Make key events exhaustive.

Means we can add keys without breaking backwards compatibility.

KeyEvents are also manually numbered to discourage anyone adding one
in the middle instead of at the end.

Author: thejpster

src/lib.rs

@@ -67,132 +67,134 @@ pub enum Error {
 
 /// Keycodes that can be generated by a keyboard.
 #[derive(Debug, PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
+#[non_exhaustive]
 pub enum KeyCode {
-    AltLeft,
-    AltRight,
-    ArrowDown,
-    ArrowLeft,
-    ArrowRight,
-    ArrowUp,
-    BackSlash,
-    Backspace,
-    BackTick,
-    BracketSquareLeft,
-    BracketSquareRight,
-    Break,
-    CapsLock,
-    Comma,
-    ControlLeft,
-    ControlRight,
-    Delete,
-    End,
-    Enter,
-    Escape,
-    Equals,
-    F1,
-    F2,
-    F3,
-    F4,
-    F5,
-    F6,
-    F7,
-    F8,
-    F9,
-    F10,
-    F11,
-    F12,
-    Fullstop,
-    Home,
-    Insert,
-    Key1,
-    Key2,
-    Key3,
-    Key4,
-    Key5,
-    Key6,
-    Key7,
-    Key8,
-    Key9,
-    Key0,
-    Menus,
-    Minus,
-    Numpad0,
-    Numpad1,
-    Numpad2,
-    Numpad3,
-    Numpad4,
-    Numpad5,
-    Numpad6,
-    Numpad7,
-    Numpad8,
-    Numpad9,
-    NumpadEnter,
-    NumpadLock,
-    NumpadSlash,
-    NumpadStar,
-    NumpadMinus,
-    NumpadPeriod,
-    NumpadPlus,
-    PageDown,
-    PageUp,
-    PauseBreak,
-    PrintScreen,
-    ScrollLock,
-    SemiColon,
-    ShiftLeft,
-    ShiftRight,
-    Slash,
-    Spacebar,
-    SysReq,
-    Tab,
-    Quote,
-    WindowsLeft,
-    WindowsRight,
-    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,
-    /// Not on US keyboards
-    HashTilde,
+    AltLeft = 0,
+    AltRight = 1,
+    ArrowDown = 2,
+    ArrowLeft = 3,
+    ArrowRight = 4,
+    ArrowUp = 5,
+    BackSlash = 6,
+    Backspace = 7,
+    BackTick = 8,
+    BracketSquareLeft = 9,
+    BracketSquareRight = 10,
+    Break = 11,
+    CapsLock = 12,
+    Comma = 13,
+    ControlLeft = 14,
+    ControlRight = 15,
+    Delete = 16,
+    End = 17,
+    Enter = 18,
+    Escape = 19,
+    Equals = 20,
+    F1 = 21,
+    F2 = 22,
+    F3 = 23,
+    F4 = 24,
+    F5 = 26,
+    F6 = 27,
+    F7 = 28,
+    F8 = 29,
+    F9 = 30,
+    F10 = 31,
+    F11 = 32,
+    F12 = 33,
+    Fullstop = 34,
+    Home = 36,
+    Insert = 37,
+    Key1 = 38,
+    Key2 = 39,
+    Key3 = 40,
+    Key4 = 41,
+    Key5 = 42,
+    Key6 = 43,
+    Key7 = 44,
+    Key8 = 46,
+    Key9 = 47,
+    Key0 = 48,
+    Menus = 49,
+    Minus = 50,
+    Numpad0 = 51,
+    Numpad1 = 52,
+    Numpad2 = 53,
+    Numpad3 = 54,
+    Numpad4 = 56,
+    Numpad5 = 57,
+    Numpad6 = 58,
+    Numpad7 = 59,
+    Numpad8 = 60,
+    Numpad9 = 61,
+    NumpadEnter = 62,
+    NumpadLock = 63,
+    NumpadSlash = 64,
+    NumpadStar = 66,
+    NumpadMinus = 67,
+    NumpadPeriod = 68,
+    NumpadPlus = 69,
+    PageDown = 70,
+    PageUp = 71,
+    PauseBreak = 72,
+    PrintScreen = 73,
+    ScrollLock = 74,
+    SemiColon = 76,
+    ShiftLeft = 77,
+    ShiftRight = 78,
+    Slash = 79,
+    Spacebar = 80,
+    SysReq = 81,
+    Tab = 82,
+    Quote = 83,
+    WindowsLeft = 84,
+    WindowsRight = 86,
+    A = 87,
+    B = 88,
+    C = 89,
+    D = 90,
+    E = 91,
+    F = 92,
+    G = 93,
+    H = 94,
+    I = 96,
+    J = 97,
+    K = 98,
+    L = 99,
+    M = 100,
+    N = 101,
+    O = 102,
+    P = 103,
+    Q = 104,
+    R = 106,
+    S = 107,
+    T = 108,
+    U = 109,
+    V = 110,
+    W = 111,
+    X = 112,
+    Y = 113,
+    Z = 114,
+    /// The key to the left of the 102/105-key "Tall Return" Key - not on 101/104-key keyboards
+    HashTilde = 115,
     // Scan code set 1 unique codes
-    PrevTrack,
-    NextTrack,
-    Mute,
-    Calculator,
-    Play,
-    Stop,
-    VolumeDown,
-    VolumeUp,
-    WWWHome,
-    // Sent when the keyboard boots
-    PowerOnTestOk,
-    Oem102,
+    PrevTrack = 116,
+    NextTrack = 117,
+    Mute = 118,
+    Calculator = 119,
+    Play = 120,
+    Stop = 121,
+    VolumeDown = 122,
+    VolumeUp = 123,
+    WWWHome = 124,
+    /// Sent when the keyboard boots
+    PowerOnTestOk = 125,
+    /// Used for `<>` on DE layouts
+    Oem102 = 126,
     /// PrintScreen comes in two parts - this is the second
-    PrintScreen2,
+    PrintScreen2 = 127,
     /// Sent by the keyboard when too many keys are pressed
-    TooManyKeys,
+    TooManyKeys = 128,
 }
 
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]