Implement Animation Libraries

* Instead of containing single animations, AnimationPlayer now contains libraries.
* Libraries, in turn, contain the animations.

This paves the way for implementing the possibility of importing scenes as animation libraries, finally allowing to import animations separate from the 3D models.

Missing (will be done on separate PRs):

* Make it possible to import scenes (dae/fbx/gltf) as animation libraries.
* Make it possible for AnimationTree to import animation libraries on its own, so it does not rely on AnimationPlayer for everything.

1 files changed, 31 insertions, 6 deletions

diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index ccd24ed2cf..24cd485e1b 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -101,6 +101,7 @@ void TreeItem::_change_tree(Tree *p_tree) {
 
 		if (tree->popup_edited_item == this) {
 			tree->popup_edited_item = nullptr;
+			tree->popup_pressing_edited_item = nullptr;
 			tree->pressing_for_editor = false;
 		}
 
@@ -2670,8 +2671,8 @@ int Tree::propagate_mouse_event(const Point2i &p_pos, int x_ofs, int y_ofs, int
 		}
 
 		click_handled = true;
-		popup_edited_item = p_item;
-		popup_edited_item_col = col;
+		popup_pressing_edited_item = p_item;
+		popup_pressing_edited_item_column = col;
 
 		pressing_item_rect = Rect2(get_global_position() + Point2i(col_ofs, _get_title_button_height() + y_ofs) - cache.offset, Size2(col_width, item_h));
 		pressing_for_editor_text = editor_text;
@@ -3206,10 +3207,16 @@ void Tree::gui_input(const Ref<InputEvent> &p_event) {
 			update();
 		}
 
-		if (pressing_for_editor && popup_edited_item && (popup_edited_item->get_cell_mode(popup_edited_item_col) == TreeItem::CELL_MODE_RANGE)) {
-			//range drag
+		if (pressing_for_editor && popup_pressing_edited_item && (popup_pressing_edited_item->get_cell_mode(popup_pressing_edited_item_column) == TreeItem::CELL_MODE_RANGE)) {
+			/* This needs to happen now, because the popup can be closed when pressing another item, and must remain the popup edited item until it actually closes */
+			popup_edited_item = popup_pressing_edited_item;
+			popup_edited_item_col = popup_pressing_edited_item_column;
+
+			popup_pressing_edited_item = nullptr;
+			popup_pressing_edited_item_column = -1;
 
 			if (!range_drag_enabled) {
+				//range drag
 				Vector2 cpos = mm->get_position();
 				if (rtl) {
 					cpos.x = get_size().width - cpos.x;
@@ -3994,6 +4001,7 @@ void Tree::clear() {
 	selected_item = nullptr;
 	edited_item = nullptr;
 	popup_edited_item = nullptr;
+	popup_pressing_edited_item = nullptr;
 
 	update();
 };
@@ -4309,12 +4317,16 @@ int Tree::get_pressed_button() const {
 	return pressed_button;
 }
 
-Rect2 Tree::get_item_rect(TreeItem *p_item, int p_column) const {
+Rect2 Tree::get_item_rect(TreeItem *p_item, int p_column, int p_button) const {
 	ERR_FAIL_NULL_V(p_item, Rect2());
 	ERR_FAIL_COND_V(p_item->tree != this, Rect2());
 	if (p_column != -1) {
 		ERR_FAIL_INDEX_V(p_column, columns.size(), Rect2());
 	}
+	if (p_button != -1) {
+		ERR_FAIL_COND_V(p_column == -1, Rect2()); // pass a column if you want to pass a button
+		ERR_FAIL_INDEX_V(p_button, p_item->cells[p_column].buttons.size(), Rect2());
+	}
 
 	int ofs = get_item_offset(p_item);
 	int height = compute_item_height(p_item);
@@ -4332,6 +4344,19 @@ Rect2 Tree::get_item_rect(TreeItem *p_item, int p_column) const {
 		}
 		r.position.x = accum;
 		r.size.x = get_column_width(p_column);
+		if (p_button != -1) {
+			const TreeItem::Cell &c = p_item->cells[p_column];
+			Vector2 ofst = Vector2(r.position.x + r.size.x, r.position.y);
+			for (int j = c.buttons.size() - 1; j >= 0; j--) {
+				Ref<Texture2D> b = c.buttons[j].texture;
+				Size2 size = b->get_size() + cache.button_pressed->get_minimum_size();
+				ofst.x -= size.x;
+
+				if (j == p_button) {
+					return Rect2(ofst, size);
+				}
+			}
+		}
 	}
 
 	return r;
@@ -4870,7 +4895,7 @@ void Tree::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_edited_column"), &Tree::get_edited_column);
 	ClassDB::bind_method(D_METHOD("edit_selected"), &Tree::edit_selected);
 	ClassDB::bind_method(D_METHOD("get_custom_popup_rect"), &Tree::get_custom_popup_rect);
-	ClassDB::bind_method(D_METHOD("get_item_area_rect", "item", "column"), &Tree::get_item_rect, DEFVAL(-1));
+	ClassDB::bind_method(D_METHOD("get_item_area_rect", "item", "column", "button_index"), &Tree::get_item_rect, DEFVAL(-1), DEFVAL(-1));
 	ClassDB::bind_method(D_METHOD("get_item_at_position", "position"), &Tree::get_item_at_position);
 	ClassDB::bind_method(D_METHOD("get_column_at_position", "position"), &Tree::get_column_at_position);
 	ClassDB::bind_method(D_METHOD("get_drop_section_at_position", "position"), &Tree::get_drop_section_at_position);