From 3c7b1c8297377393aa155714f3c7aacda7d2eb4d Mon Sep 17 00:00:00 2001
From: cg2121 <claytong1214@gmail.com>
Date: Mon, 10 Oct 2022 22:38:32 -0500
Subject: [PATCH] obs-frontend-api: Add theme functions

This adds a frontend function to check if a theme is dark and also
adds an event for when the theme is changed.
---
 UI/api-interface.cpp                          |  5 +++++
 UI/obs-frontend-api/obs-frontend-api.cpp      |  5 +++++
 UI/obs-frontend-api/obs-frontend-api.h        |  3 +++
 UI/obs-frontend-api/obs-frontend-internal.hpp |  2 ++
 UI/window-basic-main.cpp                      |  3 +++
 docs/sphinx/reference-frontend-api.rst        | 10 ++++++++++
 6 files changed, 28 insertions(+)

diff --git a/UI/api-interface.cpp b/UI/api-interface.cpp
index ebc200c73..853ad6a8d 100644
--- a/UI/api-interface.cpp
+++ b/UI/api-interface.cpp
@@ -642,6 +642,11 @@ struct OBSStudioAPI : obs_frontend_callbacks {
 		return Str(string);
 	}
 
+	bool obs_frontend_is_theme_dark(void) override
+	{
+		return App()->IsThemeDark();
+	}
+
 	void on_load(obs_data_t *settings) override
 	{
 		for (size_t i = saveCallbacks.size(); i > 0; i--) {
diff --git a/UI/obs-frontend-api/obs-frontend-api.cpp b/UI/obs-frontend-api/obs-frontend-api.cpp
index 18ace62c4..51cb7693f 100644
--- a/UI/obs-frontend-api/obs-frontend-api.cpp
+++ b/UI/obs-frontend-api/obs-frontend-api.cpp
@@ -571,3 +571,8 @@ const char *obs_frontend_get_locale_string(const char *string)
 	return !!callbacks_valid() ? c->obs_frontend_get_locale_string(string)
 				   : nullptr;
 }
+
+bool obs_frontend_is_theme_dark(void)
+{
+	return !!callbacks_valid() ? c->obs_frontend_is_theme_dark() : false;
+}
diff --git a/UI/obs-frontend-api/obs-frontend-api.h b/UI/obs-frontend-api/obs-frontend-api.h
index 14c811279..864422982 100644
--- a/UI/obs-frontend-api/obs-frontend-api.h
+++ b/UI/obs-frontend-api/obs-frontend-api.h
@@ -60,6 +60,7 @@ enum obs_frontend_event {
 	OBS_FRONTEND_EVENT_SCRIPTING_SHUTDOWN,
 	OBS_FRONTEND_EVENT_PROFILE_RENAMED,
 	OBS_FRONTEND_EVENT_SCENE_COLLECTION_RENAMED,
+	OBS_FRONTEND_EVENT_THEME_CHANGED,
 };
 
 /* ------------------------------------------------------------------------- */
@@ -228,6 +229,8 @@ EXPORT void obs_frontend_open_source_interaction(obs_source_t *source);
 EXPORT char *obs_frontend_get_current_record_output_path(void);
 EXPORT const char *obs_frontend_get_locale_string(const char *string);
 
+EXPORT bool obs_frontend_is_theme_dark(void);
+
 /* ------------------------------------------------------------------------- */
 
 #ifdef __cplusplus
diff --git a/UI/obs-frontend-api/obs-frontend-internal.hpp b/UI/obs-frontend-api/obs-frontend-internal.hpp
index 3197b4348..8a666cb85 100644
--- a/UI/obs-frontend-api/obs-frontend-internal.hpp
+++ b/UI/obs-frontend-api/obs-frontend-internal.hpp
@@ -145,6 +145,8 @@ struct obs_frontend_callbacks {
 	virtual char *obs_frontend_get_current_record_output_path(void) = 0;
 	virtual const char *
 	obs_frontend_get_locale_string(const char *string) = 0;
+
+	virtual bool obs_frontend_is_theme_dark(void) = 0;
 };
 
 EXPORT void
diff --git a/UI/window-basic-main.cpp b/UI/window-basic-main.cpp
index c53f85b9f..fe92193f5 100644
--- a/UI/window-basic-main.cpp
+++ b/UI/window-basic-main.cpp
@@ -10316,4 +10316,7 @@ void OBSBasic::ResetProxyStyleSliders()
 		ActivateAudioSource(source);
 
 	UpdateContextBar(true);
+
+	if (api)
+		api->on_event(OBS_FRONTEND_EVENT_THEME_CHANGED);
 }
diff --git a/docs/sphinx/reference-frontend-api.rst b/docs/sphinx/reference-frontend-api.rst
index 302d1be00..6beada0f2 100644
--- a/docs/sphinx/reference-frontend-api.rst
+++ b/docs/sphinx/reference-frontend-api.rst
@@ -178,6 +178,10 @@ Structures/Enumerations
 
      Triggered when the virtual camera is stopped.
 
+   - **OBS_FRONTEND_EVENT_THEME_CHANGED**
+
+     Triggered when the theme is changed.
+
 
 .. struct:: obs_frontend_source_list
 
@@ -785,3 +789,9 @@ Functions
 .. function:: const char *obs_frontend_get_locale_string(const char *string)
 
    :return: Gets the frontend translation of a given string.
+
+---------------------------------------
+
+.. function:: bool obs_frontend_is_theme_dark(void)
+
+   :return: Checks if the current theme is dark or light.