// Scrolling list
parent
    .spawn((
        Node {
            flex_direction: FlexDirection::Column,
            align_self: AlignSelf::Stretch,
            height: Val::Percent(50.),
            overflow: Overflow::scroll_y(),
            ..default()
        },
        BackgroundColor(Color::srgb(0.10, 0.10, 0.10)),
    ))
    .observe(|
        trigger: Trigger<Pointer<Scroll>>,
        mut scroll_position_query: Query<&mut ScrollPosition>,
    | {
        if let Ok(mut scroll_position) = scroll_position_query.get_mut(trigger.target) {
            let (dx, dy) = match trigger.unit {
                MouseScrollUnit::Line => (trigger.x * 20., trigger.y * 20.),
                MouseScrollUnit::Pixel => (trigger.x, trigger.y),
            };
    
            scroll_position.offset_x -= dx;
            scroll_position.offset_y -= dy;
        }
    })
    .with_children(|parent| {
        // List items
        for i in 0..25 {
            parent
                .spawn((
                    Text(format!("Item {i}")),
                    TextFont {
                        font: asset_server.load("fonts/FiraSans-Bold.ttf"),
                        ..default()
                    },
                    Label,
                    AccessibilityNode(Accessible::new(Role::ListItem)),
                ))
                .insert(Pickable {
                    should_block_lower: false,
                    ..default()
                });
        }
    });