Common/Config: Add a utility class to suppress config change callbacks.

2 files changed, 30 insertions, 1 deletions

diff --git a/Source/Core/Common/Config/Config.cpp b/Source/Core/Common/Config/Config.cpp
index 30215aec06..122d2d6ff1 100644
--- a/Source/Core/Common/Config/Config.cpp
+++ b/Source/Core/Common/Config/Config.cpp
@@ -12,6 +12,7 @@ namespace Config
 {
 static Layers s_layers;
 static std::list<ConfigChangedCallback> s_callbacks;
+static u32 s_callback_guards = 0;
 
 Layers* GetLayers()
 {
@@ -53,6 +54,9 @@ void AddConfigChangedCallback(ConfigChangedCallback func)
 
 void InvokeConfigChangedCallbacks()
 {
+  if (s_callback_guards)
+    return;
+
   for (const auto& callback : s_callbacks)
     callback();
 }
@@ -137,4 +141,18 @@ LayerType GetActiveLayerForConfig(const ConfigLocation& config)
   // If config is not present in any layer, base layer is considered active.
   return LayerType::Base;
 }
+
+ConfigChangeCallbackGuard::ConfigChangeCallbackGuard()
+{
+  ++s_callback_guards;
 }
+
+ConfigChangeCallbackGuard::~ConfigChangeCallbackGuard()
+{
+  if (--s_callback_guards)
+    return;
+
+  InvokeConfigChangedCallbacks();
+}
+
+}  // namespace Config
diff --git a/Source/Core/Common/Config/Config.h b/Source/Core/Common/Config/Config.h
index 1418a86606..4120d029ba 100644
--- a/Source/Core/Common/Config/Config.h
+++ b/Source/Core/Common/Config/Config.h
@@ -96,4 +96,15 @@ void SetBaseOrCurrent(const ConfigInfo<T>& info, const std::common_type_t<T>& va
   else
     Set<T>(LayerType::CurrentRun, info, value);
 }
-}
+
+// Used to defer InvokeConfigChangedCallbacks until after the completion of many config changes.
+class ConfigChangeCallbackGuard
+{
+public:
+  ConfigChangeCallbackGuard();
+  ~ConfigChangeCallbackGuard();
+
+  ConfigChangeCallbackGuard(const ConfigChangeCallbackGuard&) = delete;
+  ConfigChangeCallbackGuard& operator=(const ConfigChangeCallbackGuard&) = delete;
+};
+}  // namespace Config