1use core::str;
   2use std::{
   3    cell::RefCell,
   4    collections::{BTreeMap, HashSet},
   5    ops::Deref,
   6    path::PathBuf,
   7    rc::{Rc, Weak},
   8    time::{Duration, Instant},
   9};
  10
  11use anyhow::{Context as _, anyhow};
  12use calloop::{
  13    EventLoop, LoopHandle, RegistrationToken,
  14    generic::{FdWrapper, Generic},
  15};
  16use collections::HashMap;
  17use futures::channel::oneshot;
  18use http_client::Url;
  19use smallvec::SmallVec;
  20use util::ResultExt;
  21
  22use x11rb::{
  23    connection::{Connection, RequestConnection},
  24    cursor,
  25    errors::ConnectionError,
  26    protocol::randr::ConnectionExt as _,
  27    protocol::xinput::ConnectionExt,
  28    protocol::xkb::ConnectionExt as _,
  29    protocol::xproto::{
  30        AtomEnum, ChangeWindowAttributesAux, ClientMessageData, ClientMessageEvent,
  31        ConnectionExt as _, EventMask, KeyPressEvent,
  32    },
  33    protocol::{Event, randr, render, xinput, xkb, xproto},
  34    resource_manager::Database,
  35    wrapper::ConnectionExt as _,
  36    xcb_ffi::XCBConnection,
  37};
  38use xim::{AttributeName, Client, InputStyle, x11rb::X11rbClient};
  39use xkbc::x11::ffi::{XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION};
  40use xkbcommon::xkb::{self as xkbc, LayoutIndex, ModMask, STATE_LAYOUT_EFFECTIVE};
  41
  42use super::{
  43    ButtonOrScroll, ScrollDirection, button_or_scroll_from_event_detail,
  44    clipboard::{self, Clipboard},
  45    get_valuator_axis_index, modifiers_from_state, pressed_button_from_mask,
  46};
  47use super::{X11Display, X11WindowStatePtr, XcbAtoms};
  48use super::{XimCallbackEvent, XimHandler};
  49
  50use crate::platform::{
  51    LinuxCommon, PlatformWindow,
  52    blade::BladeContext,
  53    linux::{
  54        DEFAULT_CURSOR_ICON_NAME, LinuxClient, get_xkb_compose_state, is_within_click_distance,
  55        log_cursor_icon_warning, open_uri_internal,
  56        platform::{DOUBLE_CLICK_INTERVAL, SCROLL_LINES},
  57        reveal_path_internal,
  58        xdg_desktop_portal::{Event as XDPEvent, XDPEventSource},
  59    },
  60    scap_screen_capture::scap_screen_sources,
  61};
  62use crate::{
  63    AnyWindowHandle, Bounds, ClipboardItem, CursorStyle, DisplayId, FileDropEvent, Keystroke,
  64    LinuxKeyboardLayout, Modifiers, ModifiersChangedEvent, MouseButton, Pixels, Platform,
  65    PlatformDisplay, PlatformInput, PlatformKeyboardLayout, Point, RequestFrameOptions,
  66    ScaledPixels, ScreenCaptureSource, ScrollDelta, Size, TouchPhase, WindowParams, X11Window,
  67    modifiers_from_xinput_info, point, px,
  68};
  69
  70/// Value for DeviceId parameters which selects all devices.
  71pub(crate) const XINPUT_ALL_DEVICES: xinput::DeviceId = 0;
  72
  73/// Value for DeviceId parameters which selects all device groups. Events that
  74/// occur within the group are emitted by the group itself.
  75///
  76/// In XInput 2's interface, these are referred to as "master devices", but that
  77/// terminology is both archaic and unclear.
  78pub(crate) const XINPUT_ALL_DEVICE_GROUPS: xinput::DeviceId = 1;
  79
  80pub(crate) struct WindowRef {
  81    window: X11WindowStatePtr,
  82    refresh_event_token: RegistrationToken,
  83}
  84
  85impl WindowRef {
  86    pub fn handle(&self) -> AnyWindowHandle {
  87        self.window.state.borrow().handle
  88    }
  89}
  90
  91impl Deref for WindowRef {
  92    type Target = X11WindowStatePtr;
  93
  94    fn deref(&self) -> &Self::Target {
  95        &self.window
  96    }
  97}
  98
  99#[derive(Debug)]
 100#[non_exhaustive]
 101pub enum EventHandlerError {
 102    XCBConnectionError(ConnectionError),
 103    XIMClientError(xim::ClientError),
 104}
 105
 106impl std::error::Error for EventHandlerError {}
 107
 108impl std::fmt::Display for EventHandlerError {
 109    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 110        match self {
 111            EventHandlerError::XCBConnectionError(err) => err.fmt(f),
 112            EventHandlerError::XIMClientError(err) => err.fmt(f),
 113        }
 114    }
 115}
 116
 117impl From<ConnectionError> for EventHandlerError {
 118    fn from(err: ConnectionError) -> Self {
 119        EventHandlerError::XCBConnectionError(err)
 120    }
 121}
 122
 123impl From<xim::ClientError> for EventHandlerError {
 124    fn from(err: xim::ClientError) -> Self {
 125        EventHandlerError::XIMClientError(err)
 126    }
 127}
 128
 129#[derive(Debug, Default, Clone)]
 130struct XKBStateNotiy {
 131    depressed_layout: LayoutIndex,
 132    latched_layout: LayoutIndex,
 133    locked_layout: LayoutIndex,
 134}
 135
 136#[derive(Debug, Default)]
 137pub struct Xdnd {
 138    other_window: xproto::Window,
 139    drag_type: u32,
 140    retrieved: bool,
 141    position: Point<Pixels>,
 142}
 143
 144#[derive(Debug)]
 145struct PointerDeviceState {
 146    horizontal: ScrollAxisState,
 147    vertical: ScrollAxisState,
 148}
 149
 150#[derive(Debug, Default)]
 151struct ScrollAxisState {
 152    /// Valuator number for looking up this axis's scroll value.
 153    valuator_number: Option<u16>,
 154    /// Conversion factor from scroll units to lines.
 155    multiplier: f32,
 156    /// Last scroll value for calculating scroll delta.
 157    ///
 158    /// This gets set to `None` whenever it might be invalid - when devices change or when window focus changes.
 159    /// The logic errs on the side of invalidating this, since the consequence is just skipping the delta of one scroll event.
 160    /// The consequence of not invalidating it can be large invalid deltas, which are much more user visible.
 161    scroll_value: Option<f32>,
 162}
 163
 164pub struct X11ClientState {
 165    pub(crate) loop_handle: LoopHandle<'static, X11Client>,
 166    pub(crate) event_loop: Option<calloop::EventLoop<'static, X11Client>>,
 167
 168    pub(crate) last_click: Instant,
 169    pub(crate) last_mouse_button: Option<MouseButton>,
 170    pub(crate) last_location: Point<Pixels>,
 171    pub(crate) current_count: usize,
 172
 173    gpu_context: BladeContext,
 174
 175    pub(crate) scale_factor: f32,
 176
 177    xkb_context: xkbc::Context,
 178    pub(crate) xcb_connection: Rc<XCBConnection>,
 179    xkb_device_id: i32,
 180    client_side_decorations_supported: bool,
 181    pub(crate) x_root_index: usize,
 182    pub(crate) _resource_database: Database,
 183    pub(crate) atoms: XcbAtoms,
 184    pub(crate) windows: HashMap<xproto::Window, WindowRef>,
 185    pub(crate) mouse_focused_window: Option<xproto::Window>,
 186    pub(crate) keyboard_focused_window: Option<xproto::Window>,
 187    pub(crate) xkb: xkbc::State,
 188    previous_xkb_state: XKBStateNotiy,
 189    pub(crate) ximc: Option<X11rbClient<Rc<XCBConnection>>>,
 190    pub(crate) xim_handler: Option<XimHandler>,
 191    pub modifiers: Modifiers,
 192    // TODO: Can the other updates to `modifiers` be removed so that this is unnecessary?
 193    pub last_modifiers_changed_event: Modifiers,
 194
 195    pub(crate) compose_state: Option<xkbc::compose::State>,
 196    pub(crate) pre_edit_text: Option<String>,
 197    pub(crate) composing: bool,
 198    pub(crate) pre_key_char_down: Option<Keystroke>,
 199    pub(crate) cursor_handle: cursor::Handle,
 200    pub(crate) cursor_styles: HashMap<xproto::Window, CursorStyle>,
 201    pub(crate) cursor_cache: HashMap<CursorStyle, Option<xproto::Cursor>>,
 202
 203    pointer_device_states: BTreeMap<xinput::DeviceId, PointerDeviceState>,
 204
 205    pub(crate) common: LinuxCommon,
 206    pub(crate) clipboard: Clipboard,
 207    pub(crate) clipboard_item: Option<ClipboardItem>,
 208    pub(crate) xdnd_state: Xdnd,
 209}
 210
 211#[derive(Clone)]
 212pub struct X11ClientStatePtr(pub Weak<RefCell<X11ClientState>>);
 213
 214impl X11ClientStatePtr {
 215    fn get_client(&self) -> X11Client {
 216        X11Client(self.0.upgrade().expect("client already dropped"))
 217    }
 218
 219    pub fn drop_window(&self, x_window: u32) {
 220        let client = self.get_client();
 221        let mut state = client.0.borrow_mut();
 222
 223        if let Some(window_ref) = state.windows.remove(&x_window) {
 224            state.loop_handle.remove(window_ref.refresh_event_token);
 225        }
 226        if state.mouse_focused_window == Some(x_window) {
 227            state.mouse_focused_window = None;
 228        }
 229        if state.keyboard_focused_window == Some(x_window) {
 230            state.keyboard_focused_window = None;
 231        }
 232        state.cursor_styles.remove(&x_window);
 233
 234        if state.windows.is_empty() {
 235            state.common.signal.stop();
 236        }
 237    }
 238
 239    pub fn update_ime_position(&self, bounds: Bounds<ScaledPixels>) {
 240        let client = self.get_client();
 241        let mut state = client.0.borrow_mut();
 242        if state.composing || state.ximc.is_none() {
 243            return;
 244        }
 245
 246        let mut ximc = state.ximc.take().unwrap();
 247        let xim_handler = state.xim_handler.take().unwrap();
 248        let ic_attributes = ximc
 249            .build_ic_attributes()
 250            .push(
 251                xim::AttributeName::InputStyle,
 252                xim::InputStyle::PREEDIT_CALLBACKS,
 253            )
 254            .push(xim::AttributeName::ClientWindow, xim_handler.window)
 255            .push(xim::AttributeName::FocusWindow, xim_handler.window)
 256            .nested_list(xim::AttributeName::PreeditAttributes, |b| {
 257                b.push(
 258                    xim::AttributeName::SpotLocation,
 259                    xim::Point {
 260                        x: u32::from(bounds.origin.x + bounds.size.width) as i16,
 261                        y: u32::from(bounds.origin.y + bounds.size.height) as i16,
 262                    },
 263                );
 264            })
 265            .build();
 266        let _ = ximc
 267            .set_ic_values(xim_handler.im_id, xim_handler.ic_id, ic_attributes)
 268            .log_err();
 269        state.ximc = Some(ximc);
 270        state.xim_handler = Some(xim_handler);
 271    }
 272}
 273
 274#[derive(Clone)]
 275pub(crate) struct X11Client(Rc<RefCell<X11ClientState>>);
 276
 277impl X11Client {
 278    pub(crate) fn new() -> Self {
 279        let event_loop = EventLoop::try_new().unwrap();
 280
 281        let (common, main_receiver) = LinuxCommon::new(event_loop.get_signal());
 282
 283        let handle = event_loop.handle();
 284
 285        handle
 286            .insert_source(main_receiver, {
 287                let handle = handle.clone();
 288                move |event, _, _: &mut X11Client| {
 289                    if let calloop::channel::Event::Msg(runnable) = event {
 290                        // Insert the runnables as idle callbacks, so we make sure that user-input and X11
 291                        // events have higher priority and runnables are only worked off after the event
 292                        // callbacks.
 293                        handle.insert_idle(|_| {
 294                            runnable.run();
 295                        });
 296                    }
 297                }
 298            })
 299            .unwrap();
 300
 301        let (xcb_connection, x_root_index) = XCBConnection::connect(None).unwrap();
 302        xcb_connection
 303            .prefetch_extension_information(xkb::X11_EXTENSION_NAME)
 304            .unwrap();
 305        xcb_connection
 306            .prefetch_extension_information(randr::X11_EXTENSION_NAME)
 307            .unwrap();
 308        xcb_connection
 309            .prefetch_extension_information(render::X11_EXTENSION_NAME)
 310            .unwrap();
 311        xcb_connection
 312            .prefetch_extension_information(xinput::X11_EXTENSION_NAME)
 313            .unwrap();
 314
 315        // Announce to X server that XInput up to 2.1 is supported. To increase this to 2.2 and
 316        // beyond, support for touch events would need to be added.
 317        let xinput_version = xcb_connection
 318            .xinput_xi_query_version(2, 1)
 319            .unwrap()
 320            .reply()
 321            .unwrap();
 322        // XInput 1.x is not supported.
 323        assert!(
 324            xinput_version.major_version >= 2,
 325            "XInput version >= 2 required."
 326        );
 327
 328        let pointer_device_states =
 329            get_new_pointer_device_states(&xcb_connection, &BTreeMap::new());
 330
 331        let atoms = XcbAtoms::new(&xcb_connection).unwrap().reply().unwrap();
 332
 333        let root = xcb_connection.setup().roots[0].root;
 334        let compositor_present = check_compositor_present(&xcb_connection, root);
 335        let gtk_frame_extents_supported =
 336            check_gtk_frame_extents_supported(&xcb_connection, &atoms, root);
 337        let client_side_decorations_supported = compositor_present && gtk_frame_extents_supported;
 338        log::info!(
 339            "x11: compositor present: {}, gtk_frame_extents_supported: {}",
 340            compositor_present,
 341            gtk_frame_extents_supported
 342        );
 343
 344        let xkb = xcb_connection
 345            .xkb_use_extension(XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION)
 346            .unwrap()
 347            .reply()
 348            .unwrap();
 349
 350        let events = xkb::EventType::STATE_NOTIFY
 351            | xkb::EventType::MAP_NOTIFY
 352            | xkb::EventType::NEW_KEYBOARD_NOTIFY;
 353        xcb_connection
 354            .xkb_select_events(
 355                xkb::ID::USE_CORE_KBD.into(),
 356                0u8.into(),
 357                events,
 358                0u8.into(),
 359                0u8.into(),
 360                &xkb::SelectEventsAux::new(),
 361            )
 362            .unwrap();
 363        assert!(xkb.supported);
 364
 365        let xkb_context = xkbc::Context::new(xkbc::CONTEXT_NO_FLAGS);
 366        let xkb_device_id = xkbc::x11::get_core_keyboard_device_id(&xcb_connection);
 367        let xkb_state = {
 368            let xkb_keymap = xkbc::x11::keymap_new_from_device(
 369                &xkb_context,
 370                &xcb_connection,
 371                xkb_device_id,
 372                xkbc::KEYMAP_COMPILE_NO_FLAGS,
 373            );
 374            xkbc::x11::state_new_from_device(&xkb_keymap, &xcb_connection, xkb_device_id)
 375        };
 376        let compose_state = get_xkb_compose_state(&xkb_context);
 377        let resource_database = x11rb::resource_manager::new_from_default(&xcb_connection).unwrap();
 378
 379        let gpu_context = BladeContext::new().expect("Unable to init GPU context");
 380
 381        let scale_factor = resource_database
 382            .get_value("Xft.dpi", "Xft.dpi")
 383            .ok()
 384            .flatten()
 385            .map(|dpi: f32| dpi / 96.0)
 386            .unwrap_or(1.0);
 387
 388        let cursor_handle = cursor::Handle::new(&xcb_connection, x_root_index, &resource_database)
 389            .unwrap()
 390            .reply()
 391            .unwrap();
 392
 393        let clipboard = Clipboard::new().unwrap();
 394
 395        let xcb_connection = Rc::new(xcb_connection);
 396
 397        let ximc = X11rbClient::init(Rc::clone(&xcb_connection), x_root_index, None).ok();
 398        let xim_handler = if ximc.is_some() {
 399            Some(XimHandler::new())
 400        } else {
 401            None
 402        };
 403
 404        // Safety: Safe if xcb::Connection always returns a valid fd
 405        let fd = unsafe { FdWrapper::new(Rc::clone(&xcb_connection)) };
 406
 407        handle
 408            .insert_source(
 409                Generic::new_with_error::<EventHandlerError>(
 410                    fd,
 411                    calloop::Interest::READ,
 412                    calloop::Mode::Level,
 413                ),
 414                {
 415                    let xcb_connection = xcb_connection.clone();
 416                    move |_readiness, _, client| {
 417                        client.process_x11_events(&xcb_connection)?;
 418                        Ok(calloop::PostAction::Continue)
 419                    }
 420                },
 421            )
 422            .expect("Failed to initialize x11 event source");
 423
 424        handle
 425            .insert_source(XDPEventSource::new(&common.background_executor), {
 426                move |event, _, client| match event {
 427                    XDPEvent::WindowAppearance(appearance) => {
 428                        client.with_common(|common| common.appearance = appearance);
 429                        for (_, window) in &mut client.0.borrow_mut().windows {
 430                            window.window.set_appearance(appearance);
 431                        }
 432                    }
 433                    XDPEvent::CursorTheme(_) | XDPEvent::CursorSize(_) => {
 434                        // noop, X11 manages this for us.
 435                    }
 436                }
 437            })
 438            .unwrap();
 439
 440        X11Client(Rc::new(RefCell::new(X11ClientState {
 441            modifiers: Modifiers::default(),
 442            last_modifiers_changed_event: Modifiers::default(),
 443            event_loop: Some(event_loop),
 444            loop_handle: handle,
 445            common,
 446            last_click: Instant::now(),
 447            last_mouse_button: None,
 448            last_location: Point::new(px(0.0), px(0.0)),
 449            current_count: 0,
 450            gpu_context,
 451            scale_factor,
 452
 453            xkb_context,
 454            xcb_connection,
 455            xkb_device_id,
 456            client_side_decorations_supported,
 457            x_root_index,
 458            _resource_database: resource_database,
 459            atoms,
 460            windows: HashMap::default(),
 461            mouse_focused_window: None,
 462            keyboard_focused_window: None,
 463            xkb: xkb_state,
 464            previous_xkb_state: XKBStateNotiy::default(),
 465            ximc,
 466            xim_handler,
 467
 468            compose_state,
 469            pre_edit_text: None,
 470            pre_key_char_down: None,
 471            composing: false,
 472
 473            cursor_handle,
 474            cursor_styles: HashMap::default(),
 475            cursor_cache: HashMap::default(),
 476
 477            pointer_device_states,
 478
 479            clipboard,
 480            clipboard_item: None,
 481            xdnd_state: Xdnd::default(),
 482        })))
 483    }
 484
 485    pub fn process_x11_events(
 486        &self,
 487        xcb_connection: &XCBConnection,
 488    ) -> Result<(), EventHandlerError> {
 489        loop {
 490            let mut events = Vec::new();
 491            let mut windows_to_refresh = HashSet::new();
 492
 493            let mut last_key_release = None;
 494            let mut last_key_press: Option<KeyPressEvent> = None;
 495
 496            loop {
 497                match xcb_connection.poll_for_event() {
 498                    Ok(Some(event)) => {
 499                        match event {
 500                            Event::Expose(expose_event) => {
 501                                windows_to_refresh.insert(expose_event.window);
 502                            }
 503                            Event::KeyRelease(_) => {
 504                                last_key_release = Some(event);
 505                            }
 506                            Event::KeyPress(key_press) => {
 507                                if let Some(last_press) = last_key_press.as_ref() {
 508                                    if last_press.detail == key_press.detail {
 509                                        continue;
 510                                    }
 511                                }
 512
 513                                if let Some(Event::KeyRelease(key_release)) =
 514                                    last_key_release.take()
 515                                {
 516                                    // We ignore that last KeyRelease if it's too close to this KeyPress,
 517                                    // suggesting that it's auto-generated by X11 as a key-repeat event.
 518                                    if key_release.detail != key_press.detail
 519                                        || key_press.time.saturating_sub(key_release.time) > 20
 520                                    {
 521                                        events.push(Event::KeyRelease(key_release));
 522                                    }
 523                                }
 524                                events.push(Event::KeyPress(key_press));
 525                                last_key_press = Some(key_press);
 526                            }
 527                            _ => {
 528                                if let Some(release_event) = last_key_release.take() {
 529                                    events.push(release_event);
 530                                }
 531                                events.push(event);
 532                            }
 533                        }
 534                    }
 535                    Ok(None) => {
 536                        // Add any remaining stored KeyRelease event
 537                        if let Some(release_event) = last_key_release.take() {
 538                            events.push(release_event);
 539                        }
 540                        break;
 541                    }
 542                    Err(e) => {
 543                        log::warn!("error polling for X11 events: {e:?}");
 544                        break;
 545                    }
 546                }
 547            }
 548
 549            if events.is_empty() && windows_to_refresh.is_empty() {
 550                break;
 551            }
 552
 553            for window in windows_to_refresh.into_iter() {
 554                if let Some(window) = self.get_window(window) {
 555                    window.refresh(RequestFrameOptions {
 556                        require_presentation: true,
 557                    });
 558                }
 559            }
 560
 561            for event in events.into_iter() {
 562                let mut state = self.0.borrow_mut();
 563                if state.ximc.is_none() || state.xim_handler.is_none() {
 564                    drop(state);
 565                    self.handle_event(event);
 566                    continue;
 567                }
 568
 569                let mut ximc = state.ximc.take().unwrap();
 570                let mut xim_handler = state.xim_handler.take().unwrap();
 571                let xim_connected = xim_handler.connected;
 572                drop(state);
 573
 574                let xim_filtered = match ximc.filter_event(&event, &mut xim_handler) {
 575                    Ok(handled) => handled,
 576                    Err(err) => {
 577                        log::error!("XIMClientError: {}", err);
 578                        false
 579                    }
 580                };
 581                let xim_callback_event = xim_handler.last_callback_event.take();
 582
 583                let mut state = self.0.borrow_mut();
 584                state.ximc = Some(ximc);
 585                state.xim_handler = Some(xim_handler);
 586                drop(state);
 587
 588                if let Some(event) = xim_callback_event {
 589                    self.handle_xim_callback_event(event);
 590                }
 591
 592                if xim_filtered {
 593                    continue;
 594                }
 595
 596                if xim_connected {
 597                    self.xim_handle_event(event);
 598                } else {
 599                    self.handle_event(event);
 600                }
 601            }
 602        }
 603        Ok(())
 604    }
 605
 606    pub fn enable_ime(&self) {
 607        let mut state = self.0.borrow_mut();
 608        if state.ximc.is_none() {
 609            return;
 610        }
 611
 612        let mut ximc = state.ximc.take().unwrap();
 613        let mut xim_handler = state.xim_handler.take().unwrap();
 614        let mut ic_attributes = ximc
 615            .build_ic_attributes()
 616            .push(AttributeName::InputStyle, InputStyle::PREEDIT_CALLBACKS)
 617            .push(AttributeName::ClientWindow, xim_handler.window)
 618            .push(AttributeName::FocusWindow, xim_handler.window);
 619
 620        let window_id = state.keyboard_focused_window;
 621        drop(state);
 622        if let Some(window_id) = window_id {
 623            let window = self.get_window(window_id).unwrap();
 624            if let Some(area) = window.get_ime_area() {
 625                ic_attributes =
 626                    ic_attributes.nested_list(xim::AttributeName::PreeditAttributes, |b| {
 627                        b.push(
 628                            xim::AttributeName::SpotLocation,
 629                            xim::Point {
 630                                x: u32::from(area.origin.x + area.size.width) as i16,
 631                                y: u32::from(area.origin.y + area.size.height) as i16,
 632                            },
 633                        );
 634                    });
 635            }
 636        }
 637        ximc.create_ic(xim_handler.im_id, ic_attributes.build())
 638            .ok();
 639        state = self.0.borrow_mut();
 640        state.xim_handler = Some(xim_handler);
 641        state.ximc = Some(ximc);
 642    }
 643
 644    pub fn reset_ime(&self) {
 645        let mut state = self.0.borrow_mut();
 646        state.composing = false;
 647        if let Some(mut ximc) = state.ximc.take() {
 648            let xim_handler = state.xim_handler.as_ref().unwrap();
 649            ximc.reset_ic(xim_handler.im_id, xim_handler.ic_id).ok();
 650            state.ximc = Some(ximc);
 651        }
 652    }
 653
 654    fn get_window(&self, win: xproto::Window) -> Option<X11WindowStatePtr> {
 655        let state = self.0.borrow();
 656        state
 657            .windows
 658            .get(&win)
 659            .filter(|window_reference| !window_reference.window.state.borrow().destroyed)
 660            .map(|window_reference| window_reference.window.clone())
 661    }
 662
 663    fn handle_event(&self, event: Event) -> Option<()> {
 664        match event {
 665            Event::ClientMessage(event) => {
 666                let window = self.get_window(event.window)?;
 667                let [atom, arg1, arg2, arg3, arg4] = event.data.as_data32();
 668                let mut state = self.0.borrow_mut();
 669
 670                if atom == state.atoms.WM_DELETE_WINDOW {
 671                    // window "x" button clicked by user
 672                    if window.should_close() {
 673                        // Rest of the close logic is handled in drop_window()
 674                        window.close();
 675                    }
 676                } else if atom == state.atoms._NET_WM_SYNC_REQUEST {
 677                    window.state.borrow_mut().last_sync_counter =
 678                        Some(x11rb::protocol::sync::Int64 {
 679                            lo: arg2,
 680                            hi: arg3 as i32,
 681                        })
 682                }
 683
 684                if event.type_ == state.atoms.XdndEnter {
 685                    state.xdnd_state.other_window = atom;
 686                    if (arg1 & 0x1) == 0x1 {
 687                        state.xdnd_state.drag_type = xdnd_get_supported_atom(
 688                            &state.xcb_connection,
 689                            &state.atoms,
 690                            state.xdnd_state.other_window,
 691                        );
 692                    } else {
 693                        if let Some(atom) = [arg2, arg3, arg4]
 694                            .into_iter()
 695                            .find(|atom| xdnd_is_atom_supported(*atom, &state.atoms))
 696                        {
 697                            state.xdnd_state.drag_type = atom;
 698                        }
 699                    }
 700                } else if event.type_ == state.atoms.XdndLeave {
 701                    let position = state.xdnd_state.position;
 702                    drop(state);
 703                    window
 704                        .handle_input(PlatformInput::FileDrop(FileDropEvent::Pending { position }));
 705                    window.handle_input(PlatformInput::FileDrop(FileDropEvent::Exited {}));
 706                    self.0.borrow_mut().xdnd_state = Xdnd::default();
 707                } else if event.type_ == state.atoms.XdndPosition {
 708                    if let Ok(pos) = state
 709                        .xcb_connection
 710                        .query_pointer(event.window)
 711                        .unwrap()
 712                        .reply()
 713                    {
 714                        state.xdnd_state.position =
 715                            Point::new(Pixels(pos.win_x as f32), Pixels(pos.win_y as f32));
 716                    }
 717                    if !state.xdnd_state.retrieved {
 718                        state
 719                            .xcb_connection
 720                            .convert_selection(
 721                                event.window,
 722                                state.atoms.XdndSelection,
 723                                state.xdnd_state.drag_type,
 724                                state.atoms.XDND_DATA,
 725                                arg3,
 726                            )
 727                            .unwrap();
 728                    }
 729                    xdnd_send_status(
 730                        &state.xcb_connection,
 731                        &state.atoms,
 732                        event.window,
 733                        state.xdnd_state.other_window,
 734                        arg4,
 735                    );
 736                    let position = state.xdnd_state.position;
 737                    drop(state);
 738                    window
 739                        .handle_input(PlatformInput::FileDrop(FileDropEvent::Pending { position }));
 740                } else if event.type_ == state.atoms.XdndDrop {
 741                    xdnd_send_finished(
 742                        &state.xcb_connection,
 743                        &state.atoms,
 744                        event.window,
 745                        state.xdnd_state.other_window,
 746                    );
 747                    let position = state.xdnd_state.position;
 748                    drop(state);
 749                    window
 750                        .handle_input(PlatformInput::FileDrop(FileDropEvent::Submit { position }));
 751                    self.0.borrow_mut().xdnd_state = Xdnd::default();
 752                }
 753            }
 754            Event::SelectionNotify(event) => {
 755                let window = self.get_window(event.requestor)?;
 756                let mut state = self.0.borrow_mut();
 757                let property = state.xcb_connection.get_property(
 758                    false,
 759                    event.requestor,
 760                    state.atoms.XDND_DATA,
 761                    AtomEnum::ANY,
 762                    0,
 763                    1024,
 764                );
 765                if property.as_ref().log_err().is_none() {
 766                    return Some(());
 767                }
 768                if let Ok(reply) = property.unwrap().reply() {
 769                    match str::from_utf8(&reply.value) {
 770                        Ok(file_list) => {
 771                            let paths: SmallVec<[_; 2]> = file_list
 772                                .lines()
 773                                .filter_map(|path| Url::parse(path).log_err())
 774                                .filter_map(|url| url.to_file_path().log_err())
 775                                .collect();
 776                            let input = PlatformInput::FileDrop(FileDropEvent::Entered {
 777                                position: state.xdnd_state.position,
 778                                paths: crate::ExternalPaths(paths),
 779                            });
 780                            drop(state);
 781                            window.handle_input(input);
 782                            self.0.borrow_mut().xdnd_state.retrieved = true;
 783                        }
 784                        Err(_) => {}
 785                    }
 786                }
 787            }
 788            Event::ConfigureNotify(event) => {
 789                let bounds = Bounds {
 790                    origin: Point {
 791                        x: event.x.into(),
 792                        y: event.y.into(),
 793                    },
 794                    size: Size {
 795                        width: event.width.into(),
 796                        height: event.height.into(),
 797                    },
 798                };
 799                let window = self.get_window(event.window)?;
 800                window.configure(bounds).unwrap();
 801            }
 802            Event::PropertyNotify(event) => {
 803                let window = self.get_window(event.window)?;
 804                window.property_notify(event).unwrap();
 805            }
 806            Event::FocusIn(event) => {
 807                let window = self.get_window(event.event)?;
 808                window.set_active(true);
 809                let mut state = self.0.borrow_mut();
 810                state.keyboard_focused_window = Some(event.event);
 811                if let Some(handler) = state.xim_handler.as_mut() {
 812                    handler.window = event.event;
 813                }
 814                drop(state);
 815                self.enable_ime();
 816            }
 817            Event::FocusOut(event) => {
 818                let window = self.get_window(event.event)?;
 819                window.set_active(false);
 820                let mut state = self.0.borrow_mut();
 821                state.keyboard_focused_window = None;
 822                if let Some(compose_state) = state.compose_state.as_mut() {
 823                    compose_state.reset();
 824                }
 825                state.pre_edit_text.take();
 826                drop(state);
 827                self.reset_ime();
 828                window.handle_ime_delete();
 829            }
 830            Event::XkbNewKeyboardNotify(_) | Event::MapNotify(_) => {
 831                let mut state = self.0.borrow_mut();
 832                let xkb_state = {
 833                    let xkb_keymap = xkbc::x11::keymap_new_from_device(
 834                        &state.xkb_context,
 835                        &state.xcb_connection,
 836                        state.xkb_device_id,
 837                        xkbc::KEYMAP_COMPILE_NO_FLAGS,
 838                    );
 839                    xkbc::x11::state_new_from_device(
 840                        &xkb_keymap,
 841                        &state.xcb_connection,
 842                        state.xkb_device_id,
 843                    )
 844                };
 845                let depressed_layout = xkb_state.serialize_layout(xkbc::STATE_LAYOUT_DEPRESSED);
 846                let latched_layout = xkb_state.serialize_layout(xkbc::STATE_LAYOUT_LATCHED);
 847                let locked_layout = xkb_state.serialize_layout(xkbc::ffi::XKB_STATE_LAYOUT_LOCKED);
 848                state.previous_xkb_state = XKBStateNotiy {
 849                    depressed_layout,
 850                    latched_layout,
 851                    locked_layout,
 852                };
 853                state.xkb = xkb_state;
 854            }
 855            Event::XkbStateNotify(event) => {
 856                let mut state = self.0.borrow_mut();
 857                let old_layout = state.xkb.serialize_layout(STATE_LAYOUT_EFFECTIVE);
 858                let new_layout = u32::from(event.group);
 859                state.xkb.update_mask(
 860                    event.base_mods.into(),
 861                    event.latched_mods.into(),
 862                    event.locked_mods.into(),
 863                    event.base_group as u32,
 864                    event.latched_group as u32,
 865                    event.locked_group.into(),
 866                );
 867                state.previous_xkb_state = XKBStateNotiy {
 868                    depressed_layout: event.base_group as u32,
 869                    latched_layout: event.latched_group as u32,
 870                    locked_layout: event.locked_group.into(),
 871                };
 872
 873                if new_layout != old_layout {
 874                    if let Some(mut callback) = state.common.callbacks.keyboard_layout_change.take()
 875                    {
 876                        drop(state);
 877                        callback();
 878                        state = self.0.borrow_mut();
 879                        state.common.callbacks.keyboard_layout_change = Some(callback);
 880                    }
 881                }
 882
 883                let modifiers = Modifiers::from_xkb(&state.xkb);
 884                if state.last_modifiers_changed_event == modifiers {
 885                    drop(state);
 886                } else {
 887                    let focused_window_id = state.keyboard_focused_window?;
 888                    state.modifiers = modifiers;
 889                    state.last_modifiers_changed_event = modifiers;
 890                    drop(state);
 891
 892                    let focused_window = self.get_window(focused_window_id)?;
 893                    focused_window.handle_input(PlatformInput::ModifiersChanged(
 894                        ModifiersChangedEvent { modifiers },
 895                    ));
 896                }
 897            }
 898            Event::KeyPress(event) => {
 899                let window = self.get_window(event.event)?;
 900                let mut state = self.0.borrow_mut();
 901
 902                let modifiers = modifiers_from_state(event.state);
 903                state.modifiers = modifiers;
 904                state.pre_key_char_down.take();
 905                let keystroke = {
 906                    let code = event.detail.into();
 907                    let xkb_state = state.previous_xkb_state.clone();
 908                    state.xkb.update_mask(
 909                        event.state.bits() as ModMask,
 910                        0,
 911                        0,
 912                        xkb_state.depressed_layout,
 913                        xkb_state.latched_layout,
 914                        xkb_state.locked_layout,
 915                    );
 916                    let mut keystroke = crate::Keystroke::from_xkb(&state.xkb, modifiers, code);
 917                    let keysym = state.xkb.key_get_one_sym(code);
 918                    if keysym.is_modifier_key() {
 919                        return Some(());
 920                    }
 921                    if let Some(mut compose_state) = state.compose_state.take() {
 922                        compose_state.feed(keysym);
 923                        match compose_state.status() {
 924                            xkbc::Status::Composed => {
 925                                state.pre_edit_text.take();
 926                                keystroke.key_char = compose_state.utf8();
 927                                if let Some(keysym) = compose_state.keysym() {
 928                                    keystroke.key = xkbc::keysym_get_name(keysym);
 929                                }
 930                            }
 931                            xkbc::Status::Composing => {
 932                                keystroke.key_char = None;
 933                                state.pre_edit_text = compose_state
 934                                    .utf8()
 935                                    .or(crate::Keystroke::underlying_dead_key(keysym));
 936                                let pre_edit =
 937                                    state.pre_edit_text.clone().unwrap_or(String::default());
 938                                drop(state);
 939                                window.handle_ime_preedit(pre_edit);
 940                                state = self.0.borrow_mut();
 941                            }
 942                            xkbc::Status::Cancelled => {
 943                                let pre_edit = state.pre_edit_text.take();
 944                                drop(state);
 945                                if let Some(pre_edit) = pre_edit {
 946                                    window.handle_ime_commit(pre_edit);
 947                                }
 948                                if let Some(current_key) = Keystroke::underlying_dead_key(keysym) {
 949                                    window.handle_ime_preedit(current_key);
 950                                }
 951                                state = self.0.borrow_mut();
 952                                compose_state.feed(keysym);
 953                            }
 954                            _ => {}
 955                        }
 956                        state.compose_state = Some(compose_state);
 957                    }
 958                    keystroke
 959                };
 960                drop(state);
 961                window.handle_input(PlatformInput::KeyDown(crate::KeyDownEvent {
 962                    keystroke,
 963                    is_held: false,
 964                }));
 965            }
 966            Event::KeyRelease(event) => {
 967                let window = self.get_window(event.event)?;
 968                let mut state = self.0.borrow_mut();
 969
 970                let modifiers = modifiers_from_state(event.state);
 971                state.modifiers = modifiers;
 972
 973                let keystroke = {
 974                    let code = event.detail.into();
 975                    let xkb_state = state.previous_xkb_state.clone();
 976                    state.xkb.update_mask(
 977                        event.state.bits() as ModMask,
 978                        0,
 979                        0,
 980                        xkb_state.depressed_layout,
 981                        xkb_state.latched_layout,
 982                        xkb_state.locked_layout,
 983                    );
 984                    let keystroke = crate::Keystroke::from_xkb(&state.xkb, modifiers, code);
 985                    let keysym = state.xkb.key_get_one_sym(code);
 986                    if keysym.is_modifier_key() {
 987                        return Some(());
 988                    }
 989                    keystroke
 990                };
 991                drop(state);
 992                window.handle_input(PlatformInput::KeyUp(crate::KeyUpEvent { keystroke }));
 993            }
 994            Event::XinputButtonPress(event) => {
 995                let window = self.get_window(event.event)?;
 996                let mut state = self.0.borrow_mut();
 997
 998                let modifiers = modifiers_from_xinput_info(event.mods);
 999                state.modifiers = modifiers;
1000
1001                let position = point(
1002                    px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor),
1003                    px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor),
1004                );
1005
1006                if state.composing && state.ximc.is_some() {
1007                    drop(state);
1008                    self.reset_ime();
1009                    window.handle_ime_unmark();
1010                    state = self.0.borrow_mut();
1011                } else if let Some(text) = state.pre_edit_text.take() {
1012                    if let Some(compose_state) = state.compose_state.as_mut() {
1013                        compose_state.reset();
1014                    }
1015                    drop(state);
1016                    window.handle_ime_commit(text);
1017                    state = self.0.borrow_mut();
1018                }
1019                match button_or_scroll_from_event_detail(event.detail) {
1020                    Some(ButtonOrScroll::Button(button)) => {
1021                        let click_elapsed = state.last_click.elapsed();
1022                        if click_elapsed < DOUBLE_CLICK_INTERVAL
1023                            && state
1024                                .last_mouse_button
1025                                .is_some_and(|prev_button| prev_button == button)
1026                            && is_within_click_distance(state.last_location, position)
1027                        {
1028                            state.current_count += 1;
1029                        } else {
1030                            state.current_count = 1;
1031                        }
1032
1033                        state.last_click = Instant::now();
1034                        state.last_mouse_button = Some(button);
1035                        state.last_location = position;
1036                        let current_count = state.current_count;
1037
1038                        drop(state);
1039                        window.handle_input(PlatformInput::MouseDown(crate::MouseDownEvent {
1040                            button,
1041                            position,
1042                            modifiers,
1043                            click_count: current_count,
1044                            first_mouse: false,
1045                        }));
1046                    }
1047                    Some(ButtonOrScroll::Scroll(direction)) => {
1048                        drop(state);
1049                        // Emulated scroll button presses are sent simultaneously with smooth scrolling XinputMotion events.
1050                        // Since handling those events does the scrolling, they are skipped here.
1051                        if !event
1052                            .flags
1053                            .contains(xinput::PointerEventFlags::POINTER_EMULATED)
1054                        {
1055                            let scroll_delta = match direction {
1056                                ScrollDirection::Up => Point::new(0.0, SCROLL_LINES),
1057                                ScrollDirection::Down => Point::new(0.0, -SCROLL_LINES),
1058                                ScrollDirection::Left => Point::new(SCROLL_LINES, 0.0),
1059                                ScrollDirection::Right => Point::new(-SCROLL_LINES, 0.0),
1060                            };
1061                            window.handle_input(PlatformInput::ScrollWheel(
1062                                make_scroll_wheel_event(position, scroll_delta, modifiers),
1063                            ));
1064                        }
1065                    }
1066                    None => {
1067                        log::error!("Unknown x11 button: {}", event.detail);
1068                    }
1069                }
1070            }
1071            Event::XinputButtonRelease(event) => {
1072                let window = self.get_window(event.event)?;
1073                let mut state = self.0.borrow_mut();
1074                let modifiers = modifiers_from_xinput_info(event.mods);
1075                state.modifiers = modifiers;
1076
1077                let position = point(
1078                    px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor),
1079                    px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor),
1080                );
1081                match button_or_scroll_from_event_detail(event.detail) {
1082                    Some(ButtonOrScroll::Button(button)) => {
1083                        let click_count = state.current_count;
1084                        drop(state);
1085                        window.handle_input(PlatformInput::MouseUp(crate::MouseUpEvent {
1086                            button,
1087                            position,
1088                            modifiers,
1089                            click_count,
1090                        }));
1091                    }
1092                    Some(ButtonOrScroll::Scroll(_)) => {}
1093                    None => {}
1094                }
1095            }
1096            Event::XinputMotion(event) => {
1097                let window = self.get_window(event.event)?;
1098                let mut state = self.0.borrow_mut();
1099                let pressed_button = pressed_button_from_mask(event.button_mask[0]);
1100                let position = point(
1101                    px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor),
1102                    px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor),
1103                );
1104                let modifiers = modifiers_from_xinput_info(event.mods);
1105                state.modifiers = modifiers;
1106                drop(state);
1107
1108                if event.valuator_mask[0] & 3 != 0 {
1109                    window.handle_input(PlatformInput::MouseMove(crate::MouseMoveEvent {
1110                        position,
1111                        pressed_button,
1112                        modifiers,
1113                    }));
1114                }
1115
1116                state = self.0.borrow_mut();
1117                if let Some(mut pointer) = state.pointer_device_states.get_mut(&event.sourceid) {
1118                    let scroll_delta = get_scroll_delta_and_update_state(&mut pointer, &event);
1119                    drop(state);
1120                    if let Some(scroll_delta) = scroll_delta {
1121                        window.handle_input(PlatformInput::ScrollWheel(make_scroll_wheel_event(
1122                            position,
1123                            scroll_delta,
1124                            modifiers,
1125                        )));
1126                    }
1127                }
1128            }
1129            Event::XinputEnter(event) if event.mode == xinput::NotifyMode::NORMAL => {
1130                let window = self.get_window(event.event)?;
1131                window.set_hovered(true);
1132                let mut state = self.0.borrow_mut();
1133                state.mouse_focused_window = Some(event.event);
1134            }
1135            Event::XinputLeave(event) if event.mode == xinput::NotifyMode::NORMAL => {
1136                let mut state = self.0.borrow_mut();
1137
1138                // Set last scroll values to `None` so that a large delta isn't created if scrolling is done outside the window (the valuator is global)
1139                reset_all_pointer_device_scroll_positions(&mut state.pointer_device_states);
1140                state.mouse_focused_window = None;
1141                let pressed_button = pressed_button_from_mask(event.buttons[0]);
1142                let position = point(
1143                    px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor),
1144                    px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor),
1145                );
1146                let modifiers = modifiers_from_xinput_info(event.mods);
1147                state.modifiers = modifiers;
1148                drop(state);
1149
1150                let window = self.get_window(event.event)?;
1151                window.handle_input(PlatformInput::MouseExited(crate::MouseExitEvent {
1152                    pressed_button,
1153                    position,
1154                    modifiers,
1155                }));
1156                window.set_hovered(false);
1157            }
1158            Event::XinputHierarchy(event) => {
1159                let mut state = self.0.borrow_mut();
1160                // Temporarily use `state.pointer_device_states` to only store pointers that still have valid scroll values.
1161                // Any change to a device invalidates its scroll values.
1162                for info in event.infos {
1163                    if is_pointer_device(info.type_) {
1164                        state.pointer_device_states.remove(&info.deviceid);
1165                    }
1166                }
1167                state.pointer_device_states = get_new_pointer_device_states(
1168                    &state.xcb_connection,
1169                    &state.pointer_device_states,
1170                );
1171            }
1172            Event::XinputDeviceChanged(event) => {
1173                let mut state = self.0.borrow_mut();
1174                if let Some(mut pointer) = state.pointer_device_states.get_mut(&event.sourceid) {
1175                    reset_pointer_device_scroll_positions(&mut pointer);
1176                }
1177            }
1178            _ => {}
1179        };
1180
1181        Some(())
1182    }
1183
1184    fn handle_xim_callback_event(&self, event: XimCallbackEvent) {
1185        match event {
1186            XimCallbackEvent::XimXEvent(event) => {
1187                self.handle_event(event);
1188            }
1189            XimCallbackEvent::XimCommitEvent(window, text) => {
1190                self.xim_handle_commit(window, text);
1191            }
1192            XimCallbackEvent::XimPreeditEvent(window, text) => {
1193                self.xim_handle_preedit(window, text);
1194            }
1195        };
1196    }
1197
1198    fn xim_handle_event(&self, event: Event) -> Option<()> {
1199        match event {
1200            Event::KeyPress(event) | Event::KeyRelease(event) => {
1201                let mut state = self.0.borrow_mut();
1202                state.pre_key_char_down = Some(Keystroke::from_xkb(
1203                    &state.xkb,
1204                    state.modifiers,
1205                    event.detail.into(),
1206                ));
1207                let mut ximc = state.ximc.take().unwrap();
1208                let mut xim_handler = state.xim_handler.take().unwrap();
1209                drop(state);
1210                xim_handler.window = event.event;
1211                ximc.forward_event(
1212                    xim_handler.im_id,
1213                    xim_handler.ic_id,
1214                    xim::ForwardEventFlag::empty(),
1215                    &event,
1216                )
1217                .unwrap();
1218                let mut state = self.0.borrow_mut();
1219                state.ximc = Some(ximc);
1220                state.xim_handler = Some(xim_handler);
1221                drop(state);
1222            }
1223            event => {
1224                self.handle_event(event);
1225            }
1226        }
1227        Some(())
1228    }
1229
1230    fn xim_handle_commit(&self, window: xproto::Window, text: String) -> Option<()> {
1231        let window = self.get_window(window).unwrap();
1232        let mut state = self.0.borrow_mut();
1233        let keystroke = state.pre_key_char_down.take();
1234        state.composing = false;
1235        drop(state);
1236        if let Some(mut keystroke) = keystroke {
1237            keystroke.key_char = Some(text.clone());
1238            window.handle_input(PlatformInput::KeyDown(crate::KeyDownEvent {
1239                keystroke,
1240                is_held: false,
1241            }));
1242        }
1243
1244        Some(())
1245    }
1246
1247    fn xim_handle_preedit(&self, window: xproto::Window, text: String) -> Option<()> {
1248        let window = self.get_window(window).unwrap();
1249
1250        let mut state = self.0.borrow_mut();
1251        let mut ximc = state.ximc.take().unwrap();
1252        let mut xim_handler = state.xim_handler.take().unwrap();
1253        state.composing = !text.is_empty();
1254        drop(state);
1255        window.handle_ime_preedit(text);
1256
1257        if let Some(area) = window.get_ime_area() {
1258            let ic_attributes = ximc
1259                .build_ic_attributes()
1260                .push(
1261                    xim::AttributeName::InputStyle,
1262                    xim::InputStyle::PREEDIT_CALLBACKS,
1263                )
1264                .push(xim::AttributeName::ClientWindow, xim_handler.window)
1265                .push(xim::AttributeName::FocusWindow, xim_handler.window)
1266                .nested_list(xim::AttributeName::PreeditAttributes, |b| {
1267                    b.push(
1268                        xim::AttributeName::SpotLocation,
1269                        xim::Point {
1270                            x: u32::from(area.origin.x + area.size.width) as i16,
1271                            y: u32::from(area.origin.y + area.size.height) as i16,
1272                        },
1273                    );
1274                })
1275                .build();
1276            ximc.set_ic_values(xim_handler.im_id, xim_handler.ic_id, ic_attributes)
1277                .ok();
1278        }
1279        let mut state = self.0.borrow_mut();
1280        state.ximc = Some(ximc);
1281        state.xim_handler = Some(xim_handler);
1282        drop(state);
1283        Some(())
1284    }
1285}
1286
1287impl LinuxClient for X11Client {
1288    fn compositor_name(&self) -> &'static str {
1289        "X11"
1290    }
1291
1292    fn with_common<R>(&self, f: impl FnOnce(&mut LinuxCommon) -> R) -> R {
1293        f(&mut self.0.borrow_mut().common)
1294    }
1295
1296    fn keyboard_layout(&self) -> Box<dyn PlatformKeyboardLayout> {
1297        let state = self.0.borrow();
1298        let layout_idx = state.xkb.serialize_layout(STATE_LAYOUT_EFFECTIVE);
1299        Box::new(LinuxKeyboardLayout::new(
1300            state
1301                .xkb
1302                .get_keymap()
1303                .layout_get_name(layout_idx)
1304                .to_string(),
1305        ))
1306    }
1307
1308    fn displays(&self) -> Vec<Rc<dyn PlatformDisplay>> {
1309        let state = self.0.borrow();
1310        let setup = state.xcb_connection.setup();
1311        setup
1312            .roots
1313            .iter()
1314            .enumerate()
1315            .filter_map(|(root_id, _)| {
1316                Some(Rc::new(
1317                    X11Display::new(&state.xcb_connection, state.scale_factor, root_id).ok()?,
1318                ) as Rc<dyn PlatformDisplay>)
1319            })
1320            .collect()
1321    }
1322
1323    fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>> {
1324        let state = self.0.borrow();
1325
1326        Some(Rc::new(
1327            X11Display::new(
1328                &state.xcb_connection,
1329                state.scale_factor,
1330                state.x_root_index,
1331            )
1332            .expect("There should always be a root index"),
1333        ))
1334    }
1335
1336    fn display(&self, id: DisplayId) -> Option<Rc<dyn PlatformDisplay>> {
1337        let state = self.0.borrow();
1338
1339        Some(Rc::new(
1340            X11Display::new(&state.xcb_connection, state.scale_factor, id.0 as usize).ok()?,
1341        ))
1342    }
1343
1344    fn is_screen_capture_supported(&self) -> bool {
1345        true
1346    }
1347
1348    fn screen_capture_sources(
1349        &self,
1350    ) -> oneshot::Receiver<anyhow::Result<Vec<Box<dyn ScreenCaptureSource>>>> {
1351        scap_screen_sources(&self.0.borrow().common.foreground_executor)
1352    }
1353
1354    fn open_window(
1355        &self,
1356        handle: AnyWindowHandle,
1357        params: WindowParams,
1358    ) -> anyhow::Result<Box<dyn PlatformWindow>> {
1359        let mut state = self.0.borrow_mut();
1360        let x_window = state.xcb_connection.generate_id().unwrap();
1361
1362        let window = X11Window::new(
1363            handle,
1364            X11ClientStatePtr(Rc::downgrade(&self.0)),
1365            state.common.foreground_executor.clone(),
1366            &state.gpu_context,
1367            params,
1368            &state.xcb_connection,
1369            state.client_side_decorations_supported,
1370            state.x_root_index,
1371            x_window,
1372            &state.atoms,
1373            state.scale_factor,
1374            state.common.appearance,
1375        )?;
1376        state
1377            .xcb_connection
1378            .change_property32(
1379                xproto::PropMode::REPLACE,
1380                x_window,
1381                state.atoms.XdndAware,
1382                state.atoms.XA_ATOM,
1383                &[5],
1384            )
1385            .unwrap();
1386
1387        let screen_resources = state
1388            .xcb_connection
1389            .randr_get_screen_resources(x_window)
1390            .unwrap()
1391            .reply()
1392            .expect("Could not find available screens");
1393
1394        let mode = screen_resources
1395            .crtcs
1396            .iter()
1397            .find_map(|crtc| {
1398                let crtc_info = state
1399                    .xcb_connection
1400                    .randr_get_crtc_info(*crtc, x11rb::CURRENT_TIME)
1401                    .ok()?
1402                    .reply()
1403                    .ok()?;
1404
1405                screen_resources
1406                    .modes
1407                    .iter()
1408                    .find(|m| m.id == crtc_info.mode)
1409            })
1410            .expect("Unable to find screen refresh rate");
1411
1412        let refresh_event_token = state
1413            .loop_handle
1414            .insert_source(calloop::timer::Timer::immediate(), {
1415                let refresh_duration = mode_refresh_rate(mode);
1416                move |mut instant, (), client| {
1417                    let xcb_connection = {
1418                        let state = client.0.borrow_mut();
1419                        let xcb_connection = state.xcb_connection.clone();
1420                        if let Some(window) = state.windows.get(&x_window) {
1421                            let window = window.window.clone();
1422                            drop(state);
1423                            window.refresh(Default::default());
1424                        }
1425                        xcb_connection
1426                    };
1427                    client.process_x11_events(&xcb_connection).log_err();
1428
1429                    // Take into account that some frames have been skipped
1430                    let now = Instant::now();
1431                    while instant < now {
1432                        instant += refresh_duration;
1433                    }
1434                    calloop::timer::TimeoutAction::ToInstant(instant)
1435                }
1436            })
1437            .expect("Failed to initialize refresh timer");
1438
1439        let window_ref = WindowRef {
1440            window: window.0.clone(),
1441            refresh_event_token,
1442        };
1443
1444        state.windows.insert(x_window, window_ref);
1445        Ok(Box::new(window))
1446    }
1447
1448    fn set_cursor_style(&self, style: CursorStyle) {
1449        let mut state = self.0.borrow_mut();
1450        let Some(focused_window) = state.mouse_focused_window else {
1451            return;
1452        };
1453        let current_style = state
1454            .cursor_styles
1455            .get(&focused_window)
1456            .unwrap_or(&CursorStyle::Arrow);
1457        if *current_style == style {
1458            return;
1459        }
1460
1461        let Some(cursor) = state.get_cursor_icon(style) else {
1462            return;
1463        };
1464
1465        state.cursor_styles.insert(focused_window, style);
1466        state
1467            .xcb_connection
1468            .change_window_attributes(
1469                focused_window,
1470                &ChangeWindowAttributesAux {
1471                    cursor: Some(cursor),
1472                    ..Default::default()
1473                },
1474            )
1475            .anyhow()
1476            .and_then(|cookie| cookie.check().anyhow())
1477            .context("setting cursor style")
1478            .log_err();
1479    }
1480
1481    fn open_uri(&self, uri: &str) {
1482        #[cfg(any(feature = "wayland", feature = "x11"))]
1483        open_uri_internal(self.background_executor(), uri, None);
1484    }
1485
1486    fn reveal_path(&self, path: PathBuf) {
1487        #[cfg(any(feature = "x11", feature = "wayland"))]
1488        reveal_path_internal(self.background_executor(), path, None);
1489    }
1490
1491    fn write_to_primary(&self, item: crate::ClipboardItem) {
1492        let state = self.0.borrow_mut();
1493        state
1494            .clipboard
1495            .set_text(
1496                std::borrow::Cow::Owned(item.text().unwrap_or_default()),
1497                clipboard::ClipboardKind::Primary,
1498                clipboard::WaitConfig::None,
1499            )
1500            .context("Failed to write to clipboard (primary)")
1501            .log_with_level(log::Level::Debug);
1502    }
1503
1504    fn write_to_clipboard(&self, item: crate::ClipboardItem) {
1505        let mut state = self.0.borrow_mut();
1506        state
1507            .clipboard
1508            .set_text(
1509                std::borrow::Cow::Owned(item.text().unwrap_or_default()),
1510                clipboard::ClipboardKind::Clipboard,
1511                clipboard::WaitConfig::None,
1512            )
1513            .context("Failed to write to clipboard (clipboard)")
1514            .log_with_level(log::Level::Debug);
1515        state.clipboard_item.replace(item);
1516    }
1517
1518    fn read_from_primary(&self) -> Option<crate::ClipboardItem> {
1519        let state = self.0.borrow_mut();
1520        return state
1521            .clipboard
1522            .get_any(clipboard::ClipboardKind::Primary)
1523            .context("Failed to read from clipboard (primary)")
1524            .log_with_level(log::Level::Debug);
1525    }
1526
1527    fn read_from_clipboard(&self) -> Option<crate::ClipboardItem> {
1528        let state = self.0.borrow_mut();
1529        // if the last copy was from this app, return our cached item
1530        // which has metadata attached.
1531        if state
1532            .clipboard
1533            .is_owner(clipboard::ClipboardKind::Clipboard)
1534        {
1535            return state.clipboard_item.clone();
1536        }
1537        return state
1538            .clipboard
1539            .get_any(clipboard::ClipboardKind::Clipboard)
1540            .context("Failed to read from clipboard (clipboard)")
1541            .log_with_level(log::Level::Debug);
1542    }
1543
1544    fn run(&self) {
1545        let mut event_loop = self
1546            .0
1547            .borrow_mut()
1548            .event_loop
1549            .take()
1550            .expect("App is already running");
1551
1552        event_loop.run(None, &mut self.clone(), |_| {}).log_err();
1553    }
1554
1555    fn active_window(&self) -> Option<AnyWindowHandle> {
1556        let state = self.0.borrow();
1557        state.keyboard_focused_window.and_then(|focused_window| {
1558            state
1559                .windows
1560                .get(&focused_window)
1561                .map(|window| window.handle())
1562        })
1563    }
1564
1565    fn window_stack(&self) -> Option<Vec<AnyWindowHandle>> {
1566        let state = self.0.borrow();
1567        let root = state.xcb_connection.setup().roots[state.x_root_index].root;
1568
1569        let reply = state
1570            .xcb_connection
1571            .get_property(
1572                false,
1573                root,
1574                state.atoms._NET_CLIENT_LIST_STACKING,
1575                xproto::AtomEnum::WINDOW,
1576                0,
1577                u32::MAX,
1578            )
1579            .ok()?
1580            .reply()
1581            .ok()?;
1582
1583        let window_ids = reply
1584            .value
1585            .chunks_exact(4)
1586            .map(|chunk| u32::from_ne_bytes(chunk.try_into().unwrap()))
1587            .collect::<Vec<xproto::Window>>();
1588
1589        let mut handles = Vec::new();
1590
1591        // We need to reverse, since _NET_CLIENT_LIST_STACKING has
1592        // a back-to-front order.
1593        // See: https://specifications.freedesktop.org/wm-spec/1.3/ar01s03.html
1594        for window_ref in window_ids
1595            .iter()
1596            .rev()
1597            .filter_map(|&win| state.windows.get(&win))
1598        {
1599            if !window_ref.window.state.borrow().destroyed {
1600                handles.push(window_ref.handle());
1601            }
1602        }
1603
1604        Some(handles)
1605    }
1606}
1607
1608impl X11ClientState {
1609    fn get_cursor_icon(&mut self, style: CursorStyle) -> Option<xproto::Cursor> {
1610        if let Some(cursor) = self.cursor_cache.get(&style) {
1611            return *cursor;
1612        }
1613
1614        let mut result;
1615        match style {
1616            CursorStyle::None => match create_invisible_cursor(&self.xcb_connection) {
1617                Ok(loaded_cursor) => result = Ok(loaded_cursor),
1618                Err(err) => result = Err(err.context("error while creating invisible cursor")),
1619            },
1620            _ => 'outer: {
1621                let mut errors = String::new();
1622                let cursor_icon_names = style.to_icon_names();
1623                for cursor_icon_name in cursor_icon_names {
1624                    match self
1625                        .cursor_handle
1626                        .load_cursor(&self.xcb_connection, cursor_icon_name)
1627                    {
1628                        Ok(loaded_cursor) => {
1629                            if loaded_cursor != x11rb::NONE {
1630                                result = Ok(loaded_cursor);
1631                                break 'outer;
1632                            }
1633                        }
1634                        Err(err) => {
1635                            errors.push_str(&err.to_string());
1636                            errors.push('\n');
1637                        }
1638                    }
1639                }
1640                if errors.is_empty() {
1641                    result = Err(anyhow!(
1642                        "errors while loading cursor icons {:?}:\n{}",
1643                        cursor_icon_names,
1644                        errors
1645                    ));
1646                } else {
1647                    result = Err(anyhow!("did not find cursor icons {:?}", cursor_icon_names));
1648                }
1649            }
1650        };
1651
1652        let cursor = match result {
1653            Ok(cursor) => Some(cursor),
1654            Err(err) => {
1655                match self
1656                    .cursor_handle
1657                    .load_cursor(&self.xcb_connection, DEFAULT_CURSOR_ICON_NAME)
1658                {
1659                    Ok(default) => {
1660                        log_cursor_icon_warning(err.context(format!(
1661                            "x11: error loading cursor icon, falling back on default icon '{}'",
1662                            DEFAULT_CURSOR_ICON_NAME
1663                        )));
1664                        Some(default)
1665                    }
1666                    Err(default_err) => {
1667                        log_cursor_icon_warning(err.context(default_err).context(format!(
1668                            "x11: error loading default cursor fallback '{}'",
1669                            DEFAULT_CURSOR_ICON_NAME
1670                        )));
1671                        None
1672                    }
1673                }
1674            }
1675        };
1676
1677        self.cursor_cache.insert(style, cursor);
1678        cursor
1679    }
1680}
1681
1682// Adapted from:
1683// https://docs.rs/winit/0.29.11/src/winit/platform_impl/linux/x11/monitor.rs.html#103-111
1684pub fn mode_refresh_rate(mode: &randr::ModeInfo) -> Duration {
1685    if mode.dot_clock == 0 || mode.htotal == 0 || mode.vtotal == 0 {
1686        return Duration::from_millis(16);
1687    }
1688
1689    let millihertz = mode.dot_clock as u64 * 1_000 / (mode.htotal as u64 * mode.vtotal as u64);
1690    let micros = 1_000_000_000 / millihertz;
1691    log::info!("Refreshing at {} micros", micros);
1692    Duration::from_micros(micros)
1693}
1694
1695fn fp3232_to_f32(value: xinput::Fp3232) -> f32 {
1696    value.integral as f32 + value.frac as f32 / u32::MAX as f32
1697}
1698
1699fn check_compositor_present(xcb_connection: &XCBConnection, root: u32) -> bool {
1700    // Method 1: Check for _NET_WM_CM_S{root}
1701    let atom_name = format!("_NET_WM_CM_S{}", root);
1702    let atom = xcb_connection
1703        .intern_atom(false, atom_name.as_bytes())
1704        .unwrap()
1705        .reply()
1706        .map(|reply| reply.atom)
1707        .unwrap_or(0);
1708
1709    let method1 = if atom != 0 {
1710        xcb_connection
1711            .get_selection_owner(atom)
1712            .unwrap()
1713            .reply()
1714            .map(|reply| reply.owner != 0)
1715            .unwrap_or(false)
1716    } else {
1717        false
1718    };
1719
1720    // Method 2: Check for _NET_WM_CM_OWNER
1721    let atom_name = "_NET_WM_CM_OWNER";
1722    let atom = xcb_connection
1723        .intern_atom(false, atom_name.as_bytes())
1724        .unwrap()
1725        .reply()
1726        .map(|reply| reply.atom)
1727        .unwrap_or(0);
1728
1729    let method2 = if atom != 0 {
1730        xcb_connection
1731            .get_property(false, root, atom, xproto::AtomEnum::WINDOW, 0, 1)
1732            .unwrap()
1733            .reply()
1734            .map(|reply| reply.value_len > 0)
1735            .unwrap_or(false)
1736    } else {
1737        false
1738    };
1739
1740    // Method 3: Check for _NET_SUPPORTING_WM_CHECK
1741    let atom_name = "_NET_SUPPORTING_WM_CHECK";
1742    let atom = xcb_connection
1743        .intern_atom(false, atom_name.as_bytes())
1744        .unwrap()
1745        .reply()
1746        .map(|reply| reply.atom)
1747        .unwrap_or(0);
1748
1749    let method3 = if atom != 0 {
1750        xcb_connection
1751            .get_property(false, root, atom, xproto::AtomEnum::WINDOW, 0, 1)
1752            .unwrap()
1753            .reply()
1754            .map(|reply| reply.value_len > 0)
1755            .unwrap_or(false)
1756    } else {
1757        false
1758    };
1759
1760    // TODO: Remove this
1761    log::info!(
1762        "Compositor detection: _NET_WM_CM_S?={}, _NET_WM_CM_OWNER={}, _NET_SUPPORTING_WM_CHECK={}",
1763        method1,
1764        method2,
1765        method3
1766    );
1767
1768    method1 || method2 || method3
1769}
1770
1771fn check_gtk_frame_extents_supported(
1772    xcb_connection: &XCBConnection,
1773    atoms: &XcbAtoms,
1774    root: xproto::Window,
1775) -> bool {
1776    let supported_atoms = xcb_connection
1777        .get_property(
1778            false,
1779            root,
1780            atoms._NET_SUPPORTED,
1781            xproto::AtomEnum::ATOM,
1782            0,
1783            1024,
1784        )
1785        .unwrap()
1786        .reply()
1787        .map(|reply| {
1788            // Convert Vec<u8> to Vec<u32>
1789            reply
1790                .value
1791                .chunks_exact(4)
1792                .map(|chunk| u32::from_ne_bytes([chunk[0], chunk[1], chunk[2], chunk[3]]))
1793                .collect::<Vec<u32>>()
1794        })
1795        .unwrap_or_default();
1796
1797    supported_atoms.contains(&atoms._GTK_FRAME_EXTENTS)
1798}
1799
1800fn xdnd_is_atom_supported(atom: u32, atoms: &XcbAtoms) -> bool {
1801    return atom == atoms.TEXT
1802        || atom == atoms.STRING
1803        || atom == atoms.UTF8_STRING
1804        || atom == atoms.TEXT_PLAIN
1805        || atom == atoms.TEXT_PLAIN_UTF8
1806        || atom == atoms.TextUriList;
1807}
1808
1809fn xdnd_get_supported_atom(
1810    xcb_connection: &XCBConnection,
1811    supported_atoms: &XcbAtoms,
1812    target: xproto::Window,
1813) -> u32 {
1814    let property = xcb_connection
1815        .get_property(
1816            false,
1817            target,
1818            supported_atoms.XdndTypeList,
1819            AtomEnum::ANY,
1820            0,
1821            1024,
1822        )
1823        .unwrap();
1824    if let Ok(reply) = property.reply() {
1825        if let Some(atoms) = reply.value32() {
1826            for atom in atoms {
1827                if xdnd_is_atom_supported(atom, &supported_atoms) {
1828                    return atom;
1829                }
1830            }
1831        }
1832    }
1833    return 0;
1834}
1835
1836fn xdnd_send_finished(
1837    xcb_connection: &XCBConnection,
1838    atoms: &XcbAtoms,
1839    source: xproto::Window,
1840    target: xproto::Window,
1841) {
1842    let message = ClientMessageEvent {
1843        format: 32,
1844        window: target,
1845        type_: atoms.XdndFinished,
1846        data: ClientMessageData::from([source, 1, atoms.XdndActionCopy, 0, 0]),
1847        sequence: 0,
1848        response_type: xproto::CLIENT_MESSAGE_EVENT,
1849    };
1850    xcb_connection
1851        .send_event(false, target, EventMask::default(), message)
1852        .unwrap();
1853}
1854
1855fn xdnd_send_status(
1856    xcb_connection: &XCBConnection,
1857    atoms: &XcbAtoms,
1858    source: xproto::Window,
1859    target: xproto::Window,
1860    action: u32,
1861) {
1862    let message = ClientMessageEvent {
1863        format: 32,
1864        window: target,
1865        type_: atoms.XdndStatus,
1866        data: ClientMessageData::from([source, 1, 0, 0, action]),
1867        sequence: 0,
1868        response_type: xproto::CLIENT_MESSAGE_EVENT,
1869    };
1870    xcb_connection
1871        .send_event(false, target, EventMask::default(), message)
1872        .unwrap();
1873}
1874
1875/// Recomputes `pointer_device_states` by querying all pointer devices.
1876/// When a device is present in `scroll_values_to_preserve`, its value for `ScrollAxisState.scroll_value` is used.
1877fn get_new_pointer_device_states(
1878    xcb_connection: &XCBConnection,
1879    scroll_values_to_preserve: &BTreeMap<xinput::DeviceId, PointerDeviceState>,
1880) -> BTreeMap<xinput::DeviceId, PointerDeviceState> {
1881    let devices_query_result = xcb_connection
1882        .xinput_xi_query_device(XINPUT_ALL_DEVICES)
1883        .unwrap()
1884        .reply()
1885        .unwrap();
1886
1887    let mut pointer_device_states = BTreeMap::new();
1888    pointer_device_states.extend(
1889        devices_query_result
1890            .infos
1891            .iter()
1892            .filter(|info| is_pointer_device(info.type_))
1893            .filter_map(|info| {
1894                let scroll_data = info
1895                    .classes
1896                    .iter()
1897                    .filter_map(|class| class.data.as_scroll())
1898                    .map(|class| *class)
1899                    .rev()
1900                    .collect::<Vec<_>>();
1901                let old_state = scroll_values_to_preserve.get(&info.deviceid);
1902                let old_horizontal = old_state.map(|state| &state.horizontal);
1903                let old_vertical = old_state.map(|state| &state.vertical);
1904                let horizontal = scroll_data
1905                    .iter()
1906                    .find(|data| data.scroll_type == xinput::ScrollType::HORIZONTAL)
1907                    .map(|data| scroll_data_to_axis_state(data, old_horizontal));
1908                let vertical = scroll_data
1909                    .iter()
1910                    .find(|data| data.scroll_type == xinput::ScrollType::VERTICAL)
1911                    .map(|data| scroll_data_to_axis_state(data, old_vertical));
1912                if horizontal.is_none() && vertical.is_none() {
1913                    None
1914                } else {
1915                    Some((
1916                        info.deviceid,
1917                        PointerDeviceState {
1918                            horizontal: horizontal.unwrap_or_else(Default::default),
1919                            vertical: vertical.unwrap_or_else(Default::default),
1920                        },
1921                    ))
1922                }
1923            }),
1924    );
1925    if pointer_device_states.is_empty() {
1926        log::error!("Found no xinput mouse pointers.");
1927    }
1928    return pointer_device_states;
1929}
1930
1931/// Returns true if the device is a pointer device. Does not include pointer device groups.
1932fn is_pointer_device(type_: xinput::DeviceType) -> bool {
1933    type_ == xinput::DeviceType::SLAVE_POINTER
1934}
1935
1936fn scroll_data_to_axis_state(
1937    data: &xinput::DeviceClassDataScroll,
1938    old_axis_state_with_valid_scroll_value: Option<&ScrollAxisState>,
1939) -> ScrollAxisState {
1940    ScrollAxisState {
1941        valuator_number: Some(data.number),
1942        multiplier: SCROLL_LINES / fp3232_to_f32(data.increment),
1943        scroll_value: old_axis_state_with_valid_scroll_value.and_then(|state| state.scroll_value),
1944    }
1945}
1946
1947fn reset_all_pointer_device_scroll_positions(
1948    pointer_device_states: &mut BTreeMap<xinput::DeviceId, PointerDeviceState>,
1949) {
1950    pointer_device_states
1951        .iter_mut()
1952        .for_each(|(_, device_state)| reset_pointer_device_scroll_positions(device_state));
1953}
1954
1955fn reset_pointer_device_scroll_positions(pointer: &mut PointerDeviceState) {
1956    pointer.horizontal.scroll_value = None;
1957    pointer.vertical.scroll_value = None;
1958}
1959
1960/// Returns the scroll delta for a smooth scrolling motion event, or `None` if no scroll data is present.
1961fn get_scroll_delta_and_update_state(
1962    pointer: &mut PointerDeviceState,
1963    event: &xinput::MotionEvent,
1964) -> Option<Point<f32>> {
1965    let delta_x = get_axis_scroll_delta_and_update_state(event, &mut pointer.horizontal);
1966    let delta_y = get_axis_scroll_delta_and_update_state(event, &mut pointer.vertical);
1967    if delta_x.is_some() || delta_y.is_some() {
1968        Some(Point::new(delta_x.unwrap_or(0.0), delta_y.unwrap_or(0.0)))
1969    } else {
1970        None
1971    }
1972}
1973
1974fn get_axis_scroll_delta_and_update_state(
1975    event: &xinput::MotionEvent,
1976    axis: &mut ScrollAxisState,
1977) -> Option<f32> {
1978    let axis_index = get_valuator_axis_index(&event.valuator_mask, axis.valuator_number?)?;
1979    if let Some(axis_value) = event.axisvalues.get(axis_index) {
1980        let new_scroll = fp3232_to_f32(*axis_value);
1981        let delta_scroll = axis
1982            .scroll_value
1983            .map(|old_scroll| (old_scroll - new_scroll) * axis.multiplier);
1984        axis.scroll_value = Some(new_scroll);
1985        delta_scroll
1986    } else {
1987        log::error!("Encountered invalid XInput valuator_mask, scrolling may not work properly.");
1988        None
1989    }
1990}
1991
1992fn make_scroll_wheel_event(
1993    position: Point<Pixels>,
1994    scroll_delta: Point<f32>,
1995    modifiers: Modifiers,
1996) -> crate::ScrollWheelEvent {
1997    // When shift is held down, vertical scrolling turns into horizontal scrolling.
1998    let delta = if modifiers.shift {
1999        Point {
2000            x: scroll_delta.y,
2001            y: 0.0,
2002        }
2003    } else {
2004        scroll_delta
2005    };
2006    crate::ScrollWheelEvent {
2007        position,
2008        delta: ScrollDelta::Lines(delta),
2009        modifiers,
2010        touch_phase: TouchPhase::default(),
2011    }
2012}
2013
2014fn create_invisible_cursor(
2015    connection: &XCBConnection,
2016) -> anyhow::Result<crate::platform::linux::x11::client::xproto::Cursor> {
2017    let empty_pixmap = connection.generate_id()?;
2018    let root = connection.setup().roots[0].root;
2019    connection.create_pixmap(1, empty_pixmap, root, 1, 1)?;
2020
2021    let cursor = connection.generate_id()?;
2022    connection.create_cursor(cursor, empty_pixmap, empty_pixmap, 0, 0, 0, 0, 0, 0, 0, 0)?;
2023
2024    connection.free_pixmap(empty_pixmap)?;
2025
2026    connection.flush()?;
2027    Ok(cursor)
2028}