BehaviorTree: New signal for when BB plan changes

Utilize `plan_changed` signal in `BTPlayer` and `BTState`.

bt/behavior_tree.cpp

@@ -48,7 +48,7 @@ void BehaviorTree::set_blackboard_plan(const Ref<BlackboardPlan> &p_plan) {
 		blackboard_plan->connect(LW_NAME(changed), callable_mp(this, &BehaviorTree::_plan_changed));
 	}
 
-	emit_changed();
+	_plan_changed();
 }
 
 void BehaviorTree::set_root_task(const Ref<BTTask> &p_value) {
@@ -79,6 +79,7 @@ Ref<BTTask> BehaviorTree::instantiate(Node *p_agent, const Ref<Blackboard> &p_bl
 }
 
 void BehaviorTree::_plan_changed() {
+	emit_signal(LW_NAME(plan_changed));
 	emit_changed();
 }
 
@@ -96,6 +97,8 @@ void BehaviorTree::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "description", PROPERTY_HINT_MULTILINE_TEXT), "set_description", "get_description");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "blackboard_plan", PROPERTY_HINT_RESOURCE_TYPE, "BlackboardPlan", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_EDITOR_INSTANTIATE_OBJECT), "set_blackboard_plan", "get_blackboard_plan");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "root_task", PROPERTY_HINT_RESOURCE_TYPE, "BTTask", PROPERTY_USAGE_NO_EDITOR | PROPERTY_USAGE_INTERNAL), "set_root_task", "get_root_task");
+
+	ADD_SIGNAL(MethodInfo("plan_changed"));
 }
 
 BehaviorTree::BehaviorTree() {

bt/bt_player.cpp

@@ -63,17 +63,21 @@ void BTPlayer::_load_tree() {
 void BTPlayer::_update_blackboard_plan() {
 	if (blackboard_plan.is_null()) {
 		blackboard_plan = Ref<BlackboardPlan>(memnew(BlackboardPlan));
+	} else if (!RESOURCE_IS_BUILT_IN(blackboard_plan)) {
+		WARN_PRINT_ED("BTPlayer: Using external resource for derived blackboard plan is not supported. Converted to built-in resource.");
+		blackboard_plan = blackboard_plan->duplicate();
 	}
+
 	blackboard_plan->set_base_plan(behavior_tree.is_valid() ? behavior_tree->get_blackboard_plan() : nullptr);
 }
 
 void BTPlayer::set_behavior_tree(const Ref<BehaviorTree> &p_tree) {
 	if (Engine::get_singleton()->is_editor_hint()) {
-		if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(changed), callable_mp(this, &BTPlayer::_update_blackboard_plan))) {
+		if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(plan_changed), callable_mp(this, &BTPlayer::_update_blackboard_plan))) {
-			behavior_tree->disconnect(LW_NAME(changed), callable_mp(this, &BTPlayer::_update_blackboard_plan));
+			behavior_tree->disconnect(LW_NAME(plan_changed), callable_mp(this, &BTPlayer::_update_blackboard_plan));
 		}
 		if (p_tree.is_valid()) {
-			p_tree->connect(LW_NAME(changed), callable_mp(this, &BTPlayer::_update_blackboard_plan));
+			p_tree->connect(LW_NAME(plan_changed), callable_mp(this, &BTPlayer::_update_blackboard_plan));
 		}
 		behavior_tree = p_tree;
 		_update_blackboard_plan();
@@ -86,12 +90,7 @@ void BTPlayer::set_behavior_tree(const Ref<BehaviorTree> &p_tree) {
 }
 
 void BTPlayer::set_blackboard_plan(const Ref<BlackboardPlan> &p_plan) {
-	if (p_plan.is_valid() && !RESOURCE_IS_BUILT_IN(p_plan)) {
+	blackboard_plan = p_plan;
-		WARN_PRINT_ED("BTPlayer: Using external resource for derived blackboard plan is not supported. Converted to built-in resource.");
-		blackboard_plan = p_plan->duplicate();
-	} else {
-		blackboard_plan = p_plan;
-	}
 	_update_blackboard_plan();
 }
 
@@ -217,8 +216,8 @@ void BTPlayer::_notification(int p_notification) {
 #endif // DEBUG_ENABLED
 
 			if (Engine::get_singleton()->is_editor_hint()) {
-				if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(changed), callable_mp(this, &BTPlayer::_update_blackboard_plan))) {
+				if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(plan_changed), callable_mp(this, &BTPlayer::_update_blackboard_plan))) {
-					behavior_tree->disconnect(LW_NAME(changed), callable_mp(this, &BTPlayer::_update_blackboard_plan));
+					behavior_tree->disconnect(LW_NAME(plan_changed), callable_mp(this, &BTPlayer::_update_blackboard_plan));
 				}
 			}
 

bt/bt_state.cpp

@@ -25,11 +25,11 @@
 
 void BTState::set_behavior_tree(const Ref<BehaviorTree> &p_tree) {
 	if (Engine::get_singleton()->is_editor_hint()) {
-		if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(changed), callable_mp(this, &BTState::_update_blackboard_plan))) {
+		if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(plan_changed), callable_mp(this, &BTState::_update_blackboard_plan))) {
-			behavior_tree->disconnect(LW_NAME(changed), callable_mp(this, &BTState::_update_blackboard_plan));
+			behavior_tree->disconnect(LW_NAME(plan_changed), callable_mp(this, &BTState::_update_blackboard_plan));
 		}
 		if (p_tree.is_valid()) {
-			p_tree->connect(LW_NAME(changed), callable_mp(this, &BTState::_update_blackboard_plan));
+			p_tree->connect(LW_NAME(plan_changed), callable_mp(this, &BTState::_update_blackboard_plan));
 		}
 		behavior_tree = p_tree;
 		_update_blackboard_plan();
@@ -97,8 +97,8 @@ void BTState::_notification(int p_notification) {
 #endif // DEBUG_ENABLED
 
 			if (Engine::get_singleton()->is_editor_hint()) {
-				if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(changed), callable_mp(this, &BTState::_update_blackboard_plan))) {
+				if (behavior_tree.is_valid() && behavior_tree->is_connected(LW_NAME(plan_changed), callable_mp(this, &BTState::_update_blackboard_plan))) {
-					behavior_tree->disconnect(LW_NAME(changed), callable_mp(this, &BTState::_update_blackboard_plan));
+					behavior_tree->disconnect(LW_NAME(plan_changed), callable_mp(this, &BTState::_update_blackboard_plan));
 				}
 			}
 		} break;

doc/source/classes/class_behaviortree.rst

@@ -73,6 +73,23 @@ Methods
 
 .. rst-class:: classref-descriptions-group
 
+Signals
+-------
+
+.. _class_BehaviorTree_signal_plan_changed:
+
+.. rst-class:: classref-signal
+
+**plan_changed** **(** **)**
+
+Emitted when the :ref:`BlackboardPlan<class_BlackboardPlan>` changes.
+
+.. rst-class:: classref-section-separator
+
+----
+
+.. rst-class:: classref-descriptions-group
+
 Property Descriptions
 ---------------------
 

doc_classes/BehaviorTree.xml

@@ -58,4 +58,11 @@
 			User-provided description of the BehaviorTree.
 		</member>
 	</members>
+	<signals>
+		<signal name="plan_changed">
+			<description>
+				Emitted when the [BlackboardPlan] changes.
+			</description>
+		</signal>
+	</signals>
 </class>

util/limbo_string_names.cpp

@@ -122,6 +122,7 @@ LimboStringNames::LimboStringNames() {
 	NonFavorite = SN("NonFavorite");
 	normal = SN("normal");
 	panel = SN("panel");
+	plan_changed = SN("plan_changed");
 	popup_hide = SN("popup_hide");
 	pressed = SN("pressed");
 	probability_clicked = SN("probability_clicked");

util/limbo_string_names.h

@@ -137,6 +137,7 @@ public:
 	StringName NonFavorite;
 	StringName normal;
 	StringName panel;
+	StringName plan_changed;
 	StringName popup_hide;
 	StringName pressed;
 	StringName probability_clicked;