From 65eb389b7b8c8125d3342a2b78ffbd68139e80d5 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Wed, 28 Oct 2026 20:12:41 +0000
Subject: [PATCH] Decompile 6 functions in Source/UI/Window/InputFocus.cpp,
 Source/UI/Window/InputFocus.h, ...

Batch #1689 by ragnarok-clanker: 0 byte-identical, 6 confirmed by peer review.

- fn_17197 InputFocus::IsLast: logic confirmed by peer review
- fn_17260 InputFocus::Previous: logic confirmed by peer review
- fn_16960 UIWindow::NextFocusable: logic confirmed by peer review
- fn_16969 UIWindow::PreviousFocusable: logic confirmed by peer review
- fn_10911 UIEditCtrl2::SendMsg: logic confirmed by peer review
- fn_10913 UIEditCtrl5::SendMsg: logic confirmed by peer review

Peer-reviewed-by: eAthena
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 Source/UI/Edit/UIEditVariants.cpp | 16 ++++++++--
 Source/UI/Window/InputFocus.cpp   | 32 ++++++++++----------
 Source/UI/Window/InputFocus.h     |  3 +-
 Source/UI/Window/UIWindow.cpp     | 50 +++++++++++++++++++++++++++++++
 Source/UI/Window/UIWindow.h       |  2 ++
 5 files changed, 84 insertions(+), 19 deletions(-)

diff --git a/Source/UI/Edit/UIEditVariants.cpp b/Source/UI/Edit/UIEditVariants.cpp
index 322170c..fbca819 100644
--- a/Source/UI/Edit/UIEditVariants.cpp
+++ b/Source/UI/Edit/UIEditVariants.cpp
@@ -16,7 +16,13 @@ int UIEditCtrl2::SendMsg(UIWindow* sender, int message, std::intptr_t a, std::in
   if (message != 0) {
     this->UIEditCtrl::SendMsg(sender, message, a, b, c, d);
   } else {
-    this->m_edit->focus.Advance();
+    InputFocus& focus = this->m_edit->focus;
+    if (focus.IsLast(focus.window)) {
+      focus.First();
+    } else {
+      focus.Next();
+    }
+
     this->UIWindow::SendMsg(sender, message, a, b, c, d);
   }
 
@@ -62,7 +68,13 @@ int UIEditCtrl5::SendMsg(UIWindow* sender, int message, std::intptr_t a, std::in
   if (message != 0) {
     this->UIEditCtrl::SendMsg(sender, message, a, b, c, d);
   } else {
-    this->m_edit->focus.Advance();
+    InputFocus& focus = this->m_edit->focus;
+    if (focus.IsLast(focus.window)) {
+      focus.First();
+    } else {
+      focus.Next();
+    }
+
     this->UIWindow::SendMsg(sender, message, a, b, c, d);
   }
 
diff --git a/Source/UI/Window/InputFocus.cpp b/Source/UI/Window/InputFocus.cpp
index 790a007..6b2af2f 100644
--- a/Source/UI/Window/InputFocus.cpp
+++ b/Source/UI/Window/InputFocus.cpp
@@ -100,28 +100,28 @@ void InputFocus::Next() {
   this->window = nullptr;
 }
 
-// INLINED
-void InputFocus::Advance() {
+// OFFSET: 0x00A96F60
+// FUNCTION: fn_17197
+bool InputFocus::IsLast(UIWindow* value) {
+  return value && value->parent->NextFocusable(value) == nullptr;
+}
+
+// OFFSET: 0x00AA9DC0
+// FUNCTION: fn_17260
+void InputFocus::Previous() {
   if (!this->window) {
-    this->Next();
     return;
   }
 
-  UIWindow* parent = this->window->parent;
-  bool found = false;
-
-  for (UIWindow* child : parent->m_children) {
-    if (found && child->Slot05()) {
-      this->Next();
-      return;
-    }
-
-    if (child == this->window && child->Slot05()) {
-      found = true;
-    }
+  UIWindow* previous = this->window->parent->PreviousFocusable(this->window);
+  if (!previous) {
+    this->Set(nullptr);
+    return;
   }
 
-  this->First();
+  if (previous->Slot05()) {
+    this->Set(previous);
+  }
 }
 
 // INLINED
diff --git a/Source/UI/Window/InputFocus.h b/Source/UI/Window/InputFocus.h
index d22dab6..5a7c304 100644
--- a/Source/UI/Window/InputFocus.h
+++ b/Source/UI/Window/InputFocus.h
@@ -9,7 +9,8 @@ struct InputFocus {
   void First();
   void Last();
   void Next();
-  void Advance();
+  bool IsLast(UIWindow* value);
+  void Previous();
 
   void Refresh(UIWindow* const& excludedRoot);
 };
diff --git a/Source/UI/Window/UIWindow.cpp b/Source/UI/Window/UIWindow.cpp
index a5d710d..2fea154 100644
--- a/Source/UI/Window/UIWindow.cpp
+++ b/Source/UI/Window/UIWindow.cpp
@@ -575,6 +575,56 @@ UIWindow* UIWindow::Root() {
   return root;
 }
 
+// OFFSET: 0x00A7ED50
+// FUNCTION: fn_16960
+UIWindow* UIWindow::NextFocusable(UIWindow* child) {
+  auto it = this->m_children.begin();
+
+  for (; it != this->m_children.end(); ++it) {
+    if (*it == child && child->Slot05()) {
+      break;
+    }
+  }
+
+  if (it == this->m_children.end()) {
+    return nullptr;
+  }
+
+  for (++it; it != this->m_children.end(); ++it) {
+    if ((*it)->Slot05()) {
+      return *it;
+    }
+  }
+
+  return nullptr;
+}
+
+// OFFSET: 0x00A7FF30
+// FUNCTION: fn_16969
+UIWindow* UIWindow::PreviousFocusable(UIWindow* child) {
+  auto it = this->m_children.end();
+
+  for (; it != this->m_children.begin(); --it) {
+    UIWindow* window = *std::prev(it);
+    if (window == child && window->Slot05()) {
+      break;
+    }
+  }
+
+  if (it == this->m_children.begin()) {
+    return nullptr;
+  }
+
+  for (--it; it != this->m_children.begin(); --it) {
+    UIWindow* window = *std::prev(it);
+    if (window->Slot05()) {
+      return window;
+    }
+  }
+
+  return nullptr;
+}
+
 // OFFSET: 0x00A82DD0
 // FUNCTION: fn_16995
 void UIWindow::DeleteChildren() {
diff --git a/Source/UI/Window/UIWindow.h b/Source/UI/Window/UIWindow.h
index dea9b2c..6ba1c97 100644
--- a/Source/UI/Window/UIWindow.h
+++ b/Source/UI/Window/UIWindow.h
@@ -117,6 +117,8 @@ public:
     return this->m_uid;
   }
   UIWindow* Root();
+  UIWindow* NextFocusable(UIWindow* child);
+  UIWindow* PreviousFocusable(UIWindow* child);
   void ClearSurface(std::uint32_t color);
   void SetSize(int width, int height);
   void DrawBitmap(int x, int y, const BitmapImage* image, bool transparent);