Complete rewrite of Tweens

* Tweens were changed from Node to RefCounted. New API is inspired by DOTween.
* Tweens are created and managed by SceneTree, similar to SceneTreeTimer, which makes them ultra cheap to use a lot.
* Animating with Tweens is done by creating sequences of Tweeners. You create them from code and they autostart by default (fire-and-forget).
* There are 4 Tweeners that cover the former Tween functionality: PropertyTweener, IntervalTweener, CallbackTweener and MethodTweener.
* The methods were simplified a lot. Long argument lists are replaced with chained calls on Tweens and Tweeners.
* Tweeners by default execute in sequence, so it's easy to create complex chained animations.
* You can bind a Tween to a node. Tween will be removed automatically when the bound node is freed.

1 files changed, 5 insertions, 0 deletions

diff --git a/scene/main/node.h b/scene/main/node.h
index e7b36f351b..0d1685a2be 100644
--- a/scene/main/node.h
+++ b/scene/main/node.h
@@ -41,6 +41,9 @@
 
 class Viewport;
 class SceneState;
+class Tween;
+class PropertyTweener;
+
 class Node : public Object {
 	GDCLASS(Node, Object);
 	OBJ_CATEGORY("Nodes");
@@ -308,6 +311,8 @@ public:
 	void remove_and_skip();
 	int get_index() const;
 
+	Ref<Tween> create_tween();
+
 	void print_tree();
 	void print_tree_pretty();