Improve scene tiles workflow

editor/plugins/tiles/tile_atlas_view.cpp

@@ -632,7 +632,7 @@ TileAtlasView::TileAtlasView() {
 	panel->add_child(center_container);
 
 	missing_source_label = memnew(Label);
-	missing_source_label->set_text(TTR("No atlas source with a valid texture selected."));
+	missing_source_label->set_text(TTR("The selected atlas source has no valid texture. Assign a texture in the TileSet bottom tab."));
 	center_container->add_child(missing_source_label);
 
 	margin_container = memnew(MarginContainer);

editor/plugins/tiles/tile_map_editor.cpp

@@ -177,7 +177,11 @@ void TileMapEditorTilesPlugin::_update_tile_set_sources_list() {
 		if (scene_collection_source) {
 			texture = tiles_bottom_panel->get_theme_icon(SNAME("PackedScene"), SNAME("EditorIcons"));
 			if (item_text.is_empty()) {
-				item_text = vformat(TTR("Scene Collection Source (ID: %d)"), source_id);
+				if (scene_collection_source->get_scene_tiles_count() > 0) {
+					item_text = vformat(TTR("Scene Collection Source (ID: %d)"), source_id);
+				} else {
+					item_text = vformat(TTR("Empty Scene Collection Source (ID: %d)"), source_id);
+				}
 			}
 		}
 
@@ -398,6 +402,10 @@ void TileMapEditorTilesPlugin::_update_scenes_collection_view() {
 			scene_tiles_list->select(item_index, false);
 		}
 	}
+	if (scene_tiles_list->get_item_count() == 0) {
+		scene_tiles_list->add_item(TTR("The selected scene collection source has no scenes. Add scenes in the TileSet bottom tab."));
+		scene_tiles_list->set_item_disabled(-1, true);
+	}
 
 	// Icon size update.
 	int int_size = int(EDITOR_GET("filesystem/file_dialog/thumbnail_size")) * EDSCALE;

editor/plugins/tiles/tile_set_editor.cpp

@@ -181,7 +181,11 @@ void TileSetEditor::_update_sources_list(int force_selected_id) {
 		if (scene_collection_source) {
 			texture = get_theme_icon(SNAME("PackedScene"), SNAME("EditorIcons"));
 			if (item_text.is_empty()) {
-				item_text = vformat(TTR("Scene Collection Source (ID: %d)"), source_id);
+				if (scene_collection_source->get_scene_tiles_count() > 0) {
+					item_text = vformat(TTR("Scene Collection Source (ID: %d)"), source_id);
+				} else {
+					item_text = vformat(TTR("Empty Scene Collection Source (ID: %d)"), source_id);
+				}
 			}
 		}
 

editor/plugins/tiles/tile_set_scenes_collection_source_editor.cpp

@@ -36,6 +36,7 @@
 #include "editor/editor_scale.h"
 #include "editor/editor_settings.h"
 #include "editor/editor_undo_redo_manager.h"
+#include "editor/gui/editor_file_dialog.h"
 #include "editor/plugins/tiles/tile_set_editor.h"
 
 #include "scene/gui/button.h"
@@ -239,10 +240,26 @@ void TileSetScenesCollectionSourceEditor::_scenes_list_item_activated(int p_inde
 }
 
 void TileSetScenesCollectionSourceEditor::_source_add_pressed() {
+	if (!scene_select_dialog) {
+		scene_select_dialog = memnew(EditorFileDialog);
+		add_child(scene_select_dialog);
+		scene_select_dialog->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
+		scene_select_dialog->connect("file_selected", callable_mp(this, &TileSetScenesCollectionSourceEditor::_scene_file_selected));
+
+		for (const String &E : Vector<String>{ "tscn", "scn" }) {
+			scene_select_dialog->add_filter("*." + E, E.to_upper());
+		}
+	}
+	scene_select_dialog->popup_file_dialog();
+}
+
+void TileSetScenesCollectionSourceEditor::_scene_file_selected(const String &p_path) {
+	Ref<PackedScene> scene = ResourceLoader::load(p_path);
+
 	int scene_id = tile_set_scenes_collection_source->get_next_scene_tile_id();
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 	undo_redo->create_action(TTR("Add a Scene Tile"));
-	undo_redo->add_do_method(tile_set_scenes_collection_source, "create_scene_tile", Ref<PackedScene>(), scene_id);
+	undo_redo->add_do_method(tile_set_scenes_collection_source, "create_scene_tile", scene, scene_id);
 	undo_redo->add_undo_method(tile_set_scenes_collection_source, "remove_scene_tile", scene_id);
 	undo_redo->commit_action();
 	_update_scenes_list();
@@ -323,6 +340,10 @@ void TileSetScenesCollectionSourceEditor::_update_scenes_list() {
 			to_reselect = i;
 		}
 	}
+	if (scene_tiles_list->get_item_count() == 0) {
+		scene_tiles_list->add_item(TTR("Drag and drop scenes here or use the Add button."));
+		scene_tiles_list->set_item_disabled(-1, true);
+	}
 
 	// Reselect if needed.
 	if (to_reselect >= 0) {
@@ -336,7 +357,6 @@ void TileSetScenesCollectionSourceEditor::_update_scenes_list() {
 
 void TileSetScenesCollectionSourceEditor::_notification(int p_what) {
 	switch (p_what) {
-		case NOTIFICATION_ENTER_TREE:
 		case NOTIFICATION_THEME_CHANGED: {
 			scene_tile_add_button->set_icon(get_theme_icon(SNAME("Add"), SNAME("EditorIcons")));
 			scene_tile_delete_button->set_icon(get_theme_icon(SNAME("Remove"), SNAME("EditorIcons")));

editor/plugins/tiles/tile_set_scenes_collection_source_editor.h

@@ -38,6 +38,7 @@
 class Button;
 class ItemList;
 class Label;
+class EditorFileDialog;
 
 class TileSetScenesCollectionSourceEditor : public HBoxContainer {
 	GDCLASS(TileSetScenesCollectionSourceEditor, HBoxContainer);
@@ -114,13 +115,15 @@ class TileSetScenesCollectionSourceEditor : public HBoxContainer {
 	ItemList *scene_tiles_list = nullptr;
 	Button *scene_tile_add_button = nullptr;
 	Button *scene_tile_delete_button = nullptr;
+	EditorFileDialog *scene_select_dialog = nullptr;
 
 	void _tile_set_scenes_collection_source_changed();
 	void _scenes_collection_source_proxy_object_changed(String p_what);
 	void _scene_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, Variant p_ud);
 	void _scenes_list_item_activated(int p_index);
 
 	void _source_add_pressed();
+	void _scene_file_selected(const String &p_path);
 	void _source_delete_pressed();
 
 	// Update methods.

scene/resources/tile_set.cpp

@@ -4867,9 +4867,9 @@ void TileSetScenesCollectionSource::set_scene_tile_scene(int p_id, Ref<PackedSce
 			type = scene_state->get_node_type(0);
 			scene_state = scene_state->get_base_scene_state();
 		}
-		ERR_FAIL_COND_MSG(type.is_empty(), vformat("Invalid PackedScene for TileSetScenesCollectionSource: %s. Could not get the type of the root node.", p_packed_scene->get_path()));
+		ERR_FAIL_COND_EDMSG(type.is_empty(), vformat("Invalid PackedScene for TileSetScenesCollectionSource: %s. Could not get the type of the root node.", p_packed_scene->get_path()));
 		bool extends_correct_class = ClassDB::is_parent_class(type, "CanvasItem");
-		ERR_FAIL_COND_MSG(!extends_correct_class, vformat("Invalid PackedScene for TileSetScenesCollectionSource: %s. Root node should extend CanvasItem. Found %s instead.", p_packed_scene->get_path(), type));
+		ERR_FAIL_COND_EDMSG(!extends_correct_class, vformat("Invalid PackedScene for TileSetScenesCollectionSource: %s. Root node should extend CanvasItem. Found %s instead.", p_packed_scene->get_path(), type));
 
 		scenes[p_id].scene = p_packed_scene;
 	} else {