bevyjam/src/menu.rs

use crate::AppState;

use bevy::{
	input::{keyboard::KeyCode, Input},
	prelude::*,
};

pub struct MenuPlugin;

#[derive(Component)]
struct Menu;

impl Plugin for MenuPlugin {
	fn build(&self, app: &mut App) {
		app.add_system_set(SystemSet::on_enter(AppState::Menu).with_system(setup))
			.add_system_set(SystemSet::on_update(AppState::Menu).with_system(keyboard_input_system))
			.add_system_set(SystemSet::on_exit(AppState::Menu).with_system(despawn));
	}
}

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
	let font = asset_server.get_handle("UacariLegacy-Thin.ttf");
	commands
		.spawn_bundle(Text2dBundle {
			text: Text::from_section(
				"BEVYJAM",
				TextStyle {
					font: font.clone(),
					font_size: 96.0,
					color: Color::WHITE,
				},
			)
			.with_alignment(TextAlignment::CENTER),
			transform: Transform::from_xyz(0., 128.0, 0.),
			..Default::default()
		})
		.insert(Menu);
	commands
		.spawn_bundle(Text2dBundle {
			text: Text::from_section(
				"Press ENTER",
				TextStyle {
					font,
					font_size: 32.0,
					color: Color::WHITE,
				},
			)
			.with_alignment(TextAlignment::CENTER),
			..Default::default()
		})
		.insert(Menu);
}

fn despawn(mut commands: Commands, menu_query: Query<Entity, With<Menu>>) {
	for entity in menu_query.iter() {
		commands.entity(entity).despawn_recursive();
	}
}

fn keyboard_input_system(
	keyboard_input: Res<Input<KeyCode>>,
	mut app_state: ResMut<State<AppState>>,
) {
	if keyboard_input.just_pressed(KeyCode::Return) {
		app_state.replace(AppState::Game).unwrap()
	}
}