config: add toplevel-tag window criteria

src/ifs/wl_surface/xdg_surface/xdg_toplevel.rs

@@ -92,6 +92,11 @@ pub enum Decoration {
     Server,
 }
 
+#[derive(Debug)]
+pub struct XdgToplevelToplevelData {
+    pub tag: RefCell<String>,
+}
+
 pub struct XdgToplevel {
     pub id: XdgToplevelId,
     pub state: Rc<State>,
@@ -112,6 +117,7 @@ pub struct XdgToplevel {
     is_mapped: Cell<bool>,
     dialog: CloneCell<Option<Rc<XdgDialogV1>>>,
     extents_set: Cell<bool>,
+    pub data: Rc<XdgToplevelToplevelData>,
 }
 
 impl Debug for XdgToplevel {
@@ -135,6 +141,9 @@ impl XdgToplevel {
         }
         let state = &surface.surface.client.state;
         let node_id = state.node_ids.next();
+        let data = Rc::new(XdgToplevelToplevelData {
+            tag: Default::default(),
+        });
         Self {
             id,
             state: state.clone(),
@@ -154,7 +163,7 @@ impl XdgToplevel {
                 state,
                 String::new(),
                 Some(surface.surface.client.clone()),
-                ToplevelType::XdgToplevel,
+                ToplevelType::XdgToplevel(data.clone()),
                 node_id,
                 slf,
             ),
@@ -162,6 +171,7 @@ impl XdgToplevel {
             is_mapped: Cell::new(false),
             dialog: Default::default(),
             extents_set: Cell::new(false),
+            data,
         }
     }
 

src/ifs/xdg_toplevel_tag_manager_v1.rs

@@ -1,9 +1,11 @@
 use {
     crate::{
         client::{Client, ClientError},
+        criteria::tlm::TL_CHANGED_TAG,
         globals::{Global, GlobalName},
         leaks::Tracker,
         object::{Object, Version},
+        tree::ToplevelNodeBase,
         wire::{XdgToplevelTagManagerV1Id, xdg_toplevel_tag_manager_v1::*},
     },
     std::rc::Rc,
@@ -72,9 +74,17 @@ impl XdgToplevelTagManagerV1RequestHandler for XdgToplevelTagManagerV1 {
 
     fn set_toplevel_tag(
         &self,
-        _req: SetToplevelTag<'_>,
+        req: SetToplevelTag<'_>,
         _slf: &Rc<Self>,
     ) -> Result<(), Self::Error> {
+        let tl = self.client.lookup(req.toplevel)?;
+        let tag = &mut *tl.data.tag.borrow_mut();
+        if tag == req.tag {
+            return Ok(());
+        }
+        tag.clear();
+        tag.push_str(req.tag);
+        tl.tl_data().property_changed(TL_CHANGED_TAG);
         Ok(())
     }