From 13e0a5e9e89666caa5c82c87a1e728eef2efa65d Mon Sep 17 00:00:00 2001
From: ricardoofnl <raditiyaeltamricardo@outlook.de>
Date: Fri, 4 Sep 2026 22:16:53 +0700
Subject: [PATCH] [saco] Implement/match the four `CChatWindow` scrollbar
 pokes; `CDXUTScrollBar::GetTrackPos` comes along as the out-of-line COMDAT at
 `0x100670D0`

---
 saco/chatwindow.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++
 saco/chatwindow.h   |  8 ++++++++
 saco/cmdwindow.h    |  2 ++
 3 files changed, 57 insertions(+)

diff --git a/saco/chatwindow.cpp b/saco/chatwindow.cpp
index d2a50ca..a341a53 100644
--- a/saco/chatwindow.cpp
+++ b/saco/chatwindow.cpp
@@ -2,6 +2,8 @@
 #include "main.h"
 
 extern CConfig *pConfig;
+extern CCmdWindow *pCmdWindow;
+extern CGame *pGame;
 
 //----------------------------------------------------
 
@@ -199,3 +201,48 @@ void CChatWindow::ReplaceControlChars(char *szString)
 		while(*++szString);
 	}
 }
+
+//----------------------------------------------------
+
+void CChatWindow::PageUp()
+{
+	if(field_8 && m_pScrollBar && !pGame->sub_100A0920() && !pCmdWindow->IsImeActive()) {
+		int iPos = m_pScrollBar->GetTrackPos()-field_0;
+		if(iPos < 1) iPos = 1;
+		m_pScrollBar->SetTrackPos(iPos);
+	}
+}
+
+//----------------------------------------------------
+
+void CChatWindow::PageDown()
+{
+	if(field_8 && m_pScrollBar && !pGame->sub_100A0920() && !pCmdWindow->IsImeActive()) {
+		int iPos = m_pScrollBar->GetTrackPos();
+		if(iPos == 1)
+			iPos = field_0;
+		else
+			iPos += field_0;
+		if(iPos > MAX_MESSAGES) iPos = MAX_MESSAGES;
+		m_pScrollBar->SetTrackPos(iPos);
+	}
+}
+
+//----------------------------------------------------
+
+void CChatWindow::FUNC_10067390()
+{
+	if(m_pScrollBar)
+		m_pScrollBar->SetTrackPos(MAX_MESSAGES-10);
+}
+
+//----------------------------------------------------
+
+void CChatWindow::OnMouseWheel(int nDelta)
+{
+	if(field_8 && m_pScrollBar) {
+		int nScrollLines;
+		SystemParametersInfo(SPI_GETWHEELSCROLLLINES,0,&nScrollLines,0);
+		m_pScrollBar->Scroll(-(nDelta*nScrollLines));
+	}
+}
diff --git a/saco/chatwindow.h b/saco/chatwindow.h
index 9a9e12b..08e13b9 100644
--- a/saco/chatwindow.h
+++ b/saco/chatwindow.h
@@ -51,6 +51,14 @@ public:
 
 	void FUNC_10067200();
 
+	void FUNC_10067390(); // .text:10067390
+
+	void OnMouseWheel(int nDelta); // .text:100673C0
+
+	void PageUp(); // .text:100672D0
+
+	void PageDown(); // .text:10067330
+
 	void ReplaceControlChars(char *szString); // .text:10067420
 
 	void FUNC_10067E00(); // .text:10067E00
diff --git a/saco/cmdwindow.h b/saco/cmdwindow.h
index 9fb44b7..04ca822 100644
--- a/saco/cmdwindow.h
+++ b/saco/cmdwindow.h
@@ -35,6 +35,8 @@ public:
 
 	void GetDialogSize(RECT *pRect);
 
+	bool IsImeActive(); // .text:10069810
+
 	void Enable();
 	void Disable();