Add hysteresis to Switch in momentary mode

include/app/Switch.hpp

@@ -10,7 +10,11 @@ namespace rack {
 struct Switch : ParamWidget {
 	/** Return to original position when released */
 	bool momentary = false;
+	/** Hysteresis state for momentary switch */
+	bool momentaryPressed = false;
+	bool momentaryReleased = false;
 
+	void step() override;
 	void onDragStart(const event::DragStart &e) override;
 	void onDragEnd(const event::DragEnd &e) override;
 };

src/app/Switch.cpp

@@ -7,11 +7,27 @@
 namespace rack {
 
 
+void Switch::step() {
+	if (momentaryPressed) {
+		momentaryPressed = false;
+		// Wait another frame.
+	}
+	else if (momentaryReleased) {
+		momentaryReleased = false;
+		if (paramQuantity) {
+			// Set to minimum value
+			paramQuantity->setMin();
+		}
+	}
+	ParamWidget::step();
+}
+
 void Switch::onDragStart(const event::DragStart &e) {
 	if (momentary) {
 		if (paramQuantity) {
 			// Set to maximum value
 			paramQuantity->setMax();
+			momentaryPressed = true;
 		}
 	}
 	else {
@@ -41,10 +57,7 @@ void Switch::onDragStart(const event::DragStart &e) {
 
 void Switch::onDragEnd(const event::DragEnd &e) {
 	if (momentary) {
-		if (paramQuantity) {
-			// Set to minimum value
-			paramQuantity->setMin();
-		}
+		momentaryReleased = true;
 	}
 }
 

src/main.cpp

@@ -77,7 +77,7 @@ int main(int argc, char *argv[]) {
 	gamepad::init();
 	ui::init();
 	plugin::init(devMode);
-	INFO("Initialized environment")
+	INFO("Initialized environment");
 
 	// Initialize app
 	appInit();
@@ -105,7 +105,7 @@ int main(int argc, char *argv[]) {
 		app()->scene->rackWidget->load(patchFile);
 		app()->scene->rackWidget->lastPath = patchFile;
 	}
-	INFO("Initialized app")
+	INFO("Initialized app");
 
 	app()->engine->start();
 	app()->window->run();
@@ -116,14 +116,14 @@ int main(int argc, char *argv[]) {
 	app()->scene->rackWidget->save(asset::user("autosave.vcv"));
 	settings::save(asset::user("settings.json"));
 	appDestroy();
-	INFO("Cleaned up app")
+	INFO("Cleaned up app");
 
 	// Destroy environment
 	plugin::destroy();
 	ui::destroy();
 	bridgeDestroy();
 	midi::destroy();
-	INFO("Cleaned up environment")
+	INFO("Cleaned up environment");
 	logger::destroy();
 
 	return 0;