agui_widgets 0.3.0

use std::collections::HashMap;

pub struct Keyboard {
    pub keys: HashMap<KeyCode, KeyState>,
    pub modifiers: Modifiers,
}

impl Keyboard {
    pub fn is_pressed(&self, key: &KeyCode) -> bool {
        self.keys
            .get(key)
            .map_or(false, |state| *state == KeyState::Pressed)
    }

    pub fn is_released(&self, key: &KeyCode) -> bool {
        self.keys
            .get(key)
            .map_or(false, |state| *state == KeyState::Released)
    }
}

impl Default for Keyboard {
    fn default() -> Self {
        Self {
            keys: HashMap::default(),
            modifiers: Modifiers::default(),
        }
    }
}

#[derive(Default)]
pub struct KeyboardInput(pub char);

/// Describes the input state of a key.
#[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
pub enum KeyState {
    Pressed,
    Released,
}

#[derive(Debug, Hash, Ord, PartialOrd, PartialEq, Eq, Clone, Copy)]
#[repr(u32)]
pub enum KeyCode {
    /// The '1' key over the letters.
    Key1,
    /// The '2' key over the letters.
    Key2,
    /// The '3' key over the letters.
    Key3,
    /// The '4' key over the letters.
    Key4,
    /// The '5' key over the letters.
    Key5,
    /// The '6' key over the letters.
    Key6,
    /// The '7' key over the letters.
    Key7,
    /// The '8' key over the letters.
    Key8,
    /// The '9' key over the letters.
    Key9,
    /// The '0' key over the 'O' and 'P' keys.
    Key0,

    A,
    B,
    C,
    D,
    E,
    F,
    G,
    H,
    I,
    J,
    K,
    L,
    M,
    N,
    O,
    P,
    Q,
    R,
    S,
    T,
    U,
    V,
    W,
    X,
    Y,
    Z,

    /// The Escape key, next to F1.
    Escape,

    F1,
    F2,
    F3,
    F4,
    F5,
    F6,
    F7,
    F8,
    F9,
    F10,
    F11,
    F12,
    F13,
    F14,
    F15,
    F16,
    F17,
    F18,
    F19,
    F20,
    F21,
    F22,
    F23,
    F24,

    /// Print Screen/SysRq.
    Snapshot,
    /// Scroll Lock.
    Scroll,
    /// Pause/Break key, next to Scroll lock.
    Pause,

    /// `Insert`, next to Backspace.
    Insert,
    Home,
    Delete,
    End,
    PageDown,
    PageUp,

    Left,
    Up,
    Right,
    Down,

    /// The Backspace key, right over Enter.
    // TODO: rename
    Back,
    /// The Enter key.
    Return,
    /// The space bar.
    Space,

    /// The "Compose" key on Linux.
    Compose,

    Caret,

    Numlock,
    Numpad0,
    Numpad1,
    Numpad2,
    Numpad3,
    Numpad4,
    Numpad5,
    Numpad6,
    Numpad7,
    Numpad8,
    Numpad9,
    NumpadAdd,
    NumpadDivide,
    NumpadDecimal,
    NumpadComma,
    NumpadEnter,
    NumpadEquals,
    NumpadMultiply,
    NumpadSubtract,

    AbntC1,
    AbntC2,
    Apostrophe,
    Apps,
    Asterisk,
    At,
    Ax,
    Backslash,
    Calculator,
    Capital,
    Colon,
    Comma,
    Convert,
    Equals,
    Grave,
    Kana,
    Kanji,
    LAlt,
    LBracket,
    LControl,
    LShift,
    LWin,
    Mail,
    MediaSelect,
    MediaStop,
    Minus,
    Mute,
    MyComputer,
    // also called "Next"
    NavigateForward,
    // also called "Prior"
    NavigateBackward,
    NextTrack,
    NoConvert,
    OEM102,
    Period,
    PlayPause,
    Plus,
    Power,
    PrevTrack,
    RAlt,
    RBracket,
    RControl,
    RShift,
    RWin,
    Semicolon,
    Slash,
    Sleep,
    Stop,
    Sysrq,
    Tab,
    Underline,
    Unlabeled,
    VolumeDown,
    VolumeUp,
    Wake,
    WebBack,
    WebFavorites,
    WebForward,
    WebHome,
    WebRefresh,
    WebSearch,
    WebStop,
    Yen,
    Copy,
    Paste,
    Cut,
}

bitflags::bitflags! {
    /// Represents the current state of the keyboard modifiers
    ///
    /// Each flag represents a modifier and is set if this modifier is active.
    #[derive(Default)]
    pub struct Modifiers: u32 {
        /// The "shift" key.
        const SHIFT = 0b100;
        // const LSHIFT = 0b010 << 0;
        // const RSHIFT = 0b001 << 0;
        
        /// The "control" key.
        const CTRL = 0b100 << 3;
        // const LCTRL = 0b010 << 3;
        // const RCTRL = 0b001 << 3;

        /// The "alt" key.
        const ALT = 0b100 << 6;
        // const LALT = 0b010 << 6;
        // const RALT = 0b001 << 6;

        /// This is the "windows" key on PC and "command" key on Mac.
        const LOGO = 0b100 << 9;
        // const LLOGO = 0b010 << 9;
        // const RLOGO = 0b001 << 9;
    }
}

impl Modifiers {
    /// Returns `true` if the shift key is pressed.
    pub fn shift(&self) -> bool {
        self.intersects(Self::SHIFT)
    }
    /// Returns `true` if the control key is pressed.
    pub fn ctrl(&self) -> bool {
        self.intersects(Self::CTRL)
    }
    /// Returns `true` if the alt key is pressed.
    pub fn alt(&self) -> bool {
        self.intersects(Self::ALT)
    }
    /// Returns `true` if the logo key is pressed.
    pub fn logo(&self) -> bool {
        self.intersects(Self::LOGO)
    }
}