feat: support to move wlr_layer_shell

src/platform_impl/linux/wayland/window/mod.rs

@@ -388,12 +388,13 @@ impl CoreWindow for Window {
     }
 
     fn outer_position(&self) -> Result<PhysicalPosition<i32>, RequestError> {
-        Err(NotSupportedError::new("window position information is not available on Wayland")
-            .into())
+        // XXX just for LayerShell
+        self.window_state.lock().unwrap().outer_position()
     }
 
-    fn set_outer_position(&self, _position: Position) {
-        // Not possible.
+    fn set_outer_position(&self, position: Position) {
+        // XXX just for LayerShell
+        self.window_state.lock().unwrap().set_outer_position(position);
     }
 
     fn surface_size(&self) -> PhysicalSize<u32> {

src/platform_impl/linux/wayland/window/state.rs

@@ -5,6 +5,7 @@ use std::sync::{Arc, Mutex, Weak};
 use std::time::Duration;
 
 use ahash::HashSet;
+use dpi::{PhysicalPosition, Position};
 use sctk::compositor::{CompositorState, Region, SurfaceData, SurfaceDataExt};
 use sctk::reexports::client::backend::ObjectId;
 use sctk::reexports::client::protocol::wl_seat::WlSeat;
@@ -733,6 +734,27 @@ impl WindowState {
         }
     }
 
+    #[inline]
+    pub fn outer_position(&self) -> Result<PhysicalPosition<i32>, RequestError> {
+        Err(NotSupportedError::new("window position information is not available on xdg Wayland")
+            .into())
+    }
+
+    pub fn set_outer_position(&self, position: Position) {
+        let position = position.to_logical(self.scale_factor);
+
+        match &self.shell_specific {
+            ShellSpecificState::Xdg { .. } => {
+                warn!("Change window position is not available on xdg Wayland",)
+            },
+            // XXX just works for LayerShell
+            // Probably we can save this change to get in the `outer_position` function
+            ShellSpecificState::WlrLayer { surface, .. } => {
+                surface.set_margin(position.y, 0, 0, position.x)
+            },
+        }
+    }
+
     /// Get the outer size of the window.
     #[inline]
     pub fn outer_size(&self) -> LogicalSize<u32> {