Build XCEditor workspace viewport compose foundation

new_editor/include/XCEditor/Widgets/UIEditorDockHost.h

@@ -117,6 +117,12 @@ struct UIEditorDockHostLayout {
     std::vector<UIEditorDockHostTabStackLayout> tabStacks = {};
 };
 
+// Allows higher-level compose to own panel body presentation while DockHost
+// keeps drawing the surrounding chrome/frame.
+struct UIEditorDockHostForegroundOptions {
+    std::vector<std::string> externalBodyPanelIds = {};
+};
+
 const UIEditorDockHostSplitterLayout* FindUIEditorDockHostSplitterLayout(
     const UIEditorDockHostLayout& layout,
     std::string_view nodeId);
@@ -142,9 +148,16 @@ void AppendUIEditorDockHostBackground(
 void AppendUIEditorDockHostForeground(
     ::XCEngine::UI::UIDrawList& drawList,
     const UIEditorDockHostLayout& layout,
+    const UIEditorDockHostForegroundOptions& options = {},
     const UIEditorDockHostPalette& palette = {},
     const UIEditorDockHostMetrics& metrics = {});
 
+void AppendUIEditorDockHostForeground(
+    ::XCEngine::UI::UIDrawList& drawList,
+    const UIEditorDockHostLayout& layout,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics = {});
+
 void AppendUIEditorDockHost(
     ::XCEngine::UI::UIDrawList& drawList,
     const ::XCEngine::UI::UIRect& bounds,
@@ -152,7 +165,18 @@ void AppendUIEditorDockHost(
     const UIEditorWorkspaceModel& workspace,
     const UIEditorWorkspaceSession& session,
     const UIEditorDockHostState& state = {},
+    const UIEditorDockHostForegroundOptions& foregroundOptions = {},
     const UIEditorDockHostPalette& palette = {},
     const UIEditorDockHostMetrics& metrics = {});
 
+void AppendUIEditorDockHost(
+    ::XCEngine::UI::UIDrawList& drawList,
+    const ::XCEngine::UI::UIRect& bounds,
+    const UIEditorPanelRegistry& panelRegistry,
+    const UIEditorWorkspaceModel& workspace,
+    const UIEditorWorkspaceSession& session,
+    const UIEditorDockHostState& state,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics = {});
+
 } // namespace XCEngine::UI::Editor::Widgets