sky_hero/src/main.rs

use bevy::{
    prelude::*,
    window::PresentMode,
    winit::WinitSettings,
};

#[derive(Component)]
struct Person;

#[derive(Component)]
struct Name(String);

#[derive(Resource)]
struct GreetTimer(Timer);

pub struct HelloPlugin;

impl Plugin for HelloPlugin {
    fn build(&self, app: &mut App) {
        app.insert_resource(GreetTimer(Timer::from_seconds(2.0, TimerMode::Repeating)))
            .add_startup_system(add_people)
            .add_system(greet_people);
    }
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins.set(WindowPlugin {
            primary_window: Some(Window {
                title: "Sky Hero".into(),
                resolution:(640., 480.).into(),
                present_mode: PresentMode::AutoVsync,
                // Tells wasm to resize the window according to the available canvas
                fit_canvas_to_parent: false,
                // Tells wasm not to override default event handling, like F5, Ctrl+R etc.
                prevent_default_event_handling: false,
                ..default()
            }),
            ..default()}))
        .add_plugin(HelloPlugin)
        .insert_resource(WinitSettings::desktop_app())
        .add_startup_system(setup)
        .add_system(file_drop)
        .add_system(button_system)
        .run();
}

#[allow(dead_code)]
fn hello_world(time: Res<Time>, mut timer: ResMut<GreetTimer>) {
    if timer.0.tick(time.delta()).just_finished() {
        println!("Hello, world!");
    }
}

fn file_drop(mut dnd_evr: EventReader<FileDragAndDrop>) {
    for ev in dnd_evr.iter() {
        println!("{:?}", ev);
        if let FileDragAndDrop::DroppedFile { window, path_buf } = ev {
            println!("Dropped file with path: {:?} in window id: {:?}", path_buf, window);
        }
    }
}

const NORMAL_BUTTON: Color = Color::rgb(0.15, 0.15, 0.15);
const HOVERED_BUTTON: Color = Color::rgb(0.25, 0.25, 0.25);
const PRESSED_BUTTON: Color = Color::rgb(0.35, 0.75, 0.35);

fn button_system(
    mut interaction_query: Query<
    (&Interaction, &mut BackgroundColor, &Children),
    (Changed<Interaction>, With<Button>),
    >,
    mut text_query: Query<&mut Text>,
    ) {
    for (interaction, mut color, children) in &mut interaction_query {
        let mut text = text_query.get_mut(children[0]).unwrap();
        match *interaction {
            Interaction::Clicked => {
                text.sections[0].value = "Press".to_string();
                *color = PRESSED_BUTTON.into();
                println!("TA APPUYE SUR LE BOUTON MAON SANG");
            }
            Interaction::Hovered => {
                text.sections[0].value = "Hover".to_string();
                *color = HOVERED_BUTTON.into();
            }
            Interaction::None => {
                text.sections[0].value = "Button".to_string();
                *color = NORMAL_BUTTON.into();
            }
        }
    }
}

fn add_people(mut commands: Commands) {
    commands.spawn((Person, Name("Elaine Proctor".to_string())));
    commands.spawn((Person, Name("Renzo Hume".to_string())));
    commands.spawn((Person, Name("Zayna Nieves".to_string())));
}

fn greet_people(time: Res<Time>, mut timer: ResMut<GreetTimer>, query: Query<&Name, With<Person>>) {
    if timer.0.tick(time.delta()).just_finished() {
        for name in &query {
            println!("hello {}!", name.0);
        }
    }
}

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    // ui camera
    commands.spawn(Camera2dBundle::default());
    commands
        .spawn(NodeBundle {
            style: Style {
                size: Size::width(Val::Percent(100.0)),
                align_items: AlignItems::Center,
                justify_content: JustifyContent::Center,
                ..default()
            },
            ..default()
        })
    .with_children(|parent| {
        parent
            .spawn(ButtonBundle {
                style: Style {
                    size: Size::new(Val::Px(150.0), Val::Px(65.0)),
                    // horizontally center child text
                    justify_content: JustifyContent::Center,
                    // vertically center child text
                    align_items: AlignItems::Center,
                    ..default()
                },
                background_color: NORMAL_BUTTON.into(),
                ..default()
            })
        .with_children(|parent| {
            parent.spawn(TextBundle::from_section(
                    "Button",
                    TextStyle {
                        font: asset_server.load("fonts/LinLibertine_Rah.ttf"),
                        font_size: 40.0,
                        color: Color::rgb(0.9, 0.9, 0.9),
                    },
                    ));
        });
    });
}