Rework the TileSet resource and TileMap nodes:

- Move most properties from TileMap to TileSet,
- Make TileSet more flexible, supporting more feature (several
  collision layers, etc...),
- Fusion both the TileMap and TileSet editor,
- Implement TileSetSources, and thus a new way to index tiles in the TileSet,
- Rework the TileSet and TileMap editors completely,
- Implement an editor zoom widget (and use it in several places)

1 files changed, 520 insertions, 0 deletions

diff --git a/editor/plugins/tiles/tile_set_editor.cpp b/editor/plugins/tiles/tile_set_editor.cpp
new file mode 100644
index 0000000000..8a5890e9a4
--- /dev/null
+++ b/editor/plugins/tiles/tile_set_editor.cpp
@@ -0,0 +1,520 @@
+/*************************************************************************/
+/*  tile_set_editor.cpp                                                  */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 "tile_set_editor.h"
+
+#include "tile_data_editors.h"
+#include "tiles_editor_plugin.h"
+
+#include "editor/editor_scale.h"
+
+#include "scene/gui/box_container.h"
+#include "scene/gui/control.h"
+#include "scene/gui/tab_container.h"
+
+TileSetEditor *TileSetEditor::singleton = nullptr;
+
+void TileSetEditor::drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) {
+	ERR_FAIL_COND(!tile_set.is_valid());
+
+	if (!can_drop_data_fw(p_point, p_data, p_from)) {
+		return;
+	}
+
+	if (p_from == sources_list) {
+		// Handle dropping a texture in the list of atlas resources.
+		int source_id = -1;
+		int added = 0;
+		Dictionary d = p_data;
+		Vector<String> files = d["files"];
+		for (int i = 0; i < files.size(); i++) {
+			Ref<Texture2D> resource = ResourceLoader::load(files[i]);
+			if (resource.is_valid()) {
+				// Retrieve the id for the next created source.
+				source_id = tile_set->get_next_source_id();
+
+				// Actually create the new source.
+				Ref<TileSetAtlasSource> atlas_source = memnew(TileSetAtlasSource);
+				atlas_source->set_texture(resource);
+				undo_redo->create_action(TTR("Add a new atlas source"));
+				undo_redo->add_do_method(*tile_set, "add_source", atlas_source, source_id);
+				undo_redo->add_do_method(*atlas_source, "set_texture_region_size", tile_set->get_tile_size());
+				undo_redo->add_undo_method(*tile_set, "remove_source", source_id);
+				undo_redo->commit_action();
+				added += 1;
+			}
+		}
+
+		if (added == 1) {
+			tile_set_atlas_source_editor->init_source();
+		}
+
+		// Update the selected source (thus trigerring an update).
+		_update_atlas_sources_list(source_id);
+	}
+}
+
+bool TileSetEditor::can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const {
+	ERR_FAIL_COND_V(!tile_set.is_valid(), false);
+
+	if (p_from == sources_list) {
+		Dictionary d = p_data;
+
+		if (!d.has("type")) {
+			return false;
+		}
+
+		// Check if we have a Texture2D.
+		if (String(d["type"]) == "files") {
+			Vector<String> files = d["files"];
+
+			if (files.size() == 0) {
+				return false;
+			}
+
+			for (int i = 0; i < files.size(); i++) {
+				String file = files[i];
+				String ftype = EditorFileSystem::get_singleton()->get_file_type(file);
+
+				if (!ClassDB::is_parent_class(ftype, "Texture2D")) {
+					return false;
+				}
+			}
+
+			return true;
+		}
+	}
+	return false;
+}
+
+void TileSetEditor::_update_atlas_sources_list(int force_selected_id) {
+	ERR_FAIL_COND(!tile_set.is_valid());
+
+	// Get the previously selected id.
+	int old_selected = -1;
+	if (sources_list->get_current() >= 0) {
+		int source_id = sources_list->get_item_metadata(sources_list->get_current());
+		if (tile_set->has_source(source_id)) {
+			old_selected = source_id;
+		}
+	}
+
+	int to_select = -1;
+	if (force_selected_id >= 0) {
+		to_select = force_selected_id;
+	} else if (old_selected >= 0) {
+		to_select = old_selected;
+	}
+
+	// Clear the list.
+	sources_list->clear();
+
+	// Update the atlas sources.
+	for (int i = 0; i < tile_set->get_source_count(); i++) {
+		int source_id = tile_set->get_source_id(i);
+
+		// TODO: handle with virtual functions
+		TileSetSource *source = *tile_set->get_source(source_id);
+		TileSetAtlasSource *atlas_source = Object::cast_to<TileSetAtlasSource>(source);
+		if (atlas_source) {
+			Ref<Texture2D> texture = atlas_source->get_texture();
+			if (texture.is_valid()) {
+				sources_list->add_item(vformat("%s - (id:%d)", texture->get_path().get_file(), source_id), texture);
+			} else {
+				sources_list->add_item(vformat("No texture atlas source - (id:%d)", source_id), missing_texture_texture);
+			}
+		} else {
+			sources_list->add_item(vformat("Unknown type source - (id:%d)", source_id), missing_texture_texture);
+		}
+		sources_list->set_item_metadata(sources_list->get_item_count() - 1, source_id);
+	}
+
+	// Set again the current selected item if needed.
+	if (to_select >= 0) {
+		for (int i = 0; i < sources_list->get_item_count(); i++) {
+			if ((int)sources_list->get_item_metadata(i) == to_select) {
+				sources_list->set_current(i);
+				if (old_selected != to_select) {
+					sources_list->emit_signal("item_selected", sources_list->get_current());
+				}
+				break;
+			}
+		}
+	}
+
+	// If nothing is selected, select the first entry.
+	if (sources_list->get_current() < 0 && sources_list->get_item_count() > 0) {
+		sources_list->set_current(0);
+		if (old_selected != int(sources_list->get_item_metadata(0))) {
+			sources_list->emit_signal("item_selected", sources_list->get_current());
+		}
+	}
+
+	// If there is no source left, hide all editors and show the label.
+	_source_selected(sources_list->get_current());
+
+	// Synchronize the lists.
+	TilesEditor::get_singleton()->set_atlas_sources_lists_current(sources_list->get_current());
+}
+
+void TileSetEditor::_source_selected(int p_source_index) {
+	ERR_FAIL_COND(!tile_set.is_valid());
+
+	// Update the selected source.
+	sources_delete_button->set_disabled(p_source_index < 0);
+
+	if (p_source_index >= 0) {
+		int source_id = sources_list->get_item_metadata(p_source_index);
+		TileSetAtlasSource *atlas_source = Object::cast_to<TileSetAtlasSource>(*tile_set->get_source(source_id));
+		if (atlas_source) {
+			tile_set_atlas_source_editor->edit(*tile_set, atlas_source, source_id);
+			no_source_selected_label->hide();
+			tile_set_atlas_source_editor->show();
+		} else {
+			no_source_selected_label->show();
+			tile_set_atlas_source_editor->hide();
+		}
+	} else {
+		no_source_selected_label->show();
+		tile_set_atlas_source_editor->hide();
+	}
+}
+
+void TileSetEditor::_source_add_pressed() {
+	ERR_FAIL_COND(!tile_set.is_valid());
+
+	int source_id = tile_set->get_next_source_id();
+
+	Ref<TileSetAtlasSource> atlas_source = memnew(TileSetAtlasSource);
+
+	// Add a new source.
+	undo_redo->create_action(TTR("Add atlas source"));
+	undo_redo->add_do_method(*tile_set, "add_source", atlas_source, source_id);
+	undo_redo->add_do_method(*atlas_source, "set_texture_region_size", tile_set->get_tile_size());
+	undo_redo->add_undo_method(*tile_set, "remove_source", source_id);
+	undo_redo->commit_action();
+
+	_update_atlas_sources_list(source_id);
+}
+
+void TileSetEditor::_source_delete_pressed() {
+	ERR_FAIL_COND(!tile_set.is_valid());
+
+	// Update the selected source.
+	int to_delete = sources_list->get_item_metadata(sources_list->get_current());
+
+	Ref<TileSetSource> source = tile_set->get_source(to_delete);
+
+	// Remove the source.
+	undo_redo->create_action(TTR("Remove source"));
+	undo_redo->add_do_method(*tile_set, "remove_source", to_delete);
+	undo_redo->add_undo_method(*tile_set, "add_source", source, to_delete);
+	undo_redo->commit_action();
+
+	_update_atlas_sources_list();
+}
+
+void TileSetEditor::_notification(int p_what) {
+	switch (p_what) {
+		case NOTIFICATION_ENTER_TREE:
+		case NOTIFICATION_THEME_CHANGED:
+			sources_delete_button->set_icon(get_theme_icon("Remove", "EditorIcons"));
+			sources_add_button->set_icon(get_theme_icon("Add", "EditorIcons"));
+			missing_texture_texture = get_theme_icon("TileSet", "EditorIcons");
+			break;
+		case NOTIFICATION_INTERNAL_PROCESS:
+			if (tile_set_changed_needs_update) {
+				_update_atlas_sources_list();
+				tile_set_changed_needs_update = false;
+			}
+			break;
+		default:
+			break;
+	}
+}
+
+void TileSetEditor::_tile_set_changed() {
+	tile_set_changed_needs_update = true;
+}
+
+void TileSetEditor::_undo_redo_inspector_callback(Object *p_undo_redo, Object *p_edited, String p_property, Variant p_new_value) {
+	UndoRedo *undo_redo = Object::cast_to<UndoRedo>(p_undo_redo);
+	ERR_FAIL_COND(!undo_redo);
+
+#define ADD_UNDO(obj, property) undo_redo->add_undo_property(obj, property, tile_data->get(property));
+	TileSet *tile_set = Object::cast_to<TileSet>(p_edited);
+	if (tile_set) {
+		Vector<String> components = p_property.split("/", true, 3);
+		for (int i = 0; i < tile_set->get_source_count(); i++) {
+			int source_id = tile_set->get_source_id(i);
+
+			Ref<TileSetAtlasSource> tas = tile_set->get_source(source_id);
+			if (tas.is_valid()) {
+				for (int j = 0; j < tas->get_tiles_count(); j++) {
+					Vector2i tile_id = tas->get_tile_id(j);
+					for (int k = 0; k < tas->get_alternative_tiles_count(tile_id); k++) {
+						int alternative_id = tas->get_alternative_tile_id(tile_id, k);
+						TileData *tile_data = Object::cast_to<TileData>(tas->get_tile_data(tile_id, alternative_id));
+						ERR_FAIL_COND(!tile_data);
+
+						if (p_property == "occlusion_layers_count") {
+							int new_layer_count = p_new_value;
+							int old_layer_count = tile_set->get_occlusion_layers_count();
+							if (new_layer_count < old_layer_count) {
+								for (int occclusion_layer_index = new_layer_count - 1; occclusion_layer_index < old_layer_count; occclusion_layer_index++) {
+									ADD_UNDO(tile_data, vformat("occlusion_layer_%d/polygon", occclusion_layer_index));
+								}
+							}
+						} else if (p_property == "physics_layers_count") {
+							int new_layer_count = p_new_value;
+							int old_layer_count = tile_set->get_physics_layers_count();
+							if (new_layer_count < old_layer_count) {
+								for (int physics_layer_index = new_layer_count - 1; physics_layer_index < old_layer_count; physics_layer_index++) {
+									ADD_UNDO(tile_data, vformat("physics_layer_%d/shapes_count", physics_layer_index));
+									for (int shape_index = 0; shape_index < tile_data->get_collision_shapes_count(physics_layer_index); shape_index++) {
+										ADD_UNDO(tile_data, vformat("physics_layer_%d/shape_%d/shape", physics_layer_index, shape_index));
+										ADD_UNDO(tile_data, vformat("physics_layer_%d/shape_%d/one_way", physics_layer_index, shape_index));
+										ADD_UNDO(tile_data, vformat("physics_layer_%d/shape_%d/one_way_margin", physics_layer_index, shape_index));
+									}
+								}
+							}
+						} else if ((p_property == "terrains_sets_count" && tile_data->get_terrain_set() >= (int)p_new_value) ||
+								   (components.size() == 2 && components[0].begins_with("terrain_set_") && components[0].trim_prefix("terrain_set_").is_valid_integer() && components[1] == "mode") ||
+								   (components.size() == 2 && components[0].begins_with("terrain_set_") && components[0].trim_prefix("terrain_set_").is_valid_integer() && components[1] == "terrains_count" && tile_data->get_terrain_set() == components[0].trim_prefix("terrain_set_").to_int() && (int)p_new_value < tile_set->get_terrains_count(tile_data->get_terrain_set()))) {
+							ADD_UNDO(tile_data, "terrain_set");
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_RIGHT_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/right_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_RIGHT_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/right_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_BOTTOM_RIGHT_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/bottom_right_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_BOTTOM_RIGHT_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/bottom_right_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_BOTTOM_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/bottom_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_BOTTOM_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/bottom_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_BOTTOM_LEFT_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/bottom_left_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_BOTTOM_LEFT_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/bottom_left_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_LEFT_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/left_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_LEFT_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/left_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_TOP_LEFT_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/top_left_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_TOP_LEFT_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/top_left_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_TOP_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/top_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_TOP_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/top_corner");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_TOP_RIGHT_SIDE)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/top_right_side");
+							}
+							if (tile_data->is_valid_peering_bit_terrain(TileSet::CELL_NEIGHBOR_TOP_RIGHT_CORNER)) {
+								ADD_UNDO(tile_data, "terrains_peering_bit/top_right_corner");
+							}
+						} else if (p_property == "navigation_layers_count") {
+							int new_layer_count = p_new_value;
+							int old_layer_count = tile_set->get_navigation_layers_count();
+							if (new_layer_count < old_layer_count) {
+								for (int navigation_layer_index = new_layer_count - 1; navigation_layer_index < old_layer_count; navigation_layer_index++) {
+									ADD_UNDO(tile_data, vformat("navigation_layer_%d/polygon", navigation_layer_index));
+								}
+							}
+						} else if (p_property == "custom_data_layers_count") {
+							int new_layer_count = p_new_value;
+							int old_layer_count = tile_set->get_custom_data_layers_count();
+							if (new_layer_count < old_layer_count) {
+								for (int custom_data_layer_index = new_layer_count - 1; custom_data_layer_index < old_layer_count; custom_data_layer_index++) {
+									ADD_UNDO(tile_data, vformat("custom_data_%d", custom_data_layer_index));
+								}
+							}
+						} else if (components.size() == 2 && components[0].begins_with("custom_data_layer_") && components[0].trim_prefix("custom_data_layer_").is_valid_integer() && components[1] == "type") {
+							int custom_data_layer = components[0].trim_prefix("custom_data_layer_").is_valid_integer();
+							ADD_UNDO(tile_data, vformat("custom_data_%d", custom_data_layer));
+						}
+					}
+				}
+			}
+		}
+	}
+#undef ADD_UNDO
+}
+
+void TileSetEditor::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("can_drop_data_fw"), &TileSetEditor::can_drop_data_fw);
+	ClassDB::bind_method(D_METHOD("drop_data_fw"), &TileSetEditor::drop_data_fw);
+}
+
+TileDataEditor *TileSetEditor::get_tile_data_editor(String p_property) {
+	Vector<String> components = String(p_property).split("/", true);
+
+	if (p_property == "z_index") {
+		return tile_data_integer_editor;
+	} else if (p_property == "probability") {
+		return tile_data_float_editor;
+	} else if (p_property == "y_sort_origin") {
+		return tile_data_position_editor;
+	} else if (p_property == "texture_offset") {
+		return tile_data_texture_offset_editor;
+	} else if (components.size() >= 1 && components[0].begins_with("occlusion_layer_")) {
+		return tile_data_occlusion_shape_editor;
+	} else if (components.size() >= 1 && components[0].begins_with("physics_layer_")) {
+		return tile_data_collision_shape_editor;
+	} else if (p_property == "mode" || p_property == "terrain" || (components.size() >= 1 && components[0] == "terrains_peering_bit")) {
+		return tile_data_terrains_editor;
+	} else if (components.size() >= 1 && components[0].begins_with("navigation_layer_")) {
+		return tile_data_navigation_polygon_editor;
+	}
+
+	return nullptr;
+}
+
+void TileSetEditor::edit(Ref<TileSet> p_tile_set) {
+	if (p_tile_set == tile_set) {
+		return;
+	}
+
+	// Remove listener.
+	if (tile_set.is_valid()) {
+		tile_set->disconnect("changed", callable_mp(this, &TileSetEditor::_tile_set_changed));
+	}
+
+	// Change the edited object.
+	tile_set = p_tile_set;
+
+	// Add the listener again.
+	if (tile_set.is_valid()) {
+		tile_set->connect("changed", callable_mp(this, &TileSetEditor::_tile_set_changed));
+		_update_atlas_sources_list();
+	}
+
+	tile_set_atlas_source_editor->hide();
+	no_source_selected_label->show();
+}
+
+TileSetEditor::TileSetEditor() {
+	singleton = this;
+
+	set_process_internal(true);
+
+	// Split container.
+	HSplitContainer *split_container = memnew(HSplitContainer);
+	split_container->set_name(TTR("Tiles"));
+	split_container->set_h_size_flags(SIZE_EXPAND_FILL);
+	split_container->set_v_size_flags(SIZE_EXPAND_FILL);
+	add_child(split_container);
+
+	// Sources list.
+	VBoxContainer *split_container_left_side = memnew(VBoxContainer);
+	split_container_left_side->set_h_size_flags(SIZE_EXPAND_FILL);
+	split_container_left_side->set_v_size_flags(SIZE_EXPAND_FILL);
+	split_container_left_side->set_stretch_ratio(0.25);
+	split_container_left_side->set_custom_minimum_size(Size2i(70, 0) * EDSCALE);
+	split_container->add_child(split_container_left_side);
+
+	sources_list = memnew(ItemList);
+	sources_list->set_fixed_icon_size(Size2i(60, 60) * EDSCALE);
+	sources_list->set_h_size_flags(SIZE_EXPAND_FILL);
+	sources_list->set_v_size_flags(SIZE_EXPAND_FILL);
+	sources_list->connect("item_selected", callable_mp(this, &TileSetEditor::_source_selected));
+	sources_list->connect("item_selected", callable_mp(TilesEditor::get_singleton(), &TilesEditor::set_atlas_sources_lists_current));
+	sources_list->connect("visibility_changed", callable_mp(TilesEditor::get_singleton(), &TilesEditor::synchronize_atlas_sources_list), varray(sources_list));
+	sources_list->set_drag_forwarding(this);
+	split_container_left_side->add_child(sources_list);
+
+	HBoxContainer *sources_bottom_actions = memnew(HBoxContainer);
+	sources_bottom_actions->set_alignment(HBoxContainer::ALIGN_END);
+	split_container_left_side->add_child(sources_bottom_actions);
+
+	sources_delete_button = memnew(Button);
+	sources_delete_button->set_flat(true);
+	sources_delete_button->set_disabled(true);
+	sources_delete_button->connect("pressed", callable_mp(this, &TileSetEditor::_source_delete_pressed));
+	sources_bottom_actions->add_child(sources_delete_button);
+
+	sources_add_button = memnew(Button);
+	sources_add_button->set_flat(true);
+	sources_add_button->connect("pressed", callable_mp(this, &TileSetEditor::_source_add_pressed));
+	sources_bottom_actions->add_child(sources_add_button);
+
+	// No source selected.
+	no_source_selected_label = memnew(Label);
+	no_source_selected_label->set_text(TTR("No TileSet source selected. Select or create a TileSet source."));
+	no_source_selected_label->set_h_size_flags(SIZE_EXPAND_FILL);
+	no_source_selected_label->set_v_size_flags(SIZE_EXPAND_FILL);
+	no_source_selected_label->set_align(Label::ALIGN_CENTER);
+	no_source_selected_label->set_valign(Label::VALIGN_CENTER);
+	split_container->add_child(no_source_selected_label);
+
+	// Atlases editor.
+	tile_set_atlas_source_editor = memnew(TileSetAtlasSourceEditor);
+	tile_set_atlas_source_editor->set_h_size_flags(SIZE_EXPAND_FILL);
+	tile_set_atlas_source_editor->set_v_size_flags(SIZE_EXPAND_FILL);
+	tile_set_atlas_source_editor->connect("source_id_changed", callable_mp(this, &TileSetEditor::_update_atlas_sources_list));
+	split_container->add_child(tile_set_atlas_source_editor);
+	tile_set_atlas_source_editor->hide();
+
+	// Registers UndoRedo inspector callback.
+	EditorNode::get_singleton()->get_editor_data().add_undo_redo_inspector_hook_callback(callable_mp(this, &TileSetEditor::_undo_redo_inspector_callback));
+}
+
+TileSetEditor::~TileSetEditor() {
+	if (tile_set.is_valid()) {
+		tile_set->disconnect("changed", callable_mp(this, &TileSetEditor::_tile_set_changed));
+	}
+
+	// Delete tile data editors.
+	memdelete(tile_data_texture_offset_editor);
+	memdelete(tile_data_position_editor);
+	memdelete(tile_data_integer_editor);
+	memdelete(tile_data_float_editor);
+	memdelete(tile_data_occlusion_shape_editor);
+	memdelete(tile_data_collision_shape_editor);
+	memdelete(tile_data_terrains_editor);
+	memdelete(tile_data_navigation_polygon_editor);
+}