1 files changed, 87 insertions, 0 deletions
diff --git a/include/cru/win/gui/InputMethod.hpp b/include/cru/win/gui/InputMethod.hpp
new file mode 100644
index 00000000..51a007d8
--- /dev/null
+++ b/include/cru/win/gui/InputMethod.hpp
@@ -0,0 +1,87 @@
+// Some useful information can be found from chromium code:
+// https://chromium.googlesource.com/chromium/chromium/+/refs/heads/master/ui/base/win/ime_input.h
+// https://chromium.googlesource.com/chromium/chromium/+/refs/heads/master/ui/base/win/ime_input.cc
+
+#pragma once
+#include "Resource.hpp"
+
+#include "WindowNativeMessageEventArgs.hpp"
+#include "cru/platform/gui/InputMethod.hpp"
+
+#include <imm.h>
+
+namespace cru::platform::gui::win {
+class AutoHIMC : public Object {
+  CRU_DEFINE_CLASS_LOG_TAG(u"cru::platform::gui::win::AutoHIMC")
+
+ public:
+  explicit AutoHIMC(HWND hwnd);
+
+  CRU_DELETE_COPY(AutoHIMC)
+
+  AutoHIMC(AutoHIMC&& other);
+  AutoHIMC& operator=(AutoHIMC&& other);
+
+  ~AutoHIMC() override;
+
+  HWND GetHwnd() const { return hwnd_; }
+
+  HIMC Get() const { return handle_; }
+
+ private:
+  HWND hwnd_;
+  HIMC handle_;
+};
+
+class WinInputMethodContext : public WinNativeResource,
+                              public virtual IInputMethodContext {
+  CRU_DEFINE_CLASS_LOG_TAG(u"cru::platform::gui::win::WinInputMethodContext")
+
+ public:
+  WinInputMethodContext(gsl::not_null<WinNativeWindow*> window);
+
+  CRU_DELETE_COPY(WinInputMethodContext)
+  CRU_DELETE_MOVE(WinInputMethodContext)
+
+  ~WinInputMethodContext() override;
+
+  bool ShouldManuallyDrawCompositionText() override { return true; }
+
+  void EnableIME() override;
+
+  void DisableIME() override;
+
+  void CompleteComposition() override;
+
+  void CancelComposition() override;
+
+  CompositionText GetCompositionText() override;
+
+  void SetCandidateWindowPosition(const Point& point) override;
+
+  IEvent<std::nullptr_t>* CompositionStartEvent() override;
+
+  IEvent<std::nullptr_t>* CompositionEndEvent() override;
+
+  IEvent<std::nullptr_t>* CompositionEvent() override;
+
+  IEvent<std::u16string_view>* TextEvent() override;
+
+ private:
+  void OnWindowNativeMessage(WindowNativeMessageEventArgs& args);
+
+  std::u16string GetResultString();
+
+  AutoHIMC GetHIMC();
+
+ private:
+  WinNativeWindow* native_window_;
+
+  EventRevokerListGuard event_guard_;
+
+  Event<std::nullptr_t> composition_start_event_;
+  Event<std::nullptr_t> composition_end_event_;
+  Event<std::nullptr_t> composition_event_;
+  Event<std::u16string_view> text_event_;
+};
+}  // namespace cru::platform::gui::win