portal: implement window capture

src/wl_usr/usr_ifs/usr_jay_select_toplevel.rs

@@ -0,0 +1,71 @@
+use {
+    crate::{
+        utils::{
+            buffd::{MsgParser, MsgParserError},
+            clonecell::CloneCell,
+        },
+        wire::{jay_select_toplevel::*, JaySelectToplevelId},
+        wl_usr::{usr_ifs::usr_jay_toplevel::UsrJayToplevel, usr_object::UsrObject, UsrCon},
+    },
+    std::rc::Rc,
+    thiserror::Error,
+};
+
+pub struct UsrJaySelectToplevel {
+    pub id: JaySelectToplevelId,
+    pub con: Rc<UsrCon>,
+    pub owner: CloneCell<Option<Rc<dyn UsrJaySelectToplevelOwner>>>,
+}
+
+pub trait UsrJaySelectToplevelOwner {
+    fn done(&self, toplevel: Option<Rc<UsrJayToplevel>>);
+}
+
+impl UsrJaySelectToplevel {
+    fn done(&self, parser: MsgParser<'_, '_>) -> Result<(), UsrJaySelectToplevelError> {
+        let ev: Done = self.con.parse(self, parser)?;
+        let tl = if ev.id.is_none() {
+            None
+        } else {
+            let tl = Rc::new(UsrJayToplevel {
+                id: ev.id,
+                con: self.con.clone(),
+                owner: Default::default(),
+            });
+            self.con.add_object(tl.clone());
+            Some(tl)
+        };
+        match self.owner.get() {
+            Some(owner) => owner.done(tl),
+            _ => {
+                if let Some(tl) = tl {
+                    self.con.remove_obj(&*tl);
+                }
+            }
+        }
+        self.con.remove_obj(self);
+        Ok(())
+    }
+}
+
+usr_object_base! {
+    UsrJaySelectToplevel, JaySelectToplevel;
+
+    DONE => done,
+}
+
+impl UsrObject for UsrJaySelectToplevel {
+    fn destroy(&self) {
+        // nothing
+    }
+
+    fn break_loops(&self) {
+        self.owner.take();
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum UsrJaySelectToplevelError {
+    #[error("Parsing failed")]
+    MsgParserError(#[from] MsgParserError),
+}