From 8a3c9a0b9d3bdf193b49f7f82378558c275948a6 Mon Sep 17 00:00:00 2001
From: Rye Mutt <rye@alchemyviewer.org>
Date: Mon, 22 Jul 2024 02:25:09 -0400
Subject: Introduce scroll wheel support to LLComboBox

---
 indra/llui/llcombobox.cpp | 14 ++++++++++++++
 indra/llui/llcombobox.h   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/indra/llui/llcombobox.cpp b/indra/llui/llcombobox.cpp
index 79dce1c714..ee1700e009 100644
--- a/indra/llui/llcombobox.cpp
+++ b/indra/llui/llcombobox.cpp
@@ -875,6 +875,20 @@ bool LLComboBox::handleUnicodeCharHere(llwchar uni_char)
     return result;
 }
 
+// virtual
+bool LLComboBox::handleScrollWheel(S32 x, S32 y, S32 clicks)
+{
+    if (mList->getVisible()) return mList->handleScrollWheel(x, y, clicks);
+    if (mAllowTextEntry) // We might be editable
+        if (!mList->getFirstSelected()) // We aren't in the list, don't kill their text
+            return false;
+
+    setCurrentByIndex(llclamp(getCurrentIndex() + clicks, 0, getItemCount() - 1));
+    prearrangeList();
+    onCommit();
+    return true;
+}
+
 void LLComboBox::setTextEntry(const LLStringExplicit& text)
 {
     if (mTextEntry)
diff --git a/indra/llui/llcombobox.h b/indra/llui/llcombobox.h
index cc1c2885fc..9dc6fa9257 100644
--- a/indra/llui/llcombobox.h
+++ b/indra/llui/llcombobox.h
@@ -114,6 +114,7 @@ public:
     virtual bool    handleToolTip(S32 x, S32 y, MASK mask);
     virtual bool    handleKeyHere(KEY key, MASK mask);
     virtual bool    handleUnicodeCharHere(llwchar uni_char);
+    virtual bool    handleScrollWheel(S32 x, S32 y, S32 clicks);
 
     // LLUICtrl interface
     virtual void    clear();                    // select nothing
-- 
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