copied over from original version in game repo, full rewrite incomingg

.gitignore

@@ -0,0 +1,7 @@
+.envrc
+.direnv
+
+
+# Added by cargo
+
+/target

Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "s10e-bevy-menus"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+bevy = "0.16.1"

examples/basic.rs

@@ -0,0 +1,30 @@
+use bevy::prelude::*;
+use s10e_bevy_menus::{
+    MenuItemType,
+    menus::{FakeTrigger, Menu, Menus, SimpleMenus},
+};
+
+#[derive(States, Debug, Copy, Clone, PartialEq, Eq, Hash, Default, Reflect)]
+pub enum CurrentMenu {
+    NotInMenus,
+    #[default]
+    MainMenu,
+    MenuA,
+    MenuB,
+}
+
+fn main() {
+    let menus = SimpleMenus::new(CurrentMenu::NotInMenus, None).add_menu(
+        CurrentMenu::MainMenu,
+        Menu::new().add_items(&[
+            &MenuItemType::Text("Hello world".to_owned()),
+            &MenuItemType::Button("Meoww".to_owned()),
+        ]),
+    );
+
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .init_state::<CurrentMenu>()
+        .add_plugins(menus)
+        .run();
+}

flake.lock

@@ -0,0 +1,100 @@
+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1756622179,
+        "narHash": "sha256-K3CimrAcMhdDYkErd3oiWPZNaoyaGZEuvGrFuDPFMZY=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "0abcb15ae6279dcb40a8ae7c1ed980705245cb79",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1756636162,
+        "narHash": "sha256-mBecwgUTWRgClJYqcF+y4O1bY8PQHqeDpB+zsAn+/zA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "37ff64b7108517f8b6ba5705ee5085eac636a249",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1756597274,
+        "narHash": "sha256-wfaKRKsEVQDB7pQtAt04vRgFphkVscGRpSx3wG1l50E=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "21614ed2d3279a9aa1f15c88d293e65a98991b30",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,66 @@
+{
+  description = "Build a cargo project without extra checks";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      fenix,
+      flake-utils,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        rs-toolchain =
+          with fenix.packages.${system};
+          combine [
+            complete.toolchain
+          ];
+      in
+      {
+        devShells.default = pkgs.mkShell rec {
+          buildInputs = with pkgs; [
+            cargo-watch
+            pkg-config
+            rs-toolchain
+            udev
+            alsa-lib
+            glfw
+            freetype
+            vulkan-headers
+            vulkan-loader
+            vulkan-validation-layers
+            vulkan-tools # vulkaninfo
+            shaderc # GLSL to SPIRV compiler - glslc
+            renderdoc # Graphics debugger
+            tracy # Graphics profiler
+            vulkan-tools-lunarg
+            xorg.libX11
+            xorg.libXcursor
+            xorg.libXi
+            xorg.libXrandr # To use the x11 feature
+            libxkbcommon
+            wayland
+            clang
+            llvmPackages.bintools
+          ];
+
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
+        };
+      }
+    );
+}

src/cleanup.rs

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+use bevy::prelude::*;
+
+/// Despawn/cleanup every entity with `T`.
+/// See the [bevy cheatbook's cleanup example](https://bevy-cheatbook.github.io/patterns/generic-systems.html#example-cleanup).
+pub fn despawn<T: Component>(mut c: Commands, q: Query<Entity, With<T>>) {
+    for e in q {
+        c.entity(e).despawn();
+    }
+}

src/item.rs

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+use bevy::state::state::States;
+use types::{ItemPosition, MenuItemType, OnPressAction};
+
+pub mod types;
+
+#[derive(Debug, Clone)]
+pub(super) struct MenuItemInternal<NavState: States> {
+    pub(super) r#type: MenuItemType,
+    pub(super) pos: ItemPosition,
+    pub(super) action: Option<OnPressAction<NavState>>,
+}
+
+pub(super) trait IntoMenuItemInternal<NavState: States> {
+    fn item(&self) -> MenuItemInternal<NavState>;
+}
+
+impl<S: States, T: ?Sized + MenuItem<S>> IntoMenuItemInternal<S> for T {
+    fn item(&self) -> MenuItemInternal<S> {
+        MenuItemInternal {
+            r#type: self.item_type(),
+            pos: self.pos(),
+            action: self.action(),
+        }
+    }
+}
+
+pub trait MenuItem<NavState: States> {
+    fn item_type(&self) -> MenuItemType;
+    fn pos(&self) -> ItemPosition;
+    fn action(&self) -> Option<OnPressAction<NavState>>;
+}
+
+impl<NavState: States> MenuItem<NavState> for MenuItemType {
+    fn item_type(&self) -> MenuItemType {
+        self.clone()
+    }
+
+    fn pos(&self) -> ItemPosition {
+        ItemPosition::default()
+    }
+
+    fn action(&self) -> Option<OnPressAction<NavState>> {
+        None
+    }
+}
+
+impl<NavState: States> MenuItem<NavState> for (MenuItemType, OnPressAction<NavState>) {
+    fn item_type(&self) -> MenuItemType {
+        self.0.clone()
+    }
+
+    fn pos(&self) -> ItemPosition {
+        ItemPosition::default()
+    }
+
+    fn action(&self) -> Option<OnPressAction<NavState>> {
+        Some(self.1.clone())
+    }
+}

src/item/types.rs

@@ -0,0 +1,57 @@
+use std::ops::{Deref, DerefMut};
+
+use bevy::{
+    ecs::{
+        event::Event,
+        system::{Commands, SystemId},
+    },
+    state::state::{FreelyMutableState, NextState, States},
+};
+
+/// positions the item in the menu
+#[derive(Default, Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ItemPosition {
+    #[default]
+    MainView,
+    North,
+    NorthWest,
+    West,
+    SouthWest,
+    South,
+    SouthEast,
+    East,
+    NorthEast,
+}
+
+// TODO: replace strings with custom "content"?
+#[derive(Clone, Debug)]
+pub enum MenuItemType {
+    Text(String),
+    Button(String),
+    // Subsection(Vec<MenuItemType>),
+}
+
+#[derive(Clone, Debug)]
+pub enum OnPressAction<NavState: States> {
+    NavigateTo(NavState),
+    DispatchSystem(SystemId),
+    Multiple(Vec<OnPressAction<NavState>>),
+    Close,
+}
+
+impl<S: States + FreelyMutableState> OnPressAction<S> {
+    pub fn run(&self, c: &mut Commands, mut nav_state: &mut NextState<S>, closed_state: &S) {
+        dbg!(self);
+        match self {
+            OnPressAction::NavigateTo(to) => nav_state.set(to.clone()),
+            OnPressAction::DispatchSystem(system_id) => c.run_system(*system_id),
+            OnPressAction::Multiple(actions) => {
+                let mut actions = actions.clone();
+                while let Some(action) = actions.pop() {
+                    action.run(c, nav_state, closed_state);
+                }
+            }
+            OnPressAction::Close => nav_state.set(closed_state.clone()),
+        }
+    }
+}

src/lib.rs

@@ -0,0 +1,25 @@
+#![allow(unused, reason = "Temporary.")]
+#![feature(iter_collect_into)]
+//! goal is a custom ui/menu library that allows simple and declarative menus.
+//! bevy ui is annoying.
+//!
+//! TODOs:
+//! - [ ] cleanup
+//! - [ ] trigger game events (trigger or normal eventwriter?)
+//! - [ ] styling
+//! - [ ] more components
+//! - [ ] more shorthands
+
+use std::marker::PhantomData;
+
+use bevy::{platform::collections::HashMap, prelude::*};
+
+mod item;
+pub mod plugin;
+
+mod cleanup;
+pub mod menus;
+pub use item::types::*;
+pub use item::*;
+
+type ToDo = ();

src/menus.rs

@@ -0,0 +1,77 @@
+use bevy::{platform::collections::HashMap, prelude::*};
+
+use super::{IntoMenuItemInternal, ItemPosition, MenuItem, MenuItemInternal};
+
+#[derive(States, Clone, Eq, PartialEq, Hash, Debug, Copy, Default)]
+pub struct FakeTrigger;
+
+pub type SimpleMenus<S> = Menus<FakeTrigger, S>;
+
+#[derive(Debug, Clone)]
+pub struct Menus<TriggerState, NavState>
+where
+    TriggerState: States,
+    NavState: States,
+{
+    pub(super) start: NavState,
+    pub(super) closed_when: NavState,
+    /// The state needed to trigger this set of menus
+    pub(super) trigger: Option<TriggerState>,
+    pub(super) menus: HashMap<NavState, Menu<NavState>>,
+}
+
+#[derive(Debug, Clone)]
+pub struct Menu<ParentNavState: States> {
+    pub(super) menu_items: Vec<MenuItemInternal<ParentNavState>>,
+}
+
+impl<TriggerState, NavState> Menus<TriggerState, NavState>
+where
+    TriggerState: States,
+    NavState: States + Default,
+{
+    pub fn new(closed_when: NavState, trigger: Option<TriggerState>) -> Self {
+        Self {
+            trigger,
+            closed_when,
+            start: NavState::default(),
+            menus: HashMap::new(),
+        }
+    }
+}
+
+impl<T, NavState> Menus<T, NavState>
+where
+    T: States,
+    NavState: States,
+{
+    pub fn add_menu(mut self, state: NavState, menu: Menu<NavState>) -> Self {
+        self.menus.insert(state, menu);
+        self
+    }
+}
+
+impl<ParentNavState: States> Menu<ParentNavState> {
+    pub fn new() -> Self {
+        Self {
+            menu_items: Vec::new(),
+        }
+    }
+
+    /// Adds `items` in the default `ItemPosition::MainView`.
+    pub fn add_items(mut self, items: &[&dyn MenuItem<ParentNavState>]) -> Self {
+        self.add_items_positioned(ItemPosition::MainView, items)
+    }
+
+    pub fn add_items_positioned(
+        mut self,
+        position: ItemPosition,
+        items: &[&dyn MenuItem<ParentNavState>],
+    ) -> Self {
+        items
+            .iter()
+            .map(|it| (*it).item())
+            .collect_into(&mut self.menu_items);
+        self
+    }
+}

src/plugin.rs

@@ -0,0 +1,161 @@
+use std::marker::PhantomData;
+
+use bevy::{
+    ecs::spawn::SpawnIter, platform::collections::HashMap, prelude::*,
+    state::state::FreelyMutableState,
+};
+
+use crate::cleanup::despawn;
+
+use super::{
+    ItemPosition, MenuItemInternal, MenuItemType, OnPressAction,
+    menus::{Menu, Menus},
+};
+
+mod components;
+
+impl<TriggerState, NavState> Plugin for Menus<TriggerState, NavState>
+where
+    TriggerState: States + Copy,
+    NavState: States + FreelyMutableState + Copy,
+{
+    fn build(&self, app: &mut App) {
+        app.insert_state(self.start)
+            .insert_resource(self.get_store())
+            .insert_resource(MenusClosedWhen(self.closed_when))
+            .add_observer(build_ui::<NavState>)
+            .add_observer(destroy_ui::<NavState>)
+            // .add_observer(destroy_ui::<NavStates>)
+            .add_systems(Update, (update_ui_trigger::<NavState>,));
+
+        if let Some(trigger) = &self.trigger {
+            app.add_systems(
+                Update,
+                handle_press_actions::<NavState>.run_if(in_state(*trigger)),
+            )
+            .add_systems(OnExit(*trigger), close_menu::<NavState>);
+        } else {
+            app.add_systems(Update, handle_press_actions::<NavState>);
+        }
+    }
+}
+
+#[derive(Event)]
+struct DestroyUi<S: States>(PhantomData<S>);
+#[derive(Event)]
+struct BuildUi<S: States>(S);
+
+#[derive(Component)]
+struct UiParent<S: States>(PhantomData<S>);
+#[derive(Component)]
+struct UiComponent;
+
+#[derive(Component)]
+struct Action<S: States>(OnPressAction<S>);
+
+impl<T: States, S: States> Menus<T, S> {
+    fn get_store(&self) -> MenusStore<S> {
+        MenusStore(self.menus.clone())
+    }
+}
+
+fn close_menu<S: States + FreelyMutableState>(
+    mut c: Commands,
+    mut nav_state: ResMut<NextState<S>>,
+    closed_when: Res<MenusClosedWhen<S>>,
+) {
+    c.run_system_cached(despawn::<UiParent<S>>);
+    nav_state.set(closed_when.0.clone());
+}
+
+#[derive(Resource)]
+struct MenusStore<S: States>(HashMap<S, Menu<S>>);
+#[derive(Resource)]
+struct MenusClosedWhen<S: States>(S);
+
+fn destroy_ui<S: States>(
+    trigger: Trigger<DestroyUi<S>>,
+    ui_parent: Query<Entity, With<UiParent<S>>>,
+    mut c: Commands,
+) {
+    trace!("destroy_ui called");
+    if let Ok(parent) = ui_parent.single_inner() {
+        c.entity(parent).despawn();
+    }
+}
+
+fn build_ui<S: States>(
+    trigger: Trigger<BuildUi<S>>,
+    ui_parent: Query<Entity, With<UiParent<S>>>,
+    mut c: Commands,
+    menus_data: Res<MenusStore<S>>,
+) {
+    let e = trigger.event();
+    let Some(menu_structure) = menus_data.0.get(&e.0) else {
+        return;
+    };
+
+    let items = menu_structure
+        .menu_items
+        .clone()
+        .into_iter()
+        // TODO: implement other item positions
+        .filter(|it| ItemPosition::MainView == it.pos);
+
+    c.spawn((
+        UiParent(PhantomData::<S>),
+        Node {
+            width: Val::Percent(100.0),
+            height: Val::Percent(100.0),
+            align_items: AlignItems::Center,
+            justify_content: JustifyContent::Center,
+            flex_direction: FlexDirection::Column,
+            ..default()
+        },
+    ))
+    .with_children(|parent| {
+        for MenuItemInternal { r#type, action, .. } in items {
+            let mut e = match r#type {
+                MenuItemType::Text(s) => parent.spawn(components::text(s)),
+                MenuItemType::Button(s) => parent.spawn(components::button(s)),
+            };
+            e.insert(UiComponent);
+
+            if let Some(action) = action {
+                e.insert(Action(action));
+            }
+        }
+    });
+}
+
+fn handle_press_actions<S: States + FreelyMutableState>(
+    mut c: Commands,
+    mut interaction_query: Query<(&Interaction, &Action<S>), Changed<Interaction>>,
+    mut nav_state: ResMut<NextState<S>>,
+    closed_when: Res<MenusClosedWhen<S>>,
+) {
+    for (interaction, Action(action)) in interaction_query {
+        if *interaction != Interaction::Pressed {
+            continue;
+        }
+        action.run(&mut c, &mut nav_state, &closed_when.0);
+    }
+}
+
+fn update_ui_trigger<S: States + PartialEq>(
+    mut c: Commands,
+    mut trans_reader: EventReader<StateTransitionEvent<S>>,
+    menus_data: Res<MenusStore<S>>,
+    closed_when: Res<MenusClosedWhen<S>>,
+) {
+    for trans in trans_reader.read() {
+        info!("{trans:?}");
+
+        c.trigger(DestroyUi(PhantomData::<S>));
+        if let Some(to_build) = trans.entered.clone() {
+            if to_build != closed_when.0 {
+                c.trigger(BuildUi(to_build));
+            }
+        }
+    }
+}

src/plugin/components.rs

@@ -0,0 +1,37 @@
+use bevy::prelude::*;
+
+use crate::OnPressAction;
+
+use super::Action;
+
+pub fn text(t: String) -> impl Bundle {
+    (
+        Text::new(t),
+        TextFont {
+            // font: asset_server.load("fonts/FiraSans-Bold.ttf"),
+            font_size: 33.0,
+            ..default()
+        },
+        TextColor(Color::srgb(0.9, 0.9, 0.9)),
+        TextShadow::default(),
+    )
+}
+
+pub fn button(t: String) -> impl Bundle {
+    (
+        Button,
+        Node {
+            border: UiRect::all(Val::Px(5.0)),
+            // horizontally center child text
+            justify_content: JustifyContent::Center,
+            // vertically center child text
+            align_items: AlignItems::Center,
+            padding: UiRect::all(Val::Px(10.0)),
+            ..default()
+        },
+        BorderColor(Color::BLACK),
+        BorderRadius::MAX,
+        BackgroundColor(Color::srgb(0.2, 0.2, 0.2)),
+        children![text(t)],
+    )
+}