CODEWITHSUNDEEP
c#.netwpf
Malcolm
Malcolm

Reputation: 12874

WPF - How do determine the index of the current item in a listbox from button handler

i have a listbox with a data template that contains a button.

When the button is clicked I want to get in the button click handler the index of the listbox item that was current??

How do I do this please?

Malcolm

Upvotes: 3

Views: 5443

Answers (6)

AliOsat Mostafavi
AliOsat Mostafavi

Reputation: 373

Hi you can use ContentPresenter.Content to get current item , instead of current index:

<DataTemplate DataType="{x:Type MyModel}">                    
            <StackPanel Orientation="Horizontal" Margin="0 5">
                <TextBlock Text="{Binding Title}" />

                <Button Content="Active" Click="Button_Click" />
            </StackPanel>
 </DataTemplate>

and in code:

private void Button_Click(object sender, RoutedEventArgs e)
    {
            var button = e.Source as Button;
            var contentPresenter = button.TemplatedParent as ContentPresenter;
            var myModel = (MyModel)contentPresenter.Content;            
    }

Upvotes: 0

Splatbang
Splatbang

Reputation: 776

myListbox.Items.CurrentItem seems be what you are looking for.

Upvotes: 0

Jean-Marie
Jean-Marie

Reputation: 307

Probably way to late but using "IndexOf" on the listbox "Items" will give you the index # Regards

Upvotes: 0

Jay
Jay

Reputation: 14481

Have you checked the "SelectedIndex" property of the listbox? It might be set by clicking on the button.

Upvotes: 0

Jobi Joy
Jobi Joy

Reputation: 50048

More appropriate answer,

private void Button_Click(object sender, RoutedEventArgs e)
{
   DependencyObject dep = (DependencyObject)e.OriginalSource;

   while ((dep != null) && !(dep is ListViewItem))
   {
     dep = VisualTreeHelper.GetParent(dep);
   }

   if (dep == null)
    return;

   int index = lstBox.ItemContainerGenerator.IndexFromContainer(dep); 
}

Upvotes: 5

Jobi Joy
Jobi Joy

Reputation: 50048

Hope the bellow code will help you. 

private void Button_Click(object sender, RoutedEventArgs e)
{
    var b = (Button)sender;
    var grid = (Grid)b.TemplatedParent
    var lstItem = (ListBoxItem)grid.TemplatedParent;
    int index = lstBox.ItemContainerGenerator.IndexFromContainer(lstItem);
    // rest of your code here...
}

And the XAML for the above assumed to be a DataTemplate on a ListBox named lstBox:

<DataTemplate x:Key="template">
  <Grid>
    <Button Click="Button_Click" Content="Press"/>
  </Grid>
</DataTemplate>

Upvotes: 2

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