Function bevy::ui::ui_focus_system

pub fn ui_focus_system(
    state: Local<'_, State>,
    camera: Query<'_, '_, (&Camera, Option<&UiCameraConfig>), ()>,
    windows: Res<'_, Windows>,
    mouse_button_input: Res<'_, Input<MouseButton>>,
    touches_input: Res<'_, Touches>,
    ui_stack: Res<'_, UiStack>,
    node_query: Query<'_, '_, NodeQuery, ()>
)

The system that sets Interaction for all UI elements based on the mouse cursor activity

Entities with a hidden ComputedVisibility are always treated as released.