Hide ImGui compat factories behind legacy XCUI interop

docs/plan/XCUI_Phase_Status_2026-04-05.md

@@ -32,11 +32,16 @@ Old `editor` replacement is explicitly out of scope for this phase.
   - `Application.cpp` no longer directly includes `<imgui.h>`, even though the compatibility host path is still compiled into `new_editor`
 - The `new_editor` build now also has an explicit compatibility-source slice:
   - legacy ImGui shell sources and vendored ImGui backend sources are now grouped into a dedicated compatibility static library instead of being compiled directly as part of the main `XCNewEditor` source list
-  - the main `XCNewEditor` target no longer compiles those legacy sources directly, but it still carries `${IMGUI_SOURCE_DIR}` / `${IMGUI_SOURCE_DIR}/backends` on its private include surface and still reaches `<imgui.h>` through older editor bridge headers such as `editor/src/UI/ImGuiBackendBridge.h`
-- The next checkpoint to append after this file should be the main-target header-isolation milestone:
+- The main-target header-isolation milestone is now also landed in `new_editor`:
   - `XCNewEditor` drops direct `${IMGUI_SOURCE_DIR}` / `${IMGUI_SOURCE_DIR}/backends` include-directory requirements
+  - the generated `XCNewEditor.vcxproj` no longer advertises `imgui-src` or `editor/src` on the default include surface
   - the default native compile path no longer reaches `<imgui.h>` through `editor/src/UI/ImGuiBackendBridge.h` or equivalent bridge headers
   - `XCNewEditorImGuiCompat` remains the explicit compatibility-only consumer of legacy ImGui headers and backend sources
+- The compositor/font compat boundary is now tighter as well:
+  - `IWindowUICompositor.h` and `IEditorHostCompositor.h` no longer declare `CreateImGui*` factories on the generic XCUI seam
+  - ImGui factory entry points now live only in `LegacyImGuiHostInterop.h`
+  - `XCUIEditorFontSetup.h` no longer exposes `ImFont` / `ImFontAtlas`; the public API is now a current-context font bootstrap helper
+  - `XCUIStandaloneTextAtlasProvider.h` no longer depends on the ImGui-oriented font bootstrap header
 - Old `editor` replacement remains deferred; all active execution still stays inside XCUI shared code and `new_editor`.
 
 ## Three-Layer Status
@@ -131,7 +136,7 @@ Current gap:
 Current gap:
 
 - The default shell host is now native, but the legacy ImGui shell and panel path still exists as a compatibility host and is still compiled into `new_editor`.
-- The default native shell path is now split away from direct `ImGui::*` calls at the translation-unit/source-list level, but the main `XCNewEditor` target still keeps ImGui on its header/include surface through `target_include_directories(...)` and older editor bridge headers.
+- The default native shell path is now split away from direct `ImGui::*` calls at the main-target header/include level, but the legacy ImGui shell and panel implementations still remain compiled behind `XCNewEditorImGuiCompat`.
 - The native shell currently proves direct runtime composition, but its shell chrome is still a bespoke `Application`-side layout rather than a fully shared XCUI-authored editor shell document.
 - Editor-specialized widgets are still incomplete at the shared-module level: the authored prototypes exist, but virtualization, multi-selection/focus traversal, toolbar/menu chrome, menu interaction widgets, and icon-atlas widgets are not yet extracted into reusable XCUI modules.
 - The default native text path now uses a standalone Windows/GDI atlas through `XCUIStandaloneTextAtlasProvider`, but that provider still lives inside `new_editor` and is not yet promoted into a shared/cross-platform text subsystem.
@@ -147,6 +152,7 @@ Current gap:
 - `new_editor_xcui_rhi_render_backend_tests`: `5/5`
 - `new_editor_xcui_standalone_text_atlas_provider_tests`: `6/6`
 - `new_editor_xcui_hosted_preview_presenter_tests`: `20/20`
+- `new_editor_legacy_imgui_host_interop_tests`: `4/4`
 - `new_editor_imgui_window_ui_compositor_tests`: `7/7`
 - `new_editor_native_window_ui_compositor_tests`: `8/8`
 - `new_editor_xcui_editor_command_router_tests`: `5/5`
@@ -237,6 +243,7 @@ Current gap:
   - `ImGuiHostCompositor`
   - `Application` frame/present flow routed through the compositor instead of direct `m_imguiBackend` ownership
 - The window-level XCUI compositor seam now also has a dedicated regression target around `ImGuiWindowUICompositor`, covering initialization, render-frame ordering, Win32 message forwarding, texture registration forwarding, and shutdown safety.
+- The legacy compatibility seam now also has dedicated regression coverage around `LegacyImGuiHostInterop`, covering compat factory wiring, ImGui input-capture forwarding, legacy font bootstrap, and the disabled demo-window path.
 - The window compositor and hosted-preview seams gained more edge-case coverage around no-UI render passes, compositor re-initialization/rebinding, partial logical-size fallback, and descriptor reuse for repeated queued-frame keys.
 - `new_editor` now has a dedicated `XCUIEditorCommandRouter` test target covering command registration, replacement, enable predicates, accelerator matching, and policy gates around focus/keyboard capture/text input.
 - `Application` now integrates `XCUIEditorCommandRouter` into the shell itself:
@@ -292,14 +299,18 @@ Current gap:
 - `new_editor` build composition is now split into main/native and compatibility slices:
   - the main `XCNewEditor` target no longer compiles legacy ImGui shell/panel/backend source files directly
   - legacy ImGui shell/panel/backend sources plus vendored ImGui sources now build behind a dedicated compatibility static library that the main executable links
-  - the remaining build-side cleanup is narrower now: `XCNewEditor` still carries ImGui include directories and older editor bridge headers on its direct compile surface, so the next checkpoint is header/include isolation rather than another source-list split
+  - the main target no longer carries ImGui include directories or older editor bridge headers on its direct compile surface; those remain confined to the compatibility slice
+- The default XCUI compile seam is now also cleaner:
+  - generic compositor headers no longer advertise compat-only `CreateImGui*` factories
+  - compat-only host/window compositor factories now live behind `LegacyImGuiHostInterop.*`
+  - public font bootstrap headers no longer leak `ImFont` / `ImFontAtlas` types into generic XCUI consumers
 
 ## Phase Risks Still Open
 
 - Schema instance validation is still open beyond `.xcschema` self-definition and artifact round-trip coverage.
 - `ScrollView` is still authored/static; no wheel-driven scrolling or virtualization yet.
-- `Application.cpp` is now split away from direct `ImGui::*` calls, but `XCNewEditor` still depends on ImGui at the header/include level because `new_editor/CMakeLists.txt` still adds `${IMGUI_SOURCE_DIR}` / `${IMGUI_SOURCE_DIR}/backends` to the main target and the editor bridge chain still reaches `editor/src/UI/ImGuiBackendBridge.h` -> `<imgui.h>`.
-- `XCNewEditorImGuiCompat` is now the compatibility-source slice, but the main executable still links it unconditionally and has not yet reduced its direct include surface to a compat-free default-path baseline.
+- `XCNewEditor` no longer depends on ImGui at the default-path header/include level, but `XCNewEditorImGuiCompat` is still linked into the executable and still houses the legacy shell/panel path.
+- Legacy panel implementations such as `XCUIDemoPanel` / `XCUILayoutLabPanel` still render as ImGui windows inside the compatibility slice, so editor-layer behavior is not yet fully carried by XCUI-native shell composition.
 - The default native text path now owns its atlas without ImGui, but the provider is still Windows-only and remains trapped inside `new_editor` instead of a shared/cross-platform text layer.
 - Hosted-preview compatibility presentation still depends on an ImGui-only inline presenter path when not using the queued native surface path.
 - Editor widget coverage is still prototype-driven inside `LayoutLab`; it has not yet been promoted into a full reusable shared widget/runtime layer with command routing, virtualization, and property-edit transactions.
@@ -307,12 +318,12 @@ Current gap:
 ## Execution-Plan Alignment
 
 - Against `XCUI完整架构设计与执行计划.md`, current `new_editor` progress should be treated as an early `Phase 8` foothold rather than full `Milestone E` completion:
-  - landed: `NativeWindowUICompositor`, native shell packet composition, native hosted-preview publication, XCUI-owned texture registrations, native panel surface-image presentation, standalone native text-atlas ownership inside `new_editor`, legacy `Application` TU split, and `XCNewEditorImGuiCompat`
-  - not yet landed: main-target header/include isolation from ImGui, promotion of the native text-atlas path into a shared/cross-platform text subsystem, shared XCUI-authored editor shell chrome
+  - landed: `NativeWindowUICompositor`, native shell packet composition, native hosted-preview publication, XCUI-owned texture registrations, native panel surface-image presentation, standalone native text-atlas ownership inside `new_editor`, legacy `Application` TU split, `XCNewEditorImGuiCompat`, main-target header/include isolation from ImGui, and compat-only factory/font seam tightening
+  - not yet landed: promotion of the native text-atlas path into a shared/cross-platform text subsystem, shared XCUI-authored editor shell chrome, and retirement of legacy ImGui-window panel implementations
 - That means the next de-ImGui push should not keep centering on hosted-preview publication; that milestone is now effectively closed for the default native shell path.
 - The real remaining default-path blockers are:
-  - remove the main `XCNewEditor` target's direct ImGui header dependency by cutting the `D3D12WindowRenderer` / `ImGuiBackendBridge` include chain off the default compile path
-  - stop treating ImGui include paths as part of the default `new_editor` compilation surface, leaving them only on the compatibility slice
+  - move editor-layer behavior off the legacy ImGui-window panel implementations and into native/XCUI shell composition
+  - keep compat-only factories/types from drifting back into generic XCUI seams while the compatibility slice remains linked
   - harden and promote `XCUIStandaloneTextAtlasProvider` / editor font bootstrap into a shared native text subsystem
   - move native shell chrome out of bespoke `Application` layout code and into a shared XCUI shell model or authored shell document
 
@@ -320,7 +331,7 @@ Current gap:
 
 1. Expand runtime/game-layer ownership from the current `SceneRuntime` UI context into scene-declared HUD/menu bootstrapping, draw submission, and higher-level runtime UI policies.
 2. Promote the current editor-facing widget prototypes out of authored `LayoutLab` content and into reusable XCUI widget/runtime modules, then continue with toolbar/menu chrome, shell-state adoption, virtualization, and broader focus/multi-selection behavior.
-3. Finish the remaining main-target de-ImGui cleanup first: remove direct ImGui header/include requirements from `XCNewEditor`, keep ImGui confined to `XCNewEditorImGuiCompat`, and append the next checkpoint once the default native compile path no longer reaches `<imgui.h>`.
-4. Promote the current standalone native text/font path out of `new_editor`, harden its atlas invalidation/caching contract, and remove the remaining default-path ImGui text/bootstrap ownership around compatibility-only code.
-5. Promote the native shell chrome and card layout out of bespoke `Application` code into a shared XCUI/editor-layer shell model or authored shell document.
+3. Push the remaining de-ImGui cleanup from build/header isolation into behavior isolation: keep ImGui confined to `XCNewEditorImGuiCompat`, keep generic XCUI seams free of compat-only factories/types, and keep shrinking the legacy shell boundary.
+4. Promote the current standalone native text/font path out of `new_editor`, harden its atlas invalidation/caching contract, and keep the remaining font/bootstrap ownership compatibility-only.
+5. Promote the native shell chrome and card layout out of bespoke `Application` code into a shared XCUI/editor-layer shell model or authored shell document, then retire the remaining ImGui-window panel path.
 6. Continue phased validation, commit, push, and plan refresh after each stable batch.

new_editor/src/XCUIBackend/IEditorHostCompositor.h

@@ -61,8 +61,6 @@ public:
     virtual void FreeTextureDescriptor(const UITextureRegistration& registration) = 0;
 };
 
-std::unique_ptr<IEditorHostCompositor> CreateImGuiHostCompositor();
-
 } // namespace XCUIBackend
 } // namespace Editor
 } // namespace XCEngine

new_editor/src/XCUIBackend/IWindowUICompositor.h

@@ -61,7 +61,6 @@ public:
     virtual void FreeTextureDescriptor(const UITextureRegistration& registration) = 0;
 };
 
-std::unique_ptr<IWindowUICompositor> CreateImGuiWindowUICompositor();
 std::unique_ptr<IWindowUICompositor> CreateNativeWindowUICompositor();
 
 } // namespace XCUIBackend

new_editor/src/XCUIBackend/ImGuiWindowUICompositor.h

@@ -13,7 +13,7 @@ namespace XCUIBackend {
 class ImGuiWindowUICompositor final : public IWindowUICompositor {
 public:
     explicit ImGuiWindowUICompositor(
-        std::unique_ptr<IEditorHostCompositor> hostCompositor = CreateImGuiHostCompositor())
+        std::unique_ptr<IEditorHostCompositor> hostCompositor)
         : m_hostCompositor(std::move(hostCompositor)) {
     }
 
@@ -79,10 +79,6 @@ private:
     std::unique_ptr<IEditorHostCompositor> m_hostCompositor;
 };
 
-inline std::unique_ptr<IWindowUICompositor> CreateImGuiWindowUICompositor() {
-    return std::make_unique<ImGuiWindowUICompositor>();
-}
-
 } // namespace XCUIBackend
 } // namespace Editor
 } // namespace XCEngine

new_editor/src/XCUIBackend/LegacyImGuiHostInterop.cpp

@@ -12,14 +12,11 @@ namespace Editor {
 namespace XCUIBackend {
 
 bool ConfigureLegacyImGuiHostFonts() {
-    ImGuiIO& io = ImGui::GetIO();
-    ImFont* uiFont = nullptr;
-    if (!BuildDefaultXCUIEditorFontAtlas(*io.Fonts, uiFont)) {
-        return false;
-    }
+    return ConfigureDefaultXCUIEditorFontsForCurrentContext();
+}
 
-    io.FontDefault = uiFont;
-    return io.FontDefault != nullptr;
+std::unique_ptr<IWindowUICompositor> CreateImGuiWindowUICompositor() {
+    return std::make_unique<ImGuiWindowUICompositor>(CreateImGuiHostCompositor());
 }
 
 std::unique_ptr<IWindowUICompositor> CreateLegacyImGuiWindowUICompositor() {

new_editor/src/XCUIBackend/LegacyImGuiHostInterop.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "XCUIBackend/IEditorHostCompositor.h"
 #include "XCUIBackend/XCUIInputBridge.h"
 #include "XCUIBackend/IWindowUICompositor.h"
 #include "XCUIBackend/XCUIHostedPreviewPresenter.h"
@@ -13,6 +14,10 @@ namespace XCUIBackend {
 
 bool ConfigureLegacyImGuiHostFonts();
 
+std::unique_ptr<IEditorHostCompositor> CreateImGuiHostCompositor();
+
+std::unique_ptr<IWindowUICompositor> CreateImGuiWindowUICompositor();
+
 std::unique_ptr<IWindowUICompositor> CreateLegacyImGuiWindowUICompositor();
 
 std::unique_ptr<IXCUIHostedPreviewPresenter> CreateLegacyImGuiHostedPreviewPresenter();

new_editor/src/XCUIBackend/XCUIEditorFontSetup.cpp

@@ -12,8 +12,6 @@ constexpr float kUiFontSize = 18.0f;
 constexpr const char* kPrimaryUiFontPath = "C:/Windows/Fonts/segoeui.ttf";
 constexpr const char* kChineseFallbackFontPath = "C:/Windows/Fonts/msyh.ttc";
 
-} // namespace
-
 bool BuildDefaultXCUIEditorFontAtlas(::ImFontAtlas& atlas, ::ImFont*& outDefaultFont) {
     outDefaultFont = nullptr;
     atlas.Clear();
@@ -55,6 +53,19 @@ bool BuildDefaultXCUIEditorFontAtlas(::ImFontAtlas& atlas, ::ImFont*& outDefault
     return outDefaultFont != nullptr;
 }
 
+} // namespace
+
+bool ConfigureDefaultXCUIEditorFontsForCurrentContext() {
+    ImGuiIO& io = ImGui::GetIO();
+    ImFont* uiFont = nullptr;
+    if (!BuildDefaultXCUIEditorFontAtlas(*io.Fonts, uiFont)) {
+        return false;
+    }
+
+    io.FontDefault = uiFont;
+    return io.FontDefault != nullptr;
+}
+
 } // namespace XCUIBackend
 } // namespace Editor
 } // namespace XCEngine

new_editor/src/XCUIBackend/XCUIEditorFontSetup.h

@@ -1,13 +1,10 @@
 #pragma once
 
-struct ImFont;
-struct ImFontAtlas;
-
 namespace XCEngine {
 namespace Editor {
 namespace XCUIBackend {
 
-bool BuildDefaultXCUIEditorFontAtlas(::ImFontAtlas& atlas, ::ImFont*& outDefaultFont);
+bool ConfigureDefaultXCUIEditorFontsForCurrentContext();
 
 } // namespace XCUIBackend
 } // namespace Editor

new_editor/src/XCUIBackend/XCUIStandaloneTextAtlasProvider.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include "IXCUITextAtlasProvider.h"
-#include "XCUIEditorFontSetup.h"
 
 #include <memory>
 

tests/NewEditor/test_imgui_window_ui_compositor.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "Platform/D3D12WindowRenderer.h"
 #include "XCUIBackend/IEditorHostCompositor.h"
 #include "XCUIBackend/ImGuiWindowUICompositor.h"
 #include "XCUIBackend/UITextureRegistration.h"

tests/NewEditor/test_legacy_imgui_host_interop.cpp

@@ -0,0 +1,78 @@
+#include <gtest/gtest.h>
+
+#include "XCUIBackend/LegacyImGuiHostInterop.h"
+
+#include <imgui.h>
+
+namespace {
+
+using XCEngine::Editor::XCUIBackend::ApplyLegacyImGuiHostInputCapture;
+using XCEngine::Editor::XCUIBackend::ConfigureLegacyImGuiHostFonts;
+using XCEngine::Editor::XCUIBackend::CreateLegacyImGuiHostedPreviewPresenter;
+using XCEngine::Editor::XCUIBackend::CreateLegacyImGuiPanelCanvasHost;
+using XCEngine::Editor::XCUIBackend::CreateLegacyImGuiWindowUICompositor;
+using XCEngine::Editor::XCUIBackend::RenderLegacyImGuiDemoWindow;
+using XCEngine::Editor::XCUIBackend::XCUIPanelCanvasHostBackend;
+using XCEngine::Editor::XCUIBackend::XCUIInputBridgeFrameSnapshot;
+
+class ScopedImGuiContext final {
+public:
+    ScopedImGuiContext() {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+    }
+
+    ~ScopedImGuiContext() {
+        ImGui::DestroyContext();
+    }
+
+    ScopedImGuiContext(const ScopedImGuiContext&) = delete;
+    ScopedImGuiContext& operator=(const ScopedImGuiContext&) = delete;
+};
+
+TEST(LegacyImGuiHostInteropTest, CreatesLegacyHostAdaptersWithImGuiBackends) {
+    auto compositor = CreateLegacyImGuiWindowUICompositor();
+    auto presenter = CreateLegacyImGuiHostedPreviewPresenter();
+    auto canvasHost = CreateLegacyImGuiPanelCanvasHost();
+
+    ASSERT_NE(compositor, nullptr);
+    ASSERT_NE(presenter, nullptr);
+    ASSERT_NE(canvasHost, nullptr);
+    EXPECT_EQ(canvasHost->GetBackend(), XCUIPanelCanvasHostBackend::ImGui);
+
+    const auto capabilities = canvasHost->GetCapabilities();
+    EXPECT_TRUE(capabilities.supportsPointerHitTesting);
+    EXPECT_TRUE(capabilities.supportsHostedSurfaceImages);
+    EXPECT_TRUE(capabilities.supportsPrimitiveOverlays);
+}
+
+TEST(LegacyImGuiHostInteropTest, ApplyInputCaptureCopiesImGuiIoFlagsIntoSnapshot) {
+    ScopedImGuiContext context = {};
+    ImGuiIO& io = ImGui::GetIO();
+    io.WantCaptureKeyboard = true;
+    io.WantTextInput = true;
+
+    XCUIInputBridgeFrameSnapshot snapshot = {};
+    ApplyLegacyImGuiHostInputCapture(snapshot);
+
+    EXPECT_TRUE(snapshot.wantCaptureKeyboard);
+    EXPECT_TRUE(snapshot.wantTextInput);
+}
+
+TEST(LegacyImGuiHostInteropTest, ConfigureFontsPopulatesDefaultFont) {
+    ScopedImGuiContext context = {};
+
+    ASSERT_TRUE(ConfigureLegacyImGuiHostFonts());
+    EXPECT_NE(ImGui::GetIO().FontDefault, nullptr);
+    EXPECT_GT(ImGui::GetIO().Fonts->Fonts.Size, 0);
+}
+
+TEST(LegacyImGuiHostInteropTest, RenderDemoWindowSkipsWorkWhenVisibilityIsDisabled) {
+    ScopedImGuiContext context = {};
+    bool visible = false;
+
+    EXPECT_FALSE(RenderLegacyImGuiDemoWindow(visible));
+    EXPECT_FALSE(visible);
+}
+
+} // namespace