docs/bevy/examples/remote/app_under_test.rs 3.1 K · 102 lines · raw · history

1 //! A Bevy app that can be used as an integration test target.
2 //! It displays a button that must be clicked. The button is placed at a random position and
3 //! moves every 5 seconds.
4 //!
5 //! Run with the `bevy_remote` and `bevy_feathers` feature enabled:
6 //! ```bash
7 //! cargo run --example app_under_test --features="bevy_remote bevy_feathers"
8 //! ```
9 //! This example can be paired with the `integration_test` example, which will run an integration
10 //! test on this app.
11
12 use bevy::{
13 feathers::{
14 controls::FeathersButton, dark_theme::create_dark_theme, display::caption, theme::UiTheme,
15 FeathersPlugins,
16 },
17 prelude::*,
18 remote::{http::RemoteHttpPlugin, RemotePlugin},
19 time::common_conditions::on_timer,
20 ui::UiGlobalTransform,
21 };
22 use chacha20::ChaCha8Rng;
23 use rand::{RngExt, SeedableRng};
24
25 fn main() {
26 App::new()
27 .add_plugins((DefaultPlugins, FeathersPlugins))
28 // To make the app available for integration testing, we add these
29 // remote plugins to expose API’s for a testing framework to call.
30 .add_plugins(RemotePlugin::default())
31 .add_plugins(RemoteHttpPlugin::default())
32 .insert_resource(UiTheme(create_dark_theme()))
33 .insert_resource(SeededRng(ChaCha8Rng::seed_from_u64(19878367467712)))
34 .add_systems(Startup, setup)
35 .add_systems(
36 Update,
37 (
38 move_button.run_if(on_timer(std::time::Duration::from_secs(5))),
39 log_button_position,
40 ),
41 )
42 .run();
43 }
44
45 #[derive(Resource)]
46 struct SeededRng(ChaCha8Rng);
47
48 fn on_button_click(_click: On<PointerClick>, mut exit: MessageWriter<AppExit>) {
49 info!("Button pressed!");
50 exit.write(AppExit::Success);
51 }
52
53 fn log_button_position(
54 transform: Single<&UiGlobalTransform, (With<FeathersButton>, Changed<UiGlobalTransform>)>,
55 ) {
56 info!(
57 "Button at physical ({}, {})",
58 transform.translation.x, transform.translation.y
59 );
60 }
61
62 fn random_position(rng: &mut ChaCha8Rng) -> (f32, f32) {
63 let left_pct = rng.random_range(0.0..=60.0);
64 let top_pct = rng.random_range(0.0..=60.0);
65 (left_pct, top_pct)
66 }
67
68 fn move_button(
69 mut rng: ResMut<SeededRng>,
70 mut button_query: Query<&mut Node, With<FeathersButton>>,
71 ) {
72 let (left_pct, top_pct) = random_position(&mut rng.0);
73 for mut node in &mut button_query {
74 node.left = percent(left_pct);
75 node.top = percent(top_pct);
76 }
77 }
78
79 fn setup(mut commands: Commands, mut rng: ResMut<SeededRng>) {
80 let (left_pct, top_pct) = random_position(&mut rng.0);
81 commands.spawn(Camera2d);
82 commands.spawn_scene(bsn! {
83 Node {
84 width: percent(100),
85 height: percent(100),
86 }
87 Children [
88 @FeathersButton {
89 @caption: bsn! { @caption("Button") }
90 }
91 Node {
92 width: px(150),
93 height: px(65),
94 border: UiRect::all(px(5)),
95 left: percent(left_pct),
96 top: percent(top_pct),
97 }
98 BorderColor::all(Color::WHITE)
99 on(on_button_click)
100 ]
101 });
102 }