use core::str; use std::cell::RefCell; use std::collections::{BTreeMap, HashSet}; use std::ops::Deref; use std::path::PathBuf; use std::rc::{Rc, Weak}; use std::time::{Duration, Instant}; use calloop::generic::{FdWrapper, Generic}; use calloop::{EventLoop, LoopHandle, RegistrationToken}; use collections::HashMap; use http_client::Url; use smallvec::SmallVec; use util::ResultExt; use x11rb::connection::{Connection, RequestConnection}; use x11rb::cursor; use x11rb::errors::ConnectionError; use x11rb::protocol::randr::ConnectionExt as _; use x11rb::protocol::xinput::ConnectionExt; use x11rb::protocol::xkb::ConnectionExt as _; use x11rb::protocol::xproto::{ AtomEnum, ChangeWindowAttributesAux, ClientMessageData, ClientMessageEvent, ConnectionExt as _, EventMask, KeyPressEvent, }; use x11rb::protocol::{randr, render, xinput, xkb, xproto, Event}; use x11rb::resource_manager::Database; use x11rb::wrapper::ConnectionExt as _; use x11rb::xcb_ffi::XCBConnection; use xim::{x11rb::X11rbClient, Client}; use xim::{AttributeName, InputStyle}; use xkbc::x11::ffi::{XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION}; use xkbcommon::xkb::{self as xkbc, LayoutIndex, ModMask}; use crate::platform::linux::LinuxClient; use crate::platform::{LinuxCommon, PlatformWindow}; use crate::{ modifiers_from_xinput_info, point, px, AnyWindowHandle, Bounds, ClipboardItem, CursorStyle, DisplayId, FileDropEvent, Keystroke, Modifiers, ModifiersChangedEvent, MouseButton, Pixels, Platform, PlatformDisplay, PlatformInput, Point, RequestFrameOptions, ScaledPixels, ScrollDelta, Size, TouchPhase, WindowParams, X11Window, }; use super::{ button_or_scroll_from_event_detail, get_valuator_axis_index, modifiers_from_state, pressed_button_from_mask, ButtonOrScroll, ScrollDirection, }; use super::{X11Display, X11WindowStatePtr, XcbAtoms}; use super::{XimCallbackEvent, XimHandler}; use crate::platform::linux::platform::{DOUBLE_CLICK_INTERVAL, SCROLL_LINES}; use crate::platform::linux::xdg_desktop_portal::{Event as XDPEvent, XDPEventSource}; use crate::platform::linux::{ get_xkb_compose_state, is_within_click_distance, open_uri_internal, reveal_path_internal, }; /// Value for DeviceId parameters which selects all devices. pub(crate) const XINPUT_ALL_DEVICES: xinput::DeviceId = 0; /// Value for DeviceId parameters which selects all device groups. Events that /// occur within the group are emitted by the group itself. /// /// In XInput 2's interface, these are referred to as "master devices", but that /// terminology is both archaic and unclear. pub(crate) const XINPUT_ALL_DEVICE_GROUPS: xinput::DeviceId = 1; pub(crate) struct WindowRef { window: X11WindowStatePtr, refresh_event_token: RegistrationToken, } impl WindowRef { pub fn handle(&self) -> AnyWindowHandle { self.window.state.borrow().handle } } impl Deref for WindowRef { type Target = X11WindowStatePtr; fn deref(&self) -> &Self::Target { &self.window } } #[derive(Debug)] #[non_exhaustive] pub enum EventHandlerError { XCBConnectionError(ConnectionError), XIMClientError(xim::ClientError), } impl std::error::Error for EventHandlerError {} impl std::fmt::Display for EventHandlerError { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { match self { EventHandlerError::XCBConnectionError(err) => err.fmt(f), EventHandlerError::XIMClientError(err) => err.fmt(f), } } } impl From for EventHandlerError { fn from(err: ConnectionError) -> Self { EventHandlerError::XCBConnectionError(err) } } impl From for EventHandlerError { fn from(err: xim::ClientError) -> Self { EventHandlerError::XIMClientError(err) } } #[derive(Debug, Default, Clone)] struct XKBStateNotiy { depressed_layout: LayoutIndex, latched_layout: LayoutIndex, locked_layout: LayoutIndex, } #[derive(Debug, Default)] pub struct Xdnd { other_window: xproto::Window, drag_type: u32, retrieved: bool, position: Point, } #[derive(Debug)] struct PointerDeviceState { horizontal: ScrollAxisState, vertical: ScrollAxisState, } #[derive(Debug, Default)] struct ScrollAxisState { /// Valuator number for looking up this axis's scroll value. valuator_number: Option, /// Conversion factor from scroll units to lines. multiplier: f32, /// Last scroll value for calculating scroll delta. /// /// This gets set to `None` whenever it might be invalid - when devices change or when window focus changes. /// The logic errs on the side of invalidating this, since the consequence is just skipping the delta of one scroll event. /// The consequence of not invalidating it can be large invalid deltas, which are much more user visible. scroll_value: Option, } pub struct X11ClientState { pub(crate) loop_handle: LoopHandle<'static, X11Client>, pub(crate) event_loop: Option>, pub(crate) last_click: Instant, pub(crate) last_mouse_button: Option, pub(crate) last_location: Point, pub(crate) current_count: usize, pub(crate) scale_factor: f32, xkb_context: xkbc::Context, pub(crate) xcb_connection: Rc, xkb_device_id: i32, client_side_decorations_supported: bool, pub(crate) x_root_index: usize, pub(crate) _resource_database: Database, pub(crate) atoms: XcbAtoms, pub(crate) windows: HashMap, pub(crate) mouse_focused_window: Option, pub(crate) keyboard_focused_window: Option, pub(crate) xkb: xkbc::State, previous_xkb_state: XKBStateNotiy, pub(crate) ximc: Option>>, pub(crate) xim_handler: Option, pub modifiers: Modifiers, pub(crate) compose_state: Option, pub(crate) pre_edit_text: Option, pub(crate) composing: bool, pub(crate) pre_key_char_down: Option, pub(crate) cursor_handle: cursor::Handle, pub(crate) cursor_styles: HashMap, pub(crate) cursor_cache: HashMap, pointer_device_states: BTreeMap, pub(crate) common: LinuxCommon, pub(crate) clipboard: x11_clipboard::Clipboard, pub(crate) clipboard_item: Option, pub(crate) xdnd_state: Xdnd, } #[derive(Clone)] pub struct X11ClientStatePtr(pub Weak>); impl X11ClientStatePtr { fn get_client(&self) -> X11Client { X11Client(self.0.upgrade().expect("client already dropped")) } pub fn drop_window(&self, x_window: u32) { let client = self.get_client(); let mut state = client.0.borrow_mut(); if let Some(window_ref) = state.windows.remove(&x_window) { state.loop_handle.remove(window_ref.refresh_event_token); } if state.mouse_focused_window == Some(x_window) { state.mouse_focused_window = None; } if state.keyboard_focused_window == Some(x_window) { state.keyboard_focused_window = None; } state.cursor_styles.remove(&x_window); if state.windows.is_empty() { state.common.signal.stop(); } } pub fn update_ime_position(&self, bounds: Bounds) { let client = self.get_client(); let mut state = client.0.borrow_mut(); if state.composing || state.ximc.is_none() { return; } let mut ximc = state.ximc.take().unwrap(); let xim_handler = state.xim_handler.take().unwrap(); let ic_attributes = ximc .build_ic_attributes() .push( xim::AttributeName::InputStyle, xim::InputStyle::PREEDIT_CALLBACKS, ) .push(xim::AttributeName::ClientWindow, xim_handler.window) .push(xim::AttributeName::FocusWindow, xim_handler.window) .nested_list(xim::AttributeName::PreeditAttributes, |b| { b.push( xim::AttributeName::SpotLocation, xim::Point { x: u32::from(bounds.origin.x + bounds.size.width) as i16, y: u32::from(bounds.origin.y + bounds.size.height) as i16, }, ); }) .build(); let _ = ximc .set_ic_values(xim_handler.im_id, xim_handler.ic_id, ic_attributes) .log_err(); state.ximc = Some(ximc); state.xim_handler = Some(xim_handler); } } #[derive(Clone)] pub(crate) struct X11Client(Rc>); impl X11Client { pub(crate) fn new() -> Self { let event_loop = EventLoop::try_new().unwrap(); let (common, main_receiver) = LinuxCommon::new(event_loop.get_signal()); let handle = event_loop.handle(); handle .insert_source(main_receiver, { let handle = handle.clone(); move |event, _, _: &mut X11Client| { if let calloop::channel::Event::Msg(runnable) = event { // Insert the runnables as idle callbacks, so we make sure that user-input and X11 // events have higher priority and runnables are only worked off after the event // callbacks. handle.insert_idle(|_| { runnable.run(); }); } } }) .unwrap(); let (xcb_connection, x_root_index) = XCBConnection::connect(None).unwrap(); xcb_connection .prefetch_extension_information(xkb::X11_EXTENSION_NAME) .unwrap(); xcb_connection .prefetch_extension_information(randr::X11_EXTENSION_NAME) .unwrap(); xcb_connection .prefetch_extension_information(render::X11_EXTENSION_NAME) .unwrap(); xcb_connection .prefetch_extension_information(xinput::X11_EXTENSION_NAME) .unwrap(); // Announce to X server that XInput up to 2.1 is supported. To increase this to 2.2 and // beyond, support for touch events would need to be added. let xinput_version = xcb_connection .xinput_xi_query_version(2, 1) .unwrap() .reply() .unwrap(); // XInput 1.x is not supported. assert!( xinput_version.major_version >= 2, "XInput version >= 2 required." ); let pointer_device_states = get_new_pointer_device_states(&xcb_connection, &BTreeMap::new()); let atoms = XcbAtoms::new(&xcb_connection).unwrap().reply().unwrap(); let root = xcb_connection.setup().roots[0].root; let compositor_present = check_compositor_present(&xcb_connection, root); let gtk_frame_extents_supported = check_gtk_frame_extents_supported(&xcb_connection, &atoms, root); let client_side_decorations_supported = compositor_present && gtk_frame_extents_supported; log::info!( "x11: compositor present: {}, gtk_frame_extents_supported: {}", compositor_present, gtk_frame_extents_supported ); let xkb = xcb_connection .xkb_use_extension(XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION) .unwrap() .reply() .unwrap(); let events = xkb::EventType::STATE_NOTIFY | xkb::EventType::MAP_NOTIFY | xkb::EventType::NEW_KEYBOARD_NOTIFY; xcb_connection .xkb_select_events( xkb::ID::USE_CORE_KBD.into(), 0u8.into(), events, 0u8.into(), 0u8.into(), &xkb::SelectEventsAux::new(), ) .unwrap(); assert!(xkb.supported); let xkb_context = xkbc::Context::new(xkbc::CONTEXT_NO_FLAGS); let xkb_device_id = xkbc::x11::get_core_keyboard_device_id(&xcb_connection); let xkb_state = { let xkb_keymap = xkbc::x11::keymap_new_from_device( &xkb_context, &xcb_connection, xkb_device_id, xkbc::KEYMAP_COMPILE_NO_FLAGS, ); xkbc::x11::state_new_from_device(&xkb_keymap, &xcb_connection, xkb_device_id) }; let compose_state = get_xkb_compose_state(&xkb_context); let resource_database = x11rb::resource_manager::new_from_default(&xcb_connection).unwrap(); let scale_factor = resource_database .get_value("Xft.dpi", "Xft.dpi") .ok() .flatten() .map(|dpi: f32| dpi / 96.0) .unwrap_or(1.0); let cursor_handle = cursor::Handle::new(&xcb_connection, x_root_index, &resource_database) .unwrap() .reply() .unwrap(); let clipboard = x11_clipboard::Clipboard::new().unwrap(); let xcb_connection = Rc::new(xcb_connection); let ximc = X11rbClient::init(Rc::clone(&xcb_connection), x_root_index, None).ok(); let xim_handler = if ximc.is_some() { Some(XimHandler::new()) } else { None }; // Safety: Safe if xcb::Connection always returns a valid fd let fd = unsafe { FdWrapper::new(Rc::clone(&xcb_connection)) }; handle .insert_source( Generic::new_with_error::( fd, calloop::Interest::READ, calloop::Mode::Level, ), { let xcb_connection = xcb_connection.clone(); move |_readiness, _, client| { client.process_x11_events(&xcb_connection)?; Ok(calloop::PostAction::Continue) } }, ) .expect("Failed to initialize x11 event source"); handle .insert_source(XDPEventSource::new(&common.background_executor), { move |event, _, client| match event { XDPEvent::WindowAppearance(appearance) => { client.with_common(|common| common.appearance = appearance); for (_, window) in &mut client.0.borrow_mut().windows { window.window.set_appearance(appearance); } } XDPEvent::CursorTheme(_) | XDPEvent::CursorSize(_) => { // noop, X11 manages this for us. } } }) .unwrap(); X11Client(Rc::new(RefCell::new(X11ClientState { modifiers: Modifiers::default(), event_loop: Some(event_loop), loop_handle: handle, common, last_click: Instant::now(), last_mouse_button: None, last_location: Point::new(px(0.0), px(0.0)), current_count: 0, scale_factor, xkb_context, xcb_connection, xkb_device_id, client_side_decorations_supported, x_root_index, _resource_database: resource_database, atoms, windows: HashMap::default(), mouse_focused_window: None, keyboard_focused_window: None, xkb: xkb_state, previous_xkb_state: XKBStateNotiy::default(), ximc, xim_handler, compose_state, pre_edit_text: None, pre_key_char_down: None, composing: false, cursor_handle, cursor_styles: HashMap::default(), cursor_cache: HashMap::default(), pointer_device_states, clipboard, clipboard_item: None, xdnd_state: Xdnd::default(), }))) } pub fn process_x11_events( &self, xcb_connection: &XCBConnection, ) -> Result<(), EventHandlerError> { loop { let mut events = Vec::new(); let mut windows_to_refresh = HashSet::new(); let mut last_key_release = None; let mut last_key_press: Option = None; loop { match xcb_connection.poll_for_event() { Ok(Some(event)) => { match event { Event::Expose(expose_event) => { windows_to_refresh.insert(expose_event.window); } Event::KeyRelease(_) => { last_key_release = Some(event); } Event::KeyPress(key_press) => { if let Some(last_press) = last_key_press.as_ref() { if last_press.detail == key_press.detail { continue; } } if let Some(Event::KeyRelease(key_release)) = last_key_release.take() { // We ignore that last KeyRelease if it's too close to this KeyPress, // suggesting that it's auto-generated by X11 as a key-repeat event. if key_release.detail != key_press.detail || key_press.time.saturating_sub(key_release.time) > 20 { events.push(Event::KeyRelease(key_release)); } } events.push(Event::KeyPress(key_press)); last_key_press = Some(key_press); } _ => { if let Some(release_event) = last_key_release.take() { events.push(release_event); } events.push(event); } } } Ok(None) => { // Add any remaining stored KeyRelease event if let Some(release_event) = last_key_release.take() { events.push(release_event); } break; } Err(e) => { log::warn!("error polling for X11 events: {e:?}"); break; } } } if events.is_empty() && windows_to_refresh.is_empty() { break; } for window in windows_to_refresh.into_iter() { if let Some(window) = self.get_window(window) { window.refresh(RequestFrameOptions { require_presentation: true, }); } } for event in events.into_iter() { let mut state = self.0.borrow_mut(); if state.ximc.is_none() || state.xim_handler.is_none() { drop(state); self.handle_event(event); continue; } let mut ximc = state.ximc.take().unwrap(); let mut xim_handler = state.xim_handler.take().unwrap(); let xim_connected = xim_handler.connected; drop(state); let xim_filtered = match ximc.filter_event(&event, &mut xim_handler) { Ok(handled) => handled, Err(err) => { log::error!("XIMClientError: {}", err); false } }; let xim_callback_event = xim_handler.last_callback_event.take(); let mut state = self.0.borrow_mut(); state.ximc = Some(ximc); state.xim_handler = Some(xim_handler); drop(state); if let Some(event) = xim_callback_event { self.handle_xim_callback_event(event); } if xim_filtered { continue; } if xim_connected { self.xim_handle_event(event); } else { self.handle_event(event); } } } Ok(()) } pub fn enable_ime(&self) { let mut state = self.0.borrow_mut(); if state.ximc.is_none() { return; } let mut ximc = state.ximc.take().unwrap(); let mut xim_handler = state.xim_handler.take().unwrap(); let mut ic_attributes = ximc .build_ic_attributes() .push(AttributeName::InputStyle, InputStyle::PREEDIT_CALLBACKS) .push(AttributeName::ClientWindow, xim_handler.window) .push(AttributeName::FocusWindow, xim_handler.window); let window_id = state.keyboard_focused_window; drop(state); if let Some(window_id) = window_id { let window = self.get_window(window_id).unwrap(); if let Some(area) = window.get_ime_area() { ic_attributes = ic_attributes.nested_list(xim::AttributeName::PreeditAttributes, |b| { b.push( xim::AttributeName::SpotLocation, xim::Point { x: u32::from(area.origin.x + area.size.width) as i16, y: u32::from(area.origin.y + area.size.height) as i16, }, ); }); } } ximc.create_ic(xim_handler.im_id, ic_attributes.build()) .ok(); state = self.0.borrow_mut(); state.xim_handler = Some(xim_handler); state.ximc = Some(ximc); } pub fn reset_ime(&self) { let mut state = self.0.borrow_mut(); state.composing = false; if let Some(mut ximc) = state.ximc.take() { let xim_handler = state.xim_handler.as_ref().unwrap(); ximc.reset_ic(xim_handler.im_id, xim_handler.ic_id).ok(); state.ximc = Some(ximc); } } fn get_window(&self, win: xproto::Window) -> Option { let state = self.0.borrow(); state .windows .get(&win) .filter(|window_reference| !window_reference.window.state.borrow().destroyed) .map(|window_reference| window_reference.window.clone()) } fn handle_event(&self, event: Event) -> Option<()> { match event { Event::ClientMessage(event) => { let window = self.get_window(event.window)?; let [atom, arg1, arg2, arg3, arg4] = event.data.as_data32(); let mut state = self.0.borrow_mut(); if atom == state.atoms.WM_DELETE_WINDOW { // window "x" button clicked by user if window.should_close() { // Rest of the close logic is handled in drop_window() window.close(); } } else if atom == state.atoms._NET_WM_SYNC_REQUEST { window.state.borrow_mut().last_sync_counter = Some(x11rb::protocol::sync::Int64 { lo: arg2, hi: arg3 as i32, }) } if event.type_ == state.atoms.XdndEnter { state.xdnd_state.other_window = atom; if (arg1 & 0x1) == 0x1 { state.xdnd_state.drag_type = xdnd_get_supported_atom( &state.xcb_connection, &state.atoms, state.xdnd_state.other_window, ); } else { if let Some(atom) = [arg2, arg3, arg4] .into_iter() .find(|atom| xdnd_is_atom_supported(*atom, &state.atoms)) { state.xdnd_state.drag_type = atom; } } } else if event.type_ == state.atoms.XdndLeave { let position = state.xdnd_state.position; drop(state); window .handle_input(PlatformInput::FileDrop(FileDropEvent::Pending { position })); window.handle_input(PlatformInput::FileDrop(FileDropEvent::Exited {})); self.0.borrow_mut().xdnd_state = Xdnd::default(); } else if event.type_ == state.atoms.XdndPosition { if let Ok(pos) = state .xcb_connection .query_pointer(event.window) .unwrap() .reply() { state.xdnd_state.position = Point::new(Pixels(pos.win_x as f32), Pixels(pos.win_y as f32)); } if !state.xdnd_state.retrieved { state .xcb_connection .convert_selection( event.window, state.atoms.XdndSelection, state.xdnd_state.drag_type, state.atoms.XDND_DATA, arg3, ) .unwrap(); } xdnd_send_status( &state.xcb_connection, &state.atoms, event.window, state.xdnd_state.other_window, arg4, ); let position = state.xdnd_state.position; drop(state); window .handle_input(PlatformInput::FileDrop(FileDropEvent::Pending { position })); } else if event.type_ == state.atoms.XdndDrop { xdnd_send_finished( &state.xcb_connection, &state.atoms, event.window, state.xdnd_state.other_window, ); let position = state.xdnd_state.position; drop(state); window .handle_input(PlatformInput::FileDrop(FileDropEvent::Submit { position })); self.0.borrow_mut().xdnd_state = Xdnd::default(); } } Event::SelectionNotify(event) => { let window = self.get_window(event.requestor)?; let mut state = self.0.borrow_mut(); let property = state.xcb_connection.get_property( false, event.requestor, state.atoms.XDND_DATA, AtomEnum::ANY, 0, 1024, ); if property.as_ref().log_err().is_none() { return Some(()); } if let Ok(reply) = property.unwrap().reply() { match str::from_utf8(&reply.value) { Ok(file_list) => { let paths: SmallVec<[_; 2]> = file_list .lines() .filter_map(|path| Url::parse(path).log_err()) .filter_map(|url| url.to_file_path().log_err()) .collect(); let input = PlatformInput::FileDrop(FileDropEvent::Entered { position: state.xdnd_state.position, paths: crate::ExternalPaths(paths), }); drop(state); window.handle_input(input); self.0.borrow_mut().xdnd_state.retrieved = true; } Err(_) => {} } } } Event::ConfigureNotify(event) => { let bounds = Bounds { origin: Point { x: event.x.into(), y: event.y.into(), }, size: Size { width: event.width.into(), height: event.height.into(), }, }; let window = self.get_window(event.window)?; window.configure(bounds).unwrap(); } Event::PropertyNotify(event) => { let window = self.get_window(event.window)?; window.property_notify(event).unwrap(); } Event::FocusIn(event) => { let window = self.get_window(event.event)?; window.set_active(true); let mut state = self.0.borrow_mut(); state.keyboard_focused_window = Some(event.event); if let Some(handler) = state.xim_handler.as_mut() { handler.window = event.event; } drop(state); self.enable_ime(); } Event::FocusOut(event) => { let window = self.get_window(event.event)?; window.set_active(false); let mut state = self.0.borrow_mut(); state.keyboard_focused_window = None; if let Some(compose_state) = state.compose_state.as_mut() { compose_state.reset(); } state.pre_edit_text.take(); drop(state); self.reset_ime(); window.handle_ime_delete(); } Event::XkbNewKeyboardNotify(_) | Event::MapNotify(_) => { let mut state = self.0.borrow_mut(); let xkb_state = { let xkb_keymap = xkbc::x11::keymap_new_from_device( &state.xkb_context, &state.xcb_connection, state.xkb_device_id, xkbc::KEYMAP_COMPILE_NO_FLAGS, ); xkbc::x11::state_new_from_device( &xkb_keymap, &state.xcb_connection, state.xkb_device_id, ) }; state.xkb = xkb_state; } Event::XkbStateNotify(event) => { let mut state = self.0.borrow_mut(); state.xkb.update_mask( event.base_mods.into(), event.latched_mods.into(), event.locked_mods.into(), event.base_group as u32, event.latched_group as u32, event.locked_group.into(), ); state.previous_xkb_state = XKBStateNotiy { depressed_layout: event.base_group as u32, latched_layout: event.latched_group as u32, locked_layout: event.locked_group.into(), }; let modifiers = Modifiers::from_xkb(&state.xkb); if state.modifiers == modifiers { drop(state); } else { let focused_window_id = state.keyboard_focused_window?; state.modifiers = modifiers; drop(state); let focused_window = self.get_window(focused_window_id)?; focused_window.handle_input(PlatformInput::ModifiersChanged( ModifiersChangedEvent { modifiers }, )); } } Event::KeyPress(event) => { let window = self.get_window(event.event)?; let mut state = self.0.borrow_mut(); let modifiers = modifiers_from_state(event.state); state.modifiers = modifiers; state.pre_key_char_down.take(); let keystroke = { let code = event.detail.into(); let xkb_state = state.previous_xkb_state.clone(); state.xkb.update_mask( event.state.bits() as ModMask, 0, 0, xkb_state.depressed_layout, xkb_state.latched_layout, xkb_state.locked_layout, ); let mut keystroke = crate::Keystroke::from_xkb(&state.xkb, modifiers, code); let keysym = state.xkb.key_get_one_sym(code); if keysym.is_modifier_key() { return Some(()); } if let Some(mut compose_state) = state.compose_state.take() { compose_state.feed(keysym); match compose_state.status() { xkbc::Status::Composed => { state.pre_edit_text.take(); keystroke.key_char = compose_state.utf8(); if let Some(keysym) = compose_state.keysym() { keystroke.key = xkbc::keysym_get_name(keysym); } } xkbc::Status::Composing => { keystroke.key_char = None; state.pre_edit_text = compose_state .utf8() .or(crate::Keystroke::underlying_dead_key(keysym)); let pre_edit = state.pre_edit_text.clone().unwrap_or(String::default()); drop(state); window.handle_ime_preedit(pre_edit); state = self.0.borrow_mut(); } xkbc::Status::Cancelled => { let pre_edit = state.pre_edit_text.take(); drop(state); if let Some(pre_edit) = pre_edit { window.handle_ime_commit(pre_edit); } if let Some(current_key) = Keystroke::underlying_dead_key(keysym) { window.handle_ime_preedit(current_key); } state = self.0.borrow_mut(); compose_state.feed(keysym); } _ => {} } state.compose_state = Some(compose_state); } keystroke }; drop(state); window.handle_input(PlatformInput::KeyDown(crate::KeyDownEvent { keystroke, is_held: false, })); } Event::KeyRelease(event) => { let window = self.get_window(event.event)?; let mut state = self.0.borrow_mut(); let modifiers = modifiers_from_state(event.state); state.modifiers = modifiers; let keystroke = { let code = event.detail.into(); let xkb_state = state.previous_xkb_state.clone(); state.xkb.update_mask( event.state.bits() as ModMask, 0, 0, xkb_state.depressed_layout, xkb_state.latched_layout, xkb_state.locked_layout, ); let keystroke = crate::Keystroke::from_xkb(&state.xkb, modifiers, code); let keysym = state.xkb.key_get_one_sym(code); if keysym.is_modifier_key() { return Some(()); } keystroke }; drop(state); window.handle_input(PlatformInput::KeyUp(crate::KeyUpEvent { keystroke })); } Event::XinputButtonPress(event) => { let window = self.get_window(event.event)?; let mut state = self.0.borrow_mut(); let modifiers = modifiers_from_xinput_info(event.mods); state.modifiers = modifiers; let position = point( px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor), px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor), ); if state.composing && state.ximc.is_some() { drop(state); self.reset_ime(); window.handle_ime_unmark(); state = self.0.borrow_mut(); } else if let Some(text) = state.pre_edit_text.take() { if let Some(compose_state) = state.compose_state.as_mut() { compose_state.reset(); } drop(state); window.handle_ime_commit(text); state = self.0.borrow_mut(); } match button_or_scroll_from_event_detail(event.detail) { Some(ButtonOrScroll::Button(button)) => { let click_elapsed = state.last_click.elapsed(); if click_elapsed < DOUBLE_CLICK_INTERVAL && state .last_mouse_button .is_some_and(|prev_button| prev_button == button) && is_within_click_distance(state.last_location, position) { state.current_count += 1; } else { state.current_count = 1; } state.last_click = Instant::now(); state.last_mouse_button = Some(button); state.last_location = position; let current_count = state.current_count; drop(state); window.handle_input(PlatformInput::MouseDown(crate::MouseDownEvent { button, position, modifiers, click_count: current_count, first_mouse: false, })); } Some(ButtonOrScroll::Scroll(direction)) => { drop(state); // Emulated scroll button presses are sent simultaneously with smooth scrolling XinputMotion events. // Since handling those events does the scrolling, they are skipped here. if !event .flags .contains(xinput::PointerEventFlags::POINTER_EMULATED) { let scroll_delta = match direction { ScrollDirection::Up => Point::new(0.0, SCROLL_LINES), ScrollDirection::Down => Point::new(0.0, -SCROLL_LINES), ScrollDirection::Left => Point::new(SCROLL_LINES, 0.0), ScrollDirection::Right => Point::new(-SCROLL_LINES, 0.0), }; window.handle_input(PlatformInput::ScrollWheel( make_scroll_wheel_event(position, scroll_delta, modifiers), )); } } None => { log::error!("Unknown x11 button: {}", event.detail); } } } Event::XinputButtonRelease(event) => { let window = self.get_window(event.event)?; let mut state = self.0.borrow_mut(); let modifiers = modifiers_from_xinput_info(event.mods); state.modifiers = modifiers; let position = point( px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor), px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor), ); match button_or_scroll_from_event_detail(event.detail) { Some(ButtonOrScroll::Button(button)) => { let click_count = state.current_count; drop(state); window.handle_input(PlatformInput::MouseUp(crate::MouseUpEvent { button, position, modifiers, click_count, })); } Some(ButtonOrScroll::Scroll(_)) => {} None => {} } } Event::XinputMotion(event) => { let window = self.get_window(event.event)?; let mut state = self.0.borrow_mut(); let pressed_button = pressed_button_from_mask(event.button_mask[0]); let position = point( px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor), px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor), ); let modifiers = modifiers_from_xinput_info(event.mods); state.modifiers = modifiers; drop(state); if event.valuator_mask[0] & 3 != 0 { window.handle_input(PlatformInput::MouseMove(crate::MouseMoveEvent { position, pressed_button, modifiers, })); } state = self.0.borrow_mut(); if let Some(mut pointer) = state.pointer_device_states.get_mut(&event.sourceid) { let scroll_delta = get_scroll_delta_and_update_state(&mut pointer, &event); drop(state); if let Some(scroll_delta) = scroll_delta { window.handle_input(PlatformInput::ScrollWheel(make_scroll_wheel_event( position, scroll_delta, modifiers, ))); } } } Event::XinputEnter(event) if event.mode == xinput::NotifyMode::NORMAL => { let window = self.get_window(event.event)?; window.set_hovered(true); let mut state = self.0.borrow_mut(); state.mouse_focused_window = Some(event.event); } Event::XinputLeave(event) if event.mode == xinput::NotifyMode::NORMAL => { let mut state = self.0.borrow_mut(); // 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) reset_all_pointer_device_scroll_positions(&mut state.pointer_device_states); state.mouse_focused_window = None; let pressed_button = pressed_button_from_mask(event.buttons[0]); let position = point( px(event.event_x as f32 / u16::MAX as f32 / state.scale_factor), px(event.event_y as f32 / u16::MAX as f32 / state.scale_factor), ); let modifiers = modifiers_from_xinput_info(event.mods); state.modifiers = modifiers; drop(state); let window = self.get_window(event.event)?; window.handle_input(PlatformInput::MouseExited(crate::MouseExitEvent { pressed_button, position, modifiers, })); window.set_hovered(false); } Event::XinputHierarchy(event) => { let mut state = self.0.borrow_mut(); // Temporarily use `state.pointer_device_states` to only store pointers that still have valid scroll values. // Any change to a device invalidates its scroll values. for info in event.infos { if is_pointer_device(info.type_) { state.pointer_device_states.remove(&info.deviceid); } } state.pointer_device_states = get_new_pointer_device_states( &state.xcb_connection, &state.pointer_device_states, ); } Event::XinputDeviceChanged(event) => { let mut state = self.0.borrow_mut(); if let Some(mut pointer) = state.pointer_device_states.get_mut(&event.sourceid) { reset_pointer_device_scroll_positions(&mut pointer); } } _ => {} }; Some(()) } fn handle_xim_callback_event(&self, event: XimCallbackEvent) { match event { XimCallbackEvent::XimXEvent(event) => { self.handle_event(event); } XimCallbackEvent::XimCommitEvent(window, text) => { self.xim_handle_commit(window, text); } XimCallbackEvent::XimPreeditEvent(window, text) => { self.xim_handle_preedit(window, text); } }; } fn xim_handle_event(&self, event: Event) -> Option<()> { match event { Event::KeyPress(event) | Event::KeyRelease(event) => { let mut state = self.0.borrow_mut(); state.pre_key_char_down = Some(Keystroke::from_xkb( &state.xkb, state.modifiers, event.detail.into(), )); let mut ximc = state.ximc.take().unwrap(); let mut xim_handler = state.xim_handler.take().unwrap(); drop(state); xim_handler.window = event.event; ximc.forward_event( xim_handler.im_id, xim_handler.ic_id, xim::ForwardEventFlag::empty(), &event, ) .unwrap(); let mut state = self.0.borrow_mut(); state.ximc = Some(ximc); state.xim_handler = Some(xim_handler); drop(state); } event => { self.handle_event(event); } } Some(()) } fn xim_handle_commit(&self, window: xproto::Window, text: String) -> Option<()> { let window = self.get_window(window).unwrap(); let mut state = self.0.borrow_mut(); let keystroke = state.pre_key_char_down.take(); state.composing = false; drop(state); if let Some(mut keystroke) = keystroke { keystroke.key_char = Some(text.clone()); window.handle_input(PlatformInput::KeyDown(crate::KeyDownEvent { keystroke, is_held: false, })); } Some(()) } fn xim_handle_preedit(&self, window: xproto::Window, text: String) -> Option<()> { let window = self.get_window(window).unwrap(); let mut state = self.0.borrow_mut(); let mut ximc = state.ximc.take().unwrap(); let mut xim_handler = state.xim_handler.take().unwrap(); state.composing = !text.is_empty(); drop(state); window.handle_ime_preedit(text); if let Some(area) = window.get_ime_area() { let ic_attributes = ximc .build_ic_attributes() .push( xim::AttributeName::InputStyle, xim::InputStyle::PREEDIT_CALLBACKS, ) .push(xim::AttributeName::ClientWindow, xim_handler.window) .push(xim::AttributeName::FocusWindow, xim_handler.window) .nested_list(xim::AttributeName::PreeditAttributes, |b| { b.push( xim::AttributeName::SpotLocation, xim::Point { x: u32::from(area.origin.x + area.size.width) as i16, y: u32::from(area.origin.y + area.size.height) as i16, }, ); }) .build(); ximc.set_ic_values(xim_handler.im_id, xim_handler.ic_id, ic_attributes) .ok(); } let mut state = self.0.borrow_mut(); state.ximc = Some(ximc); state.xim_handler = Some(xim_handler); drop(state); Some(()) } } impl LinuxClient for X11Client { fn compositor_name(&self) -> &'static str { "X11" } fn with_common(&self, f: impl FnOnce(&mut LinuxCommon) -> R) -> R { f(&mut self.0.borrow_mut().common) } fn displays(&self) -> Vec> { let state = self.0.borrow(); let setup = state.xcb_connection.setup(); setup .roots .iter() .enumerate() .filter_map(|(root_id, _)| { Some(Rc::new( X11Display::new(&state.xcb_connection, state.scale_factor, root_id).ok()?, ) as Rc) }) .collect() } fn primary_display(&self) -> Option> { let state = self.0.borrow(); Some(Rc::new( X11Display::new( &state.xcb_connection, state.scale_factor, state.x_root_index, ) .expect("There should always be a root index"), )) } fn display(&self, id: DisplayId) -> Option> { let state = self.0.borrow(); Some(Rc::new( X11Display::new(&state.xcb_connection, state.scale_factor, id.0 as usize).ok()?, )) } fn open_window( &self, handle: AnyWindowHandle, params: WindowParams, ) -> anyhow::Result> { let mut state = self.0.borrow_mut(); let x_window = state.xcb_connection.generate_id().unwrap(); let window = X11Window::new( handle, X11ClientStatePtr(Rc::downgrade(&self.0)), state.common.foreground_executor.clone(), params, &state.xcb_connection, state.client_side_decorations_supported, state.x_root_index, x_window, &state.atoms, state.scale_factor, state.common.appearance, )?; state .xcb_connection .change_property32( xproto::PropMode::REPLACE, x_window, state.atoms.XdndAware, state.atoms.XA_ATOM, &[5], ) .unwrap(); let screen_resources = state .xcb_connection .randr_get_screen_resources(x_window) .unwrap() .reply() .expect("Could not find available screens"); let mode = screen_resources .crtcs .iter() .find_map(|crtc| { let crtc_info = state .xcb_connection .randr_get_crtc_info(*crtc, x11rb::CURRENT_TIME) .ok()? .reply() .ok()?; screen_resources .modes .iter() .find(|m| m.id == crtc_info.mode) }) .expect("Unable to find screen refresh rate"); let refresh_event_token = state .loop_handle .insert_source(calloop::timer::Timer::immediate(), { let refresh_duration = mode_refresh_rate(mode); move |mut instant, (), client| { let xcb_connection = { let state = client.0.borrow_mut(); let xcb_connection = state.xcb_connection.clone(); if let Some(window) = state.windows.get(&x_window) { let window = window.window.clone(); drop(state); window.refresh(Default::default()); } xcb_connection }; client.process_x11_events(&xcb_connection).log_err(); // Take into account that some frames have been skipped let now = Instant::now(); while instant < now { instant += refresh_duration; } calloop::timer::TimeoutAction::ToInstant(instant) } }) .expect("Failed to initialize refresh timer"); let window_ref = WindowRef { window: window.0.clone(), refresh_event_token, }; state.windows.insert(x_window, window_ref); Ok(Box::new(window)) } fn set_cursor_style(&self, style: CursorStyle) { let mut state = self.0.borrow_mut(); let Some(focused_window) = state.mouse_focused_window else { return; }; let current_style = state .cursor_styles .get(&focused_window) .unwrap_or(&CursorStyle::Arrow); if *current_style == style { return; } let cursor = match state.cursor_cache.get(&style) { Some(cursor) => *cursor, None => { let Some(cursor) = state .cursor_handle .load_cursor(&state.xcb_connection, &style.to_icon_name()) .log_err() else { return; }; state.cursor_cache.insert(style, cursor); cursor } }; state.cursor_styles.insert(focused_window, style); state .xcb_connection .change_window_attributes( focused_window, &ChangeWindowAttributesAux { cursor: Some(cursor), ..Default::default() }, ) .expect("failed to change window cursor") .check() .unwrap(); } fn open_uri(&self, uri: &str) { #[cfg(any(feature = "wayland", feature = "x11"))] open_uri_internal(self.background_executor(), uri, None); } fn reveal_path(&self, path: PathBuf) { #[cfg(any(feature = "x11", feature = "wayland"))] reveal_path_internal(self.background_executor(), path, None); } fn write_to_primary(&self, item: crate::ClipboardItem) { let state = self.0.borrow_mut(); state .clipboard .store( state.clipboard.setter.atoms.primary, state.clipboard.setter.atoms.utf8_string, item.text().unwrap_or_default().as_bytes(), ) .ok(); } fn write_to_clipboard(&self, item: crate::ClipboardItem) { let mut state = self.0.borrow_mut(); state .clipboard .store( state.clipboard.setter.atoms.clipboard, state.clipboard.setter.atoms.utf8_string, item.text().unwrap_or_default().as_bytes(), ) .ok(); state.clipboard_item.replace(item); } fn read_from_primary(&self) -> Option { let state = self.0.borrow_mut(); state .clipboard .load( state.clipboard.getter.atoms.primary, state.clipboard.getter.atoms.utf8_string, state.clipboard.getter.atoms.property, Duration::from_secs(3), ) .map(|text| crate::ClipboardItem::new_string(String::from_utf8(text).unwrap())) .ok() } fn read_from_clipboard(&self) -> Option { let state = self.0.borrow_mut(); // if the last copy was from this app, return our cached item // which has metadata attached. if state .clipboard .setter .connection .get_selection_owner(state.clipboard.setter.atoms.clipboard) .ok() .and_then(|r| r.reply().ok()) .map(|reply| reply.owner == state.clipboard.setter.window) .unwrap_or(false) { return state.clipboard_item.clone(); } state .clipboard .load( state.clipboard.getter.atoms.clipboard, state.clipboard.getter.atoms.utf8_string, state.clipboard.getter.atoms.property, Duration::from_secs(3), ) .map(|text| crate::ClipboardItem::new_string(String::from_utf8(text).unwrap())) .ok() } fn run(&self) { let mut event_loop = self .0 .borrow_mut() .event_loop .take() .expect("App is already running"); event_loop.run(None, &mut self.clone(), |_| {}).log_err(); } fn active_window(&self) -> Option { let state = self.0.borrow(); state.keyboard_focused_window.and_then(|focused_window| { state .windows .get(&focused_window) .map(|window| window.handle()) }) } fn window_stack(&self) -> Option> { let state = self.0.borrow(); let root = state.xcb_connection.setup().roots[state.x_root_index].root; let reply = state .xcb_connection .get_property( false, root, state.atoms._NET_CLIENT_LIST_STACKING, xproto::AtomEnum::WINDOW, 0, u32::MAX, ) .ok()? .reply() .ok()?; let window_ids = reply .value .chunks_exact(4) .map(|chunk| u32::from_ne_bytes(chunk.try_into().unwrap())) .collect::>(); let mut handles = Vec::new(); // We need to reverse, since _NET_CLIENT_LIST_STACKING has // a back-to-front order. // See: https://specifications.freedesktop.org/wm-spec/1.3/ar01s03.html for window_ref in window_ids .iter() .rev() .filter_map(|&win| state.windows.get(&win)) { if !window_ref.window.state.borrow().destroyed { handles.push(window_ref.handle()); } } Some(handles) } } // Adatpted from: // https://docs.rs/winit/0.29.11/src/winit/platform_impl/linux/x11/monitor.rs.html#103-111 pub fn mode_refresh_rate(mode: &randr::ModeInfo) -> Duration { if mode.dot_clock == 0 || mode.htotal == 0 || mode.vtotal == 0 { return Duration::from_millis(16); } let millihertz = mode.dot_clock as u64 * 1_000 / (mode.htotal as u64 * mode.vtotal as u64); let micros = 1_000_000_000 / millihertz; log::info!("Refreshing at {} micros", micros); Duration::from_micros(micros) } fn fp3232_to_f32(value: xinput::Fp3232) -> f32 { value.integral as f32 + value.frac as f32 / u32::MAX as f32 } fn check_compositor_present(xcb_connection: &XCBConnection, root: u32) -> bool { // Method 1: Check for _NET_WM_CM_S{root} let atom_name = format!("_NET_WM_CM_S{}", root); let atom = xcb_connection .intern_atom(false, atom_name.as_bytes()) .unwrap() .reply() .map(|reply| reply.atom) .unwrap_or(0); let method1 = if atom != 0 { xcb_connection .get_selection_owner(atom) .unwrap() .reply() .map(|reply| reply.owner != 0) .unwrap_or(false) } else { false }; // Method 2: Check for _NET_WM_CM_OWNER let atom_name = "_NET_WM_CM_OWNER"; let atom = xcb_connection .intern_atom(false, atom_name.as_bytes()) .unwrap() .reply() .map(|reply| reply.atom) .unwrap_or(0); let method2 = if atom != 0 { xcb_connection .get_property(false, root, atom, xproto::AtomEnum::WINDOW, 0, 1) .unwrap() .reply() .map(|reply| reply.value_len > 0) .unwrap_or(false) } else { false }; // Method 3: Check for _NET_SUPPORTING_WM_CHECK let atom_name = "_NET_SUPPORTING_WM_CHECK"; let atom = xcb_connection .intern_atom(false, atom_name.as_bytes()) .unwrap() .reply() .map(|reply| reply.atom) .unwrap_or(0); let method3 = if atom != 0 { xcb_connection .get_property(false, root, atom, xproto::AtomEnum::WINDOW, 0, 1) .unwrap() .reply() .map(|reply| reply.value_len > 0) .unwrap_or(false) } else { false }; // TODO: Remove this log::info!( "Compositor detection: _NET_WM_CM_S?={}, _NET_WM_CM_OWNER={}, _NET_SUPPORTING_WM_CHECK={}", method1, method2, method3 ); method1 || method2 || method3 } fn check_gtk_frame_extents_supported( xcb_connection: &XCBConnection, atoms: &XcbAtoms, root: xproto::Window, ) -> bool { let supported_atoms = xcb_connection .get_property( false, root, atoms._NET_SUPPORTED, xproto::AtomEnum::ATOM, 0, 1024, ) .unwrap() .reply() .map(|reply| { // Convert Vec to Vec reply .value .chunks_exact(4) .map(|chunk| u32::from_ne_bytes([chunk[0], chunk[1], chunk[2], chunk[3]])) .collect::>() }) .unwrap_or_default(); supported_atoms.contains(&atoms._GTK_FRAME_EXTENTS) } fn xdnd_is_atom_supported(atom: u32, atoms: &XcbAtoms) -> bool { return atom == atoms.TEXT || atom == atoms.STRING || atom == atoms.UTF8_STRING || atom == atoms.TEXT_PLAIN || atom == atoms.TEXT_PLAIN_UTF8 || atom == atoms.TextUriList; } fn xdnd_get_supported_atom( xcb_connection: &XCBConnection, supported_atoms: &XcbAtoms, target: xproto::Window, ) -> u32 { let property = xcb_connection .get_property( false, target, supported_atoms.XdndTypeList, AtomEnum::ANY, 0, 1024, ) .unwrap(); if let Ok(reply) = property.reply() { if let Some(atoms) = reply.value32() { for atom in atoms { if xdnd_is_atom_supported(atom, &supported_atoms) { return atom; } } } } return 0; } fn xdnd_send_finished( xcb_connection: &XCBConnection, atoms: &XcbAtoms, source: xproto::Window, target: xproto::Window, ) { let message = ClientMessageEvent { format: 32, window: target, type_: atoms.XdndFinished, data: ClientMessageData::from([source, 1, atoms.XdndActionCopy, 0, 0]), sequence: 0, response_type: xproto::CLIENT_MESSAGE_EVENT, }; xcb_connection .send_event(false, target, EventMask::default(), message) .unwrap(); } fn xdnd_send_status( xcb_connection: &XCBConnection, atoms: &XcbAtoms, source: xproto::Window, target: xproto::Window, action: u32, ) { let message = ClientMessageEvent { format: 32, window: target, type_: atoms.XdndStatus, data: ClientMessageData::from([source, 1, 0, 0, action]), sequence: 0, response_type: xproto::CLIENT_MESSAGE_EVENT, }; xcb_connection .send_event(false, target, EventMask::default(), message) .unwrap(); } /// Recomputes `pointer_device_states` by querying all pointer devices. /// When a device is present in `scroll_values_to_preserve`, its value for `ScrollAxisState.scroll_value` is used. fn get_new_pointer_device_states( xcb_connection: &XCBConnection, scroll_values_to_preserve: &BTreeMap, ) -> BTreeMap { let devices_query_result = xcb_connection .xinput_xi_query_device(XINPUT_ALL_DEVICES) .unwrap() .reply() .unwrap(); let mut pointer_device_states = BTreeMap::new(); pointer_device_states.extend( devices_query_result .infos .iter() .filter(|info| is_pointer_device(info.type_)) .filter_map(|info| { let scroll_data = info .classes .iter() .filter_map(|class| class.data.as_scroll()) .map(|class| *class) .rev() .collect::>(); let old_state = scroll_values_to_preserve.get(&info.deviceid); let old_horizontal = old_state.map(|state| &state.horizontal); let old_vertical = old_state.map(|state| &state.vertical); let horizontal = scroll_data .iter() .find(|data| data.scroll_type == xinput::ScrollType::HORIZONTAL) .map(|data| scroll_data_to_axis_state(data, old_horizontal)); let vertical = scroll_data .iter() .find(|data| data.scroll_type == xinput::ScrollType::VERTICAL) .map(|data| scroll_data_to_axis_state(data, old_vertical)); if horizontal.is_none() && vertical.is_none() { None } else { Some(( info.deviceid, PointerDeviceState { horizontal: horizontal.unwrap_or_else(Default::default), vertical: vertical.unwrap_or_else(Default::default), }, )) } }), ); if pointer_device_states.is_empty() { log::error!("Found no xinput mouse pointers."); } return pointer_device_states; } /// Returns true if the device is a pointer device. Does not include pointer device groups. fn is_pointer_device(type_: xinput::DeviceType) -> bool { type_ == xinput::DeviceType::SLAVE_POINTER } fn scroll_data_to_axis_state( data: &xinput::DeviceClassDataScroll, old_axis_state_with_valid_scroll_value: Option<&ScrollAxisState>, ) -> ScrollAxisState { ScrollAxisState { valuator_number: Some(data.number), multiplier: SCROLL_LINES / fp3232_to_f32(data.increment), scroll_value: old_axis_state_with_valid_scroll_value.and_then(|state| state.scroll_value), } } fn reset_all_pointer_device_scroll_positions( pointer_device_states: &mut BTreeMap, ) { pointer_device_states .iter_mut() .for_each(|(_, device_state)| reset_pointer_device_scroll_positions(device_state)); } fn reset_pointer_device_scroll_positions(pointer: &mut PointerDeviceState) { pointer.horizontal.scroll_value = None; pointer.vertical.scroll_value = None; } /// Returns the scroll delta for a smooth scrolling motion event, or `None` if no scroll data is present. fn get_scroll_delta_and_update_state( pointer: &mut PointerDeviceState, event: &xinput::MotionEvent, ) -> Option> { let delta_x = get_axis_scroll_delta_and_update_state(event, &mut pointer.horizontal); let delta_y = get_axis_scroll_delta_and_update_state(event, &mut pointer.vertical); if delta_x.is_some() || delta_y.is_some() { Some(Point::new(delta_x.unwrap_or(0.0), delta_y.unwrap_or(0.0))) } else { None } } fn get_axis_scroll_delta_and_update_state( event: &xinput::MotionEvent, axis: &mut ScrollAxisState, ) -> Option { let axis_index = get_valuator_axis_index(&event.valuator_mask, axis.valuator_number?)?; if let Some(axis_value) = event.axisvalues.get(axis_index) { let new_scroll = fp3232_to_f32(*axis_value); let delta_scroll = axis .scroll_value .map(|old_scroll| (old_scroll - new_scroll) * axis.multiplier); axis.scroll_value = Some(new_scroll); delta_scroll } else { log::error!("Encountered invalid XInput valuator_mask, scrolling may not work properly."); None } } fn make_scroll_wheel_event( position: Point, scroll_delta: Point, modifiers: Modifiers, ) -> crate::ScrollWheelEvent { // When shift is held down, vertical scrolling turns into horizontal scrolling. let delta = if modifiers.shift { Point { x: scroll_delta.y, y: 0.0, } } else { scroll_delta }; crate::ScrollWheelEvent { position, delta: ScrollDelta::Lines(delta), modifiers, touch_phase: TouchPhase::default(), } }