in my opinion, PIStateMachine is ready to real work

libs/main/state_machine/pistatemachine_state.cpp

@@ -97,8 +97,8 @@ void PIStateBase::print(PIString prefix) {
 }
 
 
-bool PIStateBase::start() {
-	if (isActive()) return true;
+bool PIStateBase::start(bool force) {
+	if (!force && isActive()) return true;
 	if (isAtomic()) {
 		setActive(true);
 		return true;
@@ -197,6 +197,20 @@ void PIStateBase::propagateRoot(PIStateMachine * r) {
 }
 
 
+PIVector<PIStateBase *> PIStateBase::gatherStates() {
+	PIVector<PIStateBase *> ret, slice, prev_slice({this});
+	while (prev_slice.isNotEmpty()) {
+		slice.clear();
+		for (auto s: prev_slice) {
+			ret << s;
+			slice << s->children;
+		}
+		prev_slice.swap(slice);
+	}
+	return ret;
+}
+
+
 void PIStateBase::gatherActiveStates(PIVector<PIStateBase *> & output) {
 	for (auto * c: children)
 		c->gatherActiveStates(output);

libs/main/state_machine/pistatemachine_state.h

@@ -74,8 +74,10 @@ public:
 
 	void print(PIString prefix = {});
 
+	PIVector<PIStateBase *> gatherStates();
+
 protected:
-	bool start();
+	bool start(bool force = false);
 	void setActive(bool yes);
 	void setActiveRecursive(bool yes);
 	void setChildrenActive(bool yes);

libs/main/state_machine/pistatemachine_transition.cpp

@@ -91,7 +91,7 @@ void PITransitionBase::trigger() {
 		else
 			source_target_path[i]->activeChild(source_target_path[i + 1]);
 	}
-	if (target_state->isCompound()) target_state->start();
+	if (target_state->isCompound()) target_state->start(true);
 }