text: /*************************************************************************/
  /*  editor_sub_scene.cpp                                                 */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "editor_sub_scene.h"
  
  #include "editor/editor_node.h"
  #include "scene/gui/margin_container.h"
  #include "scene/resources/packed_scene.h"
  
  void EditorSubScene::_path_selected(const String &p_path) {
  	path->set_text(p_path);
  	_path_changed(p_path);
  }
  
  void EditorSubScene::_path_changed(const String &p_path) {
  	tree->clear();
  
  	if (scene) {
  		memdelete(scene);
  		scene = nullptr;
  	}
  
  	if (p_path == "") {
  		return;
  	}
  
  	Ref<PackedScene> ps = ResourceLoader::load(p_path, "PackedScene");
  
  	if (ps.is_null()) {
  		return;
  	}
  
  	scene = ps->instance();
  	if (!scene) {
  		return;
  	}
  
  	_fill_tree(scene, nullptr);
  }
  
  void EditorSubScene::_path_browse() {
  	file_dialog->popup_centered_ratio();
  }
  
  void EditorSubScene::_notification(int p_what) {
  	if (p_what == NOTIFICATION_VISIBILITY_CHANGED) {
  		if (is_visible() && scene == nullptr) {
  			_path_browse();
  		}
  	}
  }
  
  void EditorSubScene::_fill_tree(Node *p_node, TreeItem *p_parent) {
  	TreeItem *it = tree->create_item(p_parent);
  	it->set_metadata(0, p_node);
  	it->set_text(0, p_node->get_name());
  	it->set_editable(0, false);
  	it->set_selectable(0, true);
  	it->set_icon(0, EditorNode::get_singleton()->get_object_icon(p_node, "Node"));
  
  	for (int i = 0; i < p_node->get_child_count(); i++) {
  		Node *c = p_node->get_child(i);
  		if (c->get_owner() != scene) {
  			continue;
  		}
  		_fill_tree(c, it);
  	}
  }
  
  void EditorSubScene::_selected_changed() {
  	TreeItem *item = tree->get_selected();
  	ERR_FAIL_COND(!item);
  	Node *n = item->get_metadata(0);
  
  	if (!n || !selection.find(n)) {
  		selection.clear();
  		is_root = false;
  	}
  }
  
  void EditorSubScene::_item_multi_selected(Object *p_object, int p_cell, bool p_selected) {
  	if (!is_root) {
  		TreeItem *item = Object::cast_to<TreeItem>(p_object);
  		ERR_FAIL_COND(!item);
  
  		Node *n = item->get_metadata(0);
  
  		if (!n) {
  			return;
  		}
  		if (p_selected) {
  			if (n == scene) {
  				is_root = true;
  				selection.clear();
  			}
  			selection.push_back(n);
  		} else {
  			List<Node *>::Element *E = selection.find(n);
  
  			if (E) {
  				selection.erase(E);
  			}
  		}
  	}
  }
  
  void EditorSubScene::_remove_selection_child(Node *p_node) {
  	if (p_node->get_child_count() > 0) {
  		for (int i = 0; i < p_node->get_child_count(); i++) {
  			Node *c = p_node->get_child(i);
  			List<Node *>::Element *E = selection.find(c);
  			if (E) {
  				selection.move_to_back(E);
  				selection.pop_back();
  			}
  			if (c->get_child_count() > 0) {
  				_remove_selection_child(c);
  			}
  		}
  	}
  }
  
  void EditorSubScene::ok_pressed() {
  	if (selection.size() <= 0) {
  		return;
  	}
  	for (List<Node *>::Element *E = selection.front(); E; E = E->next()) {
  		Node *c = E->get();
  		_remove_selection_child(c);
  	}
  	emit_signal("subscene_selected");
  	hide();
  	clear();
  }
  
  void EditorSubScene::_reown(Node *p_node, List<Node *> *p_to_reown) {
  	if (p_node == scene) {
  		scene->set_filename("");
  		p_to_reown->push_back(p_node);
  	} else if (p_node->get_owner() == scene) {
  		p_to_reown->push_back(p_node);
  	}
  
  	for (int i = 0; i < p_node->get_child_count(); i++) {
  		Node *c = p_node->get_child(i);
  		_reown(c, p_to_reown);
  	}
  }
  
  void EditorSubScene::move(Node *p_new_parent, Node *p_new_owner) {
  	if (!scene) {
  		return;
  	}
  
  	if (selection.size() <= 0) {
  		return;
  	}
  
  	for (List<Node *>::Element *E = selection.front(); E; E = E->next()) {
  		Node *selnode = E->get();
  		if (!selnode) {
  			return;
  		}
  		List<Node *> to_reown;
  		_reown(selnode, &to_reown);
  		if (selnode != scene) {
  			selnode->get_parent()->remove_child(selnode);
  		}
  
  		p_new_parent->add_child(selnode);
  		for (List<Node *>::Element *F = to_reown.front(); F; F = F->next()) {
  			F->get()->set_owner(p_new_owner);
  		}
  	}
  	if (!is_root) {
  		memdelete(scene);
  	}
  	scene = nullptr;
  	//return selnode;
  }
  
  void EditorSubScene::clear() {
  	path->set_text("");
  	_path_changed("");
  }
  
  void EditorSubScene::_bind_methods() {
  	ClassDB::bind_method(D_METHOD("_path_selected"), &EditorSubScene::_path_selected);
  	ClassDB::bind_method(D_METHOD("_path_changed"), &EditorSubScene::_path_changed);
  	ClassDB::bind_method(D_METHOD("_path_browse"), &EditorSubScene::_path_browse);
  	ClassDB::bind_method(D_METHOD("_item_multi_selected"), &EditorSubScene::_item_multi_selected);
  	ClassDB::bind_method(D_METHOD("_selected_changed"), &EditorSubScene::_selected_changed);
  	ADD_SIGNAL(MethodInfo("subscene_selected"));
  }
  
  EditorSubScene::EditorSubScene() {
  	scene = nullptr;
  	is_root = false;
  
  	set_title(TTR("Select Node(s) to Import"));
  	set_hide_on_ok(false);
  
  	VBoxContainer *vb = memnew(VBoxContainer);
  	add_child(vb);
  	//set_child_rect(vb);
  
  	HBoxContainer *hb = memnew(HBoxContainer);
  	path = memnew(LineEdit);
  	path->connect("text_entered", this, "_path_changed");
  	hb->add_child(path);
  	path->set_h_size_flags(SIZE_EXPAND_FILL);
  	Button *b = memnew(Button);
  	b->set_text(TTR("Browse"));
  	hb->add_child(b);
  	b->connect("pressed", this, "_path_browse");
  	vb->add_margin_child(TTR("Scene Path:"), hb);
  
  	tree = memnew(Tree);
  	tree->set_v_size_flags(SIZE_EXPAND_FILL);
  	vb->add_margin_child(TTR("Import From Node:"), tree, true);
  	tree->set_select_mode(Tree::SELECT_MULTI);
  	tree->connect("multi_selected", this, "_item_multi_selected");
  	//tree->connect("nothing_selected", this, "_deselect_items");
  	tree->connect("cell_selected", this, "_selected_changed");
  
  	tree->connect("item_activated", this, "_ok", make_binds(), CONNECT_DEFERRED);
  
  	file_dialog = memnew(EditorFileDialog);
  	List<String> extensions;
  	ResourceLoader::get_recognized_extensions_for_type("PackedScene", &extensions);
  
  	for (List<String>::Element *E = extensions.front(); E; E = E->next()) {
  		file_dialog->add_filter("*." + E->get());
  	}
  
  	file_dialog->set_mode(EditorFileDialog::MODE_OPEN_FILE);
  	add_child(file_dialog);
  	file_dialog->connect("file_selected", this, "_path_selected");
  }
  