ei: add support for libei

src/ei/ei_ifs/ei_pointer.rs

@@ -0,0 +1,71 @@
+use {
+    crate::{
+        ei::{
+            ei_client::{EiClient, EiClientError},
+            ei_ifs::ei_device::{EiDevice, EiDeviceInterface},
+            ei_object::{EiObject, EiVersion},
+        },
+        fixed::Fixed,
+        leaks::Tracker,
+        wire_ei::{
+            ei_pointer::{
+                ClientMotionRelative, EiPointerRequestHandler, Release, ServerMotionRelative,
+            },
+            EiPointerId,
+        },
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct EiPointer {
+    pub id: EiPointerId,
+    pub client: Rc<EiClient>,
+    pub tracker: Tracker<Self>,
+    pub version: EiVersion,
+    pub device: Rc<EiDevice>,
+}
+
+ei_device_interface!(EiPointer, ei_pointer, pointer);
+
+impl EiPointer {
+    pub fn send_motion(&self, dx: Fixed, dy: Fixed) {
+        self.client.event(ServerMotionRelative {
+            self_id: self.id,
+            x: dx.to_f32(),
+            y: dy.to_f32(),
+        });
+    }
+}
+
+impl EiPointerRequestHandler for EiPointer {
+    type Error = EiPointerError;
+
+    fn release(&self, _req: Release, _slf: &Rc<Self>) -> Result<(), Self::Error> {
+        self.destroy()?;
+        Ok(())
+    }
+
+    fn client_motion_relative(
+        &self,
+        req: ClientMotionRelative,
+        _slf: &Rc<Self>,
+    ) -> Result<(), Self::Error> {
+        self.device.relative_motion.set(Some((req.x, req.y)));
+        Ok(())
+    }
+}
+
+ei_object_base! {
+    self = EiPointer;
+    version = self.version;
+}
+
+impl EiObject for EiPointer {}
+
+#[derive(Debug, Error)]
+pub enum EiPointerError {
+    #[error(transparent)]
+    EiClientError(Box<EiClientError>),
+}
+efrom!(EiPointerError, EiClientError);