Question

I’m trying to make a style for a listbox which will set the selected item to an item when the item has the mouse on it.

Any hints?

Answer 1

You can do it using a style in the ListBox itself that affects all its items:

<ListBox.Resources>
    <Style TargetType="ListBoxItem" BasedOn="{StaticResource {x:Type ListBoxItem}}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding IsMouseOver,RelativeSource={RelativeSource Self}}" 
                         Value="True">
                <Setter Property="IsSelected" Value="True" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</ListBox.Resources>

That’ll set the IsSelected property on the item to true when the IsMouseOver property is true. Provided your ListBox isn’t multi-select it works the way you’d expect.