use crate::{    platform::mac::{        kTISPropertyUnicodeKeyLayoutData, LMGetKbdType, NSStringExt,        TISCopyCurrentKeyboardLayoutInputSource, TISGetInputSourceProperty, UCKeyTranslate,    },    point, px, KeyDownEvent, KeyUpEvent, Keystroke, Modifiers, ModifiersChangedEvent, MouseButton,    MouseDownEvent, MouseExitEvent, MouseMoveEvent, MouseUpEvent, NavigationDirection, Pixels,    PlatformInput, ScrollDelta, ScrollWheelEvent, TouchPhase,};use cocoa::{    appkit::{NSEvent, NSEventModifierFlags, NSEventPhase, NSEventType},    base::{id, YES},};use core_foundation::data::{CFDataGetBytePtr, CFDataRef};use core_graphics::event::CGKeyCode;use objc::{msg_send, sel, sel_impl};use std::{borrow::Cow, ffi::c_void}; const BACKSPACE_KEY: u16 = 0x7f;const SPACE_KEY: u16 = b' ' as u16;const ENTER_KEY: u16 = 0x0d;const NUMPAD_ENTER_KEY: u16 = 0x03;const ESCAPE_KEY: u16 = 0x1b;const TAB_KEY: u16 = 0x09;const SHIFT_TAB_KEY: u16 = 0x19; pub fn key_to_native(key: &str) -> Cow<str> {    use cocoa::appkit::*;    let code = match key {        "space" => SPACE_KEY,        "backspace" => BACKSPACE_KEY,        "up" => NSUpArrowFunctionKey,        "down" => NSDownArrowFunctionKey,        "left" => NSLeftArrowFunctionKey,        "right" => NSRightArrowFunctionKey,        "pageup" => NSPageUpFunctionKey,        "pagedown" => NSPageDownFunctionKey,        "home" => NSHomeFunctionKey,        "end" => NSEndFunctionKey,        "delete" => NSDeleteFunctionKey,        "insert" => NSHelpFunctionKey,        "f1" => NSF1FunctionKey,        "f2" => NSF2FunctionKey,        "f3" => NSF3FunctionKey,        "f4" => NSF4FunctionKey,        "f5" => NSF5FunctionKey,        "f6" => NSF6FunctionKey,        "f7" => NSF7FunctionKey,        "f8" => NSF8FunctionKey,        "f9" => NSF9FunctionKey,        "f10" => NSF10FunctionKey,        "f11" => NSF11FunctionKey,        "f12" => NSF12FunctionKey,        "f13" => NSF13FunctionKey,        "f14" => NSF14FunctionKey,        "f15" => NSF15FunctionKey,        "f16" => NSF16FunctionKey,        "f17" => NSF17FunctionKey,        "f18" => NSF18FunctionKey,        "f19" => NSF19FunctionKey,        _ => return Cow::Borrowed(key),    };    Cow::Owned(String::from_utf16(&[code]).unwrap())} unsafe fn read_modifiers(native_event: id) -> Modifiers {    let modifiers = native_event.modifierFlags();    let control = modifiers.contains(NSEventModifierFlags::NSControlKeyMask);    let alt = modifiers.contains(NSEventModifierFlags::NSAlternateKeyMask);    let shift = modifiers.contains(NSEventModifierFlags::NSShiftKeyMask);    let command = modifiers.contains(NSEventModifierFlags::NSCommandKeyMask);    let function = modifiers.contains(NSEventModifierFlags::NSFunctionKeyMask);     Modifiers {        control,        alt,        shift,        platform: command,        function,    }} impl PlatformInput {    pub(crate) unsafe fn from_native(        native_event: id,        window_height: Option<Pixels>,    ) -> Option<Self> {        let event_type = native_event.eventType();         // Filter out event types that aren't in the NSEventType enum.        // See https://github.com/servo/cocoa-rs/issues/155#issuecomment-323482792 for details.        match event_type as u64 {            0 | 21 | 32 | 33 | 35 | 36 | 37 => {                return None;            }            _ => {}        }         match event_type {            NSEventType::NSFlagsChanged => Some(Self::ModifiersChanged(ModifiersChangedEvent {                modifiers: read_modifiers(native_event),            })),            NSEventType::NSKeyDown => Some(Self::KeyDown(KeyDownEvent {                keystroke: parse_keystroke(native_event),                is_held: native_event.isARepeat() == YES,            })),            NSEventType::NSKeyUp => Some(Self::KeyUp(KeyUpEvent {                keystroke: parse_keystroke(native_event),            })),            NSEventType::NSLeftMouseDown            | NSEventType::NSRightMouseDown            | NSEventType::NSOtherMouseDown => {                let button = match native_event.buttonNumber() {                    0 => MouseButton::Left,                    1 => MouseButton::Right,                    2 => MouseButton::Middle,                    3 => MouseButton::Navigate(NavigationDirection::Back),                    4 => MouseButton::Navigate(NavigationDirection::Forward),                    // Other mouse buttons aren't tracked currently                    _ => return None,                };                window_height.map(|window_height| {                    Self::MouseDown(MouseDownEvent {                        button,                        position: point(                            px(native_event.locationInWindow().x as f32),                            // MacOS screen coordinates are relative to bottom left                            window_height - px(native_event.locationInWindow().y as f32),                        ),                        modifiers: read_modifiers(native_event),                        click_count: native_event.clickCount() as usize,                        first_mouse: false,                    })                })            }            NSEventType::NSLeftMouseUp            | NSEventType::NSRightMouseUp            | NSEventType::NSOtherMouseUp => {                let button = match native_event.buttonNumber() {                    0 => MouseButton::Left,                    1 => MouseButton::Right,                    2 => MouseButton::Middle,                    3 => MouseButton::Navigate(NavigationDirection::Back),                    4 => MouseButton::Navigate(NavigationDirection::Forward),                    // Other mouse buttons aren't tracked currently                    _ => return None,                };                 window_height.map(|window_height| {                    Self::MouseUp(MouseUpEvent {                        button,                        position: point(                            px(native_event.locationInWindow().x as f32),                            window_height - px(native_event.locationInWindow().y as f32),                        ),                        modifiers: read_modifiers(native_event),                        click_count: native_event.clickCount() as usize,                    })                })            }            // Some mice (like Logitech MX Master) send navigation buttons as swipe events            NSEventType::NSEventTypeSwipe => {                let navigation_direction = match native_event.phase() {                    NSEventPhase::NSEventPhaseEnded => match native_event.deltaX() {                        x if x > 0.0 => Some(NavigationDirection::Back),                        x if x < 0.0 => Some(NavigationDirection::Forward),                        _ => return None,                    },                    _ => return None,                };                 match navigation_direction {                    Some(direction) => window_height.map(|window_height| {                        Self::MouseDown(MouseDownEvent {                            button: MouseButton::Navigate(direction),                            position: point(                                px(native_event.locationInWindow().x as f32),                                window_height - px(native_event.locationInWindow().y as f32),                            ),                            modifiers: read_modifiers(native_event),                            click_count: 1,                            first_mouse: false,                        })                    }),                    _ => None,                }            }            NSEventType::NSScrollWheel => window_height.map(|window_height| {                let phase = match native_event.phase() {                    NSEventPhase::NSEventPhaseMayBegin | NSEventPhase::NSEventPhaseBegan => {                        TouchPhase::Started                    }                    NSEventPhase::NSEventPhaseEnded => TouchPhase::Ended,                    _ => TouchPhase::Moved,                };                 let raw_data = point(                    native_event.scrollingDeltaX() as f32,                    native_event.scrollingDeltaY() as f32,                );                 let delta = if native_event.hasPreciseScrollingDeltas() == YES {                    ScrollDelta::Pixels(raw_data.map(px))                } else {                    ScrollDelta::Lines(raw_data)                };                 Self::ScrollWheel(ScrollWheelEvent {                    position: point(                        px(native_event.locationInWindow().x as f32),                        window_height - px(native_event.locationInWindow().y as f32),                    ),                    delta,                    touch_phase: phase,                    modifiers: read_modifiers(native_event),                })            }),            NSEventType::NSLeftMouseDragged            | NSEventType::NSRightMouseDragged            | NSEventType::NSOtherMouseDragged => {                let pressed_button = match native_event.buttonNumber() {                    0 => MouseButton::Left,                    1 => MouseButton::Right,                    2 => MouseButton::Middle,                    3 => MouseButton::Navigate(NavigationDirection::Back),                    4 => MouseButton::Navigate(NavigationDirection::Forward),                    // Other mouse buttons aren't tracked currently                    _ => return None,                };                 window_height.map(|window_height| {                    Self::MouseMove(MouseMoveEvent {                        pressed_button: Some(pressed_button),                        position: point(                            px(native_event.locationInWindow().x as f32),                            window_height - px(native_event.locationInWindow().y as f32),                        ),                        modifiers: read_modifiers(native_event),                    })                })            }            NSEventType::NSMouseMoved => window_height.map(|window_height| {                Self::MouseMove(MouseMoveEvent {                    position: point(                        px(native_event.locationInWindow().x as f32),                        window_height - px(native_event.locationInWindow().y as f32),                    ),                    pressed_button: None,                    modifiers: read_modifiers(native_event),                })            }),            NSEventType::NSMouseExited => window_height.map(|window_height| {                Self::MouseExited(MouseExitEvent {                    position: point(                        px(native_event.locationInWindow().x as f32),                        window_height - px(native_event.locationInWindow().y as f32),                    ),                     pressed_button: None,                    modifiers: read_modifiers(native_event),                })            }),            _ => None,        }    }} unsafe fn parse_keystroke(native_event: id) -> Keystroke {    use cocoa::appkit::*;     let mut characters = native_event        .charactersIgnoringModifiers()        .to_str()        .to_string();    let mut key_char = None;    let first_char = characters.chars().next().map(|ch| ch as u16);    let modifiers = native_event.modifierFlags();     let control = modifiers.contains(NSEventModifierFlags::NSControlKeyMask);    let alt = modifiers.contains(NSEventModifierFlags::NSAlternateKeyMask);    let mut shift = modifiers.contains(NSEventModifierFlags::NSShiftKeyMask);    let command = modifiers.contains(NSEventModifierFlags::NSCommandKeyMask);    let function = modifiers.contains(NSEventModifierFlags::NSFunctionKeyMask)        && first_char.map_or(true, |ch| {            !(NSUpArrowFunctionKey..=NSModeSwitchFunctionKey).contains(&ch)        });     #[allow(non_upper_case_globals)]    let key = match first_char {        Some(SPACE_KEY) => {            key_char = Some(" ".to_string());            "space".to_string()        }        Some(TAB_KEY) => {            key_char = Some("\t".to_string());            "tab".to_string()        }        Some(ENTER_KEY) | Some(NUMPAD_ENTER_KEY) => {            key_char = Some("\n".to_string());            "enter".to_string()        }        Some(BACKSPACE_KEY) => "backspace".to_string(),        Some(ESCAPE_KEY) => "escape".to_string(),        Some(SHIFT_TAB_KEY) => "tab".to_string(),        Some(NSUpArrowFunctionKey) => "up".to_string(),        Some(NSDownArrowFunctionKey) => "down".to_string(),        Some(NSLeftArrowFunctionKey) => "left".to_string(),        Some(NSRightArrowFunctionKey) => "right".to_string(),        Some(NSPageUpFunctionKey) => "pageup".to_string(),        Some(NSPageDownFunctionKey) => "pagedown".to_string(),        Some(NSHomeFunctionKey) => "home".to_string(),        Some(NSEndFunctionKey) => "end".to_string(),        Some(NSDeleteFunctionKey) => "delete".to_string(),        // Observed Insert==NSHelpFunctionKey not NSInsertFunctionKey.        Some(NSHelpFunctionKey) => "insert".to_string(),        Some(NSF1FunctionKey) => "f1".to_string(),        Some(NSF2FunctionKey) => "f2".to_string(),        Some(NSF3FunctionKey) => "f3".to_string(),        Some(NSF4FunctionKey) => "f4".to_string(),        Some(NSF5FunctionKey) => "f5".to_string(),        Some(NSF6FunctionKey) => "f6".to_string(),        Some(NSF7FunctionKey) => "f7".to_string(),        Some(NSF8FunctionKey) => "f8".to_string(),        Some(NSF9FunctionKey) => "f9".to_string(),        Some(NSF10FunctionKey) => "f10".to_string(),        Some(NSF11FunctionKey) => "f11".to_string(),        Some(NSF12FunctionKey) => "f12".to_string(),        Some(NSF13FunctionKey) => "f13".to_string(),        Some(NSF14FunctionKey) => "f14".to_string(),        Some(NSF15FunctionKey) => "f15".to_string(),        Some(NSF16FunctionKey) => "f16".to_string(),        Some(NSF17FunctionKey) => "f17".to_string(),        Some(NSF18FunctionKey) => "f18".to_string(),        Some(NSF19FunctionKey) => "f19".to_string(),        _ => {            // Cases to test when modifying this:            //            //           qwerty key | none | cmd   | cmd-shift            // * Armenian         s | ս    | cmd-s | cmd-shift-s  (layout is non-ASCII, so we use cmd layout)            // * Dvorak+QWERTY    s | o    | cmd-s | cmd-shift-s  (layout switches on cmd)            // * Ukrainian+QWERTY s | с    | cmd-s | cmd-shift-s  (macOS reports cmd-s instead of cmd-S)            // * Czech            7 | ý    | cmd-ý | cmd-7        (layout has shifted numbers)            // * Norwegian        7 | 7    | cmd-7 | cmd-/        (macOS reports cmd-shift-7 instead of cmd-/)            // * Russian          7 | 7    | cmd-7 | cmd-&        (shift-7 is . but when cmd is down, should use cmd layout)            // * German QWERTZ    ; | ö    | cmd-ö | cmd-Ö        (Zed's shift special case only applies to a-z)            //            let mut chars_ignoring_modifiers =                chars_for_modified_key(native_event.keyCode(), NO_MOD);            let mut chars_with_shift = chars_for_modified_key(native_event.keyCode(), SHIFT_MOD);            let always_use_cmd_layout = always_use_command_layout();             // Handle Dvorak+QWERTY / Russian / Armenian            if command || always_use_cmd_layout {                let chars_with_cmd = chars_for_modified_key(native_event.keyCode(), CMD_MOD);                let chars_with_both =                    chars_for_modified_key(native_event.keyCode(), CMD_MOD | SHIFT_MOD);                 // We don't do this in the case that the shifted command key generates                // the same character as the unshifted command key (Norwegian, e.g.)                if chars_with_both != chars_with_cmd {                    chars_with_shift = chars_with_both;                 // Handle edge-case where cmd-shift-s reports cmd-s instead of                // cmd-shift-s (Ukrainian, etc.)                } else if chars_with_cmd.to_ascii_uppercase() != chars_with_cmd {                    chars_with_shift = chars_with_cmd.to_ascii_uppercase();                }                chars_ignoring_modifiers = chars_with_cmd;            }             if !control && !command && !function {                let mut mods = NO_MOD;                if shift {                    mods |= SHIFT_MOD;                }                if alt {                    mods |= OPTION_MOD;                }                 key_char = Some(chars_for_modified_key(native_event.keyCode(), mods));            }             let mut key = if shift                && chars_ignoring_modifiers                    .chars()                    .all(|c| c.is_ascii_lowercase())            {                chars_ignoring_modifiers            } else if shift {                shift = false;                chars_with_shift            } else {                chars_ignoring_modifiers            };             key        }    };     Keystroke {        modifiers: Modifiers {            control,            alt,            shift,            platform: command,            function,        },        key,        key_char,    }} fn always_use_command_layout() -> bool {    if chars_for_modified_key(0, NO_MOD).is_ascii() {        return false;    }     chars_for_modified_key(0, CMD_MOD).is_ascii()} const NO_MOD: u32 = 0;const CMD_MOD: u32 = 1;const SHIFT_MOD: u32 = 2;const OPTION_MOD: u32 = 8; fn chars_for_modified_key(code: CGKeyCode, modifiers: u32) -> String {    // Values from: https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.6.sdk/System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/Headers/Events.h#L126    // shifted >> 8 for UCKeyTranslate    const CG_SPACE_KEY: u16 = 49;    // https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.6.sdk/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/Headers/UnicodeUtilities.h#L278    #[allow(non_upper_case_globals)]    const kUCKeyActionDown: u16 = 0;    #[allow(non_upper_case_globals)]    const kUCKeyTranslateNoDeadKeysMask: u32 = 0;     let keyboard_type = unsafe { LMGetKbdType() as u32 };    const BUFFER_SIZE: usize = 4;    let mut dead_key_state = 0;    let mut buffer: [u16; BUFFER_SIZE] = [0; BUFFER_SIZE];    let mut buffer_size: usize = 0;     let keyboard = unsafe { TISCopyCurrentKeyboardLayoutInputSource() };    if keyboard.is_null() {        return "".to_string();    }    let layout_data = unsafe {        TISGetInputSourceProperty(keyboard, kTISPropertyUnicodeKeyLayoutData as *const c_void)            as CFDataRef    };    if layout_data.is_null() {        unsafe {            let _: () = msg_send![keyboard, release];        }        return "".to_string();    }    let keyboard_layout = unsafe { CFDataGetBytePtr(layout_data) };     unsafe {        UCKeyTranslate(            keyboard_layout as *const c_void,            code,            kUCKeyActionDown,            modifiers,            keyboard_type,            kUCKeyTranslateNoDeadKeysMask,            &mut dead_key_state,            BUFFER_SIZE,            &mut buffer_size as *mut usize,            &mut buffer as *mut u16,        );        if dead_key_state != 0 {            UCKeyTranslate(                keyboard_layout as *const c_void,                CG_SPACE_KEY,                kUCKeyActionDown,                modifiers,                keyboard_type,                kUCKeyTranslateNoDeadKeysMask,                &mut dead_key_state,                BUFFER_SIZE,                &mut buffer_size as *mut usize,                &mut buffer as *mut u16,            );        }        let _: () = msg_send![keyboard, release];    }    String::from_utf16(&buffer[..buffer_size]).unwrap_or_default()}