feat: add selection and decoration protocols

compositor/src/handlers/mod.rs

@@ -3,8 +3,20 @@ mod xdg_shell;
 
 use smithay::{
     input::{Seat, SeatHandler, SeatState, pointer::CursorImageStatus},
-    reexports::wayland_server::protocol::wl_surface::WlSurface,
-    wayland::output::OutputHandler,
+    reexports::wayland_server::{Resource, protocol::wl_surface::WlSurface},
+    wayland::{
+        output::OutputHandler,
+        selection::{
+            SelectionHandler,
+            data_device::{
+                ClientDndGrabHandler, DataDeviceHandler, DataDeviceState, ServerDndGrabHandler,
+                set_data_device_focus,
+            },
+            primary_selection::{
+                PrimarySelectionHandler, PrimarySelectionState, set_primary_focus,
+            },
+        },
+    },
 };
 
 use crate::Ferese;
@@ -19,12 +31,40 @@ impl SeatHandler for Ferese {
     }
 
     fn cursor_image(&mut self, _seat: &Seat<Self>, _image: CursorImageStatus) {}
+
+    fn focus_changed(&mut self, seat: &Seat<Self>, focused: Option<&WlSurface>) {
+        let client = focused.and_then(|surface| self.display_handle.get_client(surface.id()).ok());
+        set_data_device_focus(&self.display_handle, seat, client.clone());
+        set_primary_focus(&self.display_handle, seat, client);
+    }
 }
 
 impl OutputHandler for Ferese {}
 
+impl SelectionHandler for Ferese {
+    type SelectionUserData = ();
+}
+
+impl ClientDndGrabHandler for Ferese {}
+impl ServerDndGrabHandler for Ferese {}
+
+impl DataDeviceHandler for Ferese {
+    fn data_device_state(&self) -> &DataDeviceState {
+        &self.data_device_state
+    }
+}
+
+impl PrimarySelectionHandler for Ferese {
+    fn primary_selection_state(&self) -> &PrimarySelectionState {
+        &self.primary_selection_state
+    }
+}
+
 smithay::delegate_compositor!(Ferese);
+smithay::delegate_data_device!(Ferese);
 smithay::delegate_output!(Ferese);
+smithay::delegate_primary_selection!(Ferese);
 smithay::delegate_seat!(Ferese);
 smithay::delegate_shm!(Ferese);
+smithay::delegate_xdg_decoration!(Ferese);
 smithay::delegate_xdg_shell!(Ferese);

compositor/src/handlers/xdg_shell.rs

@@ -2,10 +2,12 @@ use smithay::{
     desktop::{
         PopupKind, PopupManager, Space, Window, find_popup_root_surface, get_popup_toplevel_coords,
     },
+    reexports::wayland_protocols::xdg::decoration::zv1::server::zxdg_toplevel_decoration_v1::Mode,
     reexports::wayland_server::protocol::{wl_seat, wl_surface::WlSurface},
     utils::Serial,
     wayland::{
         compositor::with_states,
+        shell::xdg::decoration::XdgDecorationHandler,
         shell::xdg::{
             PopupSurface, PositionerState, ToplevelSurface, XdgShellHandler, XdgShellState,
             XdgToplevelSurfaceData,
@@ -60,6 +62,31 @@ impl XdgShellHandler for Ferese {
     fn grab(&mut self, _: PopupSurface, _: wl_seat::WlSeat, _: Serial) {}
 }
 
+impl XdgDecorationHandler for Ferese {
+    fn new_decoration(&mut self, toplevel: ToplevelSurface) {
+        set_decoration_mode(&toplevel, Mode::ClientSide);
+    }
+
+    fn request_mode(&mut self, toplevel: ToplevelSurface, mode: Mode) {
+        // Phase 1 negotiates decorations but does not yet draw a server frame.
+        // Honor CSD and safely fall back to CSD for premature SSD requests.
+        let mode = match mode {
+            Mode::ClientSide | Mode::ServerSide => Mode::ClientSide,
+            _ => Mode::ClientSide,
+        };
+        set_decoration_mode(&toplevel, mode);
+    }
+
+    fn unset_mode(&mut self, toplevel: ToplevelSurface) {
+        set_decoration_mode(&toplevel, Mode::ClientSide);
+    }
+}
+
+fn set_decoration_mode(toplevel: &ToplevelSurface, mode: Mode) {
+    toplevel.with_pending_state(|state| state.decoration_mode = Some(mode));
+    toplevel.send_pending_configure();
+}
+
 pub fn handle_commit(popups: &mut PopupManager, space: &Space<Window>, surface: &WlSurface) {
     if let Some(window) = space
         .elements()

compositor/src/state.rs

@@ -15,7 +15,9 @@ use smithay::{
     wayland::{
         compositor::{CompositorClientState, CompositorState},
         output::OutputManagerState,
+        selection::{data_device::DataDeviceState, primary_selection::PrimarySelectionState},
         shell::xdg::XdgShellState,
+        shell::xdg::decoration::XdgDecorationState,
         shm::ShmState,
         socket::ListeningSocketSource,
     },
@@ -30,7 +32,10 @@ pub struct Ferese {
     pub popups: PopupManager,
     pub seat: Seat<Self>,
     pub compositor_state: CompositorState,
+    pub data_device_state: DataDeviceState,
+    pub decoration_state: XdgDecorationState,
     pub output_manager_state: OutputManagerState,
+    pub primary_selection_state: PrimarySelectionState,
     pub seat_state: SeatState<Self>,
     pub shm_state: ShmState,
     pub xdg_shell_state: XdgShellState,
@@ -44,8 +49,11 @@ impl Ferese {
         let display_handle = display.handle();
         let compositor_state = CompositorState::new::<Self>(&display_handle);
         let xdg_shell_state = XdgShellState::new::<Self>(&display_handle);
+        let decoration_state = XdgDecorationState::new::<Self>(&display_handle);
         let shm_state = ShmState::new::<Self>(&display_handle, Vec::new());
         let output_manager_state = OutputManagerState::new_with_xdg_output::<Self>(&display_handle);
+        let data_device_state = DataDeviceState::new::<Self>(&display_handle);
+        let primary_selection_state = PrimarySelectionState::new::<Self>(&display_handle);
         let mut seat_state = SeatState::new();
         let mut seat = seat_state.new_wl_seat(&display_handle, "ferese-winit");
         seat.add_keyboard(Default::default(), 200, 25)?;
@@ -61,7 +69,10 @@ impl Ferese {
             popups: PopupManager::default(),
             seat,
             compositor_state,
+            data_device_state,
+            decoration_state,
             output_manager_state,
+            primary_selection_state,
             seat_state,
             shm_state,
             xdg_shell_state,