From d53e766d6595d8cdd74f1f8316c82f7fa9e7bb3e Mon Sep 17 00:00:00 2001
From: TryTwo <taolas@gmail.com>
Date: Wed, 9 Jul 2025 23:00:00 -0700
Subject: [PATCH] CodeWidget: Add button that prevents automatic updates to the
 address, such as navigating to the PC on pause.

---
 Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp | 11 +++++++++--
 Source/Core/DolphinQt/Debugger/CodeViewWidget.h   |  2 ++
 Source/Core/DolphinQt/Debugger/CodeWidget.cpp     | 13 ++++++++++++-
 Source/Core/DolphinQt/Debugger/CodeWidget.h       |  2 ++
 4 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp b/Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp
index e555054938..a430be15a3 100644
--- a/Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp
+++ b/Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp
@@ -181,11 +181,13 @@ CodeViewWidget::CodeViewWidget()
           &CodeViewWidget::OnDebugFontChanged);
 
   connect(&Settings::Instance(), &Settings::EmulationStateChanged, this, [this] {
-    m_address = m_system.GetPPCState().pc;
+    if (!m_lock_address && Core::GetState(m_system) == Core::State::Paused)
+      m_address = m_system.GetPPCState().pc;
     Update();
   });
   connect(Host::GetInstance(), &Host::UpdateDisasmDialog, this, [this] {
-    m_address = m_system.GetPPCState().pc;
+    if (!m_lock_address && Core::GetState(m_system) == Core::State::Paused)
+      m_address = m_system.GetPPCState().pc;
     Update();
   });
   connect(Host::GetInstance(), &Host::PPCSymbolsChanged, this,
@@ -538,6 +540,11 @@ u32 CodeViewWidget::GetAddress() const
   return m_address;
 }
 
+void CodeViewWidget::OnLockAddress(bool lock)
+{
+  m_lock_address = lock;
+}
+
 void CodeViewWidget::SetAddress(u32 address, SetAddressUpdate update)
 {
   if (m_address == address)
diff --git a/Source/Core/DolphinQt/Debugger/CodeViewWidget.h b/Source/Core/DolphinQt/Debugger/CodeViewWidget.h
index 6760c082eb..d1eeef49ef 100644
--- a/Source/Core/DolphinQt/Debugger/CodeViewWidget.h
+++ b/Source/Core/DolphinQt/Debugger/CodeViewWidget.h
@@ -41,6 +41,7 @@ public:
   ~CodeViewWidget() override;
 
   u32 GetAddress() const;
+  void OnLockAddress(bool lock);
   u32 GetContextAddress() const;
   void SetAddress(u32 address, SetAddressUpdate update);
 
@@ -111,6 +112,7 @@ private:
   bool m_updating = false;
 
   u32 m_address = 0;
+  bool m_lock_address = false;
   u32 m_context_address = 0;
 
   std::vector<CodeViewBranch> m_branches;
diff --git a/Source/Core/DolphinQt/Debugger/CodeWidget.cpp b/Source/Core/DolphinQt/Debugger/CodeWidget.cpp
index 002ea47570..e5aaa1c2cd 100644
--- a/Source/Core/DolphinQt/Debugger/CodeWidget.cpp
+++ b/Source/Core/DolphinQt/Debugger/CodeWidget.cpp
@@ -18,6 +18,7 @@
 #include <QStyleHints>
 #include <QTabWidget>
 #include <QTableWidget>
+#include <QToolButton>
 #include <QVBoxLayout>
 #include <QWidget>
 
@@ -31,6 +32,7 @@
 #include "Core/System.h"
 #include "DolphinQt/Debugger/BranchWatchDialog.h"
 #include "DolphinQt/Host.h"
+#include "DolphinQt/Resources.h"
 #include "DolphinQt/Settings.h"
 
 static const QString BOX_SPLITTER_STYLESHEET = QStringLiteral(
@@ -61,7 +63,7 @@ CodeWidget::CodeWidget(QWidget* parent)
           [this](bool visible) { setHidden(!visible); });
 
   connect(Host::GetInstance(), &Host::UpdateDisasmDialog, this, [this] {
-    if (Core::GetState(m_system) == Core::State::Paused)
+    if (!m_lock_btn->isChecked() && Core::GetState(m_system) == Core::State::Paused)
       SetAddress(m_system.GetPPCState().pc, CodeViewWidget::SetAddressUpdate::WithoutUpdate);
     Update();
   });
@@ -109,8 +111,16 @@ void CodeWidget::CreateWidgets()
   auto* top_layout = new QHBoxLayout;
   m_search_address = new QLineEdit;
   m_search_address->setPlaceholderText(tr("Search Address"));
+
+  m_lock_btn = new QToolButton();
+  m_lock_btn->setIcon(Resources::GetThemeIcon("pause"));
+  m_lock_btn->setCheckable(true);
+  m_lock_btn->setMinimumSize(24, 24);
+  m_lock_btn->setToolTip(tr("When enabled, prevents automatic updates to the code view."));
   m_branch_watch = new QPushButton(tr("Branch Watch"));
+
   top_layout->addWidget(m_search_address);
+  top_layout->addWidget(m_lock_btn);
   top_layout->addWidget(m_branch_watch);
 
   auto* right_layout = new QVBoxLayout;
@@ -191,6 +201,7 @@ void CodeWidget::ConnectWidgets()
 
   connect(m_search_address, &QLineEdit::textChanged, this, &CodeWidget::OnSearchAddress);
   connect(m_search_address, &QLineEdit::returnPressed, this, &CodeWidget::OnSearchAddress);
+  connect(m_lock_btn, &QPushButton::toggled, m_code_view, &CodeViewWidget::OnLockAddress);
   connect(m_search_symbols, &QLineEdit::textChanged, this, &CodeWidget::OnSearchSymbols);
   connect(m_search_calls, &QLineEdit::textChanged, this, [this] {
     if (const Common::Symbol* symbol = m_ppc_symbol_db.GetSymbolFromAddr(m_code_view->GetAddress()))
diff --git a/Source/Core/DolphinQt/Debugger/CodeWidget.h b/Source/Core/DolphinQt/Debugger/CodeWidget.h
index a7ca9f4a0c..76ada4f506 100644
--- a/Source/Core/DolphinQt/Debugger/CodeWidget.h
+++ b/Source/Core/DolphinQt/Debugger/CodeWidget.h
@@ -17,6 +17,7 @@ class QSplitter;
 class QListWidget;
 class QPushButton;
 class QTableWidget;
+class QToolButton;
 
 namespace Common
 {
@@ -80,6 +81,7 @@ private:
 
   BranchWatchDialog* m_branch_watch_dialog = nullptr;
   QLineEdit* m_search_address;
+  QToolButton* m_lock_btn;
   QPushButton* m_branch_watch;
 
   QLineEdit* m_search_callstack;