Allow interacting with OBS main window while plugin settings are opened

src/advanced-scene-switcher.cpp

@@ -20,6 +20,7 @@ SwitcherData *switcher = nullptr;
 AdvSceneSwitcher::AdvSceneSwitcher(QWidget *parent)
 	: QDialog(parent), ui(new Ui_AdvSceneSwitcher)
 {
+	switcher->settingsWindowOpened = true;
 	ui->setupUi(this);
 
 	std::lock_guard<std::mutex> lock(switcher->m);
@@ -28,6 +29,13 @@ AdvSceneSwitcher::AdvSceneSwitcher(QWidget *parent)
 	loadUI();
 }
 
+AdvSceneSwitcher::~AdvSceneSwitcher()
+{
+	if (switcher) {
+		switcher->settingsWindowOpened = false;
+	}
+}
+
 bool translationAvailable()
 {
 	return !!strcmp(obs_module_text("AdvSceneSwitcher.pluginName"),
@@ -635,6 +643,8 @@ static void OBSEvent(enum obs_frontend_event event, void *switcher)
 	}
 }
 
+AdvSceneSwitcher *ssWindow;
+
 extern "C" void InitSceneSwitcher()
 {
 	blog(LOG_INFO, "version: %s", g_GIT_TAG);
@@ -652,11 +662,16 @@ extern "C" void InitSceneSwitcher()
 	PlatformInit();
 
 	auto cb = []() {
-		QMainWindow *window =
-			(QMainWindow *)obs_frontend_get_main_window();
-
-		AdvSceneSwitcher ss(window);
-		ss.exec();
+		if (switcher->settingsWindowOpened) {
+			ssWindow->show();
+			ssWindow->raise();
+			ssWindow->activateWindow();
+		} else {
+			ssWindow = new AdvSceneSwitcher(
+				(QMainWindow *)obs_frontend_get_main_window());
+			ssWindow->setAttribute(Qt::WA_DeleteOnClose);
+			ssWindow->show();
+		}
 	};
 
 	obs_frontend_add_save_callback(SaveSceneSwitcher, nullptr);

src/general.cpp

@@ -186,6 +186,9 @@ void AdvSceneSwitcher::on_toggleStartButton_clicked()
 
 void AdvSceneSwitcher::closeEvent(QCloseEvent *)
 {
+	if (!switcher) {
+		return;
+	}
 	switcher->windowPos = this->pos();
 	switcher->windowSize = this->size();
 

src/headers/advanced-scene-switcher.hpp

@@ -29,6 +29,7 @@ public:
 	bool currentStatusActive = false;
 
 	AdvSceneSwitcher(QWidget *parent);
+	~AdvSceneSwitcher();
 
 	void reject() override;
 	void closeEvent(QCloseEvent *event) override;

src/headers/switcher-data-structs.hpp

@@ -64,6 +64,8 @@ class SwitcherThread;
 struct SwitcherData {
 	SwitcherThread *th = nullptr;
 
+	bool settingsWindowOpened = false;
+
 	std::condition_variable cv;
 	std::mutex m;
 	bool transitionActive = false;