From ff2bace1bff90fa58ea5b8eeb8f158e890f84c35 Mon Sep 17 00:00:00 2001
From: Brendan Hagan <bhaganksu@gmail.com>
Date: Mon, 5 Dec 2016 23:00:35 -0600
Subject: [PATCH] [Protocol] Add OnTransitionChange/OnTransitionListChange
 (Fixes #19)

---
 PROTOCOL.md  | 17 ++++++++++++-----
 WSEvents.cpp | 23 +++++++++++++++++++++++
 WSEvents.h   |  3 +++
 3 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/PROTOCOL.md b/PROTOCOL.md
index 20b5864e..d6af0f63 100644
--- a/PROTOCOL.md
+++ b/PROTOCOL.md
@@ -26,6 +26,13 @@ OBS is switching to another scene.
 #### "ScenesChanged"
 The scene list has been modified (Scenes have been added, removed, or renamed).
 
+#### "SwitchTransition"
+The active transition has been changed.  
+- **transition-name** (string) : The name of the active transition.
+
+#### "TransitionListChanged"
+The list of available transitions has been modified (Transitions have been added, removed, or renamed).
+
 #### "StreamStarting"
 A request to start streaming has been issued.  
 - **preview-only** (bool) : Always false.
@@ -50,7 +57,7 @@ A request to start recording has been issued.
 Recording started successfully.  
 *New in OBS Studio*
 
-#### "RecordingStopping" 
+#### "RecordingStopping"
 A request to stop streaming has been issued.  
 *New in OBS Studio*
 
@@ -93,7 +100,7 @@ Depending on the request type additional fields may be present (see the "[Reques
 
 ### Request Types
 #### "GetVersion"
-Returns the latest version of the plugin and the API. 
+Returns the latest version of the plugin and the API.
 
 __Request fields__ : none  
 __Response__ : always OK, with these additional fields :  
@@ -165,12 +172,12 @@ Toggle streaming on or off.
 __Request fields__ : none  
 __Response__ : always OK. No additional fields.
 
-#### "StartStopRecording" 
+#### "StartStopRecording"
 Toggle recording on or off.
 
 __Request fields__ : none  
 __Response__ : always OK. No additional fields.  
-*New in OBS Studio* 
+*New in OBS Studio*
 
 #### "GetStreamingStatus"
 Get current streaming and recording status.
@@ -211,7 +218,7 @@ __Response__ : OK if specified transition exists, error otherwise.
 
 *New in OBS Studio*  
 
-### Authentication 
+### Authentication
 A call to `GetAuthRequired` gives the client two elements :
 - A challenge : a random string that will be used to generate the auth response
 - A salt : applied to the password when generating the auth response
diff --git a/WSEvents.cpp b/WSEvents.cpp
index 1365a070..d87e63b2 100644
--- a/WSEvents.cpp
+++ b/WSEvents.cpp
@@ -43,6 +43,12 @@ void WSEvents::FrontendEventHandler(enum obs_frontend_event event, void *private
 	else if (event == OBS_FRONTEND_EVENT_SCENE_LIST_CHANGED) {
 		owner->OnSceneListChange();
 	}
+	else if (event == OBS_FRONTEND_EVENT_TRANSITION_CHANGED) {
+		owner->OnTransitionChange();
+	}
+	else if (event == OBS_FRONTEND_EVENT_TRANSITION_LIST_CHANGED) {
+		owner->OnTransitionListChange();
+	}
 	else if (event == OBS_FRONTEND_EVENT_STREAMING_STARTING) {
 		owner->OnStreamStarting();
 	}
@@ -126,6 +132,23 @@ void WSEvents::OnSceneListChange() {
 	broadcastUpdate("ScenesChanged");
 }
 
+void WSEvents::OnTransitionChange() {
+	obs_source_t *transition = obs_frontend_get_current_transition();
+	const char *transition_name = obs_source_get_name(transition);
+
+	obs_data_t *data = obs_data_create();
+	obs_data_set_string(data, "transition-name", transition_name);
+
+	broadcastUpdate("SwitchTransition", data);
+
+	obs_data_release(data);
+	obs_source_release(transition);
+}
+
+void WSEvents::OnTransitionListChange() {
+	broadcastUpdate("TransitionListChanged");
+}
+
 void WSEvents::OnStreamStarting() {
 	// Implements an existing update type from bilhamil's OBS Remote
 	obs_data_t *data = obs_data_create();
diff --git a/WSEvents.h b/WSEvents.h
index ae31f4fe..360585b5 100644
--- a/WSEvents.h
+++ b/WSEvents.h
@@ -47,6 +47,9 @@ class WSEvents : public QObject
 		void OnSceneChange();
 		void OnSceneListChange();
 
+		void OnTransitionChange();
+		void OnTransitionListChange();
+
 		void OnStreamStarting();
 		void OnStreamStarted();
 		void OnStreamStopping();