From 79482ea860bd3ac8ac547cbd959f23dc7515040d Mon Sep 17 00:00:00 2001
From: fallenoak <git@fallenoak.me>
Date: Sun, 30 Nov 2025 11:47:33 -0600
Subject: [PATCH] feat(ui): add CSimpleSlider::OnLayerTrackUpdate

---
 src/ui/CSimpleSlider.cpp | 23 +++++++++++++++++++++++
 src/ui/CSimpleSlider.hpp |  1 +
 2 files changed, 24 insertions(+)

diff --git a/src/ui/CSimpleSlider.cpp b/src/ui/CSimpleSlider.cpp
index 9364f1c..da999a9 100644
--- a/src/ui/CSimpleSlider.cpp
+++ b/src/ui/CSimpleSlider.cpp
@@ -133,6 +133,29 @@ void CSimpleSlider::OnLayerHide() {
     this->CSimpleFrame::OnLayerHide();
 }
 
+int32_t CSimpleSlider::OnLayerTrackUpdate(const CMouseEvent& evt) {
+    if (this->m_buttonDown && this->m_thumbTexture) {
+        auto thumbTexture = this->m_thumbTexture;
+
+        float area;
+        float offset;
+
+        if (this->m_orientation == SLIDER_VERTICAL) {
+            area = this->m_rect.maxY - this->m_rect.minY - thumbTexture->GetHeight();
+            offset = this->m_rect.maxY - (thumbTexture->GetHeight() / 2.0f) - evt.y;
+        } else {
+            area = this->m_rect.maxX - this->m_rect.minX - thumbTexture->GetWidth();
+            offset = evt.x - ((thumbTexture->GetWidth() / 2.0f) + this->m_rect.minX);
+        }
+
+        float value = (this->m_range + this->m_baseValue - this->m_baseValue) * (offset / area) + this->m_baseValue;
+
+        this->SetValue(value);
+    }
+
+    return this->CSimpleFrame::OnLayerTrackUpdate(evt);
+}
+
 void CSimpleSlider::OnLayerUpdate(float elapsedSec) {
     this->CSimpleFrame::OnLayerUpdate(elapsedSec);
 
diff --git a/src/ui/CSimpleSlider.hpp b/src/ui/CSimpleSlider.hpp
index de0d42d..ae91efe 100644
--- a/src/ui/CSimpleSlider.hpp
+++ b/src/ui/CSimpleSlider.hpp
@@ -35,6 +35,7 @@ class CSimpleSlider : public CSimpleFrame {
         virtual void LoadXML(XMLNode* node, CStatus* status);
         virtual void OnLayerHide();
         virtual void OnLayerUpdate(float elapsedSec);
+        virtual int32_t OnLayerTrackUpdate(const CMouseEvent& evt);
 
         // Member functions
         CSimpleSlider(CSimpleFrame* parent)