1use super::{BoolExt, MacDisplay, NSRange, NSStringExt, ns_string, renderer};
   2use crate::{
   3    AnyWindowHandle, Bounds, Capslock, DisplayLink, ExternalPaths, FileDropEvent,
   4    ForegroundExecutor, KeyDownEvent, Keystroke, Modifiers, ModifiersChangedEvent, MouseButton,
   5    MouseDownEvent, MouseMoveEvent, MouseUpEvent, Pixels, PlatformAtlas, PlatformDisplay,
   6    PlatformInput, PlatformWindow, Point, PromptButton, PromptLevel, RequestFrameOptions,
   7    SharedString, Size, SystemWindowTab, Timer, WindowAppearance, WindowBackgroundAppearance,
   8    WindowBounds, WindowControlArea, WindowKind, WindowParams, dispatch_get_main_queue,
   9    dispatch_sys::dispatch_async_f, platform::PlatformInputHandler, point, px, size,
  10};
  11#[cfg(any(test, feature = "test-support"))]
  12use anyhow::Result;
  13use block::ConcreteBlock;
  14use cocoa::{
  15    appkit::{
  16        NSAppKitVersionNumber, NSAppKitVersionNumber12_0, NSApplication, NSBackingStoreBuffered,
  17        NSColor, NSEvent, NSEventModifierFlags, NSFilenamesPboardType, NSPasteboard, NSScreen,
  18        NSView, NSViewHeightSizable, NSViewWidthSizable, NSVisualEffectMaterial,
  19        NSVisualEffectState, NSVisualEffectView, NSWindow, NSWindowButton,
  20        NSWindowCollectionBehavior, NSWindowOcclusionState, NSWindowOrderingMode,
  21        NSWindowStyleMask, NSWindowTitleVisibility,
  22    },
  23    base::{id, nil},
  24    foundation::{
  25        NSArray, NSAutoreleasePool, NSDictionary, NSFastEnumeration, NSInteger, NSNotFound,
  26        NSOperatingSystemVersion, NSPoint, NSProcessInfo, NSRect, NSSize, NSString, NSUInteger,
  27        NSUserDefaults,
  28    },
  29};
  30#[cfg(any(test, feature = "test-support"))]
  31use image::RgbaImage;
  32
  33use core_graphics::display::{CGDirectDisplayID, CGPoint, CGRect};
  34use ctor::ctor;
  35use futures::channel::oneshot;
  36use objc::{
  37    class,
  38    declare::ClassDecl,
  39    msg_send,
  40    runtime::{BOOL, Class, NO, Object, Protocol, Sel, YES},
  41    sel, sel_impl,
  42};
  43use parking_lot::Mutex;
  44use raw_window_handle as rwh;
  45use smallvec::SmallVec;
  46use std::{
  47    cell::Cell,
  48    ffi::{CStr, c_void},
  49    mem,
  50    ops::Range,
  51    path::PathBuf,
  52    ptr::{self, NonNull},
  53    rc::Rc,
  54    sync::{Arc, Weak},
  55    time::Duration,
  56};
  57use util::ResultExt;
  58
  59const WINDOW_STATE_IVAR: &str = "windowState";
  60
  61static mut WINDOW_CLASS: *const Class = ptr::null();
  62static mut PANEL_CLASS: *const Class = ptr::null();
  63static mut VIEW_CLASS: *const Class = ptr::null();
  64static mut BLURRED_VIEW_CLASS: *const Class = ptr::null();
  65
  66#[allow(non_upper_case_globals)]
  67const NSWindowStyleMaskNonactivatingPanel: NSWindowStyleMask =
  68    NSWindowStyleMask::from_bits_retain(1 << 7);
  69#[allow(non_upper_case_globals)]
  70const NSNormalWindowLevel: NSInteger = 0;
  71#[allow(non_upper_case_globals)]
  72const NSPopUpWindowLevel: NSInteger = 101;
  73#[allow(non_upper_case_globals)]
  74const NSTrackingMouseEnteredAndExited: NSUInteger = 0x01;
  75#[allow(non_upper_case_globals)]
  76const NSTrackingMouseMoved: NSUInteger = 0x02;
  77#[allow(non_upper_case_globals)]
  78const NSTrackingActiveAlways: NSUInteger = 0x80;
  79#[allow(non_upper_case_globals)]
  80const NSTrackingInVisibleRect: NSUInteger = 0x200;
  81#[allow(non_upper_case_globals)]
  82const NSWindowAnimationBehaviorUtilityWindow: NSInteger = 4;
  83#[allow(non_upper_case_globals)]
  84const NSViewLayerContentsRedrawDuringViewResize: NSInteger = 2;
  85// https://developer.apple.com/documentation/appkit/nsdragoperation
  86type NSDragOperation = NSUInteger;
  87#[allow(non_upper_case_globals)]
  88const NSDragOperationNone: NSDragOperation = 0;
  89#[allow(non_upper_case_globals)]
  90const NSDragOperationCopy: NSDragOperation = 1;
  91#[derive(PartialEq)]
  92pub enum UserTabbingPreference {
  93    Never,
  94    Always,
  95    InFullScreen,
  96}
  97
  98#[link(name = "CoreGraphics", kind = "framework")]
  99unsafe extern "C" {
 100    // Widely used private APIs; Apple uses them for their Terminal.app.
 101    fn CGSMainConnectionID() -> id;
 102    fn CGSSetWindowBackgroundBlurRadius(
 103        connection_id: id,
 104        window_id: NSInteger,
 105        radius: i64,
 106    ) -> i32;
 107}
 108
 109#[ctor]
 110unsafe fn build_classes() {
 111    unsafe {
 112        WINDOW_CLASS = build_window_class("GPUIWindow", class!(NSWindow));
 113        PANEL_CLASS = build_window_class("GPUIPanel", class!(NSPanel));
 114        VIEW_CLASS = {
 115            let mut decl = ClassDecl::new("GPUIView", class!(NSView)).unwrap();
 116            decl.add_ivar::<*mut c_void>(WINDOW_STATE_IVAR);
 117            unsafe {
 118                decl.add_method(sel!(dealloc), dealloc_view as extern "C" fn(&Object, Sel));
 119
 120                decl.add_method(
 121                    sel!(performKeyEquivalent:),
 122                    handle_key_equivalent as extern "C" fn(&Object, Sel, id) -> BOOL,
 123                );
 124                decl.add_method(
 125                    sel!(keyDown:),
 126                    handle_key_down as extern "C" fn(&Object, Sel, id),
 127                );
 128                decl.add_method(
 129                    sel!(keyUp:),
 130                    handle_key_up as extern "C" fn(&Object, Sel, id),
 131                );
 132                decl.add_method(
 133                    sel!(mouseDown:),
 134                    handle_view_event as extern "C" fn(&Object, Sel, id),
 135                );
 136                decl.add_method(
 137                    sel!(mouseUp:),
 138                    handle_view_event as extern "C" fn(&Object, Sel, id),
 139                );
 140                decl.add_method(
 141                    sel!(rightMouseDown:),
 142                    handle_view_event as extern "C" fn(&Object, Sel, id),
 143                );
 144                decl.add_method(
 145                    sel!(rightMouseUp:),
 146                    handle_view_event as extern "C" fn(&Object, Sel, id),
 147                );
 148                decl.add_method(
 149                    sel!(otherMouseDown:),
 150                    handle_view_event as extern "C" fn(&Object, Sel, id),
 151                );
 152                decl.add_method(
 153                    sel!(otherMouseUp:),
 154                    handle_view_event as extern "C" fn(&Object, Sel, id),
 155                );
 156                decl.add_method(
 157                    sel!(mouseMoved:),
 158                    handle_view_event as extern "C" fn(&Object, Sel, id),
 159                );
 160                decl.add_method(
 161                    sel!(pressureChangeWithEvent:),
 162                    handle_view_event as extern "C" fn(&Object, Sel, id),
 163                );
 164                decl.add_method(
 165                    sel!(mouseExited:),
 166                    handle_view_event as extern "C" fn(&Object, Sel, id),
 167                );
 168                decl.add_method(
 169                    sel!(mouseDragged:),
 170                    handle_view_event as extern "C" fn(&Object, Sel, id),
 171                );
 172                decl.add_method(
 173                    sel!(scrollWheel:),
 174                    handle_view_event as extern "C" fn(&Object, Sel, id),
 175                );
 176                decl.add_method(
 177                    sel!(swipeWithEvent:),
 178                    handle_view_event as extern "C" fn(&Object, Sel, id),
 179                );
 180                decl.add_method(
 181                    sel!(flagsChanged:),
 182                    handle_view_event as extern "C" fn(&Object, Sel, id),
 183                );
 184
 185                decl.add_method(
 186                    sel!(makeBackingLayer),
 187                    make_backing_layer as extern "C" fn(&Object, Sel) -> id,
 188                );
 189
 190                decl.add_protocol(Protocol::get("CALayerDelegate").unwrap());
 191                decl.add_method(
 192                    sel!(viewDidChangeBackingProperties),
 193                    view_did_change_backing_properties as extern "C" fn(&Object, Sel),
 194                );
 195                decl.add_method(
 196                    sel!(setFrameSize:),
 197                    set_frame_size as extern "C" fn(&Object, Sel, NSSize),
 198                );
 199                decl.add_method(
 200                    sel!(displayLayer:),
 201                    display_layer as extern "C" fn(&Object, Sel, id),
 202                );
 203
 204                decl.add_protocol(Protocol::get("NSTextInputClient").unwrap());
 205                decl.add_method(
 206                    sel!(validAttributesForMarkedText),
 207                    valid_attributes_for_marked_text as extern "C" fn(&Object, Sel) -> id,
 208                );
 209                decl.add_method(
 210                    sel!(hasMarkedText),
 211                    has_marked_text as extern "C" fn(&Object, Sel) -> BOOL,
 212                );
 213                decl.add_method(
 214                    sel!(markedRange),
 215                    marked_range as extern "C" fn(&Object, Sel) -> NSRange,
 216                );
 217                decl.add_method(
 218                    sel!(selectedRange),
 219                    selected_range as extern "C" fn(&Object, Sel) -> NSRange,
 220                );
 221                decl.add_method(
 222                    sel!(firstRectForCharacterRange:actualRange:),
 223                    first_rect_for_character_range
 224                        as extern "C" fn(&Object, Sel, NSRange, id) -> NSRect,
 225                );
 226                decl.add_method(
 227                    sel!(insertText:replacementRange:),
 228                    insert_text as extern "C" fn(&Object, Sel, id, NSRange),
 229                );
 230                decl.add_method(
 231                    sel!(setMarkedText:selectedRange:replacementRange:),
 232                    set_marked_text as extern "C" fn(&Object, Sel, id, NSRange, NSRange),
 233                );
 234                decl.add_method(sel!(unmarkText), unmark_text as extern "C" fn(&Object, Sel));
 235                decl.add_method(
 236                    sel!(attributedSubstringForProposedRange:actualRange:),
 237                    attributed_substring_for_proposed_range
 238                        as extern "C" fn(&Object, Sel, NSRange, *mut c_void) -> id,
 239                );
 240                decl.add_method(
 241                    sel!(viewDidChangeEffectiveAppearance),
 242                    view_did_change_effective_appearance as extern "C" fn(&Object, Sel),
 243                );
 244
 245                // Suppress beep on keystrokes with modifier keys.
 246                decl.add_method(
 247                    sel!(doCommandBySelector:),
 248                    do_command_by_selector as extern "C" fn(&Object, Sel, Sel),
 249                );
 250
 251                decl.add_method(
 252                    sel!(acceptsFirstMouse:),
 253                    accepts_first_mouse as extern "C" fn(&Object, Sel, id) -> BOOL,
 254                );
 255
 256                decl.add_method(
 257                    sel!(characterIndexForPoint:),
 258                    character_index_for_point as extern "C" fn(&Object, Sel, NSPoint) -> u64,
 259                );
 260            }
 261            decl.register()
 262        };
 263        BLURRED_VIEW_CLASS = {
 264            let mut decl = ClassDecl::new("BlurredView", class!(NSVisualEffectView)).unwrap();
 265            unsafe {
 266                decl.add_method(
 267                    sel!(initWithFrame:),
 268                    blurred_view_init_with_frame as extern "C" fn(&Object, Sel, NSRect) -> id,
 269                );
 270                decl.add_method(
 271                    sel!(updateLayer),
 272                    blurred_view_update_layer as extern "C" fn(&Object, Sel),
 273                );
 274                decl.register()
 275            }
 276        };
 277    }
 278}
 279
 280pub(crate) fn convert_mouse_position(position: NSPoint, window_height: Pixels) -> Point<Pixels> {
 281    point(
 282        px(position.x as f32),
 283        // macOS screen coordinates are relative to bottom left
 284        window_height - px(position.y as f32),
 285    )
 286}
 287
 288unsafe fn build_window_class(name: &'static str, superclass: &Class) -> *const Class {
 289    unsafe {
 290        let mut decl = ClassDecl::new(name, superclass).unwrap();
 291        decl.add_ivar::<*mut c_void>(WINDOW_STATE_IVAR);
 292        decl.add_method(sel!(dealloc), dealloc_window as extern "C" fn(&Object, Sel));
 293
 294        decl.add_method(
 295            sel!(canBecomeMainWindow),
 296            yes as extern "C" fn(&Object, Sel) -> BOOL,
 297        );
 298        decl.add_method(
 299            sel!(canBecomeKeyWindow),
 300            yes as extern "C" fn(&Object, Sel) -> BOOL,
 301        );
 302        decl.add_method(
 303            sel!(windowDidResize:),
 304            window_did_resize as extern "C" fn(&Object, Sel, id),
 305        );
 306        decl.add_method(
 307            sel!(windowDidChangeOcclusionState:),
 308            window_did_change_occlusion_state as extern "C" fn(&Object, Sel, id),
 309        );
 310        decl.add_method(
 311            sel!(windowWillEnterFullScreen:),
 312            window_will_enter_fullscreen as extern "C" fn(&Object, Sel, id),
 313        );
 314        decl.add_method(
 315            sel!(windowWillExitFullScreen:),
 316            window_will_exit_fullscreen as extern "C" fn(&Object, Sel, id),
 317        );
 318        decl.add_method(
 319            sel!(windowDidMove:),
 320            window_did_move as extern "C" fn(&Object, Sel, id),
 321        );
 322        decl.add_method(
 323            sel!(windowDidChangeScreen:),
 324            window_did_change_screen as extern "C" fn(&Object, Sel, id),
 325        );
 326        decl.add_method(
 327            sel!(windowDidBecomeKey:),
 328            window_did_change_key_status as extern "C" fn(&Object, Sel, id),
 329        );
 330        decl.add_method(
 331            sel!(windowDidResignKey:),
 332            window_did_change_key_status as extern "C" fn(&Object, Sel, id),
 333        );
 334        decl.add_method(
 335            sel!(windowShouldClose:),
 336            window_should_close as extern "C" fn(&Object, Sel, id) -> BOOL,
 337        );
 338
 339        decl.add_method(sel!(close), close_window as extern "C" fn(&Object, Sel));
 340
 341        decl.add_method(
 342            sel!(draggingEntered:),
 343            dragging_entered as extern "C" fn(&Object, Sel, id) -> NSDragOperation,
 344        );
 345        decl.add_method(
 346            sel!(draggingUpdated:),
 347            dragging_updated as extern "C" fn(&Object, Sel, id) -> NSDragOperation,
 348        );
 349        decl.add_method(
 350            sel!(draggingExited:),
 351            dragging_exited as extern "C" fn(&Object, Sel, id),
 352        );
 353        decl.add_method(
 354            sel!(performDragOperation:),
 355            perform_drag_operation as extern "C" fn(&Object, Sel, id) -> BOOL,
 356        );
 357        decl.add_method(
 358            sel!(concludeDragOperation:),
 359            conclude_drag_operation as extern "C" fn(&Object, Sel, id),
 360        );
 361
 362        decl.add_method(
 363            sel!(addTitlebarAccessoryViewController:),
 364            add_titlebar_accessory_view_controller as extern "C" fn(&Object, Sel, id),
 365        );
 366
 367        decl.add_method(
 368            sel!(moveTabToNewWindow:),
 369            move_tab_to_new_window as extern "C" fn(&Object, Sel, id),
 370        );
 371
 372        decl.add_method(
 373            sel!(mergeAllWindows:),
 374            merge_all_windows as extern "C" fn(&Object, Sel, id),
 375        );
 376
 377        decl.add_method(
 378            sel!(selectNextTab:),
 379            select_next_tab as extern "C" fn(&Object, Sel, id),
 380        );
 381
 382        decl.add_method(
 383            sel!(selectPreviousTab:),
 384            select_previous_tab as extern "C" fn(&Object, Sel, id),
 385        );
 386
 387        decl.add_method(
 388            sel!(toggleTabBar:),
 389            toggle_tab_bar as extern "C" fn(&Object, Sel, id),
 390        );
 391
 392        decl.register()
 393    }
 394}
 395
 396struct MacWindowState {
 397    handle: AnyWindowHandle,
 398    executor: ForegroundExecutor,
 399    native_window: id,
 400    native_view: NonNull<Object>,
 401    blurred_view: Option<id>,
 402    display_link: Option<DisplayLink>,
 403    renderer: renderer::Renderer,
 404    request_frame_callback: Option<Box<dyn FnMut(RequestFrameOptions)>>,
 405    event_callback: Option<Box<dyn FnMut(PlatformInput) -> crate::DispatchEventResult>>,
 406    activate_callback: Option<Box<dyn FnMut(bool)>>,
 407    resize_callback: Option<Box<dyn FnMut(Size<Pixels>, f32)>>,
 408    moved_callback: Option<Box<dyn FnMut()>>,
 409    should_close_callback: Option<Box<dyn FnMut() -> bool>>,
 410    close_callback: Option<Box<dyn FnOnce()>>,
 411    appearance_changed_callback: Option<Box<dyn FnMut()>>,
 412    input_handler: Option<PlatformInputHandler>,
 413    last_key_equivalent: Option<KeyDownEvent>,
 414    synthetic_drag_counter: usize,
 415    traffic_light_position: Option<Point<Pixels>>,
 416    transparent_titlebar: bool,
 417    previous_modifiers_changed_event: Option<PlatformInput>,
 418    keystroke_for_do_command: Option<Keystroke>,
 419    do_command_handled: Option<bool>,
 420    external_files_dragged: bool,
 421    // Whether the next left-mouse click is also the focusing click.
 422    first_mouse: bool,
 423    fullscreen_restore_bounds: Bounds<Pixels>,
 424    move_tab_to_new_window_callback: Option<Box<dyn FnMut()>>,
 425    merge_all_windows_callback: Option<Box<dyn FnMut()>>,
 426    select_next_tab_callback: Option<Box<dyn FnMut()>>,
 427    select_previous_tab_callback: Option<Box<dyn FnMut()>>,
 428    toggle_tab_bar_callback: Option<Box<dyn FnMut()>>,
 429    activated_least_once: bool,
 430}
 431
 432impl MacWindowState {
 433    fn move_traffic_light(&self) {
 434        if let Some(traffic_light_position) = self.traffic_light_position {
 435            if self.is_fullscreen() {
 436                // Moving traffic lights while fullscreen doesn't work,
 437                // see https://github.com/zed-industries/zed/issues/4712
 438                return;
 439            }
 440
 441            let titlebar_height = self.titlebar_height();
 442
 443            unsafe {
 444                let close_button: id = msg_send![
 445                    self.native_window,
 446                    standardWindowButton: NSWindowButton::NSWindowCloseButton
 447                ];
 448                let min_button: id = msg_send![
 449                    self.native_window,
 450                    standardWindowButton: NSWindowButton::NSWindowMiniaturizeButton
 451                ];
 452                let zoom_button: id = msg_send![
 453                    self.native_window,
 454                    standardWindowButton: NSWindowButton::NSWindowZoomButton
 455                ];
 456
 457                let mut close_button_frame: CGRect = msg_send![close_button, frame];
 458                let mut min_button_frame: CGRect = msg_send![min_button, frame];
 459                let mut zoom_button_frame: CGRect = msg_send![zoom_button, frame];
 460                let mut origin = point(
 461                    traffic_light_position.x,
 462                    titlebar_height
 463                        - traffic_light_position.y
 464                        - px(close_button_frame.size.height as f32),
 465                );
 466                let button_spacing =
 467                    px((min_button_frame.origin.x - close_button_frame.origin.x) as f32);
 468
 469                close_button_frame.origin = CGPoint::new(origin.x.into(), origin.y.into());
 470                let _: () = msg_send![close_button, setFrame: close_button_frame];
 471                origin.x += button_spacing;
 472
 473                min_button_frame.origin = CGPoint::new(origin.x.into(), origin.y.into());
 474                let _: () = msg_send![min_button, setFrame: min_button_frame];
 475                origin.x += button_spacing;
 476
 477                zoom_button_frame.origin = CGPoint::new(origin.x.into(), origin.y.into());
 478                let _: () = msg_send![zoom_button, setFrame: zoom_button_frame];
 479                origin.x += button_spacing;
 480            }
 481        }
 482    }
 483
 484    fn start_display_link(&mut self) {
 485        self.stop_display_link();
 486        unsafe {
 487            if !self
 488                .native_window
 489                .occlusionState()
 490                .contains(NSWindowOcclusionState::NSWindowOcclusionStateVisible)
 491            {
 492                return;
 493            }
 494        }
 495        let display_id = unsafe { display_id_for_screen(self.native_window.screen()) };
 496        if let Some(mut display_link) =
 497            DisplayLink::new(display_id, self.native_view.as_ptr() as *mut c_void, step).log_err()
 498        {
 499            display_link.start().log_err();
 500            self.display_link = Some(display_link);
 501        }
 502    }
 503
 504    fn stop_display_link(&mut self) {
 505        self.display_link = None;
 506    }
 507
 508    fn is_maximized(&self) -> bool {
 509        unsafe {
 510            let bounds = self.bounds();
 511            let screen_size = self.native_window.screen().visibleFrame().into();
 512            bounds.size == screen_size
 513        }
 514    }
 515
 516    fn is_fullscreen(&self) -> bool {
 517        unsafe {
 518            let style_mask = self.native_window.styleMask();
 519            style_mask.contains(NSWindowStyleMask::NSFullScreenWindowMask)
 520        }
 521    }
 522
 523    fn bounds(&self) -> Bounds<Pixels> {
 524        let mut window_frame = unsafe { NSWindow::frame(self.native_window) };
 525        let screen = unsafe { NSWindow::screen(self.native_window) };
 526        if screen == nil {
 527            return Bounds::new(point(px(0.), px(0.)), crate::DEFAULT_WINDOW_SIZE);
 528        }
 529        let screen_frame = unsafe { NSScreen::frame(screen) };
 530
 531        // Flip the y coordinate to be top-left origin
 532        window_frame.origin.y =
 533            screen_frame.size.height - window_frame.origin.y - window_frame.size.height;
 534
 535        Bounds::new(
 536            point(
 537                px((window_frame.origin.x - screen_frame.origin.x) as f32),
 538                px((window_frame.origin.y + screen_frame.origin.y) as f32),
 539            ),
 540            size(
 541                px(window_frame.size.width as f32),
 542                px(window_frame.size.height as f32),
 543            ),
 544        )
 545    }
 546
 547    fn content_size(&self) -> Size<Pixels> {
 548        let NSSize { width, height, .. } =
 549            unsafe { NSView::frame(self.native_window.contentView()) }.size;
 550        size(px(width as f32), px(height as f32))
 551    }
 552
 553    fn scale_factor(&self) -> f32 {
 554        get_scale_factor(self.native_window)
 555    }
 556
 557    fn titlebar_height(&self) -> Pixels {
 558        unsafe {
 559            let frame = NSWindow::frame(self.native_window);
 560            let content_layout_rect: CGRect = msg_send![self.native_window, contentLayoutRect];
 561            px((frame.size.height - content_layout_rect.size.height) as f32)
 562        }
 563    }
 564
 565    fn window_bounds(&self) -> WindowBounds {
 566        if self.is_fullscreen() {
 567            WindowBounds::Fullscreen(self.fullscreen_restore_bounds)
 568        } else {
 569            WindowBounds::Windowed(self.bounds())
 570        }
 571    }
 572}
 573
 574unsafe impl Send for MacWindowState {}
 575
 576pub(crate) struct MacWindow(Arc<Mutex<MacWindowState>>);
 577
 578impl MacWindow {
 579    pub fn open(
 580        handle: AnyWindowHandle,
 581        WindowParams {
 582            bounds,
 583            titlebar,
 584            kind,
 585            is_movable,
 586            is_resizable,
 587            is_minimizable,
 588            focus,
 589            show,
 590            display_id,
 591            window_min_size,
 592            tabbing_identifier,
 593        }: WindowParams,
 594        executor: ForegroundExecutor,
 595        renderer_context: renderer::Context,
 596    ) -> Self {
 597        unsafe {
 598            let pool = NSAutoreleasePool::new(nil);
 599
 600            let allows_automatic_window_tabbing = tabbing_identifier.is_some();
 601            if allows_automatic_window_tabbing {
 602                let () = msg_send![class!(NSWindow), setAllowsAutomaticWindowTabbing: YES];
 603            } else {
 604                let () = msg_send![class!(NSWindow), setAllowsAutomaticWindowTabbing: NO];
 605            }
 606
 607            let mut style_mask;
 608            if let Some(titlebar) = titlebar.as_ref() {
 609                style_mask =
 610                    NSWindowStyleMask::NSClosableWindowMask | NSWindowStyleMask::NSTitledWindowMask;
 611
 612                if is_resizable {
 613                    style_mask |= NSWindowStyleMask::NSResizableWindowMask;
 614                }
 615
 616                if is_minimizable {
 617                    style_mask |= NSWindowStyleMask::NSMiniaturizableWindowMask;
 618                }
 619
 620                if titlebar.appears_transparent {
 621                    style_mask |= NSWindowStyleMask::NSFullSizeContentViewWindowMask;
 622                }
 623            } else {
 624                style_mask = NSWindowStyleMask::NSTitledWindowMask
 625                    | NSWindowStyleMask::NSFullSizeContentViewWindowMask;
 626            }
 627
 628            let native_window: id = match kind {
 629                WindowKind::Normal | WindowKind::Floating => msg_send![WINDOW_CLASS, alloc],
 630                WindowKind::PopUp => {
 631                    style_mask |= NSWindowStyleMaskNonactivatingPanel;
 632                    msg_send![PANEL_CLASS, alloc]
 633                }
 634            };
 635
 636            let display = display_id
 637                .and_then(MacDisplay::find_by_id)
 638                .unwrap_or_else(MacDisplay::primary);
 639
 640            let mut target_screen = nil;
 641            let mut screen_frame = None;
 642
 643            let screens = NSScreen::screens(nil);
 644            let count: u64 = cocoa::foundation::NSArray::count(screens);
 645            for i in 0..count {
 646                let screen = cocoa::foundation::NSArray::objectAtIndex(screens, i);
 647                let frame = NSScreen::frame(screen);
 648                let display_id = display_id_for_screen(screen);
 649                if display_id == display.0 {
 650                    screen_frame = Some(frame);
 651                    target_screen = screen;
 652                }
 653            }
 654
 655            let screen_frame = screen_frame.unwrap_or_else(|| {
 656                let screen = NSScreen::mainScreen(nil);
 657                target_screen = screen;
 658                NSScreen::frame(screen)
 659            });
 660
 661            let window_rect = NSRect::new(
 662                NSPoint::new(
 663                    screen_frame.origin.x + bounds.origin.x.0 as f64,
 664                    screen_frame.origin.y
 665                        + (display.bounds().size.height - bounds.origin.y).0 as f64,
 666                ),
 667                NSSize::new(bounds.size.width.0 as f64, bounds.size.height.0 as f64),
 668            );
 669
 670            let native_window = native_window.initWithContentRect_styleMask_backing_defer_screen_(
 671                window_rect,
 672                style_mask,
 673                NSBackingStoreBuffered,
 674                NO,
 675                target_screen,
 676            );
 677            assert!(!native_window.is_null());
 678            let () = msg_send![
 679                native_window,
 680                registerForDraggedTypes:
 681                    NSArray::arrayWithObject(nil, NSFilenamesPboardType)
 682            ];
 683            let () = msg_send![
 684                native_window,
 685                setReleasedWhenClosed: NO
 686            ];
 687
 688            let content_view = native_window.contentView();
 689            let native_view: id = msg_send![VIEW_CLASS, alloc];
 690            let native_view = NSView::initWithFrame_(native_view, NSView::bounds(content_view));
 691            assert!(!native_view.is_null());
 692
 693            let mut window = Self(Arc::new(Mutex::new(MacWindowState {
 694                handle,
 695                executor,
 696                native_window,
 697                native_view: NonNull::new_unchecked(native_view),
 698                blurred_view: None,
 699                display_link: None,
 700                renderer: renderer::new_renderer(
 701                    renderer_context,
 702                    native_window as *mut _,
 703                    native_view as *mut _,
 704                    bounds.size.map(|pixels| pixels.0),
 705                    false,
 706                ),
 707                request_frame_callback: None,
 708                event_callback: None,
 709                activate_callback: None,
 710                resize_callback: None,
 711                moved_callback: None,
 712                should_close_callback: None,
 713                close_callback: None,
 714                appearance_changed_callback: None,
 715                input_handler: None,
 716                last_key_equivalent: None,
 717                synthetic_drag_counter: 0,
 718                traffic_light_position: titlebar
 719                    .as_ref()
 720                    .and_then(|titlebar| titlebar.traffic_light_position),
 721                transparent_titlebar: titlebar
 722                    .as_ref()
 723                    .is_none_or(|titlebar| titlebar.appears_transparent),
 724                previous_modifiers_changed_event: None,
 725                keystroke_for_do_command: None,
 726                do_command_handled: None,
 727                external_files_dragged: false,
 728                first_mouse: false,
 729                fullscreen_restore_bounds: Bounds::default(),
 730                move_tab_to_new_window_callback: None,
 731                merge_all_windows_callback: None,
 732                select_next_tab_callback: None,
 733                select_previous_tab_callback: None,
 734                toggle_tab_bar_callback: None,
 735                activated_least_once: false,
 736            })));
 737
 738            (*native_window).set_ivar(
 739                WINDOW_STATE_IVAR,
 740                Arc::into_raw(window.0.clone()) as *const c_void,
 741            );
 742            native_window.setDelegate_(native_window);
 743            (*native_view).set_ivar(
 744                WINDOW_STATE_IVAR,
 745                Arc::into_raw(window.0.clone()) as *const c_void,
 746            );
 747
 748            if let Some(title) = titlebar
 749                .as_ref()
 750                .and_then(|t| t.title.as_ref().map(AsRef::as_ref))
 751            {
 752                window.set_title(title);
 753            }
 754
 755            native_window.setMovable_(is_movable as BOOL);
 756
 757            if let Some(window_min_size) = window_min_size {
 758                native_window.setContentMinSize_(NSSize {
 759                    width: window_min_size.width.to_f64(),
 760                    height: window_min_size.height.to_f64(),
 761                });
 762            }
 763
 764            if titlebar.is_none_or(|titlebar| titlebar.appears_transparent) {
 765                native_window.setTitlebarAppearsTransparent_(YES);
 766                native_window.setTitleVisibility_(NSWindowTitleVisibility::NSWindowTitleHidden);
 767            }
 768
 769            native_view.setAutoresizingMask_(NSViewWidthSizable | NSViewHeightSizable);
 770            native_view.setWantsBestResolutionOpenGLSurface_(YES);
 771
 772            // From winit crate: On Mojave, views automatically become layer-backed shortly after
 773            // being added to a native_window. Changing the layer-backedness of a view breaks the
 774            // association between the view and its associated OpenGL context. To work around this,
 775            // on we explicitly make the view layer-backed up front so that AppKit doesn't do it
 776            // itself and break the association with its context.
 777            native_view.setWantsLayer(YES);
 778            let _: () = msg_send![
 779            native_view,
 780            setLayerContentsRedrawPolicy: NSViewLayerContentsRedrawDuringViewResize
 781            ];
 782
 783            content_view.addSubview_(native_view.autorelease());
 784            native_window.makeFirstResponder_(native_view);
 785
 786            match kind {
 787                WindowKind::Normal | WindowKind::Floating => {
 788                    native_window.setLevel_(NSNormalWindowLevel);
 789                    native_window.setAcceptsMouseMovedEvents_(YES);
 790
 791                    if let Some(tabbing_identifier) = tabbing_identifier {
 792                        let tabbing_id = ns_string(tabbing_identifier.as_str());
 793                        let _: () = msg_send![native_window, setTabbingIdentifier: tabbing_id];
 794                    } else {
 795                        let _: () = msg_send![native_window, setTabbingIdentifier:nil];
 796                    }
 797                }
 798                WindowKind::PopUp => {
 799                    // Use a tracking area to allow receiving MouseMoved events even when
 800                    // the window or application aren't active, which is often the case
 801                    // e.g. for notification windows.
 802                    let tracking_area: id = msg_send![class!(NSTrackingArea), alloc];
 803                    let _: () = msg_send![
 804                        tracking_area,
 805                        initWithRect: NSRect::new(NSPoint::new(0., 0.), NSSize::new(0., 0.))
 806                        options: NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingActiveAlways | NSTrackingInVisibleRect
 807                        owner: native_view
 808                        userInfo: nil
 809                    ];
 810                    let _: () =
 811                        msg_send![native_view, addTrackingArea: tracking_area.autorelease()];
 812
 813                    native_window.setLevel_(NSPopUpWindowLevel);
 814                    let _: () = msg_send![
 815                        native_window,
 816                        setAnimationBehavior: NSWindowAnimationBehaviorUtilityWindow
 817                    ];
 818                    native_window.setCollectionBehavior_(
 819                        NSWindowCollectionBehavior::NSWindowCollectionBehaviorCanJoinAllSpaces |
 820                        NSWindowCollectionBehavior::NSWindowCollectionBehaviorFullScreenAuxiliary
 821                    );
 822                }
 823            }
 824
 825            let app = NSApplication::sharedApplication(nil);
 826            let main_window: id = msg_send![app, mainWindow];
 827            if allows_automatic_window_tabbing
 828                && !main_window.is_null()
 829                && main_window != native_window
 830            {
 831                let main_window_is_fullscreen = main_window
 832                    .styleMask()
 833                    .contains(NSWindowStyleMask::NSFullScreenWindowMask);
 834                let user_tabbing_preference = Self::get_user_tabbing_preference()
 835                    .unwrap_or(UserTabbingPreference::InFullScreen);
 836                let should_add_as_tab = user_tabbing_preference == UserTabbingPreference::Always
 837                    || user_tabbing_preference == UserTabbingPreference::InFullScreen
 838                        && main_window_is_fullscreen;
 839
 840                if should_add_as_tab {
 841                    let main_window_can_tab: BOOL =
 842                        msg_send![main_window, respondsToSelector: sel!(addTabbedWindow:ordered:)];
 843                    let main_window_visible: BOOL = msg_send![main_window, isVisible];
 844
 845                    if main_window_can_tab == YES && main_window_visible == YES {
 846                        let _: () = msg_send![main_window, addTabbedWindow: native_window ordered: NSWindowOrderingMode::NSWindowAbove];
 847
 848                        // Ensure the window is visible immediately after adding the tab, since the tab bar is updated with a new entry at this point.
 849                        // Note: Calling orderFront here can break fullscreen mode (makes fullscreen windows exit fullscreen), so only do this if the main window is not fullscreen.
 850                        if !main_window_is_fullscreen {
 851                            let _: () = msg_send![native_window, orderFront: nil];
 852                        }
 853                    }
 854                }
 855            }
 856
 857            if focus && show {
 858                native_window.makeKeyAndOrderFront_(nil);
 859            } else if show {
 860                native_window.orderFront_(nil);
 861            }
 862
 863            // Set the initial position of the window to the specified origin.
 864            // Although we already specified the position using `initWithContentRect_styleMask_backing_defer_screen_`,
 865            // the window position might be incorrect if the main screen (the screen that contains the window that has focus)
 866            //  is different from the primary screen.
 867            NSWindow::setFrameTopLeftPoint_(native_window, window_rect.origin);
 868            window.0.lock().move_traffic_light();
 869
 870            pool.drain();
 871
 872            window
 873        }
 874    }
 875
 876    pub fn active_window() -> Option<AnyWindowHandle> {
 877        unsafe {
 878            let app = NSApplication::sharedApplication(nil);
 879            let main_window: id = msg_send![app, mainWindow];
 880            if main_window.is_null() {
 881                return None;
 882            }
 883
 884            if msg_send![main_window, isKindOfClass: WINDOW_CLASS] {
 885                let handle = get_window_state(&*main_window).lock().handle;
 886                Some(handle)
 887            } else {
 888                None
 889            }
 890        }
 891    }
 892
 893    pub fn ordered_windows() -> Vec<AnyWindowHandle> {
 894        unsafe {
 895            let app = NSApplication::sharedApplication(nil);
 896            let windows: id = msg_send![app, orderedWindows];
 897            let count: NSUInteger = msg_send![windows, count];
 898
 899            let mut window_handles = Vec::new();
 900            for i in 0..count {
 901                let window: id = msg_send![windows, objectAtIndex:i];
 902                if msg_send![window, isKindOfClass: WINDOW_CLASS] {
 903                    let handle = get_window_state(&*window).lock().handle;
 904                    window_handles.push(handle);
 905                }
 906            }
 907
 908            window_handles
 909        }
 910    }
 911
 912    pub fn get_user_tabbing_preference() -> Option<UserTabbingPreference> {
 913        unsafe {
 914            let defaults: id = NSUserDefaults::standardUserDefaults();
 915            let domain = ns_string("NSGlobalDomain");
 916            let key = ns_string("AppleWindowTabbingMode");
 917
 918            let dict: id = msg_send![defaults, persistentDomainForName: domain];
 919            let value: id = if !dict.is_null() {
 920                msg_send![dict, objectForKey: key]
 921            } else {
 922                nil
 923            };
 924
 925            let value_str = if !value.is_null() {
 926                CStr::from_ptr(NSString::UTF8String(value)).to_string_lossy()
 927            } else {
 928                "".into()
 929            };
 930
 931            match value_str.as_ref() {
 932                "manual" => Some(UserTabbingPreference::Never),
 933                "always" => Some(UserTabbingPreference::Always),
 934                _ => Some(UserTabbingPreference::InFullScreen),
 935            }
 936        }
 937    }
 938
 939    /// Returns the CGWindowID (NSWindow's windowNumber) for this window.
 940    /// This can be used for ScreenCaptureKit window capture.
 941    #[cfg(any(test, feature = "test-support"))]
 942    pub fn window_number(&self) -> u32 {
 943        let this = self.0.lock();
 944        unsafe { this.native_window.windowNumber() as u32 }
 945    }
 946}
 947
 948impl Drop for MacWindow {
 949    fn drop(&mut self) {
 950        let mut this = self.0.lock();
 951        this.renderer.destroy();
 952        let window = this.native_window;
 953        this.display_link.take();
 954        unsafe {
 955            this.native_window.setDelegate_(nil);
 956        }
 957        this.input_handler.take();
 958        this.executor
 959            .spawn(async move {
 960                unsafe {
 961                    window.close();
 962                    window.autorelease();
 963                }
 964            })
 965            .detach();
 966    }
 967}
 968
 969impl PlatformWindow for MacWindow {
 970    fn bounds(&self) -> Bounds<Pixels> {
 971        self.0.as_ref().lock().bounds()
 972    }
 973
 974    fn window_bounds(&self) -> WindowBounds {
 975        self.0.as_ref().lock().window_bounds()
 976    }
 977
 978    fn is_maximized(&self) -> bool {
 979        self.0.as_ref().lock().is_maximized()
 980    }
 981
 982    fn content_size(&self) -> Size<Pixels> {
 983        self.0.as_ref().lock().content_size()
 984    }
 985
 986    fn resize(&mut self, size: Size<Pixels>) {
 987        let this = self.0.lock();
 988        let window = this.native_window;
 989        this.executor
 990            .spawn(async move {
 991                unsafe {
 992                    window.setContentSize_(NSSize {
 993                        width: size.width.0 as f64,
 994                        height: size.height.0 as f64,
 995                    });
 996                }
 997            })
 998            .detach();
 999    }
1000
1001    fn merge_all_windows(&self) {
1002        let native_window = self.0.lock().native_window;
1003        unsafe extern "C" fn merge_windows_async(context: *mut std::ffi::c_void) {
1004            let native_window = context as id;
1005            let _: () = msg_send![native_window, mergeAllWindows:nil];
1006        }
1007
1008        unsafe {
1009            dispatch_async_f(
1010                dispatch_get_main_queue(),
1011                native_window as *mut std::ffi::c_void,
1012                Some(merge_windows_async),
1013            );
1014        }
1015    }
1016
1017    fn move_tab_to_new_window(&self) {
1018        let native_window = self.0.lock().native_window;
1019        unsafe extern "C" fn move_tab_async(context: *mut std::ffi::c_void) {
1020            let native_window = context as id;
1021            let _: () = msg_send![native_window, moveTabToNewWindow:nil];
1022            let _: () = msg_send![native_window, makeKeyAndOrderFront: nil];
1023        }
1024
1025        unsafe {
1026            dispatch_async_f(
1027                dispatch_get_main_queue(),
1028                native_window as *mut std::ffi::c_void,
1029                Some(move_tab_async),
1030            );
1031        }
1032    }
1033
1034    fn toggle_window_tab_overview(&self) {
1035        let native_window = self.0.lock().native_window;
1036        unsafe {
1037            let _: () = msg_send![native_window, toggleTabOverview:nil];
1038        }
1039    }
1040
1041    fn set_tabbing_identifier(&self, tabbing_identifier: Option<String>) {
1042        let native_window = self.0.lock().native_window;
1043        unsafe {
1044            let allows_automatic_window_tabbing = tabbing_identifier.is_some();
1045            if allows_automatic_window_tabbing {
1046                let () = msg_send![class!(NSWindow), setAllowsAutomaticWindowTabbing: YES];
1047            } else {
1048                let () = msg_send![class!(NSWindow), setAllowsAutomaticWindowTabbing: NO];
1049            }
1050
1051            if let Some(tabbing_identifier) = tabbing_identifier {
1052                let tabbing_id = ns_string(tabbing_identifier.as_str());
1053                let _: () = msg_send![native_window, setTabbingIdentifier: tabbing_id];
1054            } else {
1055                let _: () = msg_send![native_window, setTabbingIdentifier:nil];
1056            }
1057        }
1058    }
1059
1060    fn scale_factor(&self) -> f32 {
1061        self.0.as_ref().lock().scale_factor()
1062    }
1063
1064    fn appearance(&self) -> WindowAppearance {
1065        unsafe {
1066            let appearance: id = msg_send![self.0.lock().native_window, effectiveAppearance];
1067            WindowAppearance::from_native(appearance)
1068        }
1069    }
1070
1071    fn display(&self) -> Option<Rc<dyn PlatformDisplay>> {
1072        unsafe {
1073            let screen = self.0.lock().native_window.screen();
1074            if screen.is_null() {
1075                return None;
1076            }
1077            let device_description: id = msg_send![screen, deviceDescription];
1078            let screen_number: id =
1079                NSDictionary::valueForKey_(device_description, ns_string("NSScreenNumber"));
1080
1081            let screen_number: u32 = msg_send![screen_number, unsignedIntValue];
1082
1083            Some(Rc::new(MacDisplay(screen_number)))
1084        }
1085    }
1086
1087    fn mouse_position(&self) -> Point<Pixels> {
1088        let position = unsafe {
1089            self.0
1090                .lock()
1091                .native_window
1092                .mouseLocationOutsideOfEventStream()
1093        };
1094        convert_mouse_position(position, self.content_size().height)
1095    }
1096
1097    fn modifiers(&self) -> Modifiers {
1098        unsafe {
1099            let modifiers: NSEventModifierFlags = msg_send![class!(NSEvent), modifierFlags];
1100
1101            let control = modifiers.contains(NSEventModifierFlags::NSControlKeyMask);
1102            let alt = modifiers.contains(NSEventModifierFlags::NSAlternateKeyMask);
1103            let shift = modifiers.contains(NSEventModifierFlags::NSShiftKeyMask);
1104            let command = modifiers.contains(NSEventModifierFlags::NSCommandKeyMask);
1105            let function = modifiers.contains(NSEventModifierFlags::NSFunctionKeyMask);
1106
1107            Modifiers {
1108                control,
1109                alt,
1110                shift,
1111                platform: command,
1112                function,
1113            }
1114        }
1115    }
1116
1117    fn capslock(&self) -> Capslock {
1118        unsafe {
1119            let modifiers: NSEventModifierFlags = msg_send![class!(NSEvent), modifierFlags];
1120
1121            Capslock {
1122                on: modifiers.contains(NSEventModifierFlags::NSAlphaShiftKeyMask),
1123            }
1124        }
1125    }
1126
1127    fn set_input_handler(&mut self, input_handler: PlatformInputHandler) {
1128        self.0.as_ref().lock().input_handler = Some(input_handler);
1129    }
1130
1131    fn take_input_handler(&mut self) -> Option<PlatformInputHandler> {
1132        self.0.as_ref().lock().input_handler.take()
1133    }
1134
1135    fn prompt(
1136        &self,
1137        level: PromptLevel,
1138        msg: &str,
1139        detail: Option<&str>,
1140        answers: &[PromptButton],
1141    ) -> Option<oneshot::Receiver<usize>> {
1142        // macOs applies overrides to modal window buttons after they are added.
1143        // Two most important for this logic are:
1144        // * Buttons with "Cancel" title will be displayed as the last buttons in the modal
1145        // * Last button added to the modal via `addButtonWithTitle` stays focused
1146        // * Focused buttons react on "space"/" " keypresses
1147        // * Usage of `keyEquivalent`, `makeFirstResponder` or `setInitialFirstResponder` does not change the focus
1148        //
1149        // See also https://developer.apple.com/documentation/appkit/nsalert/1524532-addbuttonwithtitle#discussion
1150        // ```
1151        // By default, the first button has a key equivalent of Return,
1152        // any button with a title of “Cancel” has a key equivalent of Escape,
1153        // and any button with the title “Don’t Save” has a key equivalent of Command-D (but only if it’s not the first button).
1154        // ```
1155        //
1156        // To avoid situations when the last element added is "Cancel" and it gets the focus
1157        // (hence stealing both ESC and Space shortcuts), we find and add one non-Cancel button
1158        // last, so it gets focus and a Space shortcut.
1159        // This way, "Save this file? Yes/No/Cancel"-ish modals will get all three buttons mapped with a key.
1160        let latest_non_cancel_label = answers
1161            .iter()
1162            .enumerate()
1163            .rev()
1164            .find(|(_, label)| !label.is_cancel())
1165            .filter(|&(label_index, _)| label_index > 0);
1166
1167        unsafe {
1168            let alert: id = msg_send![class!(NSAlert), alloc];
1169            let alert: id = msg_send![alert, init];
1170            let alert_style = match level {
1171                PromptLevel::Info => 1,
1172                PromptLevel::Warning => 0,
1173                PromptLevel::Critical => 2,
1174            };
1175            let _: () = msg_send![alert, setAlertStyle: alert_style];
1176            let _: () = msg_send![alert, setMessageText: ns_string(msg)];
1177            if let Some(detail) = detail {
1178                let _: () = msg_send![alert, setInformativeText: ns_string(detail)];
1179            }
1180
1181            for (ix, answer) in answers
1182                .iter()
1183                .enumerate()
1184                .filter(|&(ix, _)| Some(ix) != latest_non_cancel_label.map(|(ix, _)| ix))
1185            {
1186                let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer.label())];
1187                let _: () = msg_send![button, setTag: ix as NSInteger];
1188
1189                if answer.is_cancel() {
1190                    // Bind Escape Key to Cancel Button
1191                    if let Some(key) = std::char::from_u32(super::events::ESCAPE_KEY as u32) {
1192                        let _: () =
1193                            msg_send![button, setKeyEquivalent: ns_string(&key.to_string())];
1194                    }
1195                }
1196            }
1197            if let Some((ix, answer)) = latest_non_cancel_label {
1198                let button: id = msg_send![alert, addButtonWithTitle: ns_string(answer.label())];
1199                let _: () = msg_send![button, setTag: ix as NSInteger];
1200            }
1201
1202            let (done_tx, done_rx) = oneshot::channel();
1203            let done_tx = Cell::new(Some(done_tx));
1204            let block = ConcreteBlock::new(move |answer: NSInteger| {
1205                let _: () = msg_send![alert, release];
1206                if let Some(done_tx) = done_tx.take() {
1207                    let _ = done_tx.send(answer.try_into().unwrap());
1208                }
1209            });
1210            let block = block.copy();
1211            let native_window = self.0.lock().native_window;
1212            let executor = self.0.lock().executor.clone();
1213            executor
1214                .spawn(async move {
1215                    let _: () = msg_send![
1216                        alert,
1217                        beginSheetModalForWindow: native_window
1218                        completionHandler: block
1219                    ];
1220                })
1221                .detach();
1222
1223            Some(done_rx)
1224        }
1225    }
1226
1227    fn activate(&self) {
1228        let window = self.0.lock().native_window;
1229        let executor = self.0.lock().executor.clone();
1230        executor
1231            .spawn(async move {
1232                unsafe {
1233                    let _: () = msg_send![window, makeKeyAndOrderFront: nil];
1234                }
1235            })
1236            .detach();
1237    }
1238
1239    fn is_active(&self) -> bool {
1240        unsafe { self.0.lock().native_window.isKeyWindow() == YES }
1241    }
1242
1243    // is_hovered is unused on macOS. See Window::is_window_hovered.
1244    fn is_hovered(&self) -> bool {
1245        false
1246    }
1247
1248    fn set_title(&mut self, title: &str) {
1249        unsafe {
1250            let app = NSApplication::sharedApplication(nil);
1251            let window = self.0.lock().native_window;
1252            let title = ns_string(title);
1253            let _: () = msg_send![app, changeWindowsItem:window title:title filename:false];
1254            let _: () = msg_send![window, setTitle: title];
1255            self.0.lock().move_traffic_light();
1256        }
1257    }
1258
1259    fn get_title(&self) -> String {
1260        unsafe {
1261            let title: id = msg_send![self.0.lock().native_window, title];
1262            if title.is_null() {
1263                "".to_string()
1264            } else {
1265                title.to_str().to_string()
1266            }
1267        }
1268    }
1269
1270    fn set_app_id(&mut self, _app_id: &str) {}
1271
1272    fn set_background_appearance(&self, background_appearance: WindowBackgroundAppearance) {
1273        let mut this = self.0.as_ref().lock();
1274
1275        let opaque = background_appearance == WindowBackgroundAppearance::Opaque;
1276        this.renderer.update_transparency(!opaque);
1277
1278        unsafe {
1279            this.native_window.setOpaque_(opaque as BOOL);
1280            let background_color = if opaque {
1281                NSColor::colorWithSRGBRed_green_blue_alpha_(nil, 0f64, 0f64, 0f64, 1f64)
1282            } else {
1283                // Not using `+[NSColor clearColor]` to avoid broken shadow.
1284                NSColor::colorWithSRGBRed_green_blue_alpha_(nil, 0f64, 0f64, 0f64, 0.0001)
1285            };
1286            this.native_window.setBackgroundColor_(background_color);
1287
1288            if NSAppKitVersionNumber < NSAppKitVersionNumber12_0 {
1289                // Whether `-[NSVisualEffectView respondsToSelector:@selector(_updateProxyLayer)]`.
1290                // On macOS Catalina/Big Sur `NSVisualEffectView` doesn’t own concrete sublayers
1291                // but uses a `CAProxyLayer`. Use the legacy WindowServer API.
1292                let blur_radius = if background_appearance == WindowBackgroundAppearance::Blurred {
1293                    80
1294                } else {
1295                    0
1296                };
1297
1298                let window_number = this.native_window.windowNumber();
1299                CGSSetWindowBackgroundBlurRadius(CGSMainConnectionID(), window_number, blur_radius);
1300            } else {
1301                // On newer macOS `NSVisualEffectView` manages the effect layer directly. Using it
1302                // could have a better performance (it downsamples the backdrop) and more control
1303                // over the effect layer.
1304                if background_appearance != WindowBackgroundAppearance::Blurred {
1305                    if let Some(blur_view) = this.blurred_view {
1306                        NSView::removeFromSuperview(blur_view);
1307                        this.blurred_view = None;
1308                    }
1309                } else if this.blurred_view.is_none() {
1310                    let content_view = this.native_window.contentView();
1311                    let frame = NSView::bounds(content_view);
1312                    let mut blur_view: id = msg_send![BLURRED_VIEW_CLASS, alloc];
1313                    blur_view = NSView::initWithFrame_(blur_view, frame);
1314                    blur_view.setAutoresizingMask_(NSViewWidthSizable | NSViewHeightSizable);
1315
1316                    let _: () = msg_send![
1317                        content_view,
1318                        addSubview: blur_view
1319                        positioned: NSWindowOrderingMode::NSWindowBelow
1320                        relativeTo: nil
1321                    ];
1322                    this.blurred_view = Some(blur_view.autorelease());
1323                }
1324            }
1325        }
1326    }
1327
1328    fn set_edited(&mut self, edited: bool) {
1329        unsafe {
1330            let window = self.0.lock().native_window;
1331            msg_send![window, setDocumentEdited: edited as BOOL]
1332        }
1333
1334        // Changing the document edited state resets the traffic light position,
1335        // so we have to move it again.
1336        self.0.lock().move_traffic_light();
1337    }
1338
1339    fn show_character_palette(&self) {
1340        let this = self.0.lock();
1341        let window = this.native_window;
1342        this.executor
1343            .spawn(async move {
1344                unsafe {
1345                    let app = NSApplication::sharedApplication(nil);
1346                    let _: () = msg_send![app, orderFrontCharacterPalette: window];
1347                }
1348            })
1349            .detach();
1350    }
1351
1352    fn minimize(&self) {
1353        let window = self.0.lock().native_window;
1354        unsafe {
1355            window.miniaturize_(nil);
1356        }
1357    }
1358
1359    fn zoom(&self) {
1360        let this = self.0.lock();
1361        let window = this.native_window;
1362        this.executor
1363            .spawn(async move {
1364                unsafe {
1365                    window.zoom_(nil);
1366                }
1367            })
1368            .detach();
1369    }
1370
1371    fn toggle_fullscreen(&self) {
1372        let this = self.0.lock();
1373        let window = this.native_window;
1374        this.executor
1375            .spawn(async move {
1376                unsafe {
1377                    window.toggleFullScreen_(nil);
1378                }
1379            })
1380            .detach();
1381    }
1382
1383    fn is_fullscreen(&self) -> bool {
1384        let this = self.0.lock();
1385        let window = this.native_window;
1386
1387        unsafe {
1388            window
1389                .styleMask()
1390                .contains(NSWindowStyleMask::NSFullScreenWindowMask)
1391        }
1392    }
1393
1394    fn on_request_frame(&self, callback: Box<dyn FnMut(RequestFrameOptions)>) {
1395        self.0.as_ref().lock().request_frame_callback = Some(callback);
1396    }
1397
1398    fn on_input(&self, callback: Box<dyn FnMut(PlatformInput) -> crate::DispatchEventResult>) {
1399        self.0.as_ref().lock().event_callback = Some(callback);
1400    }
1401
1402    fn on_active_status_change(&self, callback: Box<dyn FnMut(bool)>) {
1403        self.0.as_ref().lock().activate_callback = Some(callback);
1404    }
1405
1406    fn on_hover_status_change(&self, _: Box<dyn FnMut(bool)>) {}
1407
1408    fn on_resize(&self, callback: Box<dyn FnMut(Size<Pixels>, f32)>) {
1409        self.0.as_ref().lock().resize_callback = Some(callback);
1410    }
1411
1412    fn on_moved(&self, callback: Box<dyn FnMut()>) {
1413        self.0.as_ref().lock().moved_callback = Some(callback);
1414    }
1415
1416    fn on_should_close(&self, callback: Box<dyn FnMut() -> bool>) {
1417        self.0.as_ref().lock().should_close_callback = Some(callback);
1418    }
1419
1420    fn on_close(&self, callback: Box<dyn FnOnce()>) {
1421        self.0.as_ref().lock().close_callback = Some(callback);
1422    }
1423
1424    fn on_hit_test_window_control(&self, _callback: Box<dyn FnMut() -> Option<WindowControlArea>>) {
1425    }
1426
1427    fn on_appearance_changed(&self, callback: Box<dyn FnMut()>) {
1428        self.0.lock().appearance_changed_callback = Some(callback);
1429    }
1430
1431    fn tabbed_windows(&self) -> Option<Vec<SystemWindowTab>> {
1432        unsafe {
1433            let windows: id = msg_send![self.0.lock().native_window, tabbedWindows];
1434            if windows.is_null() {
1435                return None;
1436            }
1437
1438            let count: NSUInteger = msg_send![windows, count];
1439            let mut result = Vec::new();
1440            for i in 0..count {
1441                let window: id = msg_send![windows, objectAtIndex:i];
1442                if msg_send![window, isKindOfClass: WINDOW_CLASS] {
1443                    let handle = get_window_state(&*window).lock().handle;
1444                    let title: id = msg_send![window, title];
1445                    let title = SharedString::from(title.to_str().to_string());
1446
1447                    result.push(SystemWindowTab::new(title, handle));
1448                }
1449            }
1450
1451            Some(result)
1452        }
1453    }
1454
1455    fn tab_bar_visible(&self) -> bool {
1456        unsafe {
1457            let tab_group: id = msg_send![self.0.lock().native_window, tabGroup];
1458            if tab_group.is_null() {
1459                false
1460            } else {
1461                let tab_bar_visible: BOOL = msg_send![tab_group, isTabBarVisible];
1462                tab_bar_visible == YES
1463            }
1464        }
1465    }
1466
1467    fn on_move_tab_to_new_window(&self, callback: Box<dyn FnMut()>) {
1468        self.0.as_ref().lock().move_tab_to_new_window_callback = Some(callback);
1469    }
1470
1471    fn on_merge_all_windows(&self, callback: Box<dyn FnMut()>) {
1472        self.0.as_ref().lock().merge_all_windows_callback = Some(callback);
1473    }
1474
1475    fn on_select_next_tab(&self, callback: Box<dyn FnMut()>) {
1476        self.0.as_ref().lock().select_next_tab_callback = Some(callback);
1477    }
1478
1479    fn on_select_previous_tab(&self, callback: Box<dyn FnMut()>) {
1480        self.0.as_ref().lock().select_previous_tab_callback = Some(callback);
1481    }
1482
1483    fn on_toggle_tab_bar(&self, callback: Box<dyn FnMut()>) {
1484        self.0.as_ref().lock().toggle_tab_bar_callback = Some(callback);
1485    }
1486
1487    fn draw(&self, scene: &crate::Scene) {
1488        let mut this = self.0.lock();
1489        this.renderer.draw(scene);
1490    }
1491
1492    fn sprite_atlas(&self) -> Arc<dyn PlatformAtlas> {
1493        self.0.lock().renderer.sprite_atlas().clone()
1494    }
1495
1496    fn gpu_specs(&self) -> Option<crate::GpuSpecs> {
1497        None
1498    }
1499
1500    fn update_ime_position(&self, _bounds: Bounds<Pixels>) {
1501        let executor = self.0.lock().executor.clone();
1502        executor
1503            .spawn(async move {
1504                unsafe {
1505                    let input_context: id =
1506                        msg_send![class!(NSTextInputContext), currentInputContext];
1507                    if input_context.is_null() {
1508                        return;
1509                    }
1510                    let _: () = msg_send![input_context, invalidateCharacterCoordinates];
1511                }
1512            })
1513            .detach()
1514    }
1515
1516    fn titlebar_double_click(&self) {
1517        let this = self.0.lock();
1518        let window = this.native_window;
1519        this.executor
1520            .spawn(async move {
1521                unsafe {
1522                    let defaults: id = NSUserDefaults::standardUserDefaults();
1523                    let domain = ns_string("NSGlobalDomain");
1524                    let key = ns_string("AppleActionOnDoubleClick");
1525
1526                    let dict: id = msg_send![defaults, persistentDomainForName: domain];
1527                    let action: id = if !dict.is_null() {
1528                        msg_send![dict, objectForKey: key]
1529                    } else {
1530                        nil
1531                    };
1532
1533                    let action_str = if !action.is_null() {
1534                        CStr::from_ptr(NSString::UTF8String(action)).to_string_lossy()
1535                    } else {
1536                        "".into()
1537                    };
1538
1539                    match action_str.as_ref() {
1540                        "None" => {
1541                            // "Do Nothing" selected, so do no action
1542                        }
1543                        "Minimize" => {
1544                            window.miniaturize_(nil);
1545                        }
1546                        "Maximize" => {
1547                            window.zoom_(nil);
1548                        }
1549                        "Fill" => {
1550                            // There is no documented API for "Fill" action, so we'll just zoom the window
1551                            window.zoom_(nil);
1552                        }
1553                        _ => {
1554                            window.zoom_(nil);
1555                        }
1556                    }
1557                }
1558            })
1559            .detach();
1560    }
1561
1562    fn start_window_move(&self) {
1563        let this = self.0.lock();
1564        let window = this.native_window;
1565
1566        unsafe {
1567            let app = NSApplication::sharedApplication(nil);
1568            let mut event: id = msg_send![app, currentEvent];
1569            let _: () = msg_send![window, performWindowDragWithEvent: event];
1570        }
1571    }
1572
1573    #[cfg(any(test, feature = "test-support"))]
1574    fn native_window_id(&self) -> Option<u32> {
1575        Some(self.window_number())
1576    }
1577
1578    #[cfg(any(test, feature = "test-support"))]
1579    fn render_to_image(&self, scene: &crate::Scene) -> Result<RgbaImage> {
1580        let mut this = self.0.lock();
1581        this.renderer.render_to_image(scene)
1582    }
1583}
1584
1585impl rwh::HasWindowHandle for MacWindow {
1586    fn window_handle(&self) -> Result<rwh::WindowHandle<'_>, rwh::HandleError> {
1587        // SAFETY: The AppKitWindowHandle is a wrapper around a pointer to an NSView
1588        unsafe {
1589            Ok(rwh::WindowHandle::borrow_raw(rwh::RawWindowHandle::AppKit(
1590                rwh::AppKitWindowHandle::new(self.0.lock().native_view.cast()),
1591            )))
1592        }
1593    }
1594}
1595
1596impl rwh::HasDisplayHandle for MacWindow {
1597    fn display_handle(&self) -> Result<rwh::DisplayHandle<'_>, rwh::HandleError> {
1598        // SAFETY: This is a no-op on macOS
1599        unsafe {
1600            Ok(rwh::DisplayHandle::borrow_raw(
1601                rwh::AppKitDisplayHandle::new().into(),
1602            ))
1603        }
1604    }
1605}
1606
1607fn get_scale_factor(native_window: id) -> f32 {
1608    let factor = unsafe {
1609        let screen: id = msg_send![native_window, screen];
1610        if screen.is_null() {
1611            return 2.0;
1612        }
1613        NSScreen::backingScaleFactor(screen) as f32
1614    };
1615
1616    // We are not certain what triggers this, but it seems that sometimes
1617    // this method would return 0 (https://github.com/zed-industries/zed/issues/6412)
1618    // It seems most likely that this would happen if the window has no screen
1619    // (if it is off-screen), though we'd expect to see viewDidChangeBackingProperties before
1620    // it was rendered for real.
1621    // Regardless, attempt to avoid the issue here.
1622    if factor == 0.0 { 2. } else { factor }
1623}
1624
1625unsafe fn get_window_state(object: &Object) -> Arc<Mutex<MacWindowState>> {
1626    unsafe {
1627        let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
1628        let rc1 = Arc::from_raw(raw as *mut Mutex<MacWindowState>);
1629        let rc2 = rc1.clone();
1630        mem::forget(rc1);
1631        rc2
1632    }
1633}
1634
1635unsafe fn drop_window_state(object: &Object) {
1636    unsafe {
1637        let raw: *mut c_void = *object.get_ivar(WINDOW_STATE_IVAR);
1638        Arc::from_raw(raw as *mut Mutex<MacWindowState>);
1639    }
1640}
1641
1642extern "C" fn yes(_: &Object, _: Sel) -> BOOL {
1643    YES
1644}
1645
1646extern "C" fn dealloc_window(this: &Object, _: Sel) {
1647    unsafe {
1648        drop_window_state(this);
1649        let _: () = msg_send![super(this, class!(NSWindow)), dealloc];
1650    }
1651}
1652
1653extern "C" fn dealloc_view(this: &Object, _: Sel) {
1654    unsafe {
1655        drop_window_state(this);
1656        let _: () = msg_send![super(this, class!(NSView)), dealloc];
1657    }
1658}
1659
1660extern "C" fn handle_key_equivalent(this: &Object, _: Sel, native_event: id) -> BOOL {
1661    handle_key_event(this, native_event, true)
1662}
1663
1664extern "C" fn handle_key_down(this: &Object, _: Sel, native_event: id) {
1665    handle_key_event(this, native_event, false);
1666}
1667
1668extern "C" fn handle_key_up(this: &Object, _: Sel, native_event: id) {
1669    handle_key_event(this, native_event, false);
1670}
1671
1672// Things to test if you're modifying this method:
1673//  U.S. layout:
1674//   - The IME consumes characters like 'j' and 'k', which makes paging through `less` in
1675//     the terminal behave incorrectly by default. This behavior should be patched by our
1676//     IME integration
1677//   - `alt-t` should open the tasks menu
1678//   - In vim mode, this keybinding should work:
1679//     ```
1680//        {
1681//          "context": "Editor && vim_mode == insert",
1682//          "bindings": {"j j": "vim::NormalBefore"}
1683//        }
1684//     ```
1685//     and typing 'j k' in insert mode with this keybinding should insert the two characters
1686//  Brazilian layout:
1687//   - `" space` should create an unmarked quote
1688//   - `" backspace` should delete the marked quote
1689//   - `" "`should create an unmarked quote and a second marked quote
1690//   - `" up` should insert a quote, unmark it, and move up one line
1691//   - `" cmd-down` should insert a quote, unmark it, and move to the end of the file
1692//   - `cmd-ctrl-space` and clicking on an emoji should type it
1693//  Czech (QWERTY) layout:
1694//   - in vim mode `option-4`  should go to end of line (same as $)
1695//  Japanese (Romaji) layout:
1696//   - type `a i left down up enter enter` should create an unmarked text "愛"
1697extern "C" fn handle_key_event(this: &Object, native_event: id, key_equivalent: bool) -> BOOL {
1698    let window_state = unsafe { get_window_state(this) };
1699    let mut lock = window_state.as_ref().lock();
1700
1701    let window_height = lock.content_size().height;
1702    let event = unsafe { PlatformInput::from_native(native_event, Some(window_height)) };
1703
1704    let Some(event) = event else {
1705        return NO;
1706    };
1707
1708    let run_callback = |event: PlatformInput| -> BOOL {
1709        let mut callback = window_state.as_ref().lock().event_callback.take();
1710        let handled: BOOL = if let Some(callback) = callback.as_mut() {
1711            !callback(event).propagate as BOOL
1712        } else {
1713            NO
1714        };
1715        window_state.as_ref().lock().event_callback = callback;
1716        handled
1717    };
1718
1719    match event {
1720        PlatformInput::KeyDown(mut key_down_event) => {
1721            // For certain keystrokes, macOS will first dispatch a "key equivalent" event.
1722            // If that event isn't handled, it will then dispatch a "key down" event. GPUI
1723            // makes no distinction between these two types of events, so we need to ignore
1724            // the "key down" event if we've already just processed its "key equivalent" version.
1725            if key_equivalent {
1726                lock.last_key_equivalent = Some(key_down_event.clone());
1727            } else if lock.last_key_equivalent.take().as_ref() == Some(&key_down_event) {
1728                return NO;
1729            }
1730
1731            drop(lock);
1732
1733            let is_composing =
1734                with_input_handler(this, |input_handler| input_handler.marked_text_range())
1735                    .flatten()
1736                    .is_some();
1737
1738            // If we're composing, send the key to the input handler first;
1739            // otherwise we only send to the input handler if we don't have a matching binding.
1740            // The input handler may call `do_command_by_selector` if it doesn't know how to handle
1741            // a key. If it does so, it will return YES so we won't send the key twice.
1742            // We also do this for non-printing keys (like arrow keys and escape) as the IME menu
1743            // may need them even if there is no marked text;
1744            // however we skip keys with control or the input handler adds control-characters to the buffer.
1745            // and keys with function, as the input handler swallows them.
1746            if is_composing
1747                || (key_down_event.keystroke.key_char.is_none()
1748                    && !key_down_event.keystroke.modifiers.control
1749                    && !key_down_event.keystroke.modifiers.function)
1750            {
1751                {
1752                    let mut lock = window_state.as_ref().lock();
1753                    lock.keystroke_for_do_command = Some(key_down_event.keystroke.clone());
1754                    lock.do_command_handled.take();
1755                    drop(lock);
1756                }
1757
1758                let handled: BOOL = unsafe {
1759                    let input_context: id = msg_send![this, inputContext];
1760                    msg_send![input_context, handleEvent: native_event]
1761                };
1762                window_state.as_ref().lock().keystroke_for_do_command.take();
1763                if let Some(handled) = window_state.as_ref().lock().do_command_handled.take() {
1764                    return handled as BOOL;
1765                } else if handled == YES {
1766                    return YES;
1767                }
1768
1769                let handled = run_callback(PlatformInput::KeyDown(key_down_event));
1770                return handled;
1771            }
1772
1773            let handled = run_callback(PlatformInput::KeyDown(key_down_event.clone()));
1774            if handled == YES {
1775                return YES;
1776            }
1777
1778            if key_down_event.is_held
1779                && let Some(key_char) = key_down_event.keystroke.key_char.as_ref()
1780            {
1781                let handled = with_input_handler(this, |input_handler| {
1782                    if !input_handler.apple_press_and_hold_enabled() {
1783                        input_handler.replace_text_in_range(None, key_char);
1784                        return YES;
1785                    }
1786                    NO
1787                });
1788                if handled == Some(YES) {
1789                    return YES;
1790                }
1791            }
1792
1793            // Don't send key equivalents to the input handler if there are key modifiers other
1794            // than Function key, or macOS shortcuts like cmd-` will stop working.
1795            if key_equivalent && key_down_event.keystroke.modifiers != Modifiers::function() {
1796                return NO;
1797            }
1798
1799            unsafe {
1800                let input_context: id = msg_send![this, inputContext];
1801                msg_send![input_context, handleEvent: native_event]
1802            }
1803        }
1804
1805        PlatformInput::KeyUp(_) => {
1806            drop(lock);
1807            run_callback(event)
1808        }
1809
1810        _ => NO,
1811    }
1812}
1813
1814extern "C" fn handle_view_event(this: &Object, _: Sel, native_event: id) {
1815    let window_state = unsafe { get_window_state(this) };
1816    let weak_window_state = Arc::downgrade(&window_state);
1817    let mut lock = window_state.as_ref().lock();
1818    let window_height = lock.content_size().height;
1819    let event = unsafe { PlatformInput::from_native(native_event, Some(window_height)) };
1820
1821    if let Some(mut event) = event {
1822        match &mut event {
1823            PlatformInput::MouseDown(
1824                event @ MouseDownEvent {
1825                    button: MouseButton::Left,
1826                    modifiers: Modifiers { control: true, .. },
1827                    ..
1828                },
1829            ) => {
1830                // On mac, a ctrl-left click should be handled as a right click.
1831                *event = MouseDownEvent {
1832                    button: MouseButton::Right,
1833                    modifiers: Modifiers {
1834                        control: false,
1835                        ..event.modifiers
1836                    },
1837                    click_count: 1,
1838                    ..*event
1839                };
1840            }
1841
1842            // Handles focusing click.
1843            PlatformInput::MouseDown(
1844                event @ MouseDownEvent {
1845                    button: MouseButton::Left,
1846                    ..
1847                },
1848            ) if (lock.first_mouse) => {
1849                *event = MouseDownEvent {
1850                    first_mouse: true,
1851                    ..*event
1852                };
1853                lock.first_mouse = false;
1854            }
1855
1856            // Because we map a ctrl-left_down to a right_down -> right_up let's ignore
1857            // the ctrl-left_up to avoid having a mismatch in button down/up events if the
1858            // user is still holding ctrl when releasing the left mouse button
1859            PlatformInput::MouseUp(
1860                event @ MouseUpEvent {
1861                    button: MouseButton::Left,
1862                    modifiers: Modifiers { control: true, .. },
1863                    ..
1864                },
1865            ) => {
1866                *event = MouseUpEvent {
1867                    button: MouseButton::Right,
1868                    modifiers: Modifiers {
1869                        control: false,
1870                        ..event.modifiers
1871                    },
1872                    click_count: 1,
1873                    ..*event
1874                };
1875            }
1876
1877            _ => {}
1878        };
1879
1880        match &event {
1881            PlatformInput::MouseDown(_) => {
1882                drop(lock);
1883                unsafe {
1884                    let input_context: id = msg_send![this, inputContext];
1885                    msg_send![input_context, handleEvent: native_event]
1886                }
1887                lock = window_state.as_ref().lock();
1888            }
1889            PlatformInput::MouseMove(
1890                event @ MouseMoveEvent {
1891                    pressed_button: Some(_),
1892                    ..
1893                },
1894            ) => {
1895                // Synthetic drag is used for selecting long buffer contents while buffer is being scrolled.
1896                // External file drag and drop is able to emit its own synthetic mouse events which will conflict
1897                // with these ones.
1898                if !lock.external_files_dragged {
1899                    lock.synthetic_drag_counter += 1;
1900                    let executor = lock.executor.clone();
1901                    executor
1902                        .spawn(synthetic_drag(
1903                            weak_window_state,
1904                            lock.synthetic_drag_counter,
1905                            event.clone(),
1906                        ))
1907                        .detach();
1908                }
1909            }
1910
1911            PlatformInput::MouseUp(MouseUpEvent { .. }) => {
1912                lock.synthetic_drag_counter += 1;
1913            }
1914
1915            PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1916                modifiers,
1917                capslock,
1918            }) => {
1919                // Only raise modifiers changed event when they have actually changed
1920                if let Some(PlatformInput::ModifiersChanged(ModifiersChangedEvent {
1921                    modifiers: prev_modifiers,
1922                    capslock: prev_capslock,
1923                })) = &lock.previous_modifiers_changed_event
1924                    && prev_modifiers == modifiers
1925                    && prev_capslock == capslock
1926                {
1927                    return;
1928                }
1929
1930                lock.previous_modifiers_changed_event = Some(event.clone());
1931            }
1932
1933            _ => {}
1934        }
1935
1936        if let Some(mut callback) = lock.event_callback.take() {
1937            drop(lock);
1938            callback(event);
1939            window_state.lock().event_callback = Some(callback);
1940        }
1941    }
1942}
1943
1944extern "C" fn window_did_change_occlusion_state(this: &Object, _: Sel, _: id) {
1945    let window_state = unsafe { get_window_state(this) };
1946    let lock = &mut *window_state.lock();
1947    unsafe {
1948        if lock
1949            .native_window
1950            .occlusionState()
1951            .contains(NSWindowOcclusionState::NSWindowOcclusionStateVisible)
1952        {
1953            lock.move_traffic_light();
1954            lock.start_display_link();
1955        } else {
1956            lock.stop_display_link();
1957        }
1958    }
1959}
1960
1961extern "C" fn window_did_resize(this: &Object, _: Sel, _: id) {
1962    let window_state = unsafe { get_window_state(this) };
1963    window_state.as_ref().lock().move_traffic_light();
1964}
1965
1966extern "C" fn window_will_enter_fullscreen(this: &Object, _: Sel, _: id) {
1967    let window_state = unsafe { get_window_state(this) };
1968    let mut lock = window_state.as_ref().lock();
1969    lock.fullscreen_restore_bounds = lock.bounds();
1970
1971    let min_version = NSOperatingSystemVersion::new(15, 3, 0);
1972
1973    if is_macos_version_at_least(min_version) {
1974        unsafe {
1975            lock.native_window.setTitlebarAppearsTransparent_(NO);
1976        }
1977    }
1978}
1979
1980extern "C" fn window_will_exit_fullscreen(this: &Object, _: Sel, _: id) {
1981    let window_state = unsafe { get_window_state(this) };
1982    let mut lock = window_state.as_ref().lock();
1983
1984    let min_version = NSOperatingSystemVersion::new(15, 3, 0);
1985
1986    if is_macos_version_at_least(min_version) && lock.transparent_titlebar {
1987        unsafe {
1988            lock.native_window.setTitlebarAppearsTransparent_(YES);
1989        }
1990    }
1991}
1992
1993pub(crate) fn is_macos_version_at_least(version: NSOperatingSystemVersion) -> bool {
1994    unsafe { NSProcessInfo::processInfo(nil).isOperatingSystemAtLeastVersion(version) }
1995}
1996
1997extern "C" fn window_did_move(this: &Object, _: Sel, _: id) {
1998    let window_state = unsafe { get_window_state(this) };
1999    let mut lock = window_state.as_ref().lock();
2000    if let Some(mut callback) = lock.moved_callback.take() {
2001        drop(lock);
2002        callback();
2003        window_state.lock().moved_callback = Some(callback);
2004    }
2005}
2006
2007// Update the window scale factor and drawable size, and call the resize callback if any.
2008fn update_window_scale_factor(window_state: &Arc<Mutex<MacWindowState>>) {
2009    let mut lock = window_state.as_ref().lock();
2010    let scale_factor = lock.scale_factor();
2011    let size = lock.content_size();
2012    let drawable_size = size.to_device_pixels(scale_factor);
2013    unsafe {
2014        let _: () = msg_send![
2015            lock.renderer.layer(),
2016            setContentsScale: scale_factor as f64
2017        ];
2018    }
2019
2020    lock.renderer.update_drawable_size(drawable_size);
2021
2022    if let Some(mut callback) = lock.resize_callback.take() {
2023        let content_size = lock.content_size();
2024        let scale_factor = lock.scale_factor();
2025        drop(lock);
2026        callback(content_size, scale_factor);
2027        window_state.as_ref().lock().resize_callback = Some(callback);
2028    };
2029}
2030
2031extern "C" fn window_did_change_screen(this: &Object, _: Sel, _: id) {
2032    let window_state = unsafe { get_window_state(this) };
2033    let mut lock = window_state.as_ref().lock();
2034    lock.start_display_link();
2035    drop(lock);
2036    update_window_scale_factor(&window_state);
2037}
2038
2039extern "C" fn window_did_change_key_status(this: &Object, selector: Sel, _: id) {
2040    let window_state = unsafe { get_window_state(this) };
2041    let mut lock = window_state.lock();
2042    let is_active = unsafe { lock.native_window.isKeyWindow() == YES };
2043
2044    // When opening a pop-up while the application isn't active, Cocoa sends a spurious
2045    // `windowDidBecomeKey` message to the previous key window even though that window
2046    // isn't actually key. This causes a bug if the application is later activated while
2047    // the pop-up is still open, making it impossible to activate the previous key window
2048    // even if the pop-up gets closed. The only way to activate it again is to de-activate
2049    // the app and re-activate it, which is a pretty bad UX.
2050    // The following code detects the spurious event and invokes `resignKeyWindow`:
2051    // in theory, we're not supposed to invoke this method manually but it balances out
2052    // the spurious `becomeKeyWindow` event and helps us work around that bug.
2053    if selector == sel!(windowDidBecomeKey:) && !is_active {
2054        unsafe {
2055            let _: () = msg_send![lock.native_window, resignKeyWindow];
2056            return;
2057        }
2058    }
2059
2060    let executor = lock.executor.clone();
2061    drop(lock);
2062
2063    // When a window becomes active, trigger an immediate synchronous frame request to prevent
2064    // tab flicker when switching between windows in native tabs mode.
2065    //
2066    // This is only done on subsequent activations (not the first) to ensure the initial focus
2067    // path is properly established. Without this guard, the focus state would remain unset until
2068    // the first mouse click, causing keybindings to be non-functional.
2069    if selector == sel!(windowDidBecomeKey:) && is_active {
2070        let window_state = unsafe { get_window_state(this) };
2071        let mut lock = window_state.lock();
2072
2073        if lock.activated_least_once {
2074            if let Some(mut callback) = lock.request_frame_callback.take() {
2075                #[cfg(not(feature = "macos-blade"))]
2076                lock.renderer.set_presents_with_transaction(true);
2077                lock.stop_display_link();
2078                drop(lock);
2079                callback(Default::default());
2080
2081                let mut lock = window_state.lock();
2082                lock.request_frame_callback = Some(callback);
2083                #[cfg(not(feature = "macos-blade"))]
2084                lock.renderer.set_presents_with_transaction(false);
2085                lock.start_display_link();
2086            }
2087        } else {
2088            lock.activated_least_once = true;
2089        }
2090    }
2091
2092    executor
2093        .spawn(async move {
2094            let mut lock = window_state.as_ref().lock();
2095            if is_active {
2096                lock.move_traffic_light();
2097            }
2098
2099            if let Some(mut callback) = lock.activate_callback.take() {
2100                drop(lock);
2101                callback(is_active);
2102                window_state.lock().activate_callback = Some(callback);
2103            };
2104        })
2105        .detach();
2106}
2107
2108extern "C" fn window_should_close(this: &Object, _: Sel, _: id) -> BOOL {
2109    let window_state = unsafe { get_window_state(this) };
2110    let mut lock = window_state.as_ref().lock();
2111    if let Some(mut callback) = lock.should_close_callback.take() {
2112        drop(lock);
2113        let should_close = callback();
2114        window_state.lock().should_close_callback = Some(callback);
2115        should_close as BOOL
2116    } else {
2117        YES
2118    }
2119}
2120
2121extern "C" fn close_window(this: &Object, _: Sel) {
2122    unsafe {
2123        let close_callback = {
2124            let window_state = get_window_state(this);
2125            let mut lock = window_state.as_ref().lock();
2126            lock.close_callback.take()
2127        };
2128
2129        if let Some(callback) = close_callback {
2130            callback();
2131        }
2132
2133        let _: () = msg_send![super(this, class!(NSWindow)), close];
2134    }
2135}
2136
2137extern "C" fn make_backing_layer(this: &Object, _: Sel) -> id {
2138    let window_state = unsafe { get_window_state(this) };
2139    let window_state = window_state.as_ref().lock();
2140    window_state.renderer.layer_ptr() as id
2141}
2142
2143extern "C" fn view_did_change_backing_properties(this: &Object, _: Sel) {
2144    let window_state = unsafe { get_window_state(this) };
2145    update_window_scale_factor(&window_state);
2146}
2147
2148extern "C" fn set_frame_size(this: &Object, _: Sel, size: NSSize) {
2149    let window_state = unsafe { get_window_state(this) };
2150    let mut lock = window_state.as_ref().lock();
2151
2152    let new_size = Size::<Pixels>::from(size);
2153    let old_size = unsafe {
2154        let old_frame: NSRect = msg_send![this, frame];
2155        Size::<Pixels>::from(old_frame.size)
2156    };
2157
2158    if old_size == new_size {
2159        return;
2160    }
2161
2162    unsafe {
2163        let _: () = msg_send![super(this, class!(NSView)), setFrameSize: size];
2164    }
2165
2166    let scale_factor = lock.scale_factor();
2167    let drawable_size = new_size.to_device_pixels(scale_factor);
2168    lock.renderer.update_drawable_size(drawable_size);
2169
2170    if let Some(mut callback) = lock.resize_callback.take() {
2171        let content_size = lock.content_size();
2172        let scale_factor = lock.scale_factor();
2173        drop(lock);
2174        callback(content_size, scale_factor);
2175        window_state.lock().resize_callback = Some(callback);
2176    };
2177}
2178
2179extern "C" fn display_layer(this: &Object, _: Sel, _: id) {
2180    let window_state = unsafe { get_window_state(this) };
2181    let mut lock = window_state.lock();
2182    if let Some(mut callback) = lock.request_frame_callback.take() {
2183        #[cfg(not(feature = "macos-blade"))]
2184        lock.renderer.set_presents_with_transaction(true);
2185        lock.stop_display_link();
2186        drop(lock);
2187        callback(Default::default());
2188
2189        let mut lock = window_state.lock();
2190        lock.request_frame_callback = Some(callback);
2191        #[cfg(not(feature = "macos-blade"))]
2192        lock.renderer.set_presents_with_transaction(false);
2193        lock.start_display_link();
2194    }
2195}
2196
2197unsafe extern "C" fn step(view: *mut c_void) {
2198    let view = view as id;
2199    let window_state = unsafe { get_window_state(&*view) };
2200    let mut lock = window_state.lock();
2201
2202    if let Some(mut callback) = lock.request_frame_callback.take() {
2203        drop(lock);
2204        callback(Default::default());
2205        window_state.lock().request_frame_callback = Some(callback);
2206    }
2207}
2208
2209extern "C" fn valid_attributes_for_marked_text(_: &Object, _: Sel) -> id {
2210    unsafe { msg_send![class!(NSArray), array] }
2211}
2212
2213extern "C" fn has_marked_text(this: &Object, _: Sel) -> BOOL {
2214    let has_marked_text_result =
2215        with_input_handler(this, |input_handler| input_handler.marked_text_range()).flatten();
2216
2217    has_marked_text_result.is_some() as BOOL
2218}
2219
2220extern "C" fn marked_range(this: &Object, _: Sel) -> NSRange {
2221    let marked_range_result =
2222        with_input_handler(this, |input_handler| input_handler.marked_text_range()).flatten();
2223
2224    marked_range_result.map_or(NSRange::invalid(), |range| range.into())
2225}
2226
2227extern "C" fn selected_range(this: &Object, _: Sel) -> NSRange {
2228    let selected_range_result = with_input_handler(this, |input_handler| {
2229        input_handler.selected_text_range(false)
2230    })
2231    .flatten();
2232
2233    selected_range_result.map_or(NSRange::invalid(), |selection| selection.range.into())
2234}
2235
2236extern "C" fn first_rect_for_character_range(
2237    this: &Object,
2238    _: Sel,
2239    range: NSRange,
2240    _: id,
2241) -> NSRect {
2242    let frame = get_frame(this);
2243    with_input_handler(this, |input_handler| {
2244        input_handler.bounds_for_range(range.to_range()?)
2245    })
2246    .flatten()
2247    .map_or(
2248        NSRect::new(NSPoint::new(0., 0.), NSSize::new(0., 0.)),
2249        |bounds| {
2250            NSRect::new(
2251                NSPoint::new(
2252                    frame.origin.x + bounds.origin.x.0 as f64,
2253                    frame.origin.y + frame.size.height
2254                        - bounds.origin.y.0 as f64
2255                        - bounds.size.height.0 as f64,
2256                ),
2257                NSSize::new(bounds.size.width.0 as f64, bounds.size.height.0 as f64),
2258            )
2259        },
2260    )
2261}
2262
2263fn get_frame(this: &Object) -> NSRect {
2264    unsafe {
2265        let state = get_window_state(this);
2266        let lock = state.lock();
2267        let mut frame = NSWindow::frame(lock.native_window);
2268        let content_layout_rect: CGRect = msg_send![lock.native_window, contentLayoutRect];
2269        let style_mask: NSWindowStyleMask = msg_send![lock.native_window, styleMask];
2270        if !style_mask.contains(NSWindowStyleMask::NSFullSizeContentViewWindowMask) {
2271            frame.origin.y -= frame.size.height - content_layout_rect.size.height;
2272        }
2273        frame
2274    }
2275}
2276
2277extern "C" fn insert_text(this: &Object, _: Sel, text: id, replacement_range: NSRange) {
2278    unsafe {
2279        let is_attributed_string: BOOL =
2280            msg_send![text, isKindOfClass: [class!(NSAttributedString)]];
2281        let text: id = if is_attributed_string == YES {
2282            msg_send![text, string]
2283        } else {
2284            text
2285        };
2286
2287        let text = text.to_str();
2288        let replacement_range = replacement_range.to_range();
2289        with_input_handler(this, |input_handler| {
2290            input_handler.replace_text_in_range(replacement_range, text)
2291        });
2292    }
2293}
2294
2295extern "C" fn set_marked_text(
2296    this: &Object,
2297    _: Sel,
2298    text: id,
2299    selected_range: NSRange,
2300    replacement_range: NSRange,
2301) {
2302    unsafe {
2303        let is_attributed_string: BOOL =
2304            msg_send![text, isKindOfClass: [class!(NSAttributedString)]];
2305        let text: id = if is_attributed_string == YES {
2306            msg_send![text, string]
2307        } else {
2308            text
2309        };
2310        let selected_range = selected_range.to_range();
2311        let replacement_range = replacement_range.to_range();
2312        let text = text.to_str();
2313        with_input_handler(this, |input_handler| {
2314            input_handler.replace_and_mark_text_in_range(replacement_range, text, selected_range)
2315        });
2316    }
2317}
2318extern "C" fn unmark_text(this: &Object, _: Sel) {
2319    with_input_handler(this, |input_handler| input_handler.unmark_text());
2320}
2321
2322extern "C" fn attributed_substring_for_proposed_range(
2323    this: &Object,
2324    _: Sel,
2325    range: NSRange,
2326    actual_range: *mut c_void,
2327) -> id {
2328    with_input_handler(this, |input_handler| {
2329        let range = range.to_range()?;
2330        if range.is_empty() {
2331            return None;
2332        }
2333        let mut adjusted: Option<Range<usize>> = None;
2334
2335        let selected_text = input_handler.text_for_range(range.clone(), &mut adjusted)?;
2336        if let Some(adjusted) = adjusted
2337            && adjusted != range
2338        {
2339            unsafe { (actual_range as *mut NSRange).write(NSRange::from(adjusted)) };
2340        }
2341        unsafe {
2342            let string: id = msg_send![class!(NSAttributedString), alloc];
2343            let string: id = msg_send![string, initWithString: ns_string(&selected_text)];
2344            Some(string)
2345        }
2346    })
2347    .flatten()
2348    .unwrap_or(nil)
2349}
2350
2351// We ignore which selector it asks us to do because the user may have
2352// bound the shortcut to something else.
2353extern "C" fn do_command_by_selector(this: &Object, _: Sel, _: Sel) {
2354    let state = unsafe { get_window_state(this) };
2355    let mut lock = state.as_ref().lock();
2356    let keystroke = lock.keystroke_for_do_command.take();
2357    let mut event_callback = lock.event_callback.take();
2358    drop(lock);
2359
2360    if let Some((keystroke, mut callback)) = keystroke.zip(event_callback.as_mut()) {
2361        let handled = (callback)(PlatformInput::KeyDown(KeyDownEvent {
2362            keystroke,
2363            is_held: false,
2364            prefer_character_input: false,
2365        }));
2366        state.as_ref().lock().do_command_handled = Some(!handled.propagate);
2367    }
2368
2369    state.as_ref().lock().event_callback = event_callback;
2370}
2371
2372extern "C" fn view_did_change_effective_appearance(this: &Object, _: Sel) {
2373    unsafe {
2374        let state = get_window_state(this);
2375        let mut lock = state.as_ref().lock();
2376        if let Some(mut callback) = lock.appearance_changed_callback.take() {
2377            drop(lock);
2378            callback();
2379            state.lock().appearance_changed_callback = Some(callback);
2380        }
2381    }
2382}
2383
2384extern "C" fn accepts_first_mouse(this: &Object, _: Sel, _: id) -> BOOL {
2385    let window_state = unsafe { get_window_state(this) };
2386    let mut lock = window_state.as_ref().lock();
2387    lock.first_mouse = true;
2388    YES
2389}
2390
2391extern "C" fn character_index_for_point(this: &Object, _: Sel, position: NSPoint) -> u64 {
2392    let position = screen_point_to_gpui_point(this, position);
2393    with_input_handler(this, |input_handler| {
2394        input_handler.character_index_for_point(position)
2395    })
2396    .flatten()
2397    .map(|index| index as u64)
2398    .unwrap_or(NSNotFound as u64)
2399}
2400
2401fn screen_point_to_gpui_point(this: &Object, position: NSPoint) -> Point<Pixels> {
2402    let frame = get_frame(this);
2403    let window_x = position.x - frame.origin.x;
2404    let window_y = frame.size.height - (position.y - frame.origin.y);
2405
2406    point(px(window_x as f32), px(window_y as f32))
2407}
2408
2409extern "C" fn dragging_entered(this: &Object, _: Sel, dragging_info: id) -> NSDragOperation {
2410    let window_state = unsafe { get_window_state(this) };
2411    let position = drag_event_position(&window_state, dragging_info);
2412    let paths = external_paths_from_event(dragging_info);
2413    if let Some(event) =
2414        paths.map(|paths| PlatformInput::FileDrop(FileDropEvent::Entered { position, paths }))
2415        && send_new_event(&window_state, event)
2416    {
2417        window_state.lock().external_files_dragged = true;
2418        return NSDragOperationCopy;
2419    }
2420    NSDragOperationNone
2421}
2422
2423extern "C" fn dragging_updated(this: &Object, _: Sel, dragging_info: id) -> NSDragOperation {
2424    let window_state = unsafe { get_window_state(this) };
2425    let position = drag_event_position(&window_state, dragging_info);
2426    if send_new_event(
2427        &window_state,
2428        PlatformInput::FileDrop(FileDropEvent::Pending { position }),
2429    ) {
2430        NSDragOperationCopy
2431    } else {
2432        NSDragOperationNone
2433    }
2434}
2435
2436extern "C" fn dragging_exited(this: &Object, _: Sel, _: id) {
2437    let window_state = unsafe { get_window_state(this) };
2438    send_new_event(
2439        &window_state,
2440        PlatformInput::FileDrop(FileDropEvent::Exited),
2441    );
2442    window_state.lock().external_files_dragged = false;
2443}
2444
2445extern "C" fn perform_drag_operation(this: &Object, _: Sel, dragging_info: id) -> BOOL {
2446    let window_state = unsafe { get_window_state(this) };
2447    let position = drag_event_position(&window_state, dragging_info);
2448    send_new_event(
2449        &window_state,
2450        PlatformInput::FileDrop(FileDropEvent::Submit { position }),
2451    )
2452    .to_objc()
2453}
2454
2455fn external_paths_from_event(dragging_info: *mut Object) -> Option<ExternalPaths> {
2456    let mut paths = SmallVec::new();
2457    let pasteboard: id = unsafe { msg_send![dragging_info, draggingPasteboard] };
2458    let filenames = unsafe { NSPasteboard::propertyListForType(pasteboard, NSFilenamesPboardType) };
2459    if filenames == nil {
2460        return None;
2461    }
2462    for file in unsafe { filenames.iter() } {
2463        let path = unsafe {
2464            let f = NSString::UTF8String(file);
2465            CStr::from_ptr(f).to_string_lossy().into_owned()
2466        };
2467        paths.push(PathBuf::from(path))
2468    }
2469    Some(ExternalPaths(paths))
2470}
2471
2472extern "C" fn conclude_drag_operation(this: &Object, _: Sel, _: id) {
2473    let window_state = unsafe { get_window_state(this) };
2474    send_new_event(
2475        &window_state,
2476        PlatformInput::FileDrop(FileDropEvent::Exited),
2477    );
2478}
2479
2480async fn synthetic_drag(
2481    window_state: Weak<Mutex<MacWindowState>>,
2482    drag_id: usize,
2483    event: MouseMoveEvent,
2484) {
2485    loop {
2486        Timer::after(Duration::from_millis(16)).await;
2487        if let Some(window_state) = window_state.upgrade() {
2488            let mut lock = window_state.lock();
2489            if lock.synthetic_drag_counter == drag_id {
2490                if let Some(mut callback) = lock.event_callback.take() {
2491                    drop(lock);
2492                    callback(PlatformInput::MouseMove(event.clone()));
2493                    window_state.lock().event_callback = Some(callback);
2494                }
2495            } else {
2496                break;
2497            }
2498        }
2499    }
2500}
2501
2502fn send_new_event(window_state_lock: &Mutex<MacWindowState>, e: PlatformInput) -> bool {
2503    let window_state = window_state_lock.lock().event_callback.take();
2504    if let Some(mut callback) = window_state {
2505        callback(e);
2506        window_state_lock.lock().event_callback = Some(callback);
2507        true
2508    } else {
2509        false
2510    }
2511}
2512
2513fn drag_event_position(window_state: &Mutex<MacWindowState>, dragging_info: id) -> Point<Pixels> {
2514    let drag_location: NSPoint = unsafe { msg_send![dragging_info, draggingLocation] };
2515    convert_mouse_position(drag_location, window_state.lock().content_size().height)
2516}
2517
2518fn with_input_handler<F, R>(window: &Object, f: F) -> Option<R>
2519where
2520    F: FnOnce(&mut PlatformInputHandler) -> R,
2521{
2522    let window_state = unsafe { get_window_state(window) };
2523    let mut lock = window_state.as_ref().lock();
2524    if let Some(mut input_handler) = lock.input_handler.take() {
2525        drop(lock);
2526        let result = f(&mut input_handler);
2527        window_state.lock().input_handler = Some(input_handler);
2528        Some(result)
2529    } else {
2530        None
2531    }
2532}
2533
2534unsafe fn display_id_for_screen(screen: id) -> CGDirectDisplayID {
2535    unsafe {
2536        let device_description = NSScreen::deviceDescription(screen);
2537        let screen_number_key: id = ns_string("NSScreenNumber");
2538        let screen_number = device_description.objectForKey_(screen_number_key);
2539        let screen_number: NSUInteger = msg_send![screen_number, unsignedIntegerValue];
2540        screen_number as CGDirectDisplayID
2541    }
2542}
2543
2544extern "C" fn blurred_view_init_with_frame(this: &Object, _: Sel, frame: NSRect) -> id {
2545    unsafe {
2546        let view = msg_send![super(this, class!(NSVisualEffectView)), initWithFrame: frame];
2547        // Use a colorless semantic material. The default value `AppearanceBased`, though not
2548        // manually set, is deprecated.
2549        NSVisualEffectView::setMaterial_(view, NSVisualEffectMaterial::Selection);
2550        NSVisualEffectView::setState_(view, NSVisualEffectState::Active);
2551        view
2552    }
2553}
2554
2555extern "C" fn blurred_view_update_layer(this: &Object, _: Sel) {
2556    unsafe {
2557        let _: () = msg_send![super(this, class!(NSVisualEffectView)), updateLayer];
2558        let layer: id = msg_send![this, layer];
2559        if !layer.is_null() {
2560            remove_layer_background(layer);
2561        }
2562    }
2563}
2564
2565unsafe fn remove_layer_background(layer: id) {
2566    unsafe {
2567        let _: () = msg_send![layer, setBackgroundColor:nil];
2568
2569        let class_name: id = msg_send![layer, className];
2570        if class_name.isEqualToString("CAChameleonLayer") {
2571            // Remove the desktop tinting effect.
2572            let _: () = msg_send![layer, setHidden: YES];
2573            return;
2574        }
2575
2576        let filters: id = msg_send![layer, filters];
2577        if !filters.is_null() {
2578            // Remove the increased saturation.
2579            // The effect of a `CAFilter` or `CIFilter` is determined by its name, and the
2580            // `description` reflects its name and some parameters. Currently `NSVisualEffectView`
2581            // uses a `CAFilter` named "colorSaturate". If one day they switch to `CIFilter`, the
2582            // `description` will still contain "Saturat" ("... inputSaturation = ...").
2583            let test_string: id = ns_string("Saturat");
2584            let count = NSArray::count(filters);
2585            for i in 0..count {
2586                let description: id = msg_send![filters.objectAtIndex(i), description];
2587                let hit: BOOL = msg_send![description, containsString: test_string];
2588                if hit == NO {
2589                    continue;
2590                }
2591
2592                let all_indices = NSRange {
2593                    location: 0,
2594                    length: count,
2595                };
2596                let indices: id = msg_send![class!(NSMutableIndexSet), indexSet];
2597                let _: () = msg_send![indices, addIndexesInRange: all_indices];
2598                let _: () = msg_send![indices, removeIndex:i];
2599                let filtered: id = msg_send![filters, objectsAtIndexes: indices];
2600                let _: () = msg_send![layer, setFilters: filtered];
2601                break;
2602            }
2603        }
2604
2605        let sublayers: id = msg_send![layer, sublayers];
2606        if !sublayers.is_null() {
2607            let count = NSArray::count(sublayers);
2608            for i in 0..count {
2609                let sublayer = sublayers.objectAtIndex(i);
2610                remove_layer_background(sublayer);
2611            }
2612        }
2613    }
2614}
2615
2616extern "C" fn add_titlebar_accessory_view_controller(this: &Object, _: Sel, view_controller: id) {
2617    unsafe {
2618        let _: () = msg_send![super(this, class!(NSWindow)), addTitlebarAccessoryViewController: view_controller];
2619
2620        // Hide the native tab bar and set its height to 0, since we render our own.
2621        let accessory_view: id = msg_send![view_controller, view];
2622        let _: () = msg_send![accessory_view, setHidden: YES];
2623        let mut frame: NSRect = msg_send![accessory_view, frame];
2624        frame.size.height = 0.0;
2625        let _: () = msg_send![accessory_view, setFrame: frame];
2626    }
2627}
2628
2629extern "C" fn move_tab_to_new_window(this: &Object, _: Sel, _: id) {
2630    unsafe {
2631        let _: () = msg_send![super(this, class!(NSWindow)), moveTabToNewWindow:nil];
2632
2633        let window_state = get_window_state(this);
2634        let mut lock = window_state.as_ref().lock();
2635        if let Some(mut callback) = lock.move_tab_to_new_window_callback.take() {
2636            drop(lock);
2637            callback();
2638            window_state.lock().move_tab_to_new_window_callback = Some(callback);
2639        }
2640    }
2641}
2642
2643extern "C" fn merge_all_windows(this: &Object, _: Sel, _: id) {
2644    unsafe {
2645        let _: () = msg_send![super(this, class!(NSWindow)), mergeAllWindows:nil];
2646
2647        let window_state = get_window_state(this);
2648        let mut lock = window_state.as_ref().lock();
2649        if let Some(mut callback) = lock.merge_all_windows_callback.take() {
2650            drop(lock);
2651            callback();
2652            window_state.lock().merge_all_windows_callback = Some(callback);
2653        }
2654    }
2655}
2656
2657extern "C" fn select_next_tab(this: &Object, _sel: Sel, _id: id) {
2658    let window_state = unsafe { get_window_state(this) };
2659    let mut lock = window_state.as_ref().lock();
2660    if let Some(mut callback) = lock.select_next_tab_callback.take() {
2661        drop(lock);
2662        callback();
2663        window_state.lock().select_next_tab_callback = Some(callback);
2664    }
2665}
2666
2667extern "C" fn select_previous_tab(this: &Object, _sel: Sel, _id: id) {
2668    let window_state = unsafe { get_window_state(this) };
2669    let mut lock = window_state.as_ref().lock();
2670    if let Some(mut callback) = lock.select_previous_tab_callback.take() {
2671        drop(lock);
2672        callback();
2673        window_state.lock().select_previous_tab_callback = Some(callback);
2674    }
2675}
2676
2677extern "C" fn toggle_tab_bar(this: &Object, _sel: Sel, _id: id) {
2678    unsafe {
2679        let _: () = msg_send![super(this, class!(NSWindow)), toggleTabBar:nil];
2680
2681        let window_state = get_window_state(this);
2682        let mut lock = window_state.as_ref().lock();
2683        lock.move_traffic_light();
2684
2685        if let Some(mut callback) = lock.toggle_tab_bar_callback.take() {
2686            drop(lock);
2687            callback();
2688            window_state.lock().toggle_tab_bar_callback = Some(callback);
2689        }
2690    }
2691}