How do I tell when a ListViewItem gets focus? - xaml

Question

I have a UWP XAML ListView, and I would like to handle focus events when I switch between items within with arrow keys. However, I cannot figure out how to handle focus events for my items:
<ListView ItemsSource="{x:Bind Items}"
CanDragItems="True" CanReorderItems="True" AllowDrop="True"
SelectionMode="None" IsItemClickEnabled="True" ItemClick="ListView_ItemClick">
<ListView.ItemTemplate>
<DataTemplate x:DataType="x:String">
<!-- Never fires, even with Control.IsTemplateFocusTarget="True" : -->
<StackPanel GotFocus="StackPanel_GotFocus">
<!-- Never fires: -->
<TextBlock Text="{x:Bind}" GotFocus="TextBlock_GotFocus" />
<Button Content="Foo" IsTabStop="False" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<!-- Never fires: -->
<ListViewItemPresenter [...]
GotFocus="Root_GotFocus" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
</ListView>
Where else could I listen to get these focus events?
Thanks!
Disclaimer: I work for Microsoft.

Answer 1

When using <ListView> or <ListBox> you don't need to use GotFocus events.
Instead you use SelectionChanged event in the main <listView> control, and in code get the index of the <ListViewItem> that got selected.
SelectionChanged event is triggered every time the user change his selection in the <ListView>.
ListView.SelectedIndex returns the index number of the selected <ListViewItem> First item is 0.
Here is an example:
XAML:
<Image x:Name="img"/>
<ListView x:Name="listView" SelectionChanged="ListView_SelectionChanged">
<ListViewItem>Image 1</ListViewItem>
<ListViewItem>Image 2</ListViewItem>
<ListViewItem>Image 3</ListViewItem>
</ListView>
C#:
private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
int num = listView.SelectedIndex + 1;
img.Source = new BitmapImage(new Uri($"ms-appx:///Assets/Pictures/image{num}.jpg"));
}