Add SetPreviewScene request type and PreviewSceneChanged event

Utils.cpp

@@ -18,13 +18,12 @@ with this program. If not, see <https://www.gnu.org/licenses/>
 
 #include "Utils.h"
 #include <obs-frontend-api.h>
+#include <obs.hpp>
 #include <QMainWindow>
-#include <QSpinBox>
-#include <QPushButton>
-#include <QListWidget>
-#include <QLayout>
 #include "obs-websocket.h"
 
+Q_DECLARE_METATYPE(OBSScene);
+
 obs_data_array_t* string_list_to_array(char** strings, char* key)
 {
 	if (!strings)
@@ -247,6 +246,21 @@ QPushButton* Utils::GetPreviewModeButtonControl()
 	return main->findChild<QPushButton*>("modeSwitch");
 }
 
+QListWidget* Utils::GetSceneListControl()
+{
+	QMainWindow* main = (QMainWindow*)obs_frontend_get_main_window();
+	return main->findChild<QListWidget*>("scenes");
+}
+
+obs_scene_t* Utils::SceneListItemToScene(QListWidgetItem* item)
+{
+	if (!item)
+		return nullptr;
+
+	QVariant item_data = item->data(static_cast<int>(Qt::UserRole));
+	return item_data.value<OBSScene>();
+}
+
 QLayout* Utils::GetPreviewLayout()
 {
 	QMainWindow* main = (QMainWindow*)obs_frontend_get_main_window();
@@ -288,16 +302,32 @@ const char* Utils::GetPreviewSceneName()
 {
 	if (IsPreviewModeActive())
 	{
-		QMainWindow* main = (QMainWindow*)obs_frontend_get_main_window();
-		QListWidget* sceneList = main->findChild<QListWidget*>("scenes");
+		QListWidget* sceneList = GetSceneListControl();
 
-		QString name = sceneList->selectedItems().first()->text();
-		return name.toUtf8().constData();
+		QList<QListWidgetItem*> selected = sceneList->selectedItems();
+		blog(LOG_INFO, "GetPreviewSceneName: %d selected item(s)", selected.count());
+
+		// Qt::UserRole == QtUserRole::OBSRef
+		obs_source_t* source = obs_scene_get_source(Utils::SceneListItemToScene(selected.first()));
+
+		return obs_source_get_name(source);
 	}
 	
 	return nullptr;
 }
 
+void Utils::SetPreviewScene(const char* name)
+{
+	if (IsPreviewModeActive())
+	{
+		QListWidget* sceneList = GetSceneListControl();
+		QList<QListWidgetItem*> matchingItems = sceneList->findItems(name, Qt::MatchExactly);
+
+		if (matchingItems.count() > 0)
+			sceneList->setCurrentItem(matchingItems.first());
+	}
+}
+
 void Utils::TransitionToProgram()
 {
 	if (!IsPreviewModeActive())

Utils.h

@@ -22,6 +22,7 @@ with this program. If not, see <https://www.gnu.org/licenses/>
 #include <QSpinBox>
 #include <QPushButton>
 #include <QLayout>
+#include <QListWidget>
 #include <stdio.h>
 #include <obs-module.h>
 
@@ -46,6 +47,8 @@ class Utils
 
 		static QPushButton* GetPreviewModeButtonControl();
 		static QLayout* GetPreviewLayout();
+		static QListWidget* GetSceneListControl();
+		static obs_scene_t* SceneListItemToScene(QListWidgetItem* item);
 
 		static bool IsPreviewModeActive();
 		static void EnablePreviewMode();
@@ -53,6 +56,7 @@ class Utils
 		static void TogglePreviewMode();
 
 		static const char* GetPreviewSceneName();
+		static void SetPreviewScene(const char* name);
 		static void TransitionToProgram();
 
 		static const char* OBSVersionString();

WSEvents.cpp

@@ -68,6 +68,9 @@ WSEvents::WSEvents(WSServer *srv)
 	connect(statusTimer, SIGNAL(timeout()), this, SLOT(StreamStatus()));
 	statusTimer->start(2000); // equal to frontend's constant BITRATE_UPDATE_SECONDS
 
+	QListWidget* sceneList = Utils::GetSceneListControl();
+	connect(sceneList, SIGNAL(currentItemChanged(QListWidgetItem*, QListWidgetItem*)), this, SLOT(SelectedSceneChanged(QListWidgetItem*, QListWidgetItem*)));
+
 	transition_handler = nullptr;
 	scene_handler = nullptr;
 
@@ -569,3 +572,21 @@ void WSEvents::OnSceneItemVisibilityChanged(void *param, calldata_t *data)
 
 	obs_data_release(fields);
 }
+
+void WSEvents::SelectedSceneChanged(QListWidgetItem *current, QListWidgetItem *prev)
+{
+	if (Utils::IsPreviewModeActive())
+	{
+		obs_scene_t* scene = Utils::SceneListItemToScene(current);
+		if (!scene) return;
+
+		obs_source_t* scene_source = obs_scene_get_source(scene);
+
+		obs_data_t* data = obs_data_create();
+		obs_data_set_string(data, "scene-name", obs_source_get_name(scene_source));
+
+		broadcastUpdate("PreviewSceneChanged", data);
+
+		obs_data_release(data);
+	}
+}

WSEvents.h

@@ -21,6 +21,7 @@ with this program. If not, see <https://www.gnu.org/licenses/>
 #define WSEVENTS_H
 
 #include <obs-frontend-api.h>
+#include <QListWidgetItem>
 #include "WSServer.h"
 
 class WSEvents : public QObject 
@@ -43,6 +44,7 @@ class WSEvents : public QObject
 	private Q_SLOTS:
 		void StreamStatus();
 		void TransitionDurationChanged(int ms);
+		void SelectedSceneChanged(QListWidgetItem *current, QListWidgetItem *prev);
 		void deferredInitOperations();
 
 	private:

WSRequestHandler.cpp

@@ -72,6 +72,7 @@ WSRequestHandler::WSRequestHandler(QWebSocket *client) :
 	messageMap["ListProfiles"] = WSRequestHandler::HandleListProfiles;
 
 	messageMap["GetStudioModeStatus"] = WSRequestHandler::HandleGetStudioModeStatus;
+	messageMap["SetPreviewScene"] = WSRequestHandler::HandleSetPreviewScene;
 	messageMap["EnableStudioMode"] = WSRequestHandler::HandleEnableStudioMode;
 	messageMap["DisableStudioMode"] = WSRequestHandler::HandleDisableStudioMode;
 	messageMap["ToggleStudioMode"] = WSRequestHandler::HandleToggleStudioMode;
@@ -759,8 +760,8 @@ void WSRequestHandler::HandleGetStudioModeStatus(WSRequestHandler *owner)
 	obs_data_set_bool(response, "studio-mode", previewActive);
 
 	if (previewActive) {
-		//const char* currentPreviewScene = Utils::GetPreviewSceneName();
-		//obs_data_set_string(response, "preview-scene", currentPreviewScene);
+		const char* currentPreviewScene = Utils::GetPreviewSceneName();
+		obs_data_set_string(response, "preview-scene", currentPreviewScene);
 	}
 
 	owner->SendOKResponse(response);
@@ -768,6 +769,20 @@ void WSRequestHandler::HandleGetStudioModeStatus(WSRequestHandler *owner)
 	obs_data_release(response);
 }
 
+void WSRequestHandler::HandleSetPreviewScene(WSRequestHandler *owner)
+{
+	const char* scene_name = obs_data_get_string(owner->_requestData, "scene-name");
+	if (!scene_name)
+	{
+		owner->SendErrorResponse("invalid request parameters");
+		return;
+	}
+
+	Utils::SetPreviewScene(scene_name);
+
+	owner->SendOKResponse();
+}
+
 void WSRequestHandler::HandleEnableStudioMode(WSRequestHandler *owner)
 {
 	Utils::EnablePreviewMode();

WSRequestHandler.h

@@ -89,6 +89,7 @@ class WSRequestHandler : public QObject
 		static void HandleGetTransitionDuration(WSRequestHandler *owner);
 
 		static void HandleGetStudioModeStatus(WSRequestHandler *owner);
+		static void HandleSetPreviewScene(WSRequestHandler *owner);
 		static void HandleEnableStudioMode(WSRequestHandler *owner);
 		static void HandleDisableStudioMode(WSRequestHandler *owner);
 		static void HandleToggleStudioMode(WSRequestHandler *owner);