Refactor new editor state ownership model

new_editor/app/Composition/EditorShellPointerInteraction.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <cstdint>
+
+namespace XCEngine::UI::Editor::App {
+
+enum class EditorShellPointerOwner : std::uint8_t {
+    None = 0,
+    DockHost,
+    SceneViewport,
+    GameViewport,
+    HierarchyPanel,
+    ProjectPanel,
+};
+
+constexpr bool IsShellPointerOwner(EditorShellPointerOwner owner) {
+    return owner == EditorShellPointerOwner::DockHost ||
+        owner == EditorShellPointerOwner::SceneViewport ||
+        owner == EditorShellPointerOwner::GameViewport;
+}
+
+constexpr bool IsHostedContentPointerOwner(EditorShellPointerOwner owner) {
+    return owner == EditorShellPointerOwner::HierarchyPanel ||
+        owner == EditorShellPointerOwner::ProjectPanel;
+}
+
+} // namespace XCEngine::UI::Editor::App