Struct bevy::input::ButtonInput

pub struct ButtonInput<T>
where
    T: Copy + 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 in the case of triggering State change, 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. Currently this happens even if the focus switches from one Bevy window to another (for example because a new window was just spawned).

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_gamepad.run_if(resource_changed::<ButtonInput<GamepadButton>>),
        )
        .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_gamepad(gamepad: Res<ButtonInput<GamepadButton>>) {
    println!("Gamepad: {:?}", gamepad.get_pressed().collect::<Vec<_>>());
}

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<_>>());
    }
}

Accepting input from multiple devices:

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(
            Update,
            something_used.run_if(
                input_just_pressed(KeyCode::KeyE)
                    .or_else(input_just_pressed(GamepadButton::new(
                        Gamepad::new(0),
                        GamepadButtonType::West,
                    ))),
            ),
        )
        .run();
}

fn something_used() {
    println!("Generic use-ish button pressed.");
}

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: Copy + 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/input/keyboard_input.rs (line 14)

fn keyboard_input_system(keyboard_input: Res<ButtonInput<KeyCode>>) {
    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");
    }
}

examples/ecs/component_hooks.rs (line 102)

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 14)

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/tools/scene_viewer/morph_viewer_plugin.rs (line 173)

    fn active(&self, inputs: &ButtonInput<KeyCode>) -> bool {
        let mut modifier = self.modifiers.iter();
        let mut non_modifier = ALL_MODIFIERS.iter().filter(|m| !self.modifiers.contains(m));

        let key = inputs.pressed(self.key);
        let modifier = modifier.all(|m| inputs.pressed(*m));
        let non_modifier = non_modifier.all(|m| !inputs.pressed(*m));
        key && modifier && non_modifier
    }

examples/3d/lighting.rs (line 332)

fn movement(
    input: Res<ButtonInput<KeyCode>>,
    time: Res<Time>,
    mut query: Query<&mut Transform, With<Movable>>,
) {
    for mut transform in &mut query {
        let mut direction = Vec3::ZERO;
        if input.pressed(KeyCode::ArrowUp) {
            direction.y += 1.0;
        }
        if input.pressed(KeyCode::ArrowDown) {
            direction.y -= 1.0;
        }
        if input.pressed(KeyCode::ArrowLeft) {
            direction.x -= 1.0;
        }
        if input.pressed(KeyCode::ArrowRight) {
            direction.x += 1.0;
        }

        transform.translation += time.delta_seconds() * 2.0 * direction;
    }
}

Additional examples can be found in:

• examples/audio/spatial_audio_3d.rs
• examples/audio/spatial_audio_2d.rs
• examples/ecs/state.rs
• examples/3d/spotlight.rs
• examples/games/breakout.rs
• examples/3d/generate_custom_mesh.rs
• examples/3d/irradiance_volumes.rs
• examples/stress_tests/bevymark.rs
• examples/gizmos/light_gizmos.rs
• examples/2d/rotation.rs
• examples/3d/tonemapping.rs
• examples/games/alien_cake_addict.rs
• examples/gizmos/2d_gizmos.rs
• examples/3d/blend_modes.rs
• examples/gizmos/3d_gizmos.rs
• examples/3d/bloom_3d.rs
• examples/2d/bloom_2d.rs
• examples/tools/scene_viewer/../../helpers/camera_controller.rs
• examples/3d/fog.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/3d/fog.rs (line 270)

fn update_system(
    mut camera: Query<(&mut FogSettings, &mut Transform)>,
    mut text: Query<&mut Text>,
    time: Res<Time>,
    keycode: Res<ButtonInput<KeyCode>>,
) {
    let now = time.elapsed_seconds();
    let delta = time.delta_seconds();

    let (mut fog, mut transform) = camera.single_mut();
    let mut text = text.single_mut();

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

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

    // Fog Falloff Mode Switching
    text.sections[0]
        .value
        .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::Exponential { density: 0.07 };
        };
    }

    // Linear Fog Controls
    if let FogFalloff::Linear {
        ref mut start,
        ref mut end,
    } = &mut fog.falloff
    {
        text.sections[0]
            .value
            .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 { ref mut density } = &mut fog.falloff {
        text.sections[0].value.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 { ref mut density } = &mut fog.falloff {
        text.sections[0].value.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.sections[0]
        .value
        .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 36)

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 393)

fn gameover_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/audio/audio_control.rs (line 36)

fn pause(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    music_controller: Query<&AudioSink, With<MyMusic>>,
) {
    if keyboard_input.just_pressed(KeyCode::Space) {
        if let Ok(sink) = music_controller.get_single() {
            sink.toggle();
        }
    }
}

fn volume(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    music_controller: Query<&AudioSink, With<MyMusic>>,
) {
    if let Ok(sink) = music_controller.get_single() {
        if keyboard_input.just_pressed(KeyCode::Equal) {
            sink.set_volume(sink.volume() + 0.1);
        } else if keyboard_input.just_pressed(KeyCode::Minus) {
            sink.set_volume(sink.volume() - 0.1);
        }
    }
}

examples/ui/window_fallthrough.rs (line 54)

fn toggle_mouse_passthrough(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut windows: Query<&mut Window>,
) {
    if keyboard_input.just_pressed(KeyCode::KeyP) {
        let mut window = windows.single_mut();
        window.cursor.hit_test = !window.cursor.hit_test;
    }
}

examples/ui/ui_texture_atlas.rs (line 84)

fn increment_atlas_index(
    mut atlas_images: Query<&mut TextureAtlas>,
    keyboard: Res<ButtonInput<KeyCode>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        for mut atlas_image in &mut atlas_images {
            atlas_image.index = (atlas_image.index + 1) % 6;
        }
    }
}

Additional examples can be found in:

• examples/input/keyboard_modifiers.rs
• examples/input/keyboard_input.rs
• examples/dev_tools/fps_overlay.rs
• examples/stress_tests/many_gizmos.rs
• examples/window/scale_factor_override.rs
• examples/ui/ui.rs
• examples/input/mouse_input.rs
• examples/window/window_settings.rs
• examples/ecs/run_conditions.rs
• examples/2d/bounding_2d.rs
• examples/window/screenshot.rs
• examples/3d/atmospheric_fog.rs
• examples/window/low_power.rs
• examples/audio/spatial_audio_2d.rs
• examples/audio/pitch.rs
• examples/input/text_input.rs
• examples/input/mouse_grab.rs
• examples/ui/ui_scaling.rs
• examples/audio/spatial_audio_3d.rs
• examples/ui/overflow_debug.rs
• examples/window/window_resizing.rs
• examples/tools/gamepad_viewer.rs
• examples/games/loading_screen.rs
• examples/3d/tonemapping.rs
• examples/3d/shadow_caster_receiver.rs
• examples/tools/scene_viewer/scene_viewer_plugin.rs
• examples/3d/shadow_biases.rs
• examples/games/stepping.rs
• examples/3d/irradiance_volumes.rs
• examples/shader/shader_prepass.rs
• examples/3d/generate_custom_mesh.rs
• examples/3d/parallax_mapping.rs
• examples/input/gamepad_input.rs
• examples/2d/wireframe_2d.rs
• examples/3d/motion_blur.rs
• examples/3d/wireframe.rs
• examples/transforms/align.rs
• examples/3d/lighting.rs
• examples/tools/scene_viewer/animation_plugin.rs
• examples/3d/reflection_probes.rs
• examples/gizmos/light_gizmos.rs
• examples/stress_tests/many_foxes.rs
• examples/gizmos/2d_gizmos.rs
• examples/3d/anti_aliasing.rs
• examples/input/gamepad_rumble.rs
• examples/3d/blend_modes.rs
• examples/3d/ssao.rs
• examples/3d/deferred_rendering.rs
• examples/gizmos/3d_gizmos.rs
• examples/animation/animated_fox.rs
• examples/3d/bloom_3d.rs
• examples/2d/bloom_2d.rs
• examples/tools/scene_viewer/../../helpers/camera_controller.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/keyboard_input.rs (line 21)

fn keyboard_input_system(keyboard_input: Res<ButtonInput<KeyCode>>) {
    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");
    }
}

examples/input/mouse_input.rs (line 22)

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/tools/gamepad_viewer.rs (line 458)

fn update_buttons(
    gamepads: Res<Gamepads>,
    button_inputs: Res<ButtonInput<GamepadButton>>,
    materials: Res<ButtonMaterials>,
    mut query: Query<(&mut Handle<ColorMaterial>, &ReactTo)>,
) {
    for gamepad in gamepads.iter() {
        for (mut handle, react_to) in query.iter_mut() {
            if button_inputs.just_pressed(GamepadButton::new(gamepad, **react_to)) {
                *handle = materials.active.clone();
            }
            if button_inputs.just_released(GamepadButton::new(gamepad, **react_to)) {
                *handle = materials.normal.clone();
            }
        }
    }
}

examples/input/gamepad_input.rs (line 21)

fn gamepad_system(
    gamepads: Res<Gamepads>,
    button_inputs: Res<ButtonInput<GamepadButton>>,
    button_axes: Res<Axis<GamepadButton>>,
    axes: Res<Axis<GamepadAxis>>,
) {
    for gamepad in gamepads.iter() {
        if button_inputs.just_pressed(GamepadButton::new(gamepad, GamepadButtonType::South)) {
            info!("{:?} just pressed South", gamepad);
        } else if button_inputs.just_released(GamepadButton::new(gamepad, GamepadButtonType::South))
        {
            info!("{:?} just released South", gamepad);
        }

        let right_trigger = button_axes
            .get(GamepadButton::new(
                gamepad,
                GamepadButtonType::RightTrigger2,
            ))
            .unwrap();
        if right_trigger.abs() > 0.01 {
            info!("{:?} RightTrigger2 value is {}", gamepad, right_trigger);
        }

        let left_stick_x = axes
            .get(GamepadAxis::new(gamepad, GamepadAxisType::LeftStickX))
            .unwrap();
        if left_stick_x.abs() > 0.01 {
            info!("{:?} LeftStickX value is {}", gamepad, left_stick_x);
        }
    }
}

examples/stress_tests/bevymark.rs (line 317)

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

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

    if mouse_button_input.pressed(MouseButton::Left) {
        let spawn_count = (BIRDS_PER_SECOND as f64 * time.delta_seconds_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/tools/scene_viewer/../../helpers/camera_controller.rs (line 168)

fn run_camera_controller(
    time: Res<Time>,
    mut windows: Query<&mut Window>,
    mut mouse_events: EventReader<MouseMotion>,
    mut scroll_events: EventReader<MouseWheel>,
    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_seconds();

    if let Ok((mut transform, mut controller)) = query.get_single_mut() {
        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 {
            mouse_events.clear();
            return;
        }

        let mut scroll = 0.0;
        for scroll_event in scroll_events.read() {
            let amount = match scroll_event.unit {
                MouseScrollUnit::Line => scroll_event.y,
                MouseScrollUnit::Pixel => scroll_event.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;

        // Apply movement update
        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;
            }
        }
        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 mut window in &mut windows {
                    if !window.focused {
                        continue;
                    }

                    window.cursor.grab_mode = CursorGrabMode::Locked;
                    window.cursor.visible = false;
                }
            } else {
                for mut window in &mut windows {
                    window.cursor.grab_mode = CursorGrabMode::None;
                    window.cursor.visible = true;
                }
            }
        }

        // Handle mouse input
        let mut mouse_delta = Vec2::ZERO;
        if cursor_grab {
            for mouse_event in mouse_events.read() {
                mouse_delta += mouse_event.delta;
            }
        } else {
            mouse_events.clear();
        }

        if mouse_delta != Vec2::ZERO {
            // Apply look update
            controller.pitch = (controller.pitch
                - mouse_delta.y * RADIANS_PER_DOT * controller.sensitivity)
                .clamp(-PI / 2., PI / 2.);
            controller.yaw -= mouse_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 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 106)

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 + Copy + Eq + Hash + Send + Sync + 'static,

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for ButtonInput<T>

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

fn default() -> ButtonInput<T>

Returns the “default value” for a type.

impl<T> FromReflect for ButtonInput<T>

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

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

Constructs a concrete instance of Self from a reflected value.

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

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

impl<T> GetTypeRegistration for ButtonInput<T>

where T: Copy + Eq + Hash + Send + Sync + 'static + TypePath, ButtonInput<T>: Any + Send + Sync, HashSet<T>: FromReflect + TypePath + 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> Reflect for ButtonInput<T>

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

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

Returns the TypeInfo of the type represented by this value.

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 reflected value.

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

Casts this type to a reflected value.

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

Casts this type to a mutable reflected value.

fn clone_value(&self) -> Box<dyn Reflect>

Clones the value as a Reflect trait object.

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

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

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

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

Returns a “partial equality” comparison result.

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 serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value.

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl<T> Struct for ButtonInput<T>

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

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

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

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

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

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

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

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

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

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 clone_dynamic(&self) -> DynamicStruct

Clones the struct into a DynamicStruct.

impl<T> TypePath for ButtonInput<T>

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

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl<T> Resource for ButtonInput<T>

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