fyrox-impl 1.0.1

// Copyright (c) 2019-present Dmitry Stepanov and Fyrox Engine contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

//! This module contains a set of "shortcuts" that allows getting the state of a mouse and a keyboard
//! in a simplified manner (read - without using "verbose" event-based approach). It may be useful
//! in simple scenarios where you just need to know if a button (on keyboard, mouse) was pressed
//! and do something. You should always prefer the event-based approach when possible.

use fxhash::{FxHashMap, FxHashSet};
use fyrox_core::algebra::Vector2;
use winit::event::{ButtonId, ElementState};
use winit::keyboard::{KeyCode, PhysicalKey};

/// Represents the mouse state in the current frame. The contents of this structure is a simplified
/// version of event-based approach. **Important:** this structure does not track from which mouse the
/// corresponding event has come from, if you have more than one mouse use event-based approach
/// instead!
#[derive(Default, Clone)]
pub struct Mouse {
    /// Coordinates in pixels relative to the top-left corner of the window.
    pub position: Vector2<f32>,
    /// Speed of the mouse in some units.
    pub speed: Vector2<f32>,
    /// Physical state of mouse buttons. Usually, the button indices are the following:
    ///
    /// - 0 - left mouse button
    /// - 1 - right mouse button
    /// - 2 - middle mouse button
    /// - 3 - additional mouse button (could back or forward)
    /// - 4 - additional mouse button (could back or forward)
    /// - 5 and higher - device-specific buttons
    ///
    /// There are named constants for the tree most used ones - [`Mouse::LEFT_BUTTON`],
    /// [`Mouse::RIGHT_BUTTON`], [`Mouse::MIDDLE_BUTTON`].
    pub buttons_state: FxHashMap<ButtonId, ElementState>,
    /// A hash set that contains all the buttons that were pressed in the current frame. If a button
    /// is still pressed in the next frame, this hash map will not contain it. This is useful
    /// to check if a button was pressed and some action, but do not repeat the same action over and
    /// over until the button is released.
    pub pressed_buttons: FxHashSet<ButtonId>,
    /// A hash set that contains all the buttons that were released in the current frame. If a button
    /// is still released in the next frame, this hash map will not contain it. This is useful
    /// to check if a button was released and some action, but do not repeat the same action over and
    /// over until the button is pressed.
    pub released_buttons: FxHashSet<ButtonId>,
}

impl Mouse {
    /// Index of the left button.
    pub const LEFT_BUTTON: ButtonId = 0;
    /// Index of the right button.
    pub const RIGHT_BUTTON: ButtonId = 1;
    /// Index of the middle button.
    pub const MIDDLE_BUTTON: ButtonId = 2;
}

/// Represents the keyboard state in the current frame. The contents of this structure is a simplified
/// version of event-based approach. **Important:** this structure does not track from which keyboard the
/// corresponding event has come from, if you have more than one keyboard use event-based approach
/// instead!
#[derive(Default, Clone)]
pub struct Keyboard {
    /// Represents the keyboard state in the current frame.
    pub keys: FxHashMap<PhysicalKey, ElementState>,
    /// A hash set that contains all the keys that were pressed in the current frame. If a key
    /// is still pressed in the next frame, this hash map will not contain it. This is useful
    /// to check if a key was pressed and some action, but do not repeat the same action over and
    /// over until the key is released.
    pub pressed_keys: FxHashSet<PhysicalKey>,
    /// A hash set that contains all the keys that were released in the current frame. If a key
    /// is still released in the next frame, this hash map will not contain it. This is useful
    /// to check if a key was released and some action, but do not repeat the same action over and
    /// over until the key is pressed.
    pub released_keys: FxHashSet<PhysicalKey>,
}

/// A stored state of most common input events. It is used a "shortcut" in cases where event-based
/// approach is too verbose. **Important:** this structure does not track from which device the
/// corresponding event has come from, if you have more than one keyboard and/or mouse, use
/// event-based approach instead! You should always prefer the event-based approach when possible.
#[derive(Default, Clone)]
pub struct InputState {
    /// Represents the mouse state in the current frame.
    pub mouse: Mouse,
    /// Represents the keyboard state in the current frame.
    pub keyboard: Keyboard,
}

impl InputState {
    /// Returns `true` if the specified key is pressed, `false` - otherwise.
    #[inline]
    pub fn is_key_down(&self, key: KeyCode) -> bool {
        self.keyboard
            .keys
            .get(&PhysicalKey::Code(key))
            .is_some_and(|state| *state == ElementState::Pressed)
    }

    /// Returns `true` if the specified key was pressed in the current frame, `false` - otherwise.
    /// This method will return `false` if the key is still pressed in the next frame. This is
    /// useful to check if a key was pressed and some action, but do not repeat the same action
    /// over and over until the key is released.
    #[inline]
    pub fn is_key_pressed(&self, key: KeyCode) -> bool {
        self.keyboard.pressed_keys.contains(&PhysicalKey::Code(key))
    }

    /// Returns `true` if the specified key was released in the current frame, `false` - otherwise.
    /// This method will return `false` if the key is still released in the next frame. This is
    /// useful to check if a key was released and some action, but do not repeat the same action
    /// over and over until the key is pressed.
    #[inline]
    pub fn is_key_released(&self, key: KeyCode) -> bool {
        self.keyboard
            .released_keys
            .contains(&PhysicalKey::Code(key))
    }

    /// Returns `true` if the specified mouse button is pressed, `false` - otherwise. Usually,
    /// the button indices are the following:
    ///
    /// - 0 - left mouse button
    /// - 1 - right mouse button
    /// - 2 - middle mouse button
    /// - 3 - additional mouse button (could back or forward)
    /// - 4 - additional mouse button (could back or forward)
    /// - 5 and higher - device-specific buttons
    ///
    /// There are named constants for the tree most used ones - [`Mouse::LEFT_BUTTON`],
    /// [`Mouse::RIGHT_BUTTON`], [`Mouse::MIDDLE_BUTTON`].
    #[inline]
    pub fn is_mouse_button_down(&self, button_id: ButtonId) -> bool {
        self.mouse
            .buttons_state
            .get(&button_id)
            .is_some_and(|state| *state == ElementState::Pressed)
    }

    /// Returns `true` if the specified button was pressed in the current frame, `false` - otherwise.
    /// This method will return `false` if the button is still pressed in the next frame. This is
    /// useful to check if a button was pressed and some action, but do not repeat the same action
    /// over and over until the button is released. See the docs of [`Self::is_mouse_button_down`]
    /// for button ids.
    #[inline]
    pub fn is_mouse_button_pressed(&self, button_id: ButtonId) -> bool {
        self.mouse.pressed_buttons.contains(&button_id)
    }

    /// Returns `true` if the specified button was released in the current frame, `false` - otherwise.
    /// This method will return `false` if the button is still released in the next frame. This is
    /// useful to check if a button was released and some action, but do not repeat the same action
    /// over and over until the button is pressed. See the docs of [`Self::is_mouse_button_down`]
    /// for button ids.
    #[inline]
    pub fn is_mouse_button_released(&self, button_id: ButtonId) -> bool {
        self.mouse.released_buttons.contains(&button_id)
    }

    /// Returns `true` if the left mouse button is pressed, `false` - otherwise.
    #[inline]
    pub fn is_left_mouse_button_down(&self) -> bool {
        self.is_mouse_button_down(Mouse::LEFT_BUTTON)
    }

    /// Returns `true` if the right mouse button is pressed, `false` - otherwise.
    #[inline]
    pub fn is_right_mouse_button_down(&self) -> bool {
        self.is_mouse_button_down(Mouse::RIGHT_BUTTON)
    }

    /// Returns `true` if the middle mouse button pressed is pressed, `false` - otherwise.
    #[inline]
    pub fn is_middle_mouse_button_down(&self) -> bool {
        self.is_mouse_button_down(Mouse::MIDDLE_BUTTON)
    }

    /// Returns `true` if the left mouse button was pressed on the current frame,
    /// `false` - otherwise.
    #[inline]
    pub fn is_left_mouse_button_pressed(&self) -> bool {
        self.is_mouse_button_pressed(Mouse::LEFT_BUTTON)
    }

    /// Returns `true` if the right mouse button was pressed on the current frame,
    /// `false` - otherwise.
    #[inline]
    pub fn is_right_mouse_button_pressed(&self) -> bool {
        self.is_mouse_button_pressed(Mouse::RIGHT_BUTTON)
    }

    /// Returns `true` if the middle mouse button was pressed on the current frame,
    /// `false` - otherwise.
    #[inline]
    pub fn is_middle_mouse_button_pressed(&self) -> bool {
        self.is_mouse_button_pressed(Mouse::MIDDLE_BUTTON)
    }

    /// Returns `true` if the left mouse button was released on the current frame,
    /// `false` - otherwise.
    #[inline]
    pub fn is_left_mouse_button_released(&self) -> bool {
        self.is_mouse_button_released(Mouse::LEFT_BUTTON)
    }

    /// Returns `true` if the right mouse button was released on the current frame,
    /// `false` - otherwise.
    #[inline]
    pub fn is_right_mouse_button_released(&self) -> bool {
        self.is_mouse_button_released(Mouse::RIGHT_BUTTON)
    }

    /// Returns `true` if the middle mouse button was released on the current frame,
    /// `false` - otherwise.
    #[inline]
    pub fn is_middle_mouse_button_released(&self) -> bool {
        self.is_mouse_button_released(Mouse::MIDDLE_BUTTON)
    }

    /// Returns mouse speed in the current frame, the speed expressed in some arbitrary units.
    #[inline]
    pub fn mouse_speed(&self) -> Vector2<f32> {
        self.mouse.speed
    }

    /// Returns mouse position in pixels relative to the top-left corner of the main window.
    #[inline]
    pub fn mouse_position(&self) -> Vector2<f32> {
        self.mouse.position
    }
}