CODEWITHSUNDEEP
c#wpfmvvmfocus
Sinatr
Sinatr

Reputation: 21999

ListViewItem focus

Using MVVM:

<ListView ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" ... />

ViewModel:

public class Item: INotifyPropertyChanged { ... }

public ObservableCollection<Item> Items { get; set; }

public Item SelectedItem { get; set; }

Now if I change SelectedItem

// change
Items = new ObservableCollection<Item>(...);
SelectedItem = Items.FirstOrDefault(item => ... some condition);
// notify view
OnPropertyChanged();
OnPropertyChanged(nameof(SelectedItem));

Then wanted item become properly selected, but it's not focused. Using keyboard navigation if I give focus to ListView somehow, then the very first item will become selected and focused.

How to give SelectedItem focus?

Upvotes: 0

Views: 1720

Answers (2)

Il Vic
Il Vic

Reputation: 5666

Personally I prefer to put my control's behavior logic inside the control's code. What I mean is to extend standard controls in order to change their behavior in the way I need.

First of all I need to extend the ListViewItem control:

namespace Sample
{
    public class ListViewItem : System.Windows.Controls.ListViewItem
    {
        protected override void OnSelected(RoutedEventArgs e)
        {
            base.OnSelected(e);

            if (IsSelected)
            {
                Focus();
            }
        }
    }
}

Then I need a ListView control which uses my ListViewItem:

namespace Sample
{
    public class ListView : System.Windows.Controls.ListView
    {
        protected override DependencyObject GetContainerForItemOverride()
        {
            return new ListViewItem();
        }
    }
}

So my XAML will become:

<local:ListView ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" ... />

I hope it can help you.

Upvotes: 1

Sinatr
Sinatr

Reputation: 21999

One possibility is to automatically focus selected ListViewItem when ListView has focus.

xaml:

<ListView.ItemContainerStyle>
    <Style TargetType="ListViewItem">
        <EventSetter Event="Selected" Handler="ListViewItem_Selected" />
    </Style>
</ListView.ItemContainerStyle>

view cs:

void ListViewItem_Selected(object sender, RoutedEventArgs e) 
{
    if (listView.IsFocused)
        (e.Source as ListViewItem)?.Focus();
}

Upvotes: 1

Related Questions