Refactor new editor state ownership model

new_editor/app/State/EditorCommandFocusService.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "State/EditorSession.h"
+
+namespace XCEngine::UI::Editor::App {
+
+class EditorCommandFocusService {
+public:
+    EditorActionRoute GetExplicitRoute() const {
+        return m_explicitRoute;
+    }
+
+    bool HasExplicitRoute() const {
+        return m_explicitRoute != EditorActionRoute::None;
+    }
+
+    EditorActionRoute ResolveRoute(
+        EditorActionRoute fallbackRoute = EditorActionRoute::None) const {
+        return HasExplicitRoute() ? m_explicitRoute : fallbackRoute;
+    }
+
+    bool ClaimFocus(EditorActionRoute route) {
+        if (route == EditorActionRoute::None) {
+            return false;
+        }
+
+        const bool changed = m_explicitRoute != route;
+        m_explicitRoute = route;
+        return changed;
+    }
+
+    void ClearFocus(EditorActionRoute route = EditorActionRoute::None) {
+        if (route == EditorActionRoute::None || m_explicitRoute == route) {
+            m_explicitRoute = EditorActionRoute::None;
+        }
+    }
+
+private:
+    EditorActionRoute m_explicitRoute = EditorActionRoute::None;
+};
+
+} // namespace XCEngine::UI::Editor::App