From 6d8a82c6188af8615845b9408101b5da02ef763b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Toma=C5=BE=20V=C3=B6r=C3=B6=C5=A1?= <tomaz.voros@gmail.com>
Date: Fri, 27 Jan 2023 20:00:05 +0100
Subject: [PATCH] Add switch for vertical centering on/off at run-time.

---
 server/TracyView.hpp          | 1 +
 server/TracyView_Options.cpp  | 3 +++
 server/TracyView_Timeline.cpp | 8 +++++++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/server/TracyView.hpp b/server/TracyView.hpp
index 479c6530a4..6993dbec65 100644
--- a/server/TracyView.hpp
+++ b/server/TracyView.hpp
@@ -407,6 +407,7 @@ class View
     std::string m_filename, m_filenameStaging;
     bool m_staticView;
     ViewMode m_viewMode;
+    bool m_verticallyCenterTimeline = false;
     bool m_viewModeHeuristicTry = false;
     DecayValue<bool> m_forceConnectionPopup = false;
     uint64_t m_totalMemory;
diff --git a/server/TracyView_Options.cpp b/server/TracyView_Options.cpp
index 726d567e63..9ee55d3d96 100644
--- a/server/TracyView_Options.cpp
+++ b/server/TracyView_Options.cpp
@@ -52,6 +52,9 @@ void View::DrawOptions()
     SmallColorBox( 0xFFDD9900 );
     ImGui::PopFont();
     ImGui::Unindent();
+    val = m_verticallyCenterTimeline;
+    ImGui::Checkbox( "Vertically center timeline", &val );
+    m_verticallyCenterTimeline = val;
     if( m_worker.HasContextSwitches() )
     {
         ImGui::Separator();
diff --git a/server/TracyView_Timeline.cpp b/server/TracyView_Timeline.cpp
index 0b88fdd068..e4174c9ef4 100644
--- a/server/TracyView_Timeline.cpp
+++ b/server/TracyView_Timeline.cpp
@@ -327,6 +327,11 @@ void View::DrawTimeline()
     if( m_yDelta != 0 )
     {
         auto& io = ImGui::GetIO();
+        if( !m_verticallyCenterTimeline )
+        {
+            auto y = ImGui::GetScrollY();
+            ImGui::SetScrollY( y - m_yDelta );
+        }
         io.MouseClickedPos[1].y = io.MousePos.y;
     }
 
@@ -378,7 +383,8 @@ void View::DrawTimeline()
         }
     }
 
-    m_tc.End( pxns, wpos, hover, drawMouseLine && m_viewMode == ViewMode::Paused, yMin, yMax );
+    const auto vcenter = m_verticallyCenterTimeline && drawMouseLine && m_viewMode == ViewMode::Paused;
+    m_tc.End( pxns, wpos, hover, vcenter, yMin, yMax );
     ImGui::EndChild();
 
     m_lockHighlight = m_nextLockHighlight;