protocols: add IME protocols

This commit adds support for the `input_method_v2`, `text_input_v3`,
and `virtual_keyboard`. The implementation follows the one in the
anvil and catacomb, but those protocols are mostly enabled and
forget type of things.

Fixes #22.

src/handlers/mod.rs

@@ -4,22 +4,26 @@ mod xdg_shell;
 
 use smithay::backend::allocator::dmabuf::Dmabuf;
 use smithay::backend::renderer::ImportDma;
+use smithay::desktop::PopupKind;
 use smithay::input::pointer::CursorImageStatus;
 use smithay::input::{Seat, SeatHandler, SeatState};
 use smithay::reexports::wayland_server::protocol::wl_data_source::WlDataSource;
 use smithay::reexports::wayland_server::protocol::wl_surface::WlSurface;
 use smithay::reexports::wayland_server::Resource;
+use smithay::utils::{Logical, Rectangle};
 use smithay::wayland::data_device::{
     set_data_device_focus, ClientDndGrabHandler, DataDeviceHandler, DataDeviceState,
     ServerDndGrabHandler,
 };
 use smithay::wayland::dmabuf::{DmabufGlobal, DmabufHandler, DmabufState, ImportError};
+use smithay::wayland::input_method::{InputMethodHandler, PopupSurface};
 use smithay::wayland::primary_selection::{
     set_primary_focus, PrimarySelectionHandler, PrimarySelectionState,
 };
 use smithay::{
-    delegate_data_device, delegate_dmabuf, delegate_output, delegate_pointer_gestures,
-    delegate_presentation, delegate_primary_selection, delegate_seat, delegate_tablet_manager,
+    delegate_data_device, delegate_dmabuf, delegate_input_method_manager, delegate_output,
+    delegate_pointer_gestures, delegate_presentation, delegate_primary_selection, delegate_seat,
+    delegate_tablet_manager, delegate_text_input_manager, delegate_virtual_keyboard_manager,
 };
 
 use crate::niri::State;
@@ -48,6 +52,25 @@ impl SeatHandler for State {
 delegate_seat!(State);
 delegate_tablet_manager!(State);
 delegate_pointer_gestures!(State);
+delegate_text_input_manager!(State);
+
+impl InputMethodHandler for State {
+    fn new_popup(&mut self, surface: PopupSurface) {
+        if let Err(err) = self.niri.popups.track_popup(PopupKind::from(surface)) {
+            warn!("error tracking ime popup {err:?}");
+        }
+    }
+    fn parent_geometry(&self, parent: &WlSurface) -> Rectangle<i32, Logical> {
+        self.niri
+            .monitor_set
+            .find_window_and_output(parent)
+            .map(|(window, _)| window.geometry())
+            .unwrap_or_default()
+    }
+}
+
+delegate_input_method_manager!(State);
+delegate_virtual_keyboard_manager!(State);
 
 impl DataDeviceHandler for State {
     type SelectionUserData = ();

src/niri.rs

@@ -53,6 +53,7 @@ use smithay::wayland::compositor::{
 };
 use smithay::wayland::data_device::DataDeviceState;
 use smithay::wayland::dmabuf::DmabufFeedback;
+use smithay::wayland::input_method::InputMethodManagerState;
 use smithay::wayland::output::OutputManagerState;
 use smithay::wayland::pointer_gestures::PointerGesturesState;
 use smithay::wayland::presentation::PresentationState;
@@ -64,6 +65,8 @@ use smithay::wayland::shell::xdg::XdgShellState;
 use smithay::wayland::shm::ShmState;
 use smithay::wayland::socket::ListeningSocketSource;
 use smithay::wayland::tablet_manager::TabletManagerState;
+use smithay::wayland::text_input::TextInputManagerState;
+use smithay::wayland::virtual_keyboard::VirtualKeyboardManagerState;
 use zbus::fdo::RequestNameFlags;
 
 use crate::backend::{Backend, Tty, Winit};
@@ -108,6 +111,9 @@ pub struct Niri {
     pub output_manager_state: OutputManagerState,
     pub seat_state: SeatState<State>,
     pub tablet_state: TabletManagerState,
+    pub text_input_state: TextInputManagerState,
+    pub input_method_state: InputMethodManagerState,
+    pub virtual_keyboard_state: VirtualKeyboardManagerState,
     pub pointer_gestures_state: PointerGesturesState,
     pub data_device_state: DataDeviceState,
     pub primary_selection_state: PrimarySelectionState,
@@ -301,6 +307,11 @@ impl Niri {
         let presentation_state =
             PresentationState::new::<State>(&display_handle, CLOCK_MONOTONIC as u32);
 
+        let text_input_state = TextInputManagerState::new::<State>(&display_handle);
+        let input_method_state = InputMethodManagerState::new::<State>(&display_handle);
+        let virtual_keyboard_state =
+            VirtualKeyboardManagerState::new::<State, _>(&display_handle, |_| true);
+
         let mut seat: Seat<State> = seat_state.new_wl_seat(&display_handle, backend.seat_name());
         let xkb = XkbConfig {
             rules: &config_.input.keyboard.xkb.rules,
@@ -650,6 +661,9 @@ impl Niri {
             xdg_decoration_state,
             kde_decoration_state,
             layer_shell_state,
+            text_input_state,
+            input_method_state,
+            virtual_keyboard_state,
             shm_state,
             output_manager_state,
             seat_state,