From 79669b5a9451b4ed6b61a565e69ed919e784104f Mon Sep 17 00:00:00 2001
From: y5nw <37980625+y5nw@users.noreply.github.com>
Date: Sun, 25 May 2025 16:30:53 +0200
Subject: [PATCH 1/2] partial

---
 irr/include/IEventReceiver.h | 21 +++++++++++++++++++++
 irr/src/CIrrDeviceSDL.cpp    | 14 +++++++++++++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/irr/include/IEventReceiver.h b/irr/include/IEventReceiver.h
index 332b23158..d644911ee 100644
--- a/irr/include/IEventReceiver.h
+++ b/irr/include/IEventReceiver.h
@@ -37,6 +37,13 @@ enum EEVENT_TYPE
 	/** This event is created when multiple characters are sent at a time (e.g. using an IME). */
 	EET_STRING_INPUT_EVENT,
 
+	//! A string composition event.
+	/** This event is created when the user "composes" characters (e.g. using an IME) before entering
+	the complete text.
+	See https://wiki.libsdl.org/SDL2/SDL_TextEditingExtEvent
+	*/
+	EET_STRING_COMPOSITION_EVENT,
+
 	//! A touch input event.
 	EET_TOUCH_INPUT_EVENT,
 
@@ -382,6 +389,19 @@ struct SEvent
 		core::stringw *Str;
 	};
 
+	//! String composition event.
+	struct SStringComposition
+	{
+		//! The string that is composed.
+		core::stringw *Str;
+
+		//! The position within the composition where further text would be inserted.
+		s32 Start;
+
+		//! The number of characters that would be replaced by further typing.
+		s32 Length;
+	};
+
 	//! Any kind of touch event.
 	struct STouchInput
 	{
@@ -532,6 +552,7 @@ struct SEvent
 		struct SMouseInput MouseInput;
 		struct SKeyInput KeyInput;
 		struct SStringInput StringInput;
+		struct SStringComposition StringComposition;
 		struct STouchInput TouchInput;
 		struct SAccelerometerEvent AccelerometerEvent;
 		struct SGyroscopeEvent GyroscopeEvent;
diff --git a/irr/src/CIrrDeviceSDL.cpp b/irr/src/CIrrDeviceSDL.cpp
index bc7627f73..2b8893541 100644
--- a/irr/src/CIrrDeviceSDL.cpp
+++ b/irr/src/CIrrDeviceSDL.cpp
@@ -340,7 +340,7 @@ CIrrDeviceSDL::CIrrDeviceSDL(const SIrrlichtCreationParameters &param) :
 #endif
 
 		// Set IME hints
-		SDL_SetHint(SDL_HINT_IME_INTERNAL_EDITING, "1");
+		SDL_SetHint(SDL_HINT_IME_INTERNAL_EDITING, "0");
 #if defined(SDL_HINT_IME_SHOW_UI)
 		SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
 #endif
@@ -885,6 +885,18 @@ bool CIrrDeviceSDL::run()
 			irrevent.StringInput.Str = NULL;
 		} break;
 
+		case SDL_TEXTEDITING: {
+			irrevent.EventType = irr::EET_STRING_COMPOSITION_EVENT;
+			irrevent.StringComposition.Str = new core::stringw();
+			irr::core::utf8ToWString(*irrevent.StringInput.Str, SDL_event.edit.text);
+			irrevent.StringComposition.Start = SDL_event.edit.start;
+			irrevent.StringComposition.Length = SDL_event.edit.length;
+			postEventFromUser(irrevent);
+			delete irrevent.StringInput.Str;
+			irrevent.StringInput.Str = NULL;
+			break;
+		}
+
 		case SDL_KEYDOWN:
 		case SDL_KEYUP: {
 			auto keysym = SDL_event.key.keysym.sym;

From f4e6c2b62fcba53683d1c0f2d7be5d5be761353d Mon Sep 17 00:00:00 2001
From: y5nw <37980625+y5nw@users.noreply.github.com>
Date: Sun, 25 May 2025 17:00:03 +0200
Subject: [PATCH 2/2] Implement string composition for CGUIEditBox

---
 irr/src/CGUIEditBox.cpp     | 26 ++++++++++++++++++++++++--
 irr/src/CGUIEditBox.h       |  4 ++++
 irr/src/CGUIEnvironment.cpp |  1 +
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/irr/src/CGUIEditBox.cpp b/irr/src/CGUIEditBox.cpp
index 6c29e89a9..50f6a449a 100644
--- a/irr/src/CGUIEditBox.cpp
+++ b/irr/src/CGUIEditBox.cpp
@@ -234,6 +234,10 @@ bool CGUIEditBox::OnEvent(const SEvent &event)
 			inputString(*event.StringInput.Str);
 			return true;
 			break;
+		case EET_STRING_COMPOSITION_EVENT:
+			composeString(*event.StringComposition.Str);
+			return true;
+			break;
 		default:
 			break;
 		}
@@ -1262,10 +1266,10 @@ void CGUIEditBox::inputChar(wchar_t c)
 	inputString(s);
 }
 
-void CGUIEditBox::inputString(const core::stringw &str)
+bool CGUIEditBox::insertString(const core::stringw &str)
 {
 	if (!isEnabled())
-		return;
+		return false;
 
 	core::stringw s;
 	u32 len = str.size();
@@ -1324,6 +1328,13 @@ void CGUIEditBox::inputString(const core::stringw &str)
 	}
 
 	BlinkStartTime = os::Timer::getTime();
+	return true;
+}
+
+void CGUIEditBox::inputString(const core::stringw &str)
+{
+	if (!insertString(str))
+		return;
 	setTextMarkers(0, 0);
 
 	breakText();
@@ -1331,6 +1342,17 @@ void CGUIEditBox::inputString(const core::stringw &str)
 	sendGuiEvent(EGET_EDITBOX_CHANGED);
 }
 
+void CGUIEditBox::composeString(const core::stringw &str)
+{
+	if (!insertString(str))
+		return;
+	setTextMarkers(CursorPos-str.size(), CursorPos);
+
+	breakText();
+	calculateScrollPos();
+	sendGuiEvent(EGET_EDITBOX_CHANGED);
+}
+
 // calculate autoscroll
 void CGUIEditBox::calculateScrollPos()
 {
diff --git a/irr/src/CGUIEditBox.h b/irr/src/CGUIEditBox.h
index 35ab5f73e..97fa809de 100644
--- a/irr/src/CGUIEditBox.h
+++ b/irr/src/CGUIEditBox.h
@@ -144,10 +144,14 @@ protected:
 	void setTextRect(s32 line);
 	//! returns the line number that the cursor is on
 	s32 getLineFromPos(s32 pos);
+	//! inserts a string to the edit box; used by inputString and composeString
+	bool insertString(const core::stringw &str);
 	//! adds a letter to the edit box
 	void inputChar(wchar_t c);
 	//! adds a string to the edit box
 	void inputString(const core::stringw &str);
+	//! compose a string before it is added
+	void composeString(const core::stringw &str);
 	//! calculates the current scroll position
 	void calculateScrollPos();
 	//! calculated the FrameRect
diff --git a/irr/src/CGUIEnvironment.cpp b/irr/src/CGUIEnvironment.cpp
index abfa0aab9..b443c9a3b 100644
--- a/irr/src/CGUIEnvironment.cpp
+++ b/irr/src/CGUIEnvironment.cpp
@@ -552,6 +552,7 @@ bool CGUIEnvironment::postEventFromUser(const SEvent &event)
 			}
 		}
 	} break;
+	case EET_STRING_COMPOSITION_EVENT: [[fallthrough]];
 	case EET_STRING_INPUT_EVENT:
 		if (Focus && Focus->OnEvent(event))
 			return true;