ingame_menu.rs

use crate::{
    player_control::actions::{ActionsFrozen, UiAction},
    GameState,
};
use avian3d::prelude::*;
use bevy::{app::AppExit, prelude::*};
use bevy_egui::{egui, EguiContexts};
use leafwing_input_manager::prelude::ActionState;

/// Handles the pause menu accessed while playing the game via ESC.
pub(super) fn plugin(app: &mut App) {
    app.add_systems(Update, handle_pause.run_if(in_state(GameState::Playing)));
}

fn handle_pause(
    mut time: ResMut<Time<Virtual>>,
    mut physics_time: ResMut<Time<Physics>>,
    actions: Query<&ActionState<UiAction>>,
    mut app_exit_events: EventWriter<AppExit>,
    mut actions_frozen: ResMut<ActionsFrozen>,
    mut egui_contexts: EguiContexts,
    mut paused: Local<bool>,
) {
    for action in actions.iter() {
        let toggled = action.just_pressed(&UiAction::TogglePause);
        if toggled {
            if *paused {
                *paused = false;
                time.unpause();
                physics_time.unpause();
                actions_frozen.unfreeze();
            } else {
                *paused = true;
                time.pause();
                physics_time.pause();
                actions_frozen.freeze();
            }
        }
    }
    if !*paused {
        return;
    }

    egui::CentralPanel::default()
        .frame(egui::Frame {
            fill: egui::Color32::from_black_alpha(240),
            ..default()
        })
        .show(egui_contexts.ctx_mut(), |ui| {
            ui.vertical_centered_justified(|ui| {
                ui.visuals_mut().override_text_color = Some(egui::Color32::from_gray(240));
                ui.add_space(100.0);
                ui.heading("Game Paused");
                ui.separator();
                ui.label("Press ESC to resume");

                ui.add_space(100.0);

                if ui.button("Quit Game").clicked() {
                    app_exit_events.send(AppExit::Success);
                }
            });
        });
}