From 7d20efa165289db22c7ff620f1c59f422a025820 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Sat, 29 Nov 2025 23:03:02 +0800
Subject: Impl sdl input method context.

---
 include/cru/platform/gui/sdl/InputMethod.h | 42 ++++++++++++++++++++++++++++++
 include/cru/platform/gui/sdl/Window.h      |  7 +++--
 2 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 include/cru/platform/gui/sdl/InputMethod.h

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

diff --git a/include/cru/platform/gui/sdl/InputMethod.h b/include/cru/platform/gui/sdl/InputMethod.h
new file mode 100644
index 00000000..77a78999
--- /dev/null
+++ b/include/cru/platform/gui/sdl/InputMethod.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "Base.h"
+
+#include <cru/platform/gui/InputMethod.h>
+
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_video.h>
+
+namespace cru::platform::gui::sdl {
+class SdlWindow;
+
+class SdlInputMethodContext : public SdlResource,
+                              public virtual IInputMethodContext {
+  friend SdlWindow;
+
+ public:
+  explicit SdlInputMethodContext(SdlWindow* window);
+
+  bool ShouldManuallyDrawCompositionText() override;
+  void EnableIME() override;
+  void DisableIME() override;
+
+  /**
+   * Note: SDL doesn't support this. So it actually calls CancelComposition().
+   */
+  void CompleteComposition() override;
+  void CancelComposition() override;
+
+  CompositionText GetCompositionText() override;
+
+  void SetCandidateWindowPosition(const Point& point) override;
+
+  CRU_DEFINE_CRU_PLATFORM_GUI_I_INPUT_METHOD_OVERRIDE_EVENTS()
+
+ private:
+  bool HandleEvent(const SDL_Event* event);
+
+ private:
+  SdlWindow* window_;
+};
+}  // namespace cru::platform::gui::sdl
diff --git a/include/cru/platform/gui/sdl/Window.h b/include/cru/platform/gui/sdl/Window.h
index 58dd9785..aaa0c725 100644
--- a/include/cru/platform/gui/sdl/Window.h
+++ b/include/cru/platform/gui/sdl/Window.h
@@ -6,10 +6,10 @@
 
 #include <SDL3/SDL_events.h>
 #include <SDL3/SDL_video.h>
-#include <optional>
 
 namespace cru::platform::gui::sdl {
 class SdlUiApplication;
+class SdlInputMethodContext;
 
 class SdlWindow : public SdlResource, public virtual INativeWindow {
   CRU_DEFINE_CLASS_LOG_TAG("cru::platform::gui::xcb::SdlWindow")
@@ -79,7 +79,8 @@ class SdlWindow : public SdlResource, public virtual INativeWindow {
   IInputMethodContext* GetInputMethodContext() override;
 
  public:
-  std::optional<SDL_Window*> GetSdlWindow();
+  SDL_Window* GetSdlWindow();
+  SDL_WindowID GetSdlWindowId();
   SdlUiApplication* GetSdlUiApplication();
   float GetDisplayScale();
   Thickness GetBorderThickness();
@@ -104,5 +105,7 @@ class SdlWindow : public SdlResource, public virtual INativeWindow {
   WindowStyleFlag style_;
   std::string title_;
   std::shared_ptr<ICursor> cursor_;
+
+  std::unique_ptr<SdlInputMethodContext> input_context_;
 };
 }  // namespace cru::platform::gui::sdl
-- 
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