🏃‍♂️ Bevy Quickmenu

Every game needs menus. Be it for the settings, for a pause screen, or for the main menu when the user enters the game.

While Bevy UI allows building menus, it is a cumbersome process especially if nested menus are needed. Even worse, though, is the effort required if you want your menu to be accessible with a keyboard, a gamepad, or the mouse.

Bevy Quickmenu offers all that. It is a super lightweight way of building in-game menus that can be controlled by all input devices. It even offers a simple way of having hover states. Everything can also be customized.

• Super simple menu plugin for bevy, building upon Bevy UI
• Keyboard, Mouse, Gamepad input is processed
• Support mouse hover states in simplified Stylesheet
• Many customizations possible (see examples/custom.rs)

Usage

Add to Cargo.toml:

toml [dependencies] bevy_quickmenu = "0.1.1"

Demo

Quick Examples

• examples/basic.rs: Basic example to show how it works
• examples/settings.rs: Full blown user settings including switching game states and showing the menu again
• examples/custom.rs: Showcase customization options

An explanation of the required components

State

A generic type that hosts the state of your menu (e.g. which items are selected, and so on). Whenever this state changes, the menu is automatically redrawn.

Action

(Conforms to ActionTrait): This enum defines all the actions your user can take. Such as SoundOn, SoundOff etc. When a user performs an action (by selecting the corresponding menu entry), the handle method is called on your ActionTrait implementation. ActionTrait has two generic types: Your State as well as a Event which you can define. This allows you to handle your action:

``` rs

[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]

enum Actions { Close, SoundOn, SoundOff, Control(usize, ControlDevice), }

impl ActionTrait for Actions { type State = CustomState; type Event = MyEvent; fn handle(&self, state: &mut CustomState, eventwriter: &mut EventWriter) { match self { Actions::Close => eventwriter.send(MyEvent::CloseSettings), Actions::SoundOn => state.soundon = true, Actions::SoundOff => state.soundon = false, Actions::Control(p, d) => { state.controls.insert(*p, *d); } } } } ```

Screen

(Conforms to the ScreenTrait). Each page or screen in your menu is defined by this enum. Note that menu screens are not nested!. Instead the ScreenTrait has a resolve function that allows you to return the corresponding menu definition for the given enum:

``` rs

[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]

enum Screens { Root, Controls, Sound, Player(usize), }

impl ScreenTrait for Screens { type Action = Actions; fn resolve(&self, state: &mut CustomState) -> Menu { match self { Screens::Root => rootmenu(state), Screens::Controls => controlsmenu(state), Screens::Sound => soundmenu(state), Screens::Player(p) => playercontrols_menu(state, *p), } } } ```

Menu

A menu is just a function that returns a list of MenuItem to be displayed. Each menu needs to have a distinct id. The example shows how the root and the sound menu are defined.

``` rs fn rootmenu(state: &mut CustomState) -> Menu { Menu::new( Id::new("root"), vec![ MenuItem::headline("Settings"), MenuItem::action("Back", Actions::Close).withicon(MenuIcon::Back), MenuItem::screen("Sound", Screens::Sound).withicon(MenuIcon::Sound), MenuItem::screen("Controls", Screens::Controls).with_icon(MenuIcon::Controls), ], ) }

fn soundmenu(state: &mut CustomState) -> Menu { Menu::new( Id::new("sound"), vec![ MenuItem::label("Toggles sound and music"), MenuItem::action("On", Actions::SoundOn).checked(state.soundon), MenuItem::action("Off", Actions::SoundOff).checked(!state.sound_on), ], ) } ```

MenuItem

In order to give you some flexibility, the menu item allows you to return five different types:

• MenuItem::label: A small text label that cannot be selected
• MenuItem::headline: A big text label that cannot be selected
• MenuItem::action: A action that is performed when the user selects it
• MenuItem::screen: Dive into a screen when the user selects this
• MenuItem::image: A single image (including an optional Style)

In addition, a menu-item can have one of a couple of pre-defined icons or a custom icon

rs MenuItem::screen("Controls", Screens::Controls).with_icon(MenuIcon::Controls) MenuItem::screen("Save", Screens::Save).with_icon(MenuIcon::Other(icons.save.clone()))

MenuItems can also be checked or unchecked:

rs MenuItem::action("On", Actions::SoundOn).checked(state.sound_on) MenuItem::action("Off", Actions::SoundOff).checked(!state.sound_on)

Displaying a Menu

Here's a the annoated setup function from the example:

``` rs impl Plugin for SettingsPlugin { fn build(&self, app: &mut App) { app // Register a event that can be called from your action handler .addevent::() // The plugin .addplugin(QuickMenuPlugin::::new()) // Some systems .addstartupsystem(setup) .addsystem(eventreader); } }

fn setup(mut commands: Commands) { commands.spawn(Camera3dBundle::default()); commands.insert_resource(MenuState::new( BasicState::default(), Screens::Root, Some(StyleSheet::default()), )) } ```

Removing a Menu

In order to remove a menu, there's the bevy_quickmenu::cleanup function. Usually, it is best to use it with the event that Bevy Quickmenu allows you to register:

``` rs

[derive(Debug)]

enum BasicEvent { Close, }

impl ActionTrait for Actions { fn handle(&self, state: &mut BasicState, eventwriter: &mut EventWriter) { match self { Actions::Close => eventwriter.send(BasicEvent::Close), } } }

fn eventreader(mut commands: Commands, mut eventreader: EventReader) { for event in eventreader.iter() { match event { BasicEvent::Close => bevyquickmenu::cleanup(&mut commands), } } } ```

Screenshot from the customized screen