Add managed Window resource and native shell operations

src/document.rs

@@ -19,6 +19,8 @@ pub struct NamespaceState {
     pub submission: u64,
     pub document: RenderDocument,
     pub viewport: Option<crate::layout::Size>,
+    pub runtime_session: u64,
+    pub window_commands: Vec<crate::window::Envelope>,
 }
 
 impl Default for NamespaceState {
@@ -29,11 +31,32 @@ impl Default for NamespaceState {
             submission: 0,
             document: RenderDocument::default(),
             viewport: None,
+            runtime_session: 0,
+            window_commands: Vec::new(),
         }
     }
 }
 
 impl NamespaceState {
+    pub fn publish_window_commands(&mut self, session: u64, commands: Vec<crate::window::Command>) {
+        if self.runtime_session != session {
+            self.window_commands.clear();
+        }
+        self.runtime_session = session;
+        if session == 0 {
+            self.window_commands.clear();
+            return;
+        }
+        for command in commands {
+            self.window_commands
+                .retain(|old| !old.command.same_kind(&command));
+            self.window_commands
+                .push(crate::window::Envelope { session, command });
+        }
+        self.window_commands
+            .sort_by_key(|command| command.command.sequence);
+    }
+
     pub fn next_submission(&self) -> Result<u64> {
         self.submission
             .checked_add(1)
@@ -61,6 +84,8 @@ impl NamespaceState {
             .context("revision counter exhausted")?;
         self.submission = submission;
         self.document = RenderDocument::default();
+        self.runtime_session = 0;
+        self.window_commands.clear();
         self.revision = revision;
         Ok(revision)
     }
@@ -477,3 +502,34 @@ mod tests {
         );
     }
 }
+
+#[cfg(test)]
+mod window_projection_tests {
+    use super::*;
+    #[test]
+    fn replacement_and_reset_discard_old_window_projections() {
+        let mut state = NamespaceState::default();
+        let command = crate::window::Command {
+            window: 1,
+            sequence: 1,
+            action: crate::window::Action::Focus,
+        };
+        state.publish_window_commands(1, vec![command.clone()]);
+        let resize = crate::window::Command {
+            window: 1,
+            sequence: 2,
+            action: crate::window::Action::Resize {
+                width: 900.0,
+                height: 600.0,
+            },
+        };
+        state.publish_window_commands(1, vec![resize.clone()]);
+        assert_eq!(state.window_commands.len(), 2);
+        state.publish_window_commands(2, vec![resize]);
+        assert_eq!(state.window_commands.len(), 1);
+        assert_eq!(state.window_commands[0].session, 2);
+        state.clear().unwrap();
+        assert_eq!(state.runtime_session, 0);
+        assert!(state.window_commands.is_empty());
+    }
+}