BTPlayer: Fix `updated` signal and deprecate `behavior_tree_finished` signal

bt/bt_player.cpp

@@ -51,6 +51,7 @@ void BTPlayer::_load_tree() {
 	Node *scene_root = get_owner();
 	ERR_FAIL_NULL_MSG(scene_root, "BTPlayer: Initialization failed - can't get scene root (make sure the BTPlayer's owner property is set).");
 	bt_instance = behavior_tree->instantiate(agent, blackboard, this);
+	ERR_FAIL_COND_MSG(bt_instance.is_null(), "BTPlayer: Failed to instantiate behavior tree.");
 #ifdef DEBUG_ENABLED
 	bt_instance->set_monitor_performance(monitor_performance);
 	bt_instance->register_with_debugger();
@@ -118,7 +119,13 @@ void BTPlayer::update(double p_delta) {
 	}
 
 	if (active) {
-		bt_instance->update(p_delta);
+		BT::Status status = bt_instance->update(p_delta);
+		emit_signal(LW_NAME(updated), status);
+#ifndef DISABLE_DEPRECATED
+		if (status == BTTask::SUCCESS || status == BTTask::FAILURE) {
+			emit_signal(LW_NAME(behavior_tree_finished), status);
+		}
+#endif // DISABLE_DEPRECATED
 	}
 }
 
@@ -222,9 +229,12 @@ void BTPlayer::_bind_methods() {
 	BIND_ENUM_CONSTANT(PHYSICS);
 	BIND_ENUM_CONSTANT(MANUAL);
 
-	ADD_SIGNAL(MethodInfo("behavior_tree_finished", PropertyInfo(Variant::INT, "status")));
 	ADD_SIGNAL(MethodInfo("updated", PropertyInfo(Variant::INT, "status")));
 
+#ifndef DISABLE_DEPRECATED
+	ADD_SIGNAL(MethodInfo("behavior_tree_finished", PropertyInfo(Variant::INT, "status")));
+#endif
+
 #ifdef DEBUG_ENABLED
 	ClassDB::bind_method(D_METHOD("_set_monitor_performance", "enable"), &BTPlayer::_set_monitor_performance);
 	ClassDB::bind_method(D_METHOD("_get_monitor_performance"), &BTPlayer::_get_monitor_performance);

doc/source/classes/class_behaviortree.rst

@@ -121,7 +121,7 @@ Stores and manages variables that will be used in constructing new :ref:`Blackbo
 - |void| **set_description**\ (\ value\: ``String``\ )
 - ``String`` **get_description**\ (\ )
 
-User-provided description of the BehaviorTree.
+User-provided description of the **BehaviorTree**.
 
 .. rst-class:: classref-section-separator
 
@@ -174,11 +174,7 @@ Returns the root task of the BehaviorTree resource.
 
 :ref:`BTInstance<class_BTInstance>` **instantiate**\ (\ agent\: ``Node``, blackboard\: :ref:`Blackboard<class_Blackboard>`, instance_owner\: ``Node``\ ) |const| :ref:`🔗<class_BehaviorTree_method_instantiate>`
 
-Instantiates the behavior tree and returns :ref:`BTInstance<class_BTInstance>`.
-
-\ ``instance_owner`` should be the scene node that will own the behavior tree instance.
-
-This is typically a :ref:`BTPlayer<class_BTPlayer>`, :ref:`BTState<class_BTState>`, or a custom player node that controls the behavior tree execution.
+Instantiates the behavior tree and returns :ref:`BTInstance<class_BTInstance>`. ``instance_owner`` should be the scene node that will own the behavior tree instance. This is typically a :ref:`BTPlayer<class_BTPlayer>`, :ref:`BTState<class_BTState>`, or a custom player node that controls the behavior tree execution.
 
 .. rst-class:: classref-item-separator
 

doc/source/classes/class_btinstance.rst

@@ -12,9 +12,14 @@ BTInstance
 
 **Inherits:** 
 
-.. container:: contribute
+Represents a runtime instance of a :ref:`BehaviorTree<class_BehaviorTree>` resource.
 
-	There is currently no description for this class. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!
+.. rst-class:: classref-introduction-group
+
+Description
+-----------
+
+Can be created using the :ref:`BehaviorTree.instantiate<class_BehaviorTree_method_instantiate>` method.
 
 .. rst-class:: classref-reftable-group
 
@@ -178,11 +183,7 @@ Registers the behavior tree instance with the debugger.
 
 |void| **unregister_with_debugger**\ (\ ) :ref:`🔗<class_BTInstance_method_unregister_with_debugger>`
 
-Unregisters the behavior tree instance from the debugger. This is typically
-
-not necessary, as the debugger will automatically unregister the instance
-
-when it is freed.
+Unregisters the behavior tree instance from the debugger. This is typically not necessary, as the debugger will automatically unregister the instance when it is freed.
 
 .. rst-class:: classref-item-separator
 

doc/source/classes/class_btplayer.rst

@@ -78,6 +78,8 @@ Signals
 
 **behavior_tree_finished**\ (\ status\: ``int``\ ) :ref:`🔗<class_BTPlayer_signal_behavior_tree_finished>`
 
+**Deprecated:** Use :ref:`updated<class_BTPlayer_signal_updated>` signal instead.
+
 Emitted when the behavior tree has finished executing and returned ``SUCCESS`` or ``FAILURE``.
 
 Argument ``status`` holds the status returned by the behavior tree. See :ref:`Status<enum_BT_Status>`.

doc_classes/BTPlayer.xml

@@ -54,7 +54,7 @@
 		</member>
 	</members>
 	<signals>
-		<signal name="behavior_tree_finished">
+		<signal name="behavior_tree_finished" deprecated="Use [signal updated] signal instead.">
 			<param index="0" name="status" type="int" />
 			<description>
 				Emitted when the behavior tree has finished executing and returned [code]SUCCESS[/code] or [code]FAILURE[/code].