[Editor] Add option to override editor UI layout direction.

core/config/project_settings.cpp

@@ -1387,7 +1387,7 @@ ProjectSettings::ProjectSettings() {
 	GLOBAL_DEF_RST(PropertyInfo(Variant::INT, "rendering/occlusion_culling/bvh_build_quality", PROPERTY_HINT_ENUM, "Low,Medium,High"), 2);
 	GLOBAL_DEF(PropertyInfo(Variant::INT, "memory/limits/multithreaded_server/rid_pool_prealloc", PROPERTY_HINT_RANGE, "0,500,1"), 60); // No negative and limit to 500 due to crashes.
 	GLOBAL_DEF_RST("internationalization/rendering/force_right_to_left_layout_direction", false);
-	GLOBAL_DEF_BASIC(PropertyInfo(Variant::INT, "internationalization/rendering/root_node_layout_direction", PROPERTY_HINT_ENUM, "Based on Locale,Left-to-Right,Right-to-Left"), 0);
+	GLOBAL_DEF_BASIC(PropertyInfo(Variant::INT, "internationalization/rendering/root_node_layout_direction", PROPERTY_HINT_ENUM, "Based on Application Locale,Left-to-Right,Right-to-Left,Based on System Locale"), 0);
 
 	GLOBAL_DEF(PropertyInfo(Variant::INT, "gui/timers/incremental_search_max_interval_msec", PROPERTY_HINT_RANGE, "0,10000,1,or_greater"), 2000);
 

doc/classes/EditorSettings.xml

@@ -599,6 +599,9 @@
 		<member name="interface/editor/single_window_mode" type="bool" setter="" getter="">
 			If [code]true[/code], embed modal windows such as docks inside the main editor window. When single-window mode is enabled, tooltips will also be embedded inside the main editor window, which means they can't be displayed outside of the editor window.
 		</member>
+		<member name="interface/editor/ui_layout_direction" type="int" setter="" getter="">
+			Editor UI default layout direction.
+		</member>
 		<member name="interface/editor/unfocused_low_processor_mode_sleep_usec" type="float" setter="" getter="">
 			When the editor window is unfocused, the amount of sleeping between frames when the low-processor usage mode is enabled (in microseconds). Higher values will result in lower CPU/GPU usage, which can improve battery life on laptops (in addition to improving the running project's performance if the editor has to redraw continuously). However, higher values will result in a less responsive editor. The default value is set to limit the editor to 20 FPS when the editor window is unfocused. See also [member interface/editor/low_processor_mode_sleep_usec].
 		</member>

editor/editor_node.cpp

@@ -6909,6 +6909,10 @@ EditorNode::EditorNode() {
 		AcceptDialog::set_swap_cancel_ok(swap_cancel_ok == 2);
 	}
 
+	int ed_root_dir = EDITOR_GET("interface/editor/ui_layout_direction");
+	Control::set_root_layout_direction(ed_root_dir);
+	Window::set_root_layout_direction(ed_root_dir);
+
 	ResourceLoader::set_abort_on_missing_resources(false);
 	ResourceLoader::set_error_notify_func(&EditorNode::add_io_error);
 	ResourceLoader::set_dependency_error_notify_func(&EditorNode::_dependency_error_report);

editor/editor_settings.cpp

@@ -400,6 +400,8 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	const String display_scale_hint_string = vformat("Auto (%d%%),75%%,100%%,125%%,150%%,175%%,200%%,Custom", Math::round(get_auto_display_scale() * 100));
 	EDITOR_SETTING_USAGE(Variant::INT, PROPERTY_HINT_ENUM, "interface/editor/display_scale", 0, display_scale_hint_string, PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
 
+	EDITOR_SETTING_USAGE(Variant::INT, PROPERTY_HINT_ENUM, "interface/editor/ui_layout_direction", 0, "Based on Application Locale,Left-to-Right,Right-to-Left,Based on System Locale", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
+
 	String ed_screen_hints = "Screen With Mouse Pointer:-4,Screen With Keyboard Focus:-3,Primary Screen:-2"; // Note: Main Window Screen:-1 is not used for the main window.
 	for (int i = 0; i < DisplayServer::get_singleton()->get_screen_count(); i++) {
 		ed_screen_hints += ",Screen " + itos(i + 1) + ":" + itos(i);

editor/project_manager.cpp

@@ -2847,6 +2847,10 @@ ProjectManager::ProjectManager() {
 		AcceptDialog::set_swap_cancel_ok(swap_cancel_ok == 2);
 	}
 
+	int pm_root_dir = EDITOR_GET("interface/editor/ui_layout_direction");
+	Control::set_root_layout_direction(pm_root_dir);
+	Window::set_root_layout_direction(pm_root_dir);
+
 	EditorColorMap::create();
 	EditorTheme::initialize();
 	Ref<Theme> theme = create_custom_theme();

scene/gui/control.cpp

@@ -197,6 +197,12 @@ void Control::reparent(Node *p_parent, bool p_keep_global_transform) {
 
 // Editor integration.
 
+int Control::root_layout_direction = 0;
+
+void Control::set_root_layout_direction(int p_root_dir) {
+	root_layout_direction = p_root_dir;
+}
+
 void Control::get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const {
 	ERR_READ_THREAD_GUARD;
 	Node::get_argument_options(p_function, p_idx, r_options);
@@ -3024,10 +3030,35 @@ bool Control::is_layout_rtl() const {
 	if (data.is_rtl_dirty) {
 		const_cast<Control *>(this)->data.is_rtl_dirty = false;
 		if (data.layout_dir == LAYOUT_DIRECTION_INHERITED) {
+#ifdef TOOLS_ENABLED
+			if (is_part_of_edited_scene() && GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
+				const_cast<Control *>(this)->data.is_rtl = true;
+				return data.is_rtl;
+			}
+			if (is_inside_tree()) {
+				Node *edited_scene_root = get_tree()->get_edited_scene_root();
+				if (edited_scene_root == this) {
+					int proj_root_layout_direction = GLOBAL_GET(SNAME("internationalization/rendering/root_node_layout_direction"));
+					if (proj_root_layout_direction == 1) {
+						const_cast<Control *>(this)->data.is_rtl = false;
+					} else if (proj_root_layout_direction == 2) {
+						const_cast<Control *>(this)->data.is_rtl = true;
+					} else if (proj_root_layout_direction == 3) {
+						String locale = OS::get_singleton()->get_locale();
+						const_cast<Control *>(this)->data.is_rtl = TS->is_locale_right_to_left(locale);
+					} else {
+						String locale = TranslationServer::get_singleton()->get_tool_locale();
+						const_cast<Control *>(this)->data.is_rtl = TS->is_locale_right_to_left(locale);
+					}
+					return data.is_rtl;
+				}
+			}
+#else
 			if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
 				const_cast<Control *>(this)->data.is_rtl = true;
 				return data.is_rtl;
 			}
+#endif
 			Node *parent_node = get_parent();
 			while (parent_node) {
 				Control *parent_control = Object::cast_to<Control>(parent_node);
@@ -3044,11 +3075,13 @@ bool Control::is_layout_rtl() const {
 				parent_node = parent_node->get_parent();
 			}
 
-			int root_dir = GLOBAL_GET(SNAME("internationalization/rendering/root_node_layout_direction"));
+			if (root_layout_direction == 1) {
-			if (root_dir == 1) {
 				const_cast<Control *>(this)->data.is_rtl = false;
-			} else if (root_dir == 2) {
+			} else if (root_layout_direction == 2) {
 				const_cast<Control *>(this)->data.is_rtl = true;
+			} else if (root_layout_direction == 3) {
+				String locale = OS::get_singleton()->get_locale();
+				const_cast<Control *>(this)->data.is_rtl = TS->is_locale_right_to_left(locale);
 			} else {
 				String locale = TranslationServer::get_singleton()->get_tool_locale();
 				const_cast<Control *>(this)->data.is_rtl = TS->is_locale_right_to_left(locale);

scene/gui/control.h

@@ -317,6 +317,8 @@ private:
 
 	// Extra properties.
 
+	static int root_layout_direction;
+
 	String get_tooltip_text() const;
 
 protected:
@@ -403,6 +405,8 @@ public:
 
 	// Editor integration.
 
+	static void set_root_layout_direction(int p_root_dir);
+
 	virtual void get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const override;
 	PackedStringArray get_configuration_warnings() const override;
 

scene/main/window.cpp

@@ -40,6 +40,14 @@
 #include "scene/theme/theme_db.h"
 #include "scene/theme/theme_owner.h"
 
+// Editor integration.
+
+int Window::root_layout_direction = 0;
+
+void Window::set_root_layout_direction(int p_root_dir) {
+	root_layout_direction = p_root_dir;
+}
+
 // Dynamic properties.
 
 bool Window::_set(const StringName &p_name, const Variant &p_value) {
@@ -2517,9 +2525,32 @@ Window::LayoutDirection Window::get_layout_direction() const {
 bool Window::is_layout_rtl() const {
 	ERR_READ_THREAD_GUARD_V(false);
 	if (layout_dir == LAYOUT_DIRECTION_INHERITED) {
+#ifdef TOOLS_ENABLED
+		if (is_part_of_edited_scene() && GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
+			return true;
+		}
+		if (is_inside_tree()) {
+			Node *edited_scene_root = get_tree()->get_edited_scene_root();
+			if (edited_scene_root == this) {
+				int proj_root_layout_direction = GLOBAL_GET(SNAME("internationalization/rendering/root_node_layout_direction"));
+				if (proj_root_layout_direction == 1) {
+					return false;
+				} else if (proj_root_layout_direction == 2) {
+					return true;
+				} else if (proj_root_layout_direction == 3) {
+					String locale = OS::get_singleton()->get_locale();
+					return TS->is_locale_right_to_left(locale);
+				} else {
+					String locale = TranslationServer::get_singleton()->get_tool_locale();
+					return TS->is_locale_right_to_left(locale);
+				}
+			}
+		}
+#else
 		if (GLOBAL_GET(SNAME("internationalization/rendering/force_right_to_left_layout_direction"))) {
 			return true;
 		}
+#endif
 		Node *parent_node = get_parent();
 		while (parent_node) {
 			Control *parent_control = Object::cast_to<Control>(parent_node);
@@ -2534,11 +2565,13 @@ bool Window::is_layout_rtl() const {
 			parent_node = parent_node->get_parent();
 		}
 
-		int root_dir = GLOBAL_GET(SNAME("internationalization/rendering/root_node_layout_direction"));
+		if (root_layout_direction == 1) {
-		if (root_dir == 1) {
 			return false;
-		} else if (root_dir == 2) {
+		} else if (root_layout_direction == 2) {
 			return true;
+		} else if (root_layout_direction == 3) {
+			String locale = OS::get_singleton()->get_locale();
+			return TS->is_locale_right_to_left(locale);
 		} else {
 			String locale = TranslationServer::get_singleton()->get_tool_locale();
 			return TS->is_locale_right_to_left(locale);

scene/main/window.h

@@ -234,6 +234,8 @@ private:
 
 	Ref<Shortcut> debugger_stop_shortcut;
 
+	static int root_layout_direction;
+
 protected:
 	virtual Rect2i _popup_adjust_rect() const { return Rect2i(); }
 	virtual void _post_popup() {}
@@ -260,6 +262,8 @@ public:
 		NOTIFICATION_THEME_CHANGED = 32
 	};
 
+	static void set_root_layout_direction(int p_root_dir);
+
 	void set_title(const String &p_title);
 	String get_title() const;
 

scene/register_scene_types.cpp

@@ -454,6 +454,10 @@ void register_scene_types() {
 	AcceptDialog::set_swap_cancel_ok(swap_cancel_ok);
 #endif
 
+	int root_dir = GLOBAL_GET("internationalization/rendering/root_node_layout_direction");
+	Control::set_root_layout_direction(root_dir);
+	Window::set_root_layout_direction(root_dir);
+
 	/* REGISTER ANIMATION */
 	GDREGISTER_CLASS(Tween);
 	GDREGISTER_ABSTRACT_CLASS(Tweener);