From b295776576ff7a4fc848dddfe23fdbaa8bcaccc2 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Sat, 31 Oct 2026 10:16:42 +0000
Subject: [PATCH] Decompile fn_13416 (UISkillListWnd::UpdateScrollBar)

Batch #7551 by eAthena: 0 byte-identical, 1 confirmed by peer review.

- fn_13416 UISkillListWnd::UpdateScrollBar: logic confirmed by peer review

Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 Source/UI/Edit/UIEditCtrl.cpp      | 51 ++++++++++++++++++++++++++++++
 Source/UI/Item/UIItemStoreSubWnd.h |  4 +++
 Source/UI/Shop/UIMerchantItemWnd.h |  1 +
 Source/UI/Skill/UISkillListWnd.h   |  6 +++-
 4 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/Source/UI/Edit/UIEditCtrl.cpp b/Source/UI/Edit/UIEditCtrl.cpp
index ca4bb78b..7b3d56a9 100644
--- a/Source/UI/Edit/UIEditCtrl.cpp
+++ b/Source/UI/Edit/UIEditCtrl.cpp
@@ -995,6 +995,8 @@ void UIItemStoreFindWnd::Slot10(int x, int y, std::intptr_t value) {
   g_modeMgr.GetGameMode()->SendMsg(18, 0, 0, 0, 0);
 }
 
+// OFFSET: 0x00972570
+
 // OFFSET: 0x009727F0
 // FUNCTION: fn_13275
 void UIItemWnd::Slot10(int x, int y, std::intptr_t value) {
@@ -2217,6 +2219,12 @@ bool UIItemStoreSubWnd::Sort3() {
   return true;
 }
 
+// OFFSET: 0x00995CF0
+
+// OFFSET: 0x00995D50
+
+// OFFSET: 0x00995DB0
+
 // OFFSET: 0x00996940
 // FUNCTION: fn_13473
 void UIItemStoreSubWnd::SetTabIndex(int index) {
@@ -2498,6 +2506,8 @@ void UIMerchantItemShopWnd::Slot10(int x, int y, std::intptr_t value) {
   g_windowMgr.window_01EC->SendMsg(nullptr, 13, 11, 0, 0, 0);
 }
 
+// OFFSET: 0x00972C00
+
 // OFFSET: 0x0089CAE0
 // FUNCTION: fn_11591
 void UIEditCtrl_Custom::Trim() {
@@ -2867,6 +2877,47 @@ void UIItemBaseWnd::Slot35(int value) {
   }
 }
 
+// OFFSET: 0x0098A3A0
+
+// OFFSET: 0x0098A6F0
+// FUNCTION: fn_13416
+void UISkillListWnd::UpdateScrollBar() {
+  UIScrollBar* bar = static_cast<UIScrollBar*>(this->scrollBar);
+  if (!bar) {
+    return;
+  }
+
+  const int visible = this->visibleRows;
+  const int rows = (this->skills.size() % this->columns != 0) + this->skills.size() / this->columns;
+  int overflow = rows - visible;
+  if (overflow < 0) {
+    overflow = 0;
+  }
+
+  this->unknown_0128 = overflow != 0;
+  if (overflow != 0) {
+    bar->SetRange(overflow, visible, rows);
+    int position = this->scroll;
+    if (position < 0) {
+      this->scroll = 0;
+      position = 0;
+    }
+
+    const int last = rows - this->visibleRows;
+    if (position > last) {
+      this->scroll = last;
+      position = last;
+    }
+
+    static_cast<UIScrollBar*>(this->scrollBar)->SetPosition(position);
+  } else {
+    this->scroll = 0;
+    bar->SetRange(0, visible, rows);
+  }
+
+  this->scrollBar->Invalidate();
+}
+
 // OFFSET: 0x0098A2B0
 // FUNCTION: fn_13410
 void UIItemStoreFindWnd::Slot35(int value) {
diff --git a/Source/UI/Item/UIItemStoreSubWnd.h b/Source/UI/Item/UIItemStoreSubWnd.h
index 1bf3752c..5bbe1cf4 100644
--- a/Source/UI/Item/UIItemStoreSubWnd.h
+++ b/Source/UI/Item/UIItemStoreSubWnd.h
@@ -10,6 +10,7 @@ class UIItemStoreSubWnd : public UIItemBaseWnd {
 public:
   void Slot28(int x, int y) override;
   void Slot32(int x, int y) override;
+  void Slot10(int x, int y, std::intptr_t value) override;
   void Slot11() override;
   void Slot25(int x, int y) override;
   void Slot26(int x, int y) override;
@@ -20,6 +21,9 @@ public:
   bool Sort1();
   bool Sort2();
   bool Sort3();
+  bool SortReversed1();
+  bool SortReversed2();
+  bool SortReversed3();
   bool sub_996950();
   bool sub_996AF0();
   bool sub_996C90();
diff --git a/Source/UI/Shop/UIMerchantItemWnd.h b/Source/UI/Shop/UIMerchantItemWnd.h
index 9a1cbc07..54567b54 100644
--- a/Source/UI/Shop/UIMerchantItemWnd.h
+++ b/Source/UI/Shop/UIMerchantItemWnd.h
@@ -8,6 +8,7 @@
 
 class UIMerchantItemWnd : public UIItemBaseWnd {
 public:
+  void Slot10(int x, int y, std::intptr_t value) override;
   void Slot11() override;
   void Paint() override;
   void Slot28(int x, int y) override;
diff --git a/Source/UI/Skill/UISkillListWnd.h b/Source/UI/Skill/UISkillListWnd.h
index 13454990..e5df2568 100644
--- a/Source/UI/Skill/UISkillListWnd.h
+++ b/Source/UI/Skill/UISkillListWnd.h
@@ -15,13 +15,17 @@ public:
   void Slot26(int x, int y) override;
   void Slot32(int x, int y) override;
   void Slot33(int x, int y) override;
+  void Slot35(int value) override;
 
   __declspec(noinline) int SkillAt(int x, int y);
   __declspec(noinline) CSkillInfo GetSkillByIndex(int index);
   CSkillInfo GetSkillAt(int x, int y);
   CSkillInfo GetVisibleSkill(int row);
+  void UpdateScrollBar();
 
-  /* 00BC */ unsigned char unknown_00BC[0x5C];
+  /* 00B4 */ int unknown_00B4;
+  /* 00B8 */ UIWindow* scrollBar;
+  /* 00BC */ unsigned char unknown_00BC[0x54];
   /* 0118 */ int hovered;
   /* 011C */ int scroll;
   /* 0120 */ int columns;