Move Wayland backend to winit-wayland (#4252)

winit-wayland/src/seat/keyboard/mod.rs

@@ -0,0 +1,377 @@
+//! The keyboard input handling.
+
+use std::sync::Mutex;
+use std::time::Duration;
+
+use calloop::timer::{TimeoutAction, Timer};
+use calloop::{LoopHandle, RegistrationToken};
+use sctk::reexports::client::protocol::wl_keyboard::{
+    Event as WlKeyboardEvent, KeyState as WlKeyState, KeymapFormat as WlKeymapFormat, WlKeyboard,
+};
+use sctk::reexports::client::protocol::wl_seat::WlSeat;
+use sctk::reexports::client::{Connection, Dispatch, Proxy, QueueHandle, WEnum};
+use tracing::warn;
+use winit_common::xkb::Context;
+use winit_core::event::{ElementState, WindowEvent};
+use winit_core::keyboard::ModifiersState;
+
+use crate::event_loop::sink::EventSink;
+use crate::state::WinitState;
+use crate::WindowId;
+
+impl Dispatch<WlKeyboard, KeyboardData, WinitState> for WinitState {
+    fn event(
+        state: &mut WinitState,
+        wl_keyboard: &WlKeyboard,
+        event: <WlKeyboard as Proxy>::Event,
+        data: &KeyboardData,
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+        let seat_state = match state.seats.get_mut(&data.seat.id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received keyboard event {event:?} without seat");
+                return;
+            },
+        };
+        let keyboard_state = match seat_state.keyboard_state.as_mut() {
+            Some(keyboard_state) => keyboard_state,
+            None => {
+                warn!("Received keyboard event {event:?} without keyboard");
+                return;
+            },
+        };
+
+        match event {
+            WlKeyboardEvent::Keymap { format, fd, size } => match format {
+                WEnum::Value(format) => match format {
+                    WlKeymapFormat::NoKeymap => {
+                        warn!("non-xkb compatible keymap")
+                    },
+                    WlKeymapFormat::XkbV1 => {
+                        let context = &mut keyboard_state.xkb_context;
+                        context.set_keymap_from_fd(fd, size as usize);
+                    },
+                    _ => unreachable!(),
+                },
+                WEnum::Unknown(value) => {
+                    warn!("unknown keymap format 0x{:x}", value)
+                },
+            },
+            WlKeyboardEvent::Enter { surface, .. } => {
+                let window_id = crate::make_wid(&surface);
+
+                // Mark the window as focused.
+                let was_unfocused = match state.windows.get_mut().get(&window_id) {
+                    Some(window) => {
+                        let mut window = window.lock().unwrap();
+                        let was_unfocused = !window.has_focus();
+                        window.add_seat_focus(data.seat.id());
+                        was_unfocused
+                    },
+                    None => return,
+                };
+
+                // Drop the repeat, if there were any.
+                keyboard_state.current_repeat = None;
+                if let Some(token) = keyboard_state.repeat_token.take() {
+                    keyboard_state.loop_handle.remove(token);
+                }
+
+                *data.window_id.lock().unwrap() = Some(window_id);
+
+                // The keyboard focus is considered as general focus.
+                if was_unfocused {
+                    state.events_sink.push_window_event(WindowEvent::Focused(true), window_id);
+                }
+
+                // HACK: this is just for GNOME not fixing their ordering issue of modifiers.
+                if std::mem::take(&mut seat_state.modifiers_pending) {
+                    state.events_sink.push_window_event(
+                        WindowEvent::ModifiersChanged(seat_state.modifiers.into()),
+                        window_id,
+                    );
+                }
+            },
+            WlKeyboardEvent::Leave { surface, .. } => {
+                let window_id = crate::make_wid(&surface);
+
+                // NOTE: we should drop the repeat regardless whethere it was for the present
+                // window of for the window which just went gone.
+                keyboard_state.current_repeat = None;
+                if let Some(token) = keyboard_state.repeat_token.take() {
+                    keyboard_state.loop_handle.remove(token);
+                }
+
+                // NOTE: The check whether the window exists is essential as we might get a
+                // nil surface, regardless of what protocol says.
+                let focused = match state.windows.get_mut().get(&window_id) {
+                    Some(window) => {
+                        let mut window = window.lock().unwrap();
+                        window.remove_seat_focus(&data.seat.id());
+                        window.has_focus()
+                    },
+                    None => return,
+                };
+
+                // We don't need to update it above, because the next `Enter` will overwrite
+                // anyway.
+                *data.window_id.lock().unwrap() = None;
+
+                if !focused {
+                    // Notify that no modifiers are being pressed.
+                    state.events_sink.push_window_event(
+                        WindowEvent::ModifiersChanged(ModifiersState::empty().into()),
+                        window_id,
+                    );
+
+                    state.events_sink.push_window_event(WindowEvent::Focused(false), window_id);
+                }
+            },
+            WlKeyboardEvent::Key { key, state: WEnum::Value(WlKeyState::Pressed), .. } => {
+                let key = key + 8;
+
+                key_input(
+                    keyboard_state,
+                    &mut state.events_sink,
+                    data,
+                    key,
+                    ElementState::Pressed,
+                    false,
+                );
+
+                let delay = match keyboard_state.repeat_info {
+                    RepeatInfo::Repeat { delay, .. } => delay,
+                    RepeatInfo::Disable => return,
+                };
+
+                if !keyboard_state.xkb_context.keymap_mut().unwrap().key_repeats(key) {
+                    return;
+                }
+
+                keyboard_state.current_repeat = Some(key);
+
+                // NOTE terminate ongoing timer and start a new timer.
+
+                if let Some(token) = keyboard_state.repeat_token.take() {
+                    keyboard_state.loop_handle.remove(token);
+                }
+
+                let timer = Timer::from_duration(delay);
+                let wl_keyboard = wl_keyboard.clone();
+                keyboard_state.repeat_token = keyboard_state
+                    .loop_handle
+                    .insert_source(timer, move |_, _, state| {
+                        // Required to handle the wakeups from the repeat sources.
+                        state.dispatched_events = true;
+
+                        let data = wl_keyboard.data::<KeyboardData>().unwrap();
+                        let seat_state = match state.seats.get_mut(&data.seat.id()) {
+                            Some(seat_state) => seat_state,
+                            None => return TimeoutAction::Drop,
+                        };
+
+                        let keyboard_state = match seat_state.keyboard_state.as_mut() {
+                            Some(keyboard_state) => keyboard_state,
+                            None => return TimeoutAction::Drop,
+                        };
+
+                        // NOTE: The removed on event source is batched, but key change to `None`
+                        // is instant.
+                        let repeat_keycode = match keyboard_state.current_repeat {
+                            Some(repeat_keycode) => repeat_keycode,
+                            None => return TimeoutAction::Drop,
+                        };
+
+                        key_input(
+                            keyboard_state,
+                            &mut state.events_sink,
+                            data,
+                            repeat_keycode,
+                            ElementState::Pressed,
+                            true,
+                        );
+
+                        // NOTE: the gap could change dynamically while repeat is going.
+                        match keyboard_state.repeat_info {
+                            RepeatInfo::Repeat { gap, .. } => TimeoutAction::ToDuration(gap),
+                            RepeatInfo::Disable => TimeoutAction::Drop,
+                        }
+                    })
+                    .ok();
+            },
+            WlKeyboardEvent::Key { key, state: WEnum::Value(WlKeyState::Released), .. } => {
+                let key = key + 8;
+
+                key_input(
+                    keyboard_state,
+                    &mut state.events_sink,
+                    data,
+                    key,
+                    ElementState::Released,
+                    false,
+                );
+
+                if keyboard_state.repeat_info != RepeatInfo::Disable
+                    && keyboard_state.xkb_context.keymap_mut().unwrap().key_repeats(key)
+                    && Some(key) == keyboard_state.current_repeat
+                {
+                    keyboard_state.current_repeat = None;
+                    if let Some(token) = keyboard_state.repeat_token.take() {
+                        keyboard_state.loop_handle.remove(token);
+                    }
+                }
+            },
+            WlKeyboardEvent::Modifiers {
+                mods_depressed, mods_latched, mods_locked, group, ..
+            } => {
+                let xkb_context = &mut keyboard_state.xkb_context;
+                let xkb_state = match xkb_context.state_mut() {
+                    Some(state) => state,
+                    None => return,
+                };
+
+                xkb_state.update_modifiers(mods_depressed, mods_latched, mods_locked, 0, 0, group);
+                seat_state.modifiers = xkb_state.modifiers().into();
+
+                // HACK: part of the workaround from `WlKeyboardEvent::Enter`.
+                let window_id = match *data.window_id.lock().unwrap() {
+                    Some(window_id) => window_id,
+                    None => {
+                        seat_state.modifiers_pending = true;
+                        return;
+                    },
+                };
+
+                state.events_sink.push_window_event(
+                    WindowEvent::ModifiersChanged(seat_state.modifiers.into()),
+                    window_id,
+                );
+            },
+            WlKeyboardEvent::RepeatInfo { rate, delay } => {
+                keyboard_state.repeat_info = if rate == 0 {
+                    // Stop the repeat once we get a disable event.
+                    keyboard_state.current_repeat = None;
+                    if let Some(repeat_token) = keyboard_state.repeat_token.take() {
+                        keyboard_state.loop_handle.remove(repeat_token);
+                    }
+                    RepeatInfo::Disable
+                } else {
+                    let gap = Duration::from_micros(1_000_000 / rate as u64);
+                    let delay = Duration::from_millis(delay as u64);
+                    RepeatInfo::Repeat { gap, delay }
+                };
+            },
+            _ => unreachable!(),
+        }
+    }
+}
+
+/// The state of the keyboard on the current seat.
+#[derive(Debug)]
+pub struct KeyboardState {
+    /// The underlying WlKeyboard.
+    pub keyboard: WlKeyboard,
+
+    /// Loop handle to handle key repeat.
+    pub loop_handle: LoopHandle<'static, WinitState>,
+
+    /// The state of the keyboard.
+    pub xkb_context: Context,
+
+    /// The information about the repeat rate obtained from the compositor.
+    pub repeat_info: RepeatInfo,
+
+    /// The token of the current handle inside the calloop's event loop.
+    pub repeat_token: Option<RegistrationToken>,
+
+    /// The current repeat raw key.
+    pub current_repeat: Option<u32>,
+}
+
+impl KeyboardState {
+    pub fn new(keyboard: WlKeyboard, loop_handle: LoopHandle<'static, WinitState>) -> Self {
+        Self {
+            keyboard,
+            loop_handle,
+            xkb_context: Context::new().unwrap(),
+            repeat_info: RepeatInfo::default(),
+            repeat_token: None,
+            current_repeat: None,
+        }
+    }
+}
+
+impl Drop for KeyboardState {
+    fn drop(&mut self) {
+        if self.keyboard.version() >= 3 {
+            self.keyboard.release();
+        }
+
+        if let Some(token) = self.repeat_token.take() {
+            self.loop_handle.remove(token);
+        }
+    }
+}
+
+/// The rate at which a pressed key is repeated.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RepeatInfo {
+    /// Keys will be repeated at the specified rate and delay.
+    Repeat {
+        /// The time between the key repeats.
+        gap: Duration,
+
+        /// Delay (in milliseconds) between a key press and the start of repetition.
+        delay: Duration,
+    },
+
+    /// Keys should not be repeated.
+    Disable,
+}
+
+impl Default for RepeatInfo {
+    /// The default repeat rate is 25 keys per second with the delay of 200ms.
+    ///
+    /// The values are picked based on the default in various compositors and Xorg.
+    fn default() -> Self {
+        Self::Repeat { gap: Duration::from_millis(40), delay: Duration::from_millis(200) }
+    }
+}
+
+/// Keyboard user data.
+#[derive(Debug)]
+pub struct KeyboardData {
+    /// The currently focused window surface. Could be `None` on bugged compositors, like mutter.
+    window_id: Mutex<Option<WindowId>>,
+
+    /// The seat used to create this keyboard.
+    seat: WlSeat,
+}
+
+impl KeyboardData {
+    pub fn new(seat: WlSeat) -> Self {
+        Self { window_id: Default::default(), seat }
+    }
+}
+
+fn key_input(
+    keyboard_state: &mut KeyboardState,
+    event_sink: &mut EventSink,
+    data: &KeyboardData,
+    keycode: u32,
+    state: ElementState,
+    repeat: bool,
+) {
+    let window_id = match *data.window_id.lock().unwrap() {
+        Some(window_id) => window_id,
+        None => return,
+    };
+
+    if let Some(mut key_context) = keyboard_state.xkb_context.key_context() {
+        let event = key_context.process_key_event(keycode, state, repeat);
+        let event = WindowEvent::KeyboardInput { device_id: None, event, is_synthetic: false };
+        event_sink.push_window_event(event, window_id);
+    }
+}

winit-wayland/src/seat/mod.rs

@@ -0,0 +1,235 @@
+//! Seat handling.
+
+use std::sync::Arc;
+
+use ahash::AHashMap;
+use sctk::reexports::client::backend::ObjectId;
+use sctk::reexports::client::protocol::wl_seat::WlSeat;
+use sctk::reexports::client::protocol::wl_touch::WlTouch;
+use sctk::reexports::client::{Connection, Proxy, QueueHandle};
+use sctk::reexports::protocols::wp::relative_pointer::zv1::client::zwp_relative_pointer_v1::ZwpRelativePointerV1;
+use sctk::reexports::protocols::wp::text_input::zv3::client::zwp_text_input_v3::ZwpTextInputV3;
+use sctk::seat::pointer::{ThemeSpec, ThemedPointer};
+use sctk::seat::{Capability as SeatCapability, SeatHandler, SeatState};
+use tracing::warn;
+use winit_core::event::WindowEvent;
+use winit_core::keyboard::ModifiersState;
+
+use crate::state::WinitState;
+
+mod keyboard;
+mod pointer;
+mod text_input;
+mod touch;
+
+use keyboard::{KeyboardData, KeyboardState};
+pub use pointer::relative_pointer::RelativePointerState;
+pub use pointer::{PointerConstraintsState, WinitPointerData, WinitPointerDataExt};
+use text_input::TextInputData;
+pub use text_input::{TextInputState, ZwpTextInputV3Ext};
+use touch::TouchPoint;
+
+#[derive(Debug, Default)]
+pub struct WinitSeatState {
+    /// The pointer bound on the seat.
+    pointer: Option<Arc<ThemedPointer<WinitPointerData>>>,
+
+    /// The touch bound on the seat.
+    touch: Option<WlTouch>,
+
+    /// The mapping from touched points to the surfaces they're present.
+    touch_map: AHashMap<i32, TouchPoint>,
+
+    /// Id of the first touch event.
+    first_touch_id: Option<i32>,
+
+    /// The text input bound on the seat.
+    text_input: Option<Arc<ZwpTextInputV3>>,
+
+    /// The relative pointer bound on the seat.
+    relative_pointer: Option<ZwpRelativePointerV1>,
+
+    /// The keyboard bound on the seat.
+    keyboard_state: Option<KeyboardState>,
+
+    /// The current modifiers state on the seat.
+    modifiers: ModifiersState,
+
+    /// Whether we have pending modifiers.
+    modifiers_pending: bool,
+}
+
+impl WinitSeatState {
+    pub fn new() -> Self {
+        Default::default()
+    }
+}
+
+impl SeatHandler for WinitState {
+    fn seat_state(&mut self) -> &mut SeatState {
+        &mut self.seat_state
+    }
+
+    fn new_capability(
+        &mut self,
+        _: &Connection,
+        queue_handle: &QueueHandle<Self>,
+        seat: WlSeat,
+        capability: SeatCapability,
+    ) {
+        let seat_state = match self.seats.get_mut(&seat.id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received wl_seat::new_capability for unknown seat");
+                return;
+            },
+        };
+
+        match capability {
+            SeatCapability::Touch if seat_state.touch.is_none() => {
+                seat_state.touch = self.seat_state.get_touch(queue_handle, &seat).ok();
+            },
+            SeatCapability::Keyboard if seat_state.keyboard_state.is_none() => {
+                let keyboard = seat.get_keyboard(queue_handle, KeyboardData::new(seat.clone()));
+                seat_state.keyboard_state =
+                    Some(KeyboardState::new(keyboard, self.loop_handle.clone()));
+            },
+            SeatCapability::Pointer if seat_state.pointer.is_none() => {
+                let surface = self.compositor_state.create_surface(queue_handle);
+                let viewport = self
+                    .viewporter_state
+                    .as_ref()
+                    .map(|state| state.get_viewport(&surface, queue_handle));
+                let surface_id = surface.id();
+                let pointer_data = WinitPointerData::new(seat.clone(), viewport);
+                let themed_pointer = self
+                    .seat_state
+                    .get_pointer_with_theme_and_data(
+                        queue_handle,
+                        &seat,
+                        self.shm.wl_shm(),
+                        surface,
+                        ThemeSpec::System,
+                        pointer_data,
+                    )
+                    .expect("failed to create pointer with present capability.");
+
+                seat_state.relative_pointer = self.relative_pointer.as_ref().map(|manager| {
+                    manager.get_relative_pointer(
+                        themed_pointer.pointer(),
+                        queue_handle,
+                        sctk::globals::GlobalData,
+                    )
+                });
+
+                let themed_pointer = Arc::new(themed_pointer);
+
+                // Register cursor surface.
+                self.pointer_surfaces.insert(surface_id, themed_pointer.clone());
+
+                seat_state.pointer = Some(themed_pointer);
+            },
+            _ => (),
+        }
+
+        if let Some(text_input_state) =
+            seat_state.text_input.is_none().then_some(self.text_input_state.as_ref()).flatten()
+        {
+            seat_state.text_input = Some(Arc::new(text_input_state.get_text_input(
+                &seat,
+                queue_handle,
+                TextInputData::default(),
+            )));
+        }
+    }
+
+    fn remove_capability(
+        &mut self,
+        _: &Connection,
+        _queue_handle: &QueueHandle<Self>,
+        seat: WlSeat,
+        capability: SeatCapability,
+    ) {
+        let seat_state = match self.seats.get_mut(&seat.id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received wl_seat::remove_capability for unknown seat");
+                return;
+            },
+        };
+
+        if let Some(text_input) = seat_state.text_input.take() {
+            text_input.destroy();
+        }
+
+        match capability {
+            SeatCapability::Touch => {
+                if let Some(touch) = seat_state.touch.take() {
+                    if touch.version() >= 3 {
+                        touch.release();
+                    }
+                }
+            },
+            SeatCapability::Pointer => {
+                if let Some(relative_pointer) = seat_state.relative_pointer.take() {
+                    relative_pointer.destroy();
+                }
+
+                if let Some(pointer) = seat_state.pointer.take() {
+                    let pointer_data = pointer.pointer().winit_data();
+
+                    // Remove the cursor from the mapping.
+                    let surface_id = pointer.surface().id();
+                    let _ = self.pointer_surfaces.remove(&surface_id);
+
+                    // Remove the inner locks/confines before dropping the pointer.
+                    pointer_data.unlock_pointer();
+                    pointer_data.unconfine_pointer();
+
+                    if pointer.pointer().version() >= 3 {
+                        pointer.pointer().release();
+                    }
+                }
+            },
+            SeatCapability::Keyboard => {
+                seat_state.keyboard_state = None;
+                self.on_keyboard_destroy(&seat.id());
+            },
+            _ => (),
+        }
+    }
+
+    fn new_seat(
+        &mut self,
+        _connection: &Connection,
+        _queue_handle: &QueueHandle<Self>,
+        seat: WlSeat,
+    ) {
+        self.seats.insert(seat.id(), WinitSeatState::new());
+    }
+
+    fn remove_seat(
+        &mut self,
+        _connection: &Connection,
+        _queue_handle: &QueueHandle<Self>,
+        seat: WlSeat,
+    ) {
+        let _ = self.seats.remove(&seat.id());
+        self.on_keyboard_destroy(&seat.id());
+    }
+}
+
+impl WinitState {
+    fn on_keyboard_destroy(&mut self, seat: &ObjectId) {
+        for (window_id, window) in self.windows.get_mut() {
+            let mut window = window.lock().unwrap();
+            let had_focus = window.has_focus();
+            window.remove_seat_focus(seat);
+            if had_focus != window.has_focus() {
+                self.events_sink.push_window_event(WindowEvent::Focused(false), *window_id);
+            }
+        }
+    }
+}
+
+sctk::delegate_seat!(WinitState);

winit-wayland/src/seat/pointer/mod.rs

@@ -0,0 +1,524 @@
+//! The pointer events.
+
+use std::ops::Deref;
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+
+use tracing::warn;
+
+use sctk::reexports::client::delegate_dispatch;
+use sctk::reexports::client::protocol::wl_pointer::WlPointer;
+use sctk::reexports::client::protocol::wl_seat::WlSeat;
+use sctk::reexports::client::protocol::wl_surface::WlSurface;
+use sctk::reexports::client::{Connection, Proxy, QueueHandle, Dispatch};
+use sctk::reexports::protocols::wp::pointer_constraints::zv1::client::zwp_confined_pointer_v1::ZwpConfinedPointerV1;
+use sctk::reexports::protocols::wp::pointer_constraints::zv1::client::zwp_locked_pointer_v1::ZwpLockedPointerV1;
+use sctk::reexports::protocols::wp::cursor_shape::v1::client::wp_cursor_shape_device_v1::WpCursorShapeDeviceV1;
+use sctk::reexports::protocols::wp::cursor_shape::v1::client::wp_cursor_shape_manager_v1::WpCursorShapeManagerV1;
+use sctk::reexports::protocols::wp::pointer_constraints::zv1::client::zwp_pointer_constraints_v1::{Lifetime, ZwpPointerConstraintsV1};
+use sctk::reexports::client::globals::{BindError, GlobalList};
+use sctk::reexports::csd_frame::FrameClick;
+use sctk::reexports::protocols::wp::viewporter::client::wp_viewport::WpViewport;
+
+use sctk::compositor::SurfaceData;
+use sctk::globals::GlobalData;
+use sctk::seat::pointer::{
+    PointerData, PointerDataExt, PointerEvent, PointerEventKind, PointerHandler,
+};
+use sctk::seat::SeatState;
+
+use dpi::{LogicalPosition, PhysicalPosition};
+use winit_core::event::{
+    ElementState, MouseButton, MouseScrollDelta, PointerKind, PointerSource, TouchPhase,
+    WindowEvent,
+};
+
+use crate::state::WinitState;
+use crate::WindowId;
+
+pub mod relative_pointer;
+
+impl PointerHandler for WinitState {
+    fn pointer_frame(
+        &mut self,
+        connection: &Connection,
+        _: &QueueHandle<Self>,
+        pointer: &WlPointer,
+        events: &[PointerEvent],
+    ) {
+        let seat = pointer.winit_data().seat();
+        let seat_state = match self.seats.get(&seat.id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received pointer event without seat");
+                return;
+            },
+        };
+
+        let themed_pointer = match seat_state.pointer.as_ref() {
+            Some(pointer) => pointer,
+            None => {
+                warn!("Received pointer event without pointer");
+                return;
+            },
+        };
+
+        for event in events {
+            let surface = &event.surface;
+
+            // The parent surface.
+            let parent_surface = match event.surface.data::<SurfaceData>() {
+                Some(data) => data.parent_surface().unwrap_or(surface),
+                None => continue,
+            };
+
+            let window_id = crate::make_wid(parent_surface);
+
+            // Ensure that window exists.
+            let mut window = match self.windows.get_mut().get_mut(&window_id) {
+                Some(window) => window.lock().unwrap(),
+                None => continue,
+            };
+
+            let scale_factor = window.scale_factor();
+            let position: PhysicalPosition<f64> =
+                LogicalPosition::new(event.position.0, event.position.1).to_physical(scale_factor);
+
+            match event.kind {
+                // Pointer movements on decorations.
+                PointerEventKind::Enter { .. } | PointerEventKind::Motion { .. }
+                    if parent_surface != surface =>
+                {
+                    if let Some(icon) = window.frame_point_moved(
+                        seat,
+                        surface,
+                        Duration::ZERO,
+                        event.position.0,
+                        event.position.1,
+                    ) {
+                        let _ = themed_pointer.set_cursor(connection, icon);
+                    }
+                },
+                PointerEventKind::Leave { .. } if parent_surface != surface => {
+                    window.frame_point_left();
+                },
+                ref kind @ PointerEventKind::Press { button, serial, time }
+                | ref kind @ PointerEventKind::Release { button, serial, time }
+                    if parent_surface != surface =>
+                {
+                    let click = match wayland_button_to_winit(button) {
+                        MouseButton::Left => FrameClick::Normal,
+                        MouseButton::Right => FrameClick::Alternate,
+                        _ => continue,
+                    };
+                    let pressed = matches!(kind, PointerEventKind::Press { .. });
+
+                    // Emulate click on the frame.
+                    window.frame_click(
+                        click,
+                        pressed,
+                        seat,
+                        serial,
+                        Duration::from_millis(time as u64),
+                        window_id,
+                        &mut self.window_compositor_updates,
+                    );
+                },
+                // Regular events on the main surface.
+                PointerEventKind::Enter { .. } => {
+                    self.events_sink.push_window_event(
+                        WindowEvent::PointerEntered {
+                            primary: true,
+                            device_id: None,
+                            position,
+                            kind: PointerKind::Mouse,
+                        },
+                        window_id,
+                    );
+
+                    window.pointer_entered(Arc::downgrade(themed_pointer));
+
+                    // Set the currently focused surface.
+                    pointer.winit_data().inner.lock().unwrap().surface = Some(window_id);
+                },
+                PointerEventKind::Leave { .. } => {
+                    window.pointer_left(Arc::downgrade(themed_pointer));
+
+                    // Remove the active surface.
+                    pointer.winit_data().inner.lock().unwrap().surface = None;
+
+                    self.events_sink.push_window_event(
+                        WindowEvent::PointerLeft {
+                            primary: true,
+                            device_id: None,
+                            position: Some(position),
+                            kind: PointerKind::Mouse,
+                        },
+                        window_id,
+                    );
+                },
+                PointerEventKind::Motion { .. } => {
+                    self.events_sink.push_window_event(
+                        WindowEvent::PointerMoved {
+                            primary: true,
+                            device_id: None,
+                            position,
+                            source: PointerSource::Mouse,
+                        },
+                        window_id,
+                    );
+                },
+                ref kind @ PointerEventKind::Press { button, serial, .. }
+                | ref kind @ PointerEventKind::Release { button, serial, .. } => {
+                    // Update the last button serial.
+                    pointer.winit_data().inner.lock().unwrap().latest_button_serial = serial;
+
+                    let button = wayland_button_to_winit(button);
+                    let state = if matches!(kind, PointerEventKind::Press { .. }) {
+                        ElementState::Pressed
+                    } else {
+                        ElementState::Released
+                    };
+                    self.events_sink.push_window_event(
+                        WindowEvent::PointerButton {
+                            primary: true,
+                            device_id: None,
+                            state,
+                            position,
+                            button: button.into(),
+                        },
+                        window_id,
+                    );
+                },
+                PointerEventKind::Axis { horizontal, vertical, .. } => {
+                    // Get the current phase.
+                    let mut pointer_data = pointer.winit_data().inner.lock().unwrap();
+
+                    let has_discrete_scroll = horizontal.discrete != 0 || vertical.discrete != 0;
+
+                    // Figure out what to do about start/ended phases here.
+                    //
+                    // Figure out how to deal with `Started`. Also the `Ended` is not guaranteed
+                    // to be sent for mouse wheels.
+                    let phase = if horizontal.stop || vertical.stop {
+                        TouchPhase::Ended
+                    } else {
+                        match pointer_data.phase {
+                            // Discrete scroll only results in moved events.
+                            _ if has_discrete_scroll => TouchPhase::Moved,
+                            TouchPhase::Started | TouchPhase::Moved => TouchPhase::Moved,
+                            _ => TouchPhase::Started,
+                        }
+                    };
+
+                    // Update the phase.
+                    pointer_data.phase = phase;
+
+                    // Mice events have both pixel and discrete delta's at the same time. So prefer
+                    // the discrete values if they are present.
+                    let delta = if has_discrete_scroll {
+                        // NOTE: Wayland sign convention is the inverse of winit.
+                        MouseScrollDelta::LineDelta(
+                            (-horizontal.discrete) as f32,
+                            (-vertical.discrete) as f32,
+                        )
+                    } else {
+                        // NOTE: Wayland sign convention is the inverse of winit.
+                        MouseScrollDelta::PixelDelta(
+                            LogicalPosition::new(-horizontal.absolute, -vertical.absolute)
+                                .to_physical(scale_factor),
+                        )
+                    };
+
+                    self.events_sink.push_window_event(
+                        WindowEvent::MouseWheel { device_id: None, delta, phase },
+                        window_id,
+                    )
+                },
+            }
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct WinitPointerData {
+    /// The inner winit data associated with the pointer.
+    inner: Mutex<WinitPointerDataInner>,
+
+    /// The data required by the sctk.
+    sctk_data: PointerData,
+
+    /// Viewport for fractional cursor.
+    viewport: Option<WpViewport>,
+}
+
+impl WinitPointerData {
+    pub fn new(seat: WlSeat, viewport: Option<WpViewport>) -> Self {
+        Self {
+            inner: Mutex::new(WinitPointerDataInner::default()),
+            sctk_data: PointerData::new(seat),
+            viewport,
+        }
+    }
+
+    pub fn lock_pointer(
+        &self,
+        pointer_constraints: &PointerConstraintsState,
+        surface: &WlSurface,
+        pointer: &WlPointer,
+        queue_handle: &QueueHandle<WinitState>,
+    ) {
+        let mut inner = self.inner.lock().unwrap();
+        if inner.locked_pointer.is_none() {
+            inner.locked_pointer = Some(pointer_constraints.lock_pointer(
+                surface,
+                pointer,
+                None,
+                Lifetime::Persistent,
+                queue_handle,
+                GlobalData,
+            ));
+        }
+    }
+
+    pub fn unlock_pointer(&self) {
+        let mut inner = self.inner.lock().unwrap();
+        if let Some(locked_pointer) = inner.locked_pointer.take() {
+            locked_pointer.destroy();
+        }
+    }
+
+    pub fn confine_pointer(
+        &self,
+        pointer_constraints: &PointerConstraintsState,
+        surface: &WlSurface,
+        pointer: &WlPointer,
+        queue_handle: &QueueHandle<WinitState>,
+    ) {
+        self.inner.lock().unwrap().confined_pointer = Some(pointer_constraints.confine_pointer(
+            surface,
+            pointer,
+            None,
+            Lifetime::Persistent,
+            queue_handle,
+            GlobalData,
+        ));
+    }
+
+    pub fn unconfine_pointer(&self) {
+        let inner = self.inner.lock().unwrap();
+        if let Some(confined_pointer) = inner.confined_pointer.as_ref() {
+            confined_pointer.destroy();
+        }
+    }
+
+    /// Seat associated with this pointer.
+    pub fn seat(&self) -> &WlSeat {
+        self.sctk_data.seat()
+    }
+
+    /// Active window.
+    pub fn focused_window(&self) -> Option<WindowId> {
+        self.inner.lock().unwrap().surface
+    }
+
+    /// Last button serial.
+    pub fn latest_button_serial(&self) -> u32 {
+        self.sctk_data.latest_button_serial().unwrap_or_default()
+    }
+
+    /// Last enter serial.
+    pub fn latest_enter_serial(&self) -> u32 {
+        self.sctk_data.latest_enter_serial().unwrap_or_default()
+    }
+
+    pub fn set_locked_cursor_position(&self, surface_x: f64, surface_y: f64) {
+        let inner = self.inner.lock().unwrap();
+        if let Some(locked_pointer) = inner.locked_pointer.as_ref() {
+            locked_pointer.set_cursor_position_hint(surface_x, surface_y);
+        }
+    }
+
+    pub fn viewport(&self) -> Option<&WpViewport> {
+        self.viewport.as_ref()
+    }
+}
+
+impl Drop for WinitPointerData {
+    fn drop(&mut self) {
+        if let Some(viewport) = self.viewport.take() {
+            viewport.destroy();
+        }
+    }
+}
+
+impl PointerDataExt for WinitPointerData {
+    fn pointer_data(&self) -> &PointerData {
+        &self.sctk_data
+    }
+}
+
+#[derive(Debug)]
+pub struct WinitPointerDataInner {
+    /// The associated locked pointer.
+    locked_pointer: Option<ZwpLockedPointerV1>,
+
+    /// The associated confined pointer.
+    confined_pointer: Option<ZwpConfinedPointerV1>,
+
+    /// Serial of the last button event.
+    latest_button_serial: u32,
+
+    /// Currently focused window.
+    surface: Option<WindowId>,
+
+    /// Current axis phase.
+    phase: TouchPhase,
+}
+
+impl Drop for WinitPointerDataInner {
+    fn drop(&mut self) {
+        if let Some(locked_pointer) = self.locked_pointer.take() {
+            locked_pointer.destroy();
+        }
+
+        if let Some(confined_pointer) = self.confined_pointer.take() {
+            confined_pointer.destroy();
+        }
+    }
+}
+
+impl Default for WinitPointerDataInner {
+    fn default() -> Self {
+        Self {
+            surface: None,
+            locked_pointer: None,
+            confined_pointer: None,
+            latest_button_serial: 0,
+            phase: TouchPhase::Ended,
+        }
+    }
+}
+
+/// Convert the Wayland button into winit.
+fn wayland_button_to_winit(button: u32) -> MouseButton {
+    // These values are coming from <linux/input-event-codes.h>.
+    const BTN_LEFT: u32 = 0x110;
+    const BTN_RIGHT: u32 = 0x111;
+    const BTN_MIDDLE: u32 = 0x112;
+    const BTN_SIDE: u32 = 0x113;
+    const BTN_EXTRA: u32 = 0x114;
+    const BTN_FORWARD: u32 = 0x115;
+    const BTN_BACK: u32 = 0x116;
+
+    match button {
+        BTN_LEFT => MouseButton::Left,
+        BTN_RIGHT => MouseButton::Right,
+        BTN_MIDDLE => MouseButton::Middle,
+        BTN_BACK | BTN_SIDE => MouseButton::Back,
+        BTN_FORWARD | BTN_EXTRA => MouseButton::Forward,
+        button => MouseButton::Other(button as u16),
+    }
+}
+
+pub trait WinitPointerDataExt {
+    fn winit_data(&self) -> &WinitPointerData;
+}
+
+impl WinitPointerDataExt for WlPointer {
+    fn winit_data(&self) -> &WinitPointerData {
+        self.data::<WinitPointerData>().expect("failed to get pointer data.")
+    }
+}
+
+#[derive(Debug)]
+pub struct PointerConstraintsState {
+    pointer_constraints: ZwpPointerConstraintsV1,
+}
+
+impl PointerConstraintsState {
+    pub fn new(
+        globals: &GlobalList,
+        queue_handle: &QueueHandle<WinitState>,
+    ) -> Result<Self, BindError> {
+        let pointer_constraints = globals.bind(queue_handle, 1..=1, GlobalData)?;
+        Ok(Self { pointer_constraints })
+    }
+}
+
+impl Deref for PointerConstraintsState {
+    type Target = ZwpPointerConstraintsV1;
+
+    fn deref(&self) -> &Self::Target {
+        &self.pointer_constraints
+    }
+}
+
+impl Dispatch<ZwpPointerConstraintsV1, GlobalData, WinitState> for PointerConstraintsState {
+    fn event(
+        _state: &mut WinitState,
+        _proxy: &ZwpPointerConstraintsV1,
+        _event: <ZwpPointerConstraintsV1 as wayland_client::Proxy>::Event,
+        _data: &GlobalData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<ZwpLockedPointerV1, GlobalData, WinitState> for PointerConstraintsState {
+    fn event(
+        _state: &mut WinitState,
+        _proxy: &ZwpLockedPointerV1,
+        _event: <ZwpLockedPointerV1 as wayland_client::Proxy>::Event,
+        _data: &GlobalData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<ZwpConfinedPointerV1, GlobalData, WinitState> for PointerConstraintsState {
+    fn event(
+        _state: &mut WinitState,
+        _proxy: &ZwpConfinedPointerV1,
+        _event: <ZwpConfinedPointerV1 as wayland_client::Proxy>::Event,
+        _data: &GlobalData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<WpCursorShapeDeviceV1, GlobalData, WinitState> for SeatState {
+    fn event(
+        _: &mut WinitState,
+        _: &WpCursorShapeDeviceV1,
+        _: <WpCursorShapeDeviceV1 as Proxy>::Event,
+        _: &GlobalData,
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+        unreachable!("wp_cursor_shape_manager has no events")
+    }
+}
+
+impl Dispatch<WpCursorShapeManagerV1, GlobalData, WinitState> for SeatState {
+    fn event(
+        _: &mut WinitState,
+        _: &WpCursorShapeManagerV1,
+        _: <WpCursorShapeManagerV1 as Proxy>::Event,
+        _: &GlobalData,
+        _: &Connection,
+        _: &QueueHandle<WinitState>,
+    ) {
+        unreachable!("wp_cursor_device_manager has no events")
+    }
+}
+
+delegate_dispatch!(WinitState: [ WlPointer: WinitPointerData] => SeatState);
+delegate_dispatch!(WinitState: [ WpCursorShapeManagerV1: GlobalData] => SeatState);
+delegate_dispatch!(WinitState: [ WpCursorShapeDeviceV1: GlobalData] => SeatState);
+delegate_dispatch!(WinitState: [ZwpPointerConstraintsV1: GlobalData] => PointerConstraintsState);
+delegate_dispatch!(WinitState: [ZwpLockedPointerV1: GlobalData] => PointerConstraintsState);
+delegate_dispatch!(WinitState: [ZwpConfinedPointerV1: GlobalData] => PointerConstraintsState);

winit-wayland/src/seat/pointer/relative_pointer.rs

@@ -0,0 +1,77 @@
+//! Relative pointer.
+
+use std::ops::Deref;
+
+use sctk::reexports::client::globals::{BindError, GlobalList};
+use sctk::reexports::client::{delegate_dispatch, Dispatch};
+use sctk::reexports::client::{Connection, QueueHandle};
+use sctk::reexports::protocols::wp::relative_pointer::zv1::{
+    client::zwp_relative_pointer_manager_v1::ZwpRelativePointerManagerV1,
+    client::zwp_relative_pointer_v1::{self, ZwpRelativePointerV1},
+};
+
+use sctk::globals::GlobalData;
+
+use winit_core::event::DeviceEvent;
+use crate::state::WinitState;
+
+/// Wrapper around the relative pointer.
+#[derive(Debug)]
+pub struct RelativePointerState {
+    manager: ZwpRelativePointerManagerV1,
+}
+
+impl RelativePointerState {
+    /// Create new relative pointer manager.
+    pub fn new(
+        globals: &GlobalList,
+        queue_handle: &QueueHandle<WinitState>,
+    ) -> Result<Self, BindError> {
+        let manager = globals.bind(queue_handle, 1..=1, GlobalData)?;
+        Ok(Self { manager })
+    }
+}
+
+impl Deref for RelativePointerState {
+    type Target = ZwpRelativePointerManagerV1;
+
+    fn deref(&self) -> &Self::Target {
+        &self.manager
+    }
+}
+
+impl Dispatch<ZwpRelativePointerManagerV1, GlobalData, WinitState> for RelativePointerState {
+    fn event(
+        _state: &mut WinitState,
+        _proxy: &ZwpRelativePointerManagerV1,
+        _event: <ZwpRelativePointerManagerV1 as wayland_client::Proxy>::Event,
+        _data: &GlobalData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<ZwpRelativePointerV1, GlobalData, WinitState> for RelativePointerState {
+    fn event(
+        state: &mut WinitState,
+        _proxy: &ZwpRelativePointerV1,
+        event: <ZwpRelativePointerV1 as wayland_client::Proxy>::Event,
+        _data: &GlobalData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+        let (dx_unaccel, dy_unaccel) = match event {
+            zwp_relative_pointer_v1::Event::RelativeMotion { dx_unaccel, dy_unaccel, .. } => {
+                (dx_unaccel, dy_unaccel)
+            },
+            _ => return,
+        };
+        state
+            .events_sink
+            .push_device_event(DeviceEvent::PointerMotion { delta: (dx_unaccel, dy_unaccel) });
+    }
+}
+
+delegate_dispatch!(WinitState: [ZwpRelativePointerV1: GlobalData] => RelativePointerState);
+delegate_dispatch!(WinitState: [ZwpRelativePointerManagerV1: GlobalData] => RelativePointerState);

winit-wayland/src/seat/text_input/mod.rs

@@ -0,0 +1,199 @@
+use std::ops::Deref;
+
+use sctk::globals::GlobalData;
+use sctk::reexports::client::globals::{BindError, GlobalList};
+use sctk::reexports::client::protocol::wl_surface::WlSurface;
+use sctk::reexports::client::{delegate_dispatch, Connection, Dispatch, Proxy, QueueHandle};
+use sctk::reexports::protocols::wp::text_input::zv3::client::zwp_text_input_manager_v3::ZwpTextInputManagerV3;
+use sctk::reexports::protocols::wp::text_input::zv3::client::zwp_text_input_v3::{
+    ContentHint, ContentPurpose, Event as TextInputEvent, ZwpTextInputV3,
+};
+use winit_core::event::{Ime, WindowEvent};
+use winit_core::window::ImePurpose;
+
+use crate::state::WinitState;
+
+#[derive(Debug)]
+pub struct TextInputState {
+    text_input_manager: ZwpTextInputManagerV3,
+}
+
+impl TextInputState {
+    pub fn new(
+        globals: &GlobalList,
+        queue_handle: &QueueHandle<WinitState>,
+    ) -> Result<Self, BindError> {
+        let text_input_manager = globals.bind(queue_handle, 1..=1, GlobalData)?;
+        Ok(Self { text_input_manager })
+    }
+}
+
+impl Deref for TextInputState {
+    type Target = ZwpTextInputManagerV3;
+
+    fn deref(&self) -> &Self::Target {
+        &self.text_input_manager
+    }
+}
+
+impl Dispatch<ZwpTextInputManagerV3, GlobalData, WinitState> for TextInputState {
+    fn event(
+        _state: &mut WinitState,
+        _proxy: &ZwpTextInputManagerV3,
+        _event: <ZwpTextInputManagerV3 as Proxy>::Event,
+        _data: &GlobalData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+    }
+}
+
+impl Dispatch<ZwpTextInputV3, TextInputData, WinitState> for TextInputState {
+    fn event(
+        state: &mut WinitState,
+        text_input: &ZwpTextInputV3,
+        event: <ZwpTextInputV3 as Proxy>::Event,
+        data: &TextInputData,
+        _conn: &Connection,
+        _qhandle: &QueueHandle<WinitState>,
+    ) {
+        let windows = state.windows.get_mut();
+        let mut text_input_data = data.inner.lock().unwrap();
+        match event {
+            TextInputEvent::Enter { surface } => {
+                let window_id = crate::make_wid(&surface);
+                text_input_data.surface = Some(surface);
+
+                let mut window = match windows.get(&window_id) {
+                    Some(window) => window.lock().unwrap(),
+                    None => return,
+                };
+
+                if window.ime_allowed() {
+                    text_input.enable();
+                    text_input.set_content_type_by_purpose(window.ime_purpose());
+                    text_input.commit();
+                    state.events_sink.push_window_event(WindowEvent::Ime(Ime::Enabled), window_id);
+                }
+
+                window.text_input_entered(text_input);
+            },
+            TextInputEvent::Leave { surface } => {
+                text_input_data.surface = None;
+
+                // Always issue a disable.
+                text_input.disable();
+                text_input.commit();
+
+                let window_id = crate::make_wid(&surface);
+
+                // XXX this check is essential, because `leave` could have a
+                // reference to nil surface...
+                let mut window = match windows.get(&window_id) {
+                    Some(window) => window.lock().unwrap(),
+                    None => return,
+                };
+
+                window.text_input_left(text_input);
+
+                state.events_sink.push_window_event(WindowEvent::Ime(Ime::Disabled), window_id);
+            },
+            TextInputEvent::PreeditString { text, cursor_begin, cursor_end } => {
+                let text = text.unwrap_or_default();
+                let cursor_begin = usize::try_from(cursor_begin)
+                    .ok()
+                    .and_then(|idx| text.is_char_boundary(idx).then_some(idx));
+                let cursor_end = usize::try_from(cursor_end)
+                    .ok()
+                    .and_then(|idx| text.is_char_boundary(idx).then_some(idx));
+
+                text_input_data.pending_preedit = Some(Preedit { text, cursor_begin, cursor_end })
+            },
+            TextInputEvent::CommitString { text } => {
+                text_input_data.pending_preedit = None;
+                text_input_data.pending_commit = text;
+            },
+            TextInputEvent::Done { .. } => {
+                let window_id = match text_input_data.surface.as_ref() {
+                    Some(surface) => crate::make_wid(surface),
+                    None => return,
+                };
+
+                // Clear preedit, unless all we'll be doing next is sending a new preedit.
+                if text_input_data.pending_commit.is_some()
+                    || text_input_data.pending_preedit.is_none()
+                {
+                    state.events_sink.push_window_event(
+                        WindowEvent::Ime(Ime::Preedit(String::new(), None)),
+                        window_id,
+                    );
+                }
+
+                // Send `Commit`.
+                if let Some(text) = text_input_data.pending_commit.take() {
+                    state
+                        .events_sink
+                        .push_window_event(WindowEvent::Ime(Ime::Commit(text)), window_id);
+                }
+
+                // Send preedit.
+                if let Some(preedit) = text_input_data.pending_preedit.take() {
+                    let cursor_range =
+                        preedit.cursor_begin.map(|b| (b, preedit.cursor_end.unwrap_or(b)));
+
+                    state.events_sink.push_window_event(
+                        WindowEvent::Ime(Ime::Preedit(preedit.text, cursor_range)),
+                        window_id,
+                    );
+                }
+            },
+            TextInputEvent::DeleteSurroundingText { .. } => {
+                // Not handled.
+            },
+            _ => {},
+        }
+    }
+}
+
+pub trait ZwpTextInputV3Ext {
+    fn set_content_type_by_purpose(&self, purpose: ImePurpose);
+}
+
+impl ZwpTextInputV3Ext for ZwpTextInputV3 {
+    fn set_content_type_by_purpose(&self, purpose: ImePurpose) {
+        let (hint, purpose) = match purpose {
+            ImePurpose::Password => (ContentHint::SensitiveData, ContentPurpose::Password),
+            ImePurpose::Terminal => (ContentHint::None, ContentPurpose::Terminal),
+            _ => (ContentHint::None, ContentPurpose::Normal),
+        };
+        self.set_content_type(hint, purpose);
+    }
+}
+
+/// The Data associated with the text input.
+#[derive(Default)]
+pub struct TextInputData {
+    inner: std::sync::Mutex<TextInputDataInner>,
+}
+
+#[derive(Default)]
+pub struct TextInputDataInner {
+    /// The `WlSurface` we're performing input to.
+    surface: Option<WlSurface>,
+
+    /// The commit to submit on `done`.
+    pending_commit: Option<String>,
+
+    /// The preedit to submit on `done`.
+    pending_preedit: Option<Preedit>,
+}
+
+/// The state of the preedit.
+struct Preedit {
+    text: String,
+    cursor_begin: Option<usize>,
+    cursor_end: Option<usize>,
+}
+
+delegate_dispatch!(WinitState: [ZwpTextInputManagerV3: GlobalData] => TextInputState);
+delegate_dispatch!(WinitState: [ZwpTextInputV3: TextInputData] => TextInputState);

winit-wayland/src/seat/touch/mod.rs

@@ -0,0 +1,254 @@
+//! Touch handling.
+
+use dpi::LogicalPosition;
+use sctk::reexports::client::protocol::wl_seat::WlSeat;
+use sctk::reexports::client::protocol::wl_surface::WlSurface;
+use sctk::reexports::client::protocol::wl_touch::WlTouch;
+use sctk::reexports::client::{Connection, Proxy, QueueHandle};
+use sctk::seat::touch::{TouchData, TouchHandler};
+use tracing::warn;
+use winit_core::event::{
+    ButtonSource, ElementState, FingerId, PointerKind, PointerSource, WindowEvent,
+};
+
+use crate::state::WinitState;
+
+impl TouchHandler for WinitState {
+    fn down(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        touch: &WlTouch,
+        _: u32,
+        _: u32,
+        surface: WlSurface,
+        id: i32,
+        position: (f64, f64),
+    ) {
+        let window_id = crate::make_wid(&surface);
+        let scale_factor = match self.windows.get_mut().get(&window_id) {
+            Some(window) => window.lock().unwrap().scale_factor(),
+            None => return,
+        };
+
+        let seat_state = match self.seats.get_mut(&touch.seat().id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received wl_touch::down without seat");
+                return;
+            },
+        };
+
+        // Update the state of the point.
+        let location = LogicalPosition::<f64>::from(position);
+        // Only update primary finger once we don't have any touch.
+        if seat_state.touch_map.is_empty() {
+            seat_state.first_touch_id = Some(id);
+        }
+        let primary = seat_state.first_touch_id == Some(id);
+        seat_state.touch_map.insert(id, TouchPoint { surface, location });
+
+        let position = location.to_physical(scale_factor);
+        let finger_id = FingerId::from_raw(id as usize);
+
+        self.events_sink.push_window_event(
+            WindowEvent::PointerEntered {
+                device_id: None,
+                primary,
+                position,
+                kind: PointerKind::Touch(finger_id),
+            },
+            window_id,
+        );
+        self.events_sink.push_window_event(
+            WindowEvent::PointerButton {
+                device_id: None,
+                primary,
+                state: ElementState::Pressed,
+                position,
+                button: ButtonSource::Touch { finger_id, force: None },
+            },
+            window_id,
+        );
+    }
+
+    fn up(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        touch: &WlTouch,
+        _: u32,
+        _: u32,
+        id: i32,
+    ) {
+        let seat_state = match self.seats.get_mut(&touch.seat().id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received wl_touch::up without seat");
+                return;
+            },
+        };
+
+        // Remove the touch point.
+        let touch_point = match seat_state.touch_map.remove(&id) {
+            Some(touch_point) => touch_point,
+            None => return,
+        };
+
+        // Update the primary touch point.
+        let primary = seat_state.first_touch_id == Some(id);
+        // Reset primary finger once all the other fingers are lifted to not transfer primary
+        // finger to some other finger and still accept it when it's briefly moved between the
+        // windows.
+        if seat_state.touch_map.is_empty() {
+            seat_state.first_touch_id = None;
+        }
+
+        let window_id = crate::make_wid(&touch_point.surface);
+        let scale_factor = match self.windows.get_mut().get(&window_id) {
+            Some(window) => window.lock().unwrap().scale_factor(),
+            None => return,
+        };
+
+        let position = touch_point.location.to_physical(scale_factor);
+        let finger_id = FingerId::from_raw(id as usize);
+
+        self.events_sink.push_window_event(
+            WindowEvent::PointerButton {
+                device_id: None,
+                primary,
+                state: ElementState::Released,
+                position,
+                button: ButtonSource::Touch { finger_id, force: None },
+            },
+            window_id,
+        );
+        self.events_sink.push_window_event(
+            WindowEvent::PointerLeft {
+                device_id: None,
+                primary,
+                position: Some(position),
+                kind: PointerKind::Touch(finger_id),
+            },
+            window_id,
+        );
+    }
+
+    fn motion(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        touch: &WlTouch,
+        _: u32,
+        id: i32,
+        position: (f64, f64),
+    ) {
+        let seat_state = match self.seats.get_mut(&touch.seat().id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received wl_touch::motion without seat");
+                return;
+            },
+        };
+
+        // Remove the touch point.
+        let touch_point = match seat_state.touch_map.get_mut(&id) {
+            Some(touch_point) => touch_point,
+            None => return,
+        };
+
+        let primary = seat_state.first_touch_id == Some(id);
+
+        let window_id = crate::make_wid(&touch_point.surface);
+        let scale_factor = match self.windows.get_mut().get(&window_id) {
+            Some(window) => window.lock().unwrap().scale_factor(),
+            None => return,
+        };
+
+        touch_point.location = LogicalPosition::<f64>::from(position);
+
+        self.events_sink.push_window_event(
+            WindowEvent::PointerMoved {
+                device_id: None,
+                primary,
+                position: touch_point.location.to_physical(scale_factor),
+                source: PointerSource::Touch {
+                    finger_id: FingerId::from_raw(id as usize),
+                    force: None,
+                },
+            },
+            window_id,
+        );
+    }
+
+    fn cancel(&mut self, _: &Connection, _: &QueueHandle<Self>, touch: &WlTouch) {
+        let seat_state = match self.seats.get_mut(&touch.seat().id()) {
+            Some(seat_state) => seat_state,
+            None => {
+                warn!("Received wl_touch::cancel without seat");
+                return;
+            },
+        };
+
+        for (id, touch_point) in seat_state.touch_map.drain() {
+            let window_id = crate::make_wid(&touch_point.surface);
+            let scale_factor = match self.windows.get_mut().get(&window_id) {
+                Some(window) => window.lock().unwrap().scale_factor(),
+                None => return,
+            };
+
+            let primary = seat_state.first_touch_id == Some(id);
+            let position = touch_point.location.to_physical(scale_factor);
+
+            self.events_sink.push_window_event(
+                WindowEvent::PointerLeft {
+                    device_id: None,
+                    primary,
+                    position: Some(position),
+                    kind: PointerKind::Touch(FingerId::from_raw(id as usize)),
+                },
+                window_id,
+            );
+        }
+
+        seat_state.first_touch_id = None;
+    }
+
+    fn shape(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &WlTouch,
+        _: i32,
+        _: f64,
+        _: f64,
+    ) {
+        // Blank.
+    }
+
+    fn orientation(&mut self, _: &Connection, _: &QueueHandle<Self>, _: &WlTouch, _: i32, _: f64) {
+        // Blank.
+    }
+}
+
+/// The state of the touch point.
+#[derive(Debug)]
+pub struct TouchPoint {
+    /// The surface on which the point is present.
+    pub surface: WlSurface,
+
+    /// The location of the point on the surface.
+    pub location: LogicalPosition<f64>,
+}
+
+pub trait TouchDataExt {
+    fn seat(&self) -> &WlSeat;
+}
+
+impl TouchDataExt for WlTouch {
+    fn seat(&self) -> &WlSeat {
+        self.data::<TouchData>().expect("failed to get touch data.").seat()
+    }
+}
+
+sctk::delegate_touch!(WinitState);