wayland: use code generation for wl_usr event handlers

src/wl_usr/usr_ifs/usr_wl_buffer.rs

@@ -1,28 +1,28 @@
 use {
     crate::{
-        utils::{
-            buffd::{MsgParser, MsgParserError},
-            clonecell::CloneCell,
-        },
+        object::Version,
+        utils::clonecell::CloneCell,
         wire::{wl_buffer::*, WlBufferId},
         wl_usr::{usr_object::UsrObject, UsrCon},
     },
-    std::rc::Rc,
+    std::{convert::Infallible, rc::Rc},
 };
 
 pub struct UsrWlBuffer {
     pub id: WlBufferId,
     pub con: Rc<UsrCon>,
     pub owner: CloneCell<Option<Rc<dyn UsrWlBufferOwner>>>,
+    pub version: Version,
 }
 
 pub trait UsrWlBufferOwner {
     fn release(&self) {}
 }
 
-impl UsrWlBuffer {
-    fn release(&self, parser: MsgParser<'_, '_>) -> Result<(), MsgParserError> {
-        let _ev: Release = self.con.parse(self, parser)?;
+impl WlBufferEventHandler for UsrWlBuffer {
+    type Error = Infallible;
+
+    fn release(&self, _ev: Release, _slf: &Rc<Self>) -> Result<(), Self::Error> {
         if let Some(owner) = self.owner.get() {
             owner.release();
         }
@@ -31,9 +31,8 @@ impl UsrWlBuffer {
 }
 
 usr_object_base! {
-    UsrWlBuffer, WlBuffer;
-
-    RELEASE => release,
+    self = UsrWlBuffer = WlBuffer;
+    version = self.version;
 }
 
 impl UsrObject for UsrWlBuffer {