Struct ButtonInput 

pub struct ButtonInput<T>
where
    T: Clone + Eq + Hash + Send + Sync + 'static,
{ /* private fields */ }

A “press-able” input of type T.

Usage

This type can be used as a resource to keep the current state of an input, by reacting to events from the input. For a given input value:

• ButtonInput::pressed will return true between a press and a release event.
• ButtonInput::just_pressed will return true for one frame after a press event.
• ButtonInput::just_released will return true for one frame after a release event.

Multiple systems

In case multiple systems are checking for ButtonInput::just_pressed or ButtonInput::just_released but only one should react, for example when modifying a Resource, you should consider clearing the input state, either by:

• Using ButtonInput::clear_just_pressed or ButtonInput::clear_just_released instead.
• Calling ButtonInput::clear or ButtonInput::reset immediately after the state change.

Performance

For all operations, the following conventions are used:

• n is the number of stored inputs.
• m is the number of input arguments passed to the method.
• *-suffix denotes an amortized cost.
• ~-suffix denotes an expected cost.

See Rust’s std::collections doc on performance for more details on the conventions used here.

ButtonInput operations	Computational complexity
ButtonInput::any_just_pressed	O(m)~
ButtonInput::any_just_released	O(m)~
ButtonInput::any_pressed	O(m)~
ButtonInput::get_just_pressed	O(n)
ButtonInput::get_just_released	O(n)
ButtonInput::get_pressed	O(n)
ButtonInput::just_pressed	O(1)~
ButtonInput::just_released	O(1)~
ButtonInput::pressed	O(1)~
ButtonInput::press	O(1)~*
ButtonInput::release	O(1)~*
ButtonInput::release_all	O(n)~*
ButtonInput::clear_just_pressed	O(1)~
ButtonInput::clear_just_released	O(1)~
ButtonInput::reset_all	O(n)
ButtonInput::clear	O(n)

Window focus

ButtonInput<KeyCode> is tied to window focus. For example, if the user holds a button while the window loses focus, ButtonInput::just_released will be triggered. Similarly if the window regains focus, ButtonInput::just_pressed will be triggered.

ButtonInput<GamepadButton> is independent of window focus.

Examples

Reading and checking against the current set of pressed buttons:

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(
            Update,
            print_mouse.run_if(resource_changed::<ButtonInput<MouseButton>>),
        )
        .add_systems(
            Update,
            print_keyboard.run_if(resource_changed::<ButtonInput<KeyCode>>),
        )
        .run();
}

fn print_mouse(mouse: Res<ButtonInput<MouseButton>>) {
    println!("Mouse: {:?}", mouse.get_pressed().collect::<Vec<_>>());
}

fn print_keyboard(keyboard: Res<ButtonInput<KeyCode>>) {
    if keyboard.any_pressed([KeyCode::ControlLeft, KeyCode::ControlRight])
        && keyboard.any_pressed([KeyCode::AltLeft, KeyCode::AltRight])
        && keyboard.any_pressed([KeyCode::ShiftLeft, KeyCode::ShiftRight])
        && keyboard.any_pressed([KeyCode::SuperLeft, KeyCode::SuperRight])
        && keyboard.pressed(KeyCode::KeyL)
    {
        println!("On Windows this opens LinkedIn.");
    } else {
        println!("keyboard: {:?}", keyboard.get_pressed().collect::<Vec<_>>());
    }
}

Note

When adding this resource for a new input type, you should:

• Call the ButtonInput::press method for each press event.
• Call the ButtonInput::release method for each release event.
• Call the ButtonInput::clear method at each frame start, before processing events.

Note: Calling clear from a ResMut will trigger change detection. It may be preferable to use DetectChangesMut::bypass_change_detection to avoid causing the resource to always be marked as changed.

Implementations

impl<T> ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static,

pub fn press(&mut self, input: T)

Registers a press for the given input.

pub fn pressed(&self, input: T) -> bool

Returns true if the input has been pressed.

Examples found in repository

examples/ecs/generic_system.rs (line 78)

fn transition_to_in_game_system(
    mut next_state: ResMut<NextState<AppState>>,
    keyboard_input: Res<ButtonInput<KeyCode>>,
) {
    if keyboard_input.pressed(KeyCode::Space) {
        next_state.set(AppState::InGame);
    }
}

examples/ecs/component_hooks.rs (line 142)

fn trigger_hooks(
    mut commands: Commands,
    keys: Res<ButtonInput<KeyCode>>,
    index: Res<MyComponentIndex>,
) {
    for (key, entity) in index.iter() {
        if !keys.pressed(*key) {
            commands.entity(*entity).remove::<MyComponent>();
        }
    }
    for key in keys.get_just_pressed() {
        commands.spawn(MyComponent(*key));
    }
}

examples/input/mouse_input.rs (line 17)

fn mouse_click_system(mouse_button_input: Res<ButtonInput<MouseButton>>) {
    if mouse_button_input.pressed(MouseButton::Left) {
        info!("left mouse currently pressed");
    }

    if mouse_button_input.just_pressed(MouseButton::Left) {
        info!("left mouse just pressed");
    }

    if mouse_button_input.just_released(MouseButton::Left) {
        info!("left mouse just released");
    }
}

examples/3d/color_grading.rs (line 594)

fn adjust_color_grading_option(
    mut color_grading: Single<&mut ColorGrading>,
    input: Res<ButtonInput<KeyCode>>,
    currently_selected_option: Res<SelectedColorGradingOption>,
) {
    let mut delta = 0.0;
    if input.pressed(KeyCode::ArrowLeft) {
        delta -= OPTION_ADJUSTMENT_SPEED;
    }
    if input.pressed(KeyCode::ArrowRight) {
        delta += OPTION_ADJUSTMENT_SPEED;
    }

    if delta != 0.0 {
        let new_value = currently_selected_option.get(color_grading.as_ref()) + delta;
        currently_selected_option.set(&mut color_grading, new_value);
    }
}

examples/3d/post_processing.rs (line 154)

fn handle_keyboard_input(mut app_settings: ResMut<AppSettings>, input: Res<ButtonInput<KeyCode>>) {
    let mut delta = 0.0;
    if input.pressed(KeyCode::ArrowLeft) {
        delta -= CHROMATIC_ABERRATION_INTENSITY_ADJUSTMENT_SPEED;
    } else if input.pressed(KeyCode::ArrowRight) {
        delta += CHROMATIC_ABERRATION_INTENSITY_ADJUSTMENT_SPEED;
    }

    // If no arrow key was pressed, just bail out.
    if delta == 0.0 {
        return;
    }

    app_settings.chromatic_aberration_intensity = (app_settings.chromatic_aberration_intensity
        + delta)
        .clamp(0.0, MAX_CHROMATIC_ABERRATION_INTENSITY);
}

examples/audio/spatial_audio_2d.rs (line 113)

fn update_listener(
    keyboard: Res<ButtonInput<KeyCode>>,
    time: Res<Time>,
    mut listener: Single<&mut Transform, With<SpatialListener>>,
) {
    let speed = 200.;

    if keyboard.pressed(KeyCode::ArrowRight) {
        listener.translation.x += speed * time.delta_secs();
    }
    if keyboard.pressed(KeyCode::ArrowLeft) {
        listener.translation.x -= speed * time.delta_secs();
    }
    if keyboard.pressed(KeyCode::ArrowUp) {
        listener.translation.y += speed * time.delta_secs();
    }
    if keyboard.pressed(KeyCode::ArrowDown) {
        listener.translation.y -= speed * time.delta_secs();
    }
}

Additional examples can be found in:

• examples/audio/spatial_audio_3d.rs
• examples/3d/lighting.rs
• examples/camera/first_person_view_model.rs
• examples/state/custom_transitions.rs
• examples/state/states.rs
• examples/state/sub_states.rs
• examples/camera/2d_top_down_camera.rs
• examples/3d/depth_of_field.rs
• examples/ui/ui_transform.rs
• examples/games/breakout.rs
• examples/state/computed_states.rs
• examples/3d/reflection_probes.rs
• examples/3d/spotlight.rs
• examples/3d/volumetric_fog.rs
• examples/input/keyboard_input.rs
• examples/3d/generate_custom_mesh.rs
• examples/3d/irradiance_volumes.rs
• examples/stress_tests/bevymark.rs
• examples/3d/mixed_lighting.rs
• examples/testbed/full_ui.rs
• examples/gizmos/light_gizmos.rs
• examples/3d/ssr.rs
• examples/2d/rotation.rs
• examples/shader_advanced/render_depth_to_texture.rs
• examples/3d/visibility_range.rs
• examples/3d/tonemapping.rs
• examples/3d/auto_exposure.rs
• examples/camera/camera_orbit.rs
• examples/movement/physics_in_fixed_timestep.rs
• examples/3d/clustered_decals.rs
• examples/games/alien_cake_addict.rs
• examples/3d/light_textures.rs
• examples/gizmos/2d_gizmos.rs
• examples/3d/blend_modes.rs
• examples/2d/2d_viewport_to_world.rs
• examples/gizmos/3d_gizmos.rs
• examples/3d/../helpers/camera_controller.rs
• examples/3d/bloom_3d.rs
• examples/3d/fog.rs
• examples/2d/bloom_2d.rs
• examples/3d/transmission.rs

pub fn any_pressed(&self, inputs: impl IntoIterator<Item = T>) -> bool

Returns true if any item in inputs has been pressed.

Examples found in repository

examples/input/keyboard_modifiers.rs (line 14)

fn keyboard_input_system(input: Res<ButtonInput<KeyCode>>) {
    let shift = input.any_pressed([KeyCode::ShiftLeft, KeyCode::ShiftRight]);
    let ctrl = input.any_pressed([KeyCode::ControlLeft, KeyCode::ControlRight]);

    if ctrl && shift && input.just_pressed(KeyCode::KeyA) {
        info!("Just pressed Ctrl + Shift + A!");
    }
}

examples/ui/scroll.rs (line 38)

fn send_scroll_events(
    mut mouse_wheel_reader: MessageReader<MouseWheel>,
    hover_map: Res<HoverMap>,
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut commands: Commands,
) {
    for mouse_wheel in mouse_wheel_reader.read() {
        let mut delta = -Vec2::new(mouse_wheel.x, mouse_wheel.y);

        if mouse_wheel.unit == MouseScrollUnit::Line {
            delta *= LINE_HEIGHT;
        }

        if keyboard_input.any_pressed([KeyCode::ControlLeft, KeyCode::ControlRight]) {
            std::mem::swap(&mut delta.x, &mut delta.y);
        }

        for pointer_map in hover_map.values() {
            for entity in pointer_map.keys().copied() {
                commands.trigger(Scroll { entity, delta });
            }
        }
    }
}

examples/3d/fog.rs (line 253)

fn update_system(
    camera: Single<(&mut DistanceFog, &mut Transform)>,
    mut text: Single<&mut Text>,
    time: Res<Time>,
    keycode: Res<ButtonInput<KeyCode>>,
) {
    let now = time.elapsed_secs();
    let delta = time.delta_secs();

    let (mut fog, mut transform) = camera.into_inner();

    // Orbit camera around pyramid
    let orbit_scale = 8.0 + ops::sin(now / 10.0) * 7.0;
    *transform = Transform::from_xyz(
        ops::cos(now / 5.0) * orbit_scale,
        12.0 - orbit_scale / 2.0,
        ops::sin(now / 5.0) * orbit_scale,
    )
    .looking_at(Vec3::ZERO, Vec3::Y);

    // Fog Information
    text.0 = format!("Fog Falloff: {:?}\nFog Color: {:?}", fog.falloff, fog.color);

    // Fog Falloff Mode Switching
    text.push_str("\n\n1 / 2 / 3 - Fog Falloff Mode");

    if keycode.pressed(KeyCode::Digit1) {
        if let FogFalloff::Linear { .. } = fog.falloff {
            // No change
        } else {
            fog.falloff = FogFalloff::Linear {
                start: 5.0,
                end: 20.0,
            };
        };
    }

    if keycode.pressed(KeyCode::Digit2) {
        if let FogFalloff::Exponential { .. } = fog.falloff {
            // No change
        } else if let FogFalloff::ExponentialSquared { density } = fog.falloff {
            fog.falloff = FogFalloff::Exponential { density };
        } else {
            fog.falloff = FogFalloff::Exponential { density: 0.07 };
        };
    }

    if keycode.pressed(KeyCode::Digit3) {
        if let FogFalloff::Exponential { density } = fog.falloff {
            fog.falloff = FogFalloff::ExponentialSquared { density };
        } else if let FogFalloff::ExponentialSquared { .. } = fog.falloff {
            // No change
        } else {
            fog.falloff = FogFalloff::ExponentialSquared { density: 0.07 };
        };
    }

    // Linear Fog Controls
    if let FogFalloff::Linear { start, end } = &mut fog.falloff {
        text.push_str("\nA / S - Move Start Distance\nZ / X - Move End Distance");

        if keycode.pressed(KeyCode::KeyA) {
            *start -= delta * 3.0;
        }
        if keycode.pressed(KeyCode::KeyS) {
            *start += delta * 3.0;
        }
        if keycode.pressed(KeyCode::KeyZ) {
            *end -= delta * 3.0;
        }
        if keycode.pressed(KeyCode::KeyX) {
            *end += delta * 3.0;
        }
    }

    // Exponential Fog Controls
    if let FogFalloff::Exponential { density } = &mut fog.falloff {
        text.push_str("\nA / S - Change Density");

        if keycode.pressed(KeyCode::KeyA) {
            *density -= delta * 0.5 * *density;
            if *density < 0.0 {
                *density = 0.0;
            }
        }
        if keycode.pressed(KeyCode::KeyS) {
            *density += delta * 0.5 * *density;
        }
    }

    // ExponentialSquared Fog Controls
    if let FogFalloff::ExponentialSquared { density } = &mut fog.falloff {
        text.push_str("\nA / S - Change Density");

        if keycode.pressed(KeyCode::KeyA) {
            *density -= delta * 0.5 * *density;
            if *density < 0.0 {
                *density = 0.0;
            }
        }
        if keycode.pressed(KeyCode::KeyS) {
            *density += delta * 0.5 * *density;
        }
    }

    // RGBA Controls
    text.push_str("\n\n- / = - Red\n[ / ] - Green\n; / ' - Blue\n. / ? - Alpha");

    // We're performing various operations in the sRGB color space,
    // so we convert the fog color to sRGB here, then modify it,
    // and finally when we're done we can convert it back and set it.
    let mut fog_color = Srgba::from(fog.color);
    if keycode.pressed(KeyCode::Minus) {
        fog_color.red = (fog_color.red - 0.1 * delta).max(0.0);
    }

    if keycode.any_pressed([KeyCode::Equal, KeyCode::NumpadEqual]) {
        fog_color.red = (fog_color.red + 0.1 * delta).min(1.0);
    }

    if keycode.pressed(KeyCode::BracketLeft) {
        fog_color.green = (fog_color.green - 0.1 * delta).max(0.0);
    }

    if keycode.pressed(KeyCode::BracketRight) {
        fog_color.green = (fog_color.green + 0.1 * delta).min(1.0);
    }

    if keycode.pressed(KeyCode::Semicolon) {
        fog_color.blue = (fog_color.blue - 0.1 * delta).max(0.0);
    }

    if keycode.pressed(KeyCode::Quote) {
        fog_color.blue = (fog_color.blue + 0.1 * delta).min(1.0);
    }

    if keycode.pressed(KeyCode::Period) {
        fog_color.alpha = (fog_color.alpha - 0.1 * delta).max(0.0);
    }

    if keycode.pressed(KeyCode::Slash) {
        fog_color.alpha = (fog_color.alpha + 0.1 * delta).min(1.0);
    }

    fog.color = Color::from(fog_color);
}

pub fn all_pressed(&self, inputs: impl IntoIterator<Item = T>) -> bool

Returns true if all items in inputs have been pressed.

pub fn release(&mut self, input: T)

Registers a release for the given input.

pub fn release_all(&mut self)

Registers a release for all currently pressed inputs.

pub fn just_pressed(&self, input: T) -> bool

Returns true if the input has been pressed during the current frame.

Note: This function does not imply information regarding the current state of ButtonInput::pressed or ButtonInput::just_released.

Examples found in repository

examples/app/logs.rs (line 34)

fn panic_on_p(keys: Res<ButtonInput<KeyCode>>) {
    if keys.just_pressed(KeyCode::KeyP) {
        panic!("P pressed, panicking");
    }
}

examples/window/clear_color.rs (line 21)

fn change_clear_color(input: Res<ButtonInput<KeyCode>>, mut clear_color: ResMut<ClearColor>) {
    if input.just_pressed(KeyCode::Space) {
        clear_color.0 = PURPLE.into();
    }
}

examples/games/alien_cake_addict.rs (line 385)

fn game_over_keyboard(
    mut next_state: ResMut<NextState<GameState>>,
    keyboard_input: Res<ButtonInput<KeyCode>>,
) {
    if keyboard_input.just_pressed(KeyCode::Space) {
        next_state.set(GameState::Playing);
    }
}

examples/3d/3d_shapes.rs (line 200)

fn toggle_wireframe(
    mut wireframe_config: ResMut<WireframeConfig>,
    keyboard: Res<ButtonInput<KeyCode>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        wireframe_config.global = !wireframe_config.global;
    }
}

examples/2d/2d_shapes.rs (line 102)

fn toggle_wireframe(
    mut wireframe_config: ResMut<Wireframe2dConfig>,
    keyboard: Res<ButtonInput<KeyCode>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        wireframe_config.global = !wireframe_config.global;
    }
}

examples/ui/window_fallthrough.rs (line 51)

fn toggle_mouse_passthrough(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut cursor_options: Single<&mut CursorOptions>,
) {
    if keyboard_input.just_pressed(KeyCode::KeyP) {
        cursor_options.hit_test = !cursor_options.hit_test;
    }
}

Additional examples can be found in:

• examples/3d/solari.rs
• examples/testbed/2d.rs
• examples/testbed/3d.rs
• examples/testbed/ui.rs
• examples/audio/audio_control.rs
• examples/window/scale_factor_override.rs
• examples/input/keyboard_modifiers.rs
• examples/ui/ui_texture_atlas.rs
• examples/window/monitor_info.rs
• examples/state/sub_states.rs
• examples/window/screenshot.rs
• examples/stress_tests/many_gizmos.rs
• examples/3d/atmospheric_fog.rs
• examples/window/window_settings.rs
• examples/3d/depth_of_field.rs
• examples/state/computed_states.rs
• examples/input/mouse_input.rs
• examples/state/custom_transitions.rs
• examples/ecs/one_shot_systems.rs
• examples/ecs/run_conditions.rs
• examples/input/text_input.rs
• examples/input/mouse_grab.rs
• examples/math/bounding_2d.rs
• examples/audio/pitch.rs
• examples/ecs/entity_disabling.rs
• examples/ui/ui_scaling.rs
• examples/window/window_resizing.rs
• examples/ui/overflow_debug.rs
• examples/window/low_power.rs
• examples/shader/shader_material_wesl.rs
• examples/ecs/observers.rs
• examples/window/custom_user_event.rs
• examples/ui/standard_widgets_observers.rs
• examples/games/loading_screen.rs
• examples/audio/spatial_audio_2d.rs
• examples/ui/standard_widgets.rs
• examples/3d/tonemapping.rs
• examples/3d/shadow_caster_receiver.rs
• examples/audio/spatial_audio_3d.rs
• examples/dev_tools/fps_overlay.rs
• examples/camera/projection_zoom.rs
• examples/games/stepping.rs
• examples/math/cubic_splines.rs
• examples/3d/clearcoat.rs
• examples/3d/shadow_biases.rs
• examples/3d/occlusion_culling.rs
• examples/window/custom_cursor_image.rs
• examples/3d/order_independent_transparency.rs
• examples/window/window_drag_move.rs
• examples/3d/irradiance_volumes.rs
• examples/transforms/align.rs
• examples/testbed/full_ui.rs
• examples/input/keyboard_input.rs
• examples/shader/shader_prepass.rs
• examples/ui/directional_navigation.rs
• examples/3d/generate_custom_mesh.rs
• examples/3d/parallax_mapping.rs
• examples/ecs/fallible_params.rs
• examples/3d/motion_blur.rs
• examples/3d/wireframe.rs
• examples/2d/wireframe_2d.rs
• examples/3d/lighting.rs
• examples/gizmos/light_gizmos.rs
• examples/3d/specular_tint.rs
• examples/3d/visibility_range.rs
• examples/3d/volumetric_fog.rs
• examples/stress_tests/many_foxes.rs
• examples/3d/auto_exposure.rs
• examples/diagnostics/log_diagnostics.rs
• examples/3d/ssr.rs
• examples/3d/reflection_probes.rs
• examples/gizmos/2d_gizmos.rs
• examples/3d/blend_modes.rs
• examples/math/random_sampling.rs
• examples/3d/anisotropy.rs
• examples/3d/deferred_rendering.rs
• examples/math/sampling_primitives.rs
• examples/animation/animated_mesh_control.rs
• examples/gizmos/3d_gizmos.rs
• examples/3d/ssao.rs
• examples/3d/../helpers/camera_controller.rs
• examples/3d/bloom_3d.rs
• examples/2d/bloom_2d.rs
• examples/3d/anti_aliasing.rs
• examples/3d/transmission.rs

pub fn any_just_pressed(&self, inputs: impl IntoIterator<Item = T>) -> bool

Returns true if any item in inputs has been pressed during the current frame.

pub fn clear_just_pressed(&mut self, input: T) -> bool

Clears the just_pressed state of the input and returns true if the input has just been pressed.

Future calls to ButtonInput::just_pressed for the given input will return false until a new press event occurs.

pub fn just_released(&self, input: T) -> bool

Returns true if the input has been released during the current frame.

Note: This function does not imply information regarding the current state of ButtonInput::pressed or ButtonInput::just_pressed.

Examples found in repository

examples/input/mouse_input.rs (line 25)

fn mouse_click_system(mouse_button_input: Res<ButtonInput<MouseButton>>) {
    if mouse_button_input.pressed(MouseButton::Left) {
        info!("left mouse currently pressed");
    }

    if mouse_button_input.just_pressed(MouseButton::Left) {
        info!("left mouse just pressed");
    }

    if mouse_button_input.just_released(MouseButton::Left) {
        info!("left mouse just released");
    }
}

examples/dev_tools/fps_overlay.rs (line 92)

fn customize_config(input: Res<ButtonInput<KeyCode>>, mut overlay: ResMut<FpsOverlayConfig>) {
    if input.just_pressed(KeyCode::Digit1) {
        // Changing resource will affect overlay
        if overlay.text_color == OverlayColor::GREEN {
            overlay.text_color = OverlayColor::RED;
        } else {
            overlay.text_color = OverlayColor::GREEN;
        }
    }
    if input.just_pressed(KeyCode::Digit2) {
        overlay.text_config.font_size -= 2.0;
    }
    if input.just_pressed(KeyCode::Digit3) {
        overlay.text_config.font_size += 2.0;
    }
    if input.just_pressed(KeyCode::Digit4) {
        overlay.enabled = !overlay.enabled;
    }
    if input.just_released(KeyCode::Digit5) {
        overlay.frame_time_graph_config.enabled = !overlay.frame_time_graph_config.enabled;
    }
}

examples/input/keyboard_input.rs (line 26)

fn keyboard_input_system(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    key_input: Res<ButtonInput<Key>>,
) {
    // KeyCode is used when you want the key location across different keyboard layouts
    // See https://w3c.github.io/uievents-code/#code-value-tables for the locations
    if keyboard_input.pressed(KeyCode::KeyA) {
        info!("'A' currently pressed");
    }

    if keyboard_input.just_pressed(KeyCode::KeyA) {
        info!("'A' just pressed");
    }
    if keyboard_input.just_released(KeyCode::KeyA) {
        info!("'A' just released");
    }

    // Key is used when you want a specific key, no matter where it is located.
    // This is useful for symbols that have a specific connotation, e.g. '?' for
    // a help menu or '+'/'-' for zoom
    let key = Key::Character("?".into());
    if key_input.pressed(key.clone()) {
        info!("'?' currently pressed");
    }
    if key_input.just_pressed(key.clone()) {
        info!("'?' just pressed");
    }
    if key_input.just_released(key) {
        info!("'?' just released");
    }
}

examples/stress_tests/bevymark.rs (line 341)

fn mouse_handler(
    mut commands: Commands,
    args: Res<Args>,
    time: Res<Time>,
    mouse_button_input: Res<ButtonInput<MouseButton>>,
    window: Query<&Window>,
    bird_resources: ResMut<BirdResources>,
    mut counter: ResMut<BevyCounter>,
    mut rng: Local<Option<ChaCha8Rng>>,
    mut wave: Local<usize>,
) {
    let Ok(window) = window.single() else {
        return;
    };

    if rng.is_none() {
        // We're seeding the PRNG here to make this example deterministic for testing purposes.
        // This isn't strictly required in practical use unless you need your app to be deterministic.
        *rng = Some(ChaCha8Rng::seed_from_u64(42));
    }
    let rng = rng.as_mut().unwrap();

    if mouse_button_input.just_released(MouseButton::Left) {
        counter.color = Color::linear_rgb(rng.random(), rng.random(), rng.random());
    }

    if mouse_button_input.pressed(MouseButton::Left) {
        let spawn_count = (BIRDS_PER_SECOND as f64 * time.delta_secs_f64()) as usize;
        spawn_birds(
            &mut commands,
            args.into_inner(),
            &window.resolution,
            &mut counter,
            spawn_count,
            bird_resources.into_inner(),
            None,
            *wave,
        );
        *wave += 1;
    }
}

examples/3d/../helpers/camera_controller.rs (line 195)

fn run_camera_controller(
    time: Res<Time<Real>>,
    mut windows: Query<(&Window, &mut CursorOptions)>,
    accumulated_mouse_motion: Res<AccumulatedMouseMotion>,
    accumulated_mouse_scroll: Res<AccumulatedMouseScroll>,
    mouse_button_input: Res<ButtonInput<MouseButton>>,
    key_input: Res<ButtonInput<KeyCode>>,
    mut toggle_cursor_grab: Local<bool>,
    mut mouse_cursor_grab: Local<bool>,
    mut query: Query<(&mut Transform, &mut CameraController), With<Camera>>,
) {
    let dt = time.delta_secs();

    let Ok((mut transform, mut controller)) = query.single_mut() else {
        return;
    };

    if !controller.initialized {
        let (yaw, pitch, _roll) = transform.rotation.to_euler(EulerRot::YXZ);
        controller.yaw = yaw;
        controller.pitch = pitch;
        controller.initialized = true;
        info!("{}", *controller);
    }
    if !controller.enabled {
        return;
    }

    let mut scroll = 0.0;

    let amount = match accumulated_mouse_scroll.unit {
        MouseScrollUnit::Line => accumulated_mouse_scroll.delta.y,
        MouseScrollUnit::Pixel => accumulated_mouse_scroll.delta.y / 16.0,
    };
    scroll += amount;
    controller.walk_speed += scroll * controller.scroll_factor * controller.walk_speed;
    controller.run_speed = controller.walk_speed * 3.0;

    // Handle key input
    let mut axis_input = Vec3::ZERO;
    if key_input.pressed(controller.key_forward) {
        axis_input.z += 1.0;
    }
    if key_input.pressed(controller.key_back) {
        axis_input.z -= 1.0;
    }
    if key_input.pressed(controller.key_right) {
        axis_input.x += 1.0;
    }
    if key_input.pressed(controller.key_left) {
        axis_input.x -= 1.0;
    }
    if key_input.pressed(controller.key_up) {
        axis_input.y += 1.0;
    }
    if key_input.pressed(controller.key_down) {
        axis_input.y -= 1.0;
    }

    let mut cursor_grab_change = false;
    if key_input.just_pressed(controller.keyboard_key_toggle_cursor_grab) {
        *toggle_cursor_grab = !*toggle_cursor_grab;
        cursor_grab_change = true;
    }
    if mouse_button_input.just_pressed(controller.mouse_key_cursor_grab) {
        *mouse_cursor_grab = true;
        cursor_grab_change = true;
    }
    if mouse_button_input.just_released(controller.mouse_key_cursor_grab) {
        *mouse_cursor_grab = false;
        cursor_grab_change = true;
    }
    let cursor_grab = *mouse_cursor_grab || *toggle_cursor_grab;

    // Update velocity
    if axis_input != Vec3::ZERO {
        let max_speed = if key_input.pressed(controller.key_run) {
            controller.run_speed
        } else {
            controller.walk_speed
        };
        controller.velocity = axis_input.normalize() * max_speed;
    } else {
        let friction = controller.friction.clamp(0.0, 1.0);
        controller.velocity *= 1.0 - friction;
        if controller.velocity.length_squared() < 1e-6 {
            controller.velocity = Vec3::ZERO;
        }
    }

    // Apply movement update
    if controller.velocity != Vec3::ZERO {
        let forward = *transform.forward();
        let right = *transform.right();
        transform.translation += controller.velocity.x * dt * right
            + controller.velocity.y * dt * Vec3::Y
            + controller.velocity.z * dt * forward;
    }

    // Handle cursor grab
    if cursor_grab_change {
        if cursor_grab {
            for (window, mut cursor_options) in &mut windows {
                if !window.focused {
                    continue;
                }

                cursor_options.grab_mode = CursorGrabMode::Locked;
                cursor_options.visible = false;
            }
        } else {
            for (_, mut cursor_options) in &mut windows {
                cursor_options.grab_mode = CursorGrabMode::None;
                cursor_options.visible = true;
            }
        }
    }

    // Handle mouse input
    if accumulated_mouse_motion.delta != Vec2::ZERO && cursor_grab {
        // Apply look update
        controller.pitch = (controller.pitch
            - accumulated_mouse_motion.delta.y * RADIANS_PER_DOT * controller.sensitivity)
            .clamp(-PI / 2., PI / 2.);
        controller.yaw -=
            accumulated_mouse_motion.delta.x * RADIANS_PER_DOT * controller.sensitivity;
        transform.rotation = Quat::from_euler(EulerRot::ZYX, 0.0, controller.yaw, controller.pitch);
    }
}

pub fn any_just_released(&self, inputs: impl IntoIterator<Item = T>) -> bool

Returns true if any item in inputs has just been released.

pub fn all_just_released(&self, inputs: impl IntoIterator<Item = T>) -> bool

Returns true if all items in inputs have just been released.

pub fn all_just_pressed(&self, inputs: impl IntoIterator<Item = T>) -> bool

Returns true if all items in inputs have been just pressed.

pub fn clear_just_released(&mut self, input: T) -> bool

Clears the just_released state of the input and returns true if the input has just been released.

Future calls to ButtonInput::just_released for the given input will return false until a new release event occurs.

pub fn reset(&mut self, input: T)

Clears the pressed, just_pressed and just_released data of the input.

pub fn reset_all(&mut self)

Clears the pressed, just_pressed, and just_released data for every input.

See also ButtonInput::clear for simulating elapsed time steps.

pub fn clear(&mut self)

Clears the just pressed and just released data for every input.

See also ButtonInput::reset_all for a full reset.

pub fn get_pressed(&self) -> impl ExactSizeIterator

An iterator visiting every pressed input in arbitrary order.

pub fn get_just_pressed(&self) -> impl ExactSizeIterator

An iterator visiting every just pressed input in arbitrary order.

Note: Returned elements do not imply information regarding the current state of ButtonInput::pressed or ButtonInput::just_released.

Examples found in repository

examples/ecs/component_hooks.rs (line 146)

fn trigger_hooks(
    mut commands: Commands,
    keys: Res<ButtonInput<KeyCode>>,
    index: Res<MyComponentIndex>,
) {
    for (key, entity) in index.iter() {
        if !keys.pressed(*key) {
            commands.entity(*entity).remove::<MyComponent>();
        }
    }
    for key in keys.get_just_pressed() {
        commands.spawn(MyComponent(*key));
    }
}

pub fn get_just_released(&self) -> impl ExactSizeIterator

An iterator visiting every just released input in arbitrary order.

Note: Returned elements do not imply information regarding the current state of ButtonInput::pressed or ButtonInput::just_pressed.

Trait Implementations

impl<T> Clone for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static,

fn clone(&self) -> ButtonInput<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for ButtonInput<T>

where T: Debug + Clone + Eq + Hash + Send + Sync + 'static,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Default for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static,

fn default() -> ButtonInput<T>

Returns the “default value” for a type.

impl<T> FromArg for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

type This<'from_arg> = ButtonInput<T>

The type to convert into.

fn from_arg( arg: Arg<'_>, ) -> Result<<ButtonInput<T> as FromArg>::This<'_>, ArgError>

Creates an item from an argument.

impl<T> FromReflect for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn from_reflect( reflect: &(dyn PartialReflect + 'static), ) -> Option<ButtonInput<T>>

Constructs a concrete instance of Self from a reflected value.

fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails.

impl<T> GetOwnership for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn ownership() -> Ownership

Returns the ownership of Self.

impl<T> GetTypeRegistration for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.

fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type.

impl<T> IntoReturn for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn into_return<'into_return>(self) -> Return<'into_return>

where ButtonInput<T>: 'into_return,

Converts Self into a Return value.

impl<T> PartialReflect for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value.

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

fn reflect_owned(self: Box<ButtonInput<T>>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

fn try_into_reflect( self: Box<ButtonInput<T>>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.

fn into_partial_reflect(self: Box<ButtonInput<T>>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value.

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value.

fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result.

fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>

Attempts to clone Self using reflection.

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

fn to_dynamic(&self) -> Box<dyn PartialReflect>

Converts this reflected value into its dynamic representation based on its kind.

fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>

where T: 'static, Self: Sized + TypePath,

For a type implementing PartialReflect, combines reflect_clone and take in a useful fashion, automatically constructing an appropriate ReflectCloneError if the downcast fails.

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Debug formatter for the value.

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl<T> Reflect for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn into_any(self: Box<ButtonInput<T>>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.

fn into_reflect(self: Box<ButtonInput<T>>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.

fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a fully-reflected value.

fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable, fully-reflected value.

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value.

impl<T> Struct for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn field(&self, name: &str) -> Option<&(dyn PartialReflect + 'static)>

Returns a reference to the value of the field named name as a &dyn PartialReflect.

fn field_mut( &mut self, name: &str, ) -> Option<&mut (dyn PartialReflect + 'static)>

Returns a mutable reference to the value of the field named name as a &mut dyn PartialReflect.

fn field_at(&self, index: usize) -> Option<&(dyn PartialReflect + 'static)>

Returns a reference to the value of the field with index index as a &dyn PartialReflect.

fn field_at_mut( &mut self, index: usize, ) -> Option<&mut (dyn PartialReflect + 'static)>

Returns a mutable reference to the value of the field with index index as a &mut dyn PartialReflect.

fn name_at(&self, index: usize) -> Option<&str>

Returns the name of the field with index index.

fn field_len(&self) -> usize

Returns the number of fields in the struct.

fn iter_fields(&self) -> FieldIter<'_>

Returns an iterator over the values of the reflectable fields for this struct.

fn to_dynamic_struct(&self) -> DynamicStruct

Creates a new DynamicStruct from this struct.

fn get_represented_struct_info(&self) -> Option<&'static StructInfo>

Will return None if TypeInfo is not available.

impl<T> TypePath for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync,

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type.

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type.

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous.

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous.

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous.

impl<T> Typed for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + MaybeTyped + RegisterForReflection,

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl<T> Resource for ButtonInput<T>

where T: Clone + Eq + Hash + Send + Sync + 'static, ButtonInput<T>: Send + Sync + 'static,