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Initial port of bevy_ui_navigation to bevy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| mod queries; | ||
| mod systems; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| #[derive(Debug, Clone, Copy)] | ||
| pub struct Rect { | ||
| pub min: Vec2, | ||
| pub max: Vec2, | ||
| } | ||
| /// Camera modifiers for movement cycling. | ||
| /// | ||
| /// This is only used by the cycling routine to find [`Focusable`]s at the | ||
| /// opposite side of the screen. It's expected to contain the ui camera | ||
| /// projection screen boundaries and position. See implementation of | ||
| /// [`systems::update_boundaries`](crate::systems::update_boundaries) to | ||
| /// see how to implement it yourself. | ||
| /// | ||
| /// # Note | ||
| /// | ||
| /// This is a [resource](Res). It is optional and will log a warning if | ||
| /// a cycling request is made and it does not exist. | ||
| #[derive(Debug)] | ||
| pub struct ScreenBoundaries { | ||
| pub position: Vec2, | ||
| pub screen_edge: Rect, | ||
| pub scale: f32, | ||
| } | ||
|
|
||
| /// System parameter for the default cursor navigation system. | ||
| /// | ||
| /// It uses the bevy [`GlobalTransform`] to compute relative positions | ||
| /// and change focus to the correct entity. | ||
| /// It uses the [`ScreenBoundaries`] resource to compute screen boundaries | ||
| /// and move the cursor accordingly when it reaches a screen border | ||
| /// in a cycling menu. | ||
| #[derive(SystemParam)] | ||
| pub struct UiProjectionQuery<'w, 's> { | ||
| boundaries: Option<Res<'w, ScreenBoundaries>>, | ||
| transforms: Query<'w, 's, &'static GlobalTransform>, | ||
| } | ||
| impl<'w, 's> MoveParam for UiProjectionQuery<'w, 's> { | ||
| fn resolve_2d<'a>( | ||
| &self, | ||
| focused: Entity, | ||
| direction: events::Direction, | ||
| cycles: bool, | ||
| siblings: &'a [Entity], | ||
| ) -> Option<&'a Entity> { | ||
| use events::Direction::*; | ||
|
|
||
| let pos_of = |entity: Entity| { | ||
| self.transforms | ||
| .get(entity) | ||
| .expect("Focusable entities must have a GlobalTransform component") | ||
| .translation() | ||
| .xy() | ||
| }; | ||
| let focused_pos = pos_of(focused); | ||
| let closest = siblings.iter().filter(|sibling| { | ||
| direction.is_in(focused_pos, pos_of(**sibling)) && **sibling != focused | ||
| }); | ||
| let closest = max_by_in_iter(closest, |s| -focused_pos.distance_squared(pos_of(**s))); | ||
| match (closest, self.boundaries.as_ref()) { | ||
| (None, None) if cycles => { | ||
| warn!( | ||
| "Tried to move in {direction:?} from Focusable {focused:?} while no other \ | ||
| Focusables were there. There were no `Res<ScreenBoundaries>`, so we couldn't \ | ||
| compute the screen edges for cycling. Make sure you either add the \ | ||
| bevy_ui_navigation::systems::update_boundaries system to your app or implement \ | ||
| your own routine to manage a `Res<ScreenBoundaries>`." | ||
| ); | ||
| None | ||
| } | ||
| (None, Some(boundaries)) if cycles => { | ||
| let (x, y) = (boundaries.position.x, boundaries.position.y); | ||
| let edge = boundaries.screen_edge; | ||
| let scale = boundaries.scale; | ||
| let focused_pos = match direction { | ||
| // NOTE: up/down axises are inverted in bevy | ||
| North => Vec2::new(focused_pos.x, y - scale * edge.min.y), | ||
| South => Vec2::new(focused_pos.x, y + scale * edge.max.y), | ||
| East => Vec2::new(x - edge.min.x * scale, focused_pos.y), | ||
| West => Vec2::new(x + edge.max.x * scale, focused_pos.y), | ||
| }; | ||
| max_by_in_iter(siblings.iter(), |s| { | ||
| -focused_pos.distance_squared(pos_of(**s)) | ||
| }) | ||
| } | ||
| (anyelse, _) => anyelse, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub type NavigationPlugin<'w, 's> = GenericNavigationPlugin<UiProjectionQuery<'w, 's>>; | ||
|
|
||
| /// The navigation plugin and the default input scheme. | ||
| /// | ||
| /// Add it to your app with `.add_plugins(DefaultNavigationPlugins)`. | ||
| /// | ||
| /// This provides default implementations for input handling, if you want | ||
| /// your own custom input handling, you should use [`NavigationPlugin`] and | ||
| /// provide your own input handling systems. | ||
| pub struct DefaultNavigationPlugins; | ||
| impl PluginGroup for DefaultNavigationPlugins { | ||
| fn build(&mut self, group: &mut bevy::app::PluginGroupBuilder) { | ||
| group.add(GenericNavigationPlugin::<UiProjectionQuery>::new()); | ||
| group.add(DefaultNavigationSystems); | ||
| } | ||
| } |
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