results.
<DataGrid x:Name="gridUnknownDocuments" FontFamily="Segoe UI" FontWeight="Normal" FontSize="14" Height="294" Width="904" AutoGenerateColumns="False" SelectionUnit="Cell" Canvas.Left="20" Canvas.Top="39" >
<DataGrid.Columns>
<DataGridTextColumn Header="StepID" Binding="{Binding StepID}" IsReadOnly="True" />
<DataGridTextColumn Header="Document name" Binding="{Binding DocName}" IsReadOnly="True" />
<DataGridTemplateColumn Header="Awaiting Item">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="2" VerticalAlignment="Center" HorizontalAlignment="Left" Text="{Binding SelectedAwaitingItem, Mode=TwoWay}" Width="Auto" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox Height="23"
ItemsSource="{Binding Path= Items}"
SelectedValue="{Binding Path=SelectedAwaitingItem, Mode=TwoWay}" Width="Auto">
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGrid.Columns>
IronPython Class:
class UnknownDocuments(object):
def __init__(self, StepID, DocName,Items,FromTypes):
self.StepID = StepID
self.DocName = DocName
self.SelectedAwaitingItem = ""
self.Items = Items
self.FromTypes=FromTypes
self.SelectedFromType = ""
Populating the DataGrid (from SQL Server):
def PopUnknownDocuments():
# Populate unknown docs grid
strSql="EXEC upLean_GetUnknownDocuments #EntityRef='"+_tikitEntity+"', #MatterNo="+_tikitMatter.ToString()
gridUnknownDocs = LogicalTreeHelper.FindLogicalNode(_tikitSender, 'gridUnknownDocuments')
_tikitDbAccess.Open(strSql)
if _tikitDbAccess._dr is not None:
dr = _tikitDbAccess._dr
if dr.HasRows:
item = []
while dr.Read():
if not dr.IsDBNull(0):
item.append(UnknownDocuments(dr.GetString(0), dr.GetString(1),["NA","Awaiting A","Awaiting B"],["Internal","Client","Other Side"]))
gridUnknownDocs.ItemsSource = item
dr.Close()