4 files changed, 51 insertions, 0 deletions
diff --git a/scene/animation/animation_blend_tree.cpp b/scene/animation/animation_blend_tree.cpp
index 3d81b6b9e8..eb30c7f4d6 100644
--- a/scene/animation/animation_blend_tree.cpp
+++ b/scene/animation/animation_blend_tree.cpp
@@ -1175,6 +1175,7 @@ void AnimationNodeBlendTree::_tree_changed() {
 void AnimationNodeBlendTree::_node_changed(const StringName &p_node) {
 	ERR_FAIL_COND(!nodes.has(p_node));
 	nodes[p_node].connections.resize(nodes[p_node].node->get_input_count());
+	emit_signal(SNAME("node_changed"), p_node);
 }
 
 void AnimationNodeBlendTree::_bind_methods() {
@@ -1200,6 +1201,8 @@ void AnimationNodeBlendTree::_bind_methods() {
 	BIND_CONSTANT(CONNECTION_ERROR_NO_OUTPUT);
 	BIND_CONSTANT(CONNECTION_ERROR_SAME_NODE);
 	BIND_CONSTANT(CONNECTION_ERROR_CONNECTION_EXISTS);
+
+	ADD_SIGNAL(MethodInfo("node_changed", PropertyInfo(Variant::STRING_NAME, "node_name")));
 }
 
 void AnimationNodeBlendTree::_initialize_node_tree() {
diff --git a/scene/animation/animation_player.cpp b/scene/animation/animation_player.cpp
index 073f61bfdd..d7afe5070c 100644
--- a/scene/animation/animation_player.cpp
+++ b/scene/animation/animation_player.cpp
@@ -1270,6 +1270,8 @@ void AnimationPlayer::_animation_set_cache_update() {
 		// If something was modified or removed, caches need to be cleared
 		clear_caches();
 	}
+
+	emit_signal(SNAME("animation_list_changed"));
 }
 
 void AnimationPlayer::_animation_added(const StringName &p_name, const StringName &p_library) {
@@ -2150,6 +2152,7 @@ void AnimationPlayer::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("animation_finished", PropertyInfo(Variant::STRING_NAME, "anim_name")));
 	ADD_SIGNAL(MethodInfo("animation_changed", PropertyInfo(Variant::STRING_NAME, "old_name"), PropertyInfo(Variant::STRING_NAME, "new_name")));
 	ADD_SIGNAL(MethodInfo("animation_started", PropertyInfo(Variant::STRING_NAME, "anim_name")));
+	ADD_SIGNAL(MethodInfo("animation_list_changed"));
 	ADD_SIGNAL(MethodInfo("caches_cleared"));
 
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_PHYSICS);
diff --git a/scene/animation/animation_tree.cpp b/scene/animation/animation_tree.cpp
index d06324f0aa..c1e674dad5 100644
--- a/scene/animation/animation_tree.cpp
+++ b/scene/animation/animation_tree.cpp
@@ -847,6 +847,11 @@ bool AnimationTree::_update_caches(AnimationPlayer *player) {
 	return true;
 }
 
+void AnimationTree::_animation_player_changed() {
+	emit_signal(SNAME("animation_player_changed"));
+	_clear_caches();
+}
+
 void AnimationTree::_clear_caches() {
 	for (KeyValue<NodePath, TrackCache *> &K : track_cache) {
 		memdelete(K.value);
@@ -1738,6 +1743,7 @@ void AnimationTree::advance(real_t p_time) {
 void AnimationTree::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_ENTER_TREE: {
+			_setup_animation_player();
 			if (last_animation_player.is_valid()) {
 				Object *player = ObjectDB::get_instance(last_animation_player);
 				if (player) {
@@ -1770,8 +1776,43 @@ void AnimationTree::_notification(int p_what) {
 	}
 }
 
+void AnimationTree::_setup_animation_player() {
+	if (!is_inside_tree()) {
+		return;
+	}
+
+	AnimationPlayer *new_player = nullptr;
+	if (!animation_player.is_empty()) {
+		new_player = Object::cast_to<AnimationPlayer>(get_node(animation_player));
+		if (new_player && !new_player->is_connected("animation_list_changed", callable_mp(this, &AnimationTree::_animation_player_changed))) {
+			new_player->connect("animation_list_changed", callable_mp(this, &AnimationTree::_animation_player_changed));
+		}
+	}
+
+	if (new_player) {
+		if (!last_animation_player.is_valid()) {
+			// Animation player set newly.
+			emit_signal(SNAME("animation_player_changed"));
+			return;
+		} else if (last_animation_player == new_player->get_instance_id()) {
+			// Animation player isn't changed.
+			return;
+		}
+	} else if (!last_animation_player.is_valid()) {
+		// Animation player is being empty.
+		return;
+	}
+
+	AnimationPlayer *old_player = Object::cast_to<AnimationPlayer>(ObjectDB::get_instance(last_animation_player));
+	if (old_player && old_player->is_connected("animation_list_changed", callable_mp(this, &AnimationTree::_animation_player_changed))) {
+		old_player->disconnect("animation_list_changed", callable_mp(this, &AnimationTree::_animation_player_changed));
+	}
+	emit_signal(SNAME("animation_player_changed"));
+}
+
 void AnimationTree::set_animation_player(const NodePath &p_player) {
 	animation_player = p_player;
+	_setup_animation_player();
 	update_configuration_warnings();
 }
 
@@ -2008,6 +2049,8 @@ void AnimationTree::_bind_methods() {
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_PHYSICS);
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_IDLE);
 	BIND_ENUM_CONSTANT(ANIMATION_PROCESS_MANUAL);
+
+	ADD_SIGNAL(MethodInfo("animation_player_changed"));
 }
 
 AnimationTree::AnimationTree() {
diff --git a/scene/animation/animation_tree.h b/scene/animation/animation_tree.h
index ee0c0303dc..573448be93 100644
--- a/scene/animation/animation_tree.h
+++ b/scene/animation/animation_tree.h
@@ -282,6 +282,8 @@ private:
 	bool cache_valid = false;
 	void _node_removed(Node *p_node);
 
+	void _setup_animation_player();
+	void _animation_player_changed();
 	void _clear_caches();
 	bool _update_caches(AnimationPlayer *player);
 	void _process_graph(double p_delta);