From 04d243699cbde40fe69472f4c4df38c36f7942ef Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Tue, 18 Nov 2025 17:31:23 +0800
Subject: Move delete later to platform::gui.

---
 include/cru/platform/gui/DeleteLater.h       | 41 ++++++++++++++++++++++++++++
 include/cru/platform/gui/UiApplication.h     | 14 ++++++++++
 include/cru/platform/gui/win/UiApplication.h |  3 ++
 3 files changed, 58 insertions(+)
 create mode 100644 include/cru/platform/gui/DeleteLater.h

(limited to 'include/cru/platform/gui')

diff --git a/include/cru/platform/gui/DeleteLater.h b/include/cru/platform/gui/DeleteLater.h
new file mode 100644
index 00000000..c0578974
--- /dev/null
+++ b/include/cru/platform/gui/DeleteLater.h
@@ -0,0 +1,41 @@
+#pragma once
+#include "UiApplication.h"
+
+#include <cru/base/Guard.h>
+#include <memory>
+#include <utility>
+
+namespace cru::platform::gui {
+template <typename TSelf>
+class DeleteLaterImpl {
+  CRU_DEFINE_CLASS_LOG_TAG("cru::platform::gui::DeleteLaterImpl")
+
+ public:
+  virtual ~DeleteLaterImpl() {}
+
+  void DeleteLater() {
+    IUiApplication::GetInstance()->DeleteLater(static_cast<TSelf*>(this));
+  }
+};
+
+namespace details {
+template <typename T>
+struct DeleteLaterPtrDeleter {
+  void operator()(T* p) const noexcept { p->DeleteLater(); }
+};
+}  // namespace details
+
+template <typename T>
+using DeleteLaterPtr = std::unique_ptr<T, details::DeleteLaterPtrDeleter<T>>;
+
+template <typename T>
+DeleteLaterPtr<T> ToDeleteLaterPtr(std::unique_ptr<T>&& p) {
+  return DeleteLaterPtr<T>(p.release());
+}
+
+template <typename T, typename... Args>
+DeleteLaterPtr<T> MakeDeleteLater(Args&&... args) {
+  return DeleteLaterPtr<T>(new T(std::forward<Args>(args)...));
+}
+
+}  // namespace cru::platform::gui
diff --git a/include/cru/platform/gui/UiApplication.h b/include/cru/platform/gui/UiApplication.h
index 84011275..c4454b2e 100644
--- a/include/cru/platform/gui/UiApplication.h
+++ b/include/cru/platform/gui/UiApplication.h
@@ -16,6 +16,18 @@ struct INativeWindow;
 struct IInputMethodContext;
 struct IClipboard;
 
+class CRU_PLATFORM_GUI_API DeleteLaterPool : public Object {
+ public:
+  void Add(Object* object);
+
+  void Clean();
+
+ private:
+  // May contain duplicate object pointer. When performing deleting, use a set
+  // to record deleted objects to avoid double delete.
+  std::vector<Object*> pool_;
+};
+
 // The entry point of a ui application.
 struct CRU_PLATFORM_GUI_API IUiApplication : public virtual IPlatformResource {
  public:
@@ -51,6 +63,8 @@ struct CRU_PLATFORM_GUI_API IUiApplication : public virtual IPlatformResource {
   // result in no-op.
   virtual void CancelTimer(long long id) = 0;
 
+  virtual void DeleteLater(Object* object) = 0;
+
   virtual std::vector<INativeWindow*> GetAllWindow() = 0;
 
   virtual INativeWindow* CreateWindow() = 0;
diff --git a/include/cru/platform/gui/win/UiApplication.h b/include/cru/platform/gui/win/UiApplication.h
index b2d1f39b..c5057c4b 100644
--- a/include/cru/platform/gui/win/UiApplication.h
+++ b/include/cru/platform/gui/win/UiApplication.h
@@ -48,6 +48,8 @@ class CRU_WIN_GUI_API WinUiApplication : public WinNativeResource,
                         std::function<void()> action) override;
   void CancelTimer(long long id) override;
 
+  void DeleteLater(Object* object) override;
+
   std::vector<INativeWindow*> GetAllWindow() override;
   INativeWindow* CreateWindow() override;
 
@@ -79,6 +81,7 @@ class CRU_WIN_GUI_API WinUiApplication : public WinNativeResource,
       graph_factory_;
 
   TimerRegistry<std::function<void()>> timers_;
+  DeleteLaterPool delete_later_pool_;
 
   std::unique_ptr<WindowClass> general_window_class_;
   std::vector<WinNativeWindow*> windows_;
-- 
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