From 5a145c119dbfb40d4105a4030151c5185ad67b8a Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Wed, 28 Oct 2026 23:49:39 +0000
Subject: [PATCH] Decompile 2 functions in
 Source/UI/Acceptance/UIChooseSellBuyWnd.cpp, Source/UI/Dialogs/UIMenuWnd.h,
 ...

Batch #1908 by ragnarok-clanker: 0 byte-identical, 2 confirmed by peer review.

- fn_12289 UIMenuWnd::Slot28: logic confirmed by peer review
- fn_12309 UIEquipWnd::Slot35: logic confirmed by peer review

Peer-reviewed-by: eAthena, Yommy
Reviewed-by: ragnarok-clanker
---
 Source/Client/Session.h                     |  4 ++-
 Source/UI/Acceptance/UIChooseSellBuyWnd.cpp | 32 +++++++++++++++++++++
 Source/UI/Dialogs/UIMenuWnd.h               | 11 +++++++
 Source/UI/Items/UIEquipWnd.h                |  5 +++-
 4 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/Source/Client/Session.h b/Source/Client/Session.h
index edac7d9..9f0221c 100644
--- a/Source/Client/Session.h
+++ b/Source/Client/Session.h
@@ -194,7 +194,9 @@ public:
   /* 807C */ unsigned char unknown_807C[0x38];
   /* 80B4 */ std::map<std::string, int> m_nameToId;
   /* 80BC */ std::map<int, SessionShop> m_shops;
-  /* 80C4 */ unsigned char unknown_80C4[0x58];
+  /* 80C4 */ unsigned char unknown_80C4[4];
+  /* 80C8 */ int unknown_80C8;
+  /* 80CC */ unsigned char unknown_80CC[0x50];
   /* 811C */ std::vector<ItemInfo> m_cardItems;
   /* 8128 */ unsigned char unknown_8128[0x0C];
   /* 8134 */ int unknown_8134;
diff --git a/Source/UI/Acceptance/UIChooseSellBuyWnd.cpp b/Source/UI/Acceptance/UIChooseSellBuyWnd.cpp
index 348473f..ab650c1 100644
--- a/Source/UI/Acceptance/UIChooseSellBuyWnd.cpp
+++ b/Source/UI/Acceptance/UIChooseSellBuyWnd.cpp
@@ -1,4 +1,5 @@
 #include "Client/Application/ApplicationWindow.h"
+#include "Client/Session.h"
 #include "Contents/Configuration/ServiceConfiguration.h"
 #include "Client/Mode/ActiveGameMode.h"
 #include "Client/Mode/CGameMode.h"
@@ -587,6 +588,29 @@ void UIMenuWnd::Slot27(int x, int y) {
   this->Slot28(x, y);
 }
 
+// OFFSET: 0x008F4680
+// FUNCTION: fn_12289
+void UIMenuWnd::Slot28(int x, int y) {
+  const int previous = this->m_selected;
+  this->m_selected = this->ItemAt(x, y);
+  if (previous != this->m_selected) {
+    this->Invalidate();
+  }
+}
+
+// OFFSET: 0x008D99D0
+// FUNCTION: fn_12134
+int UIMenuWnd::ItemAt(int x, int y) {
+  if (x < 0 || x >= this->geometry.width || y < 0 || y >= this->geometry.height) {
+    return -1;
+  }
+
+  int row = y / (this->m_itemHeight / 2);
+  const unsigned index = row < 0 ? 0 : row;
+  const unsigned last = static_cast<unsigned>(this->m_items.size()) - 1;
+  return index <= last ? index : last;
+}
+
 // OFFSET: 0x008F4D40
 // FUNCTION: fn_12294
 void UIEquipWnd::Slot19() {
@@ -649,6 +673,14 @@ void UIExchangeWnd::Slot35(int delta) {
   this->SendMsg(this->m_scrollBar, 7, delta < 0 ? 1 : -1, 0, 0, 0);
 }
 
+// OFFSET: 0x008F59C0
+// FUNCTION: fn_12309
+void UIEquipWnd::Slot35(int delta) {
+  if (g_session.unknown_80C8 > 4 && this->m_page == 3) {
+    this->SendMsg(this->m_scrollBar, 8, delta < 0 ? 1 : -1, 0, 0, 0);
+  }
+}
+
 // OFFSET: 0x008F5A50
 // FUNCTION: fn_12311
 void UIItemIdentifyWnd::Slot35(int delta) {
diff --git a/Source/UI/Dialogs/UIMenuWnd.h b/Source/UI/Dialogs/UIMenuWnd.h
index d6dfc08..11903ac 100644
--- a/Source/UI/Dialogs/UIMenuWnd.h
+++ b/Source/UI/Dialogs/UIMenuWnd.h
@@ -3,9 +3,20 @@
 
 #include "UI/Window/UIFrameWnd.h"
 
+#include <string>
+#include <vector>
+
 class UIMenuWnd : public UIFrameWnd {
 public:
+  /* 00B4 */ int m_menuId;
+  /* 00B8 */ int m_selected;
+  /* 00BC */ int m_itemHeight;
+  /* 00C0 */ std::vector<std::string> m_items;
+
   void Slot27(int x, int y) override;
+  void Slot28(int x, int y) override;
+
+  int ItemAt(int x, int y);
 };
 
 #endif
diff --git a/Source/UI/Items/UIEquipWnd.h b/Source/UI/Items/UIEquipWnd.h
index 3b3b8bf..ed44540 100644
--- a/Source/UI/Items/UIEquipWnd.h
+++ b/Source/UI/Items/UIEquipWnd.h
@@ -7,13 +7,16 @@ class UIEquipWnd : public UIFrameWnd {
 public:
   /* 00B4 */ unsigned char unknown_00B4[0x3C];
   /* 00F0 */ int m_page;
-  /* 00F4 */ unsigned char unknown_00F4[0x60];
+  /* 00F4 */ unsigned char unknown_00F4[0x40];
+  /* 0134 */ UIWindow* m_scrollBar;
+  /* 0138 */ unsigned char unknown_0138[0x1C];
   /* 0154 */ int m_firstSlot;
   /* 0158 */ int m_hoverSlot;
 
   void Slot19() override;
   void Slot27(int x, int y) override;
   void Slot31(int x, int y) override;
+  void Slot35(int delta) override;
 };
 
 #endif