ATTDEF dialog error band and multi-line editor; ATTDISP sets ATTMODE

Validation messages show in the dialogs, the Default value of a multi-line
definition can be edited in the multi-line text editor, "Specify on-screen"
is kept for the session, ATTDISP sets ATTMODE with the reference prompt
instead of changing the definitions, and Insert > Block gets the Edit
Attribute (Single / Multiple) and attribute display lists.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locales/ar-SA/opencadstudio.ftl

@@ -4044,6 +4044,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = إنشاء
     .boolean = عمليات منطقية

locales/bg-BG/opencadstudio.ftl

@@ -4031,6 +4031,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Създаване
     .boolean = Булеви операции

locales/cs-CZ/opencadstudio.ftl

@@ -4029,6 +4029,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Vytvořit
     .boolean = Booleovské operace

locales/de-DE/opencadstudio.ftl

@@ -4030,6 +4030,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Erstellen
     .boolean = Boolesche Operationen

locales/el-GR/opencadstudio.ftl

@@ -4032,6 +4032,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Δημιουργία
     .boolean = Δυαδική πράξη

locales/en-US/opencadstudio.ftl

@@ -4033,6 +4033,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Create
     .boolean = Boolean

locales/es-ES/opencadstudio.ftl

@@ -4032,6 +4032,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Crear
     .boolean = Booleanas

locales/fi-FI/opencadstudio.ftl

@@ -4031,6 +4031,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Luo
     .boolean = Boolen operaatiot

locales/fr-FR/opencadstudio.ftl

@@ -4032,6 +4032,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Créer
     .boolean = Opérations booléennes

locales/hi-IN/opencadstudio.ftl

@@ -4020,6 +4020,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = बनाएँ
     .boolean = बूलियन संक्रियाएँ

locales/hu-HU/opencadstudio.ftl

@@ -4031,6 +4031,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Létrehozás
     .boolean = Logikai műveletek

locales/it-IT/opencadstudio.ftl

@@ -4031,6 +4031,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Crea
     .boolean = Operazioni booleane

locales/ja-JP/opencadstudio.ftl

@@ -4020,6 +4020,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = 作成
     .boolean = ブール演算

locales/ko-KR/opencadstudio.ftl

@@ -4031,6 +4031,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = 생성
     .boolean = 불리언 연산

locales/nl-NL/opencadstudio.ftl

@@ -4030,6 +4030,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Maken
     .boolean = Booleaanse bewerkingen

locales/pl-PL/opencadstudio.ftl

@@ -4031,6 +4031,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Utwórz
     .boolean = Operacje boolowskie

locales/pt-BR/opencadstudio.ftl

@@ -4032,6 +4032,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Criar
     .boolean = Operações booleanas

locales/ru-RU/opencadstudio.ftl

@@ -4033,6 +4033,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = Создание
     .boolean = Булевы операции

locales/tr-TR/opencadstudio.ftl

@@ -3992,6 +3992,15 @@ insert =
     .attdef-define-attributes = Öznitelik Tanımla
     .attdef-manage-attributes = Öznitelikleri Yönet
     .attdef-set-base-point = Taban Noktası Belirle
+    .attdef-attmode-retain = Öznitelik görünümünü koru
+    .attdef-attmode-all = Tüm öznitelikleri göster
+    .attdef-attmode-none = Tüm öznitelikleri gizle
+    .attdef-edit-attribute = Öznitelik Düzenle
+    .attdef-multiline-editor = Çok satırlı düzenleyici
+    .attdef-tag-empty = Etiket boş olamaz.
+    .attdef-tag-spaces = Etiket boşluk içeremez.
+    .attdef-positive = Değer pozitif ve sıfırdan farklı olmalı.
+    .attdef-angle = Geçerli bir sayısal açı veya ikinci nokta gerekir.
 model =
     .create = Oluştur
     .boolean = Boole işlemleri

locales/zh-CN/opencadstudio.ftl

@@ -4015,6 +4015,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = 创建
     .boolean = 布尔运算

locales/zh-TW/opencadstudio.ftl

@@ -4027,6 +4027,15 @@ insert =
     .attdef-define-attributes = Define Attributes
     .attdef-manage-attributes = Manage Attributes
     .attdef-set-base-point = Set Base Point
+    .attdef-attmode-retain = Retain Attribute Display
+    .attdef-attmode-all = Display All Attributes
+    .attdef-attmode-none = Hide All Attributes
+    .attdef-edit-attribute = Edit Attribute
+    .attdef-multiline-editor = Multiline editor
+    .attdef-tag-empty = The tag cannot be empty.
+    .attdef-tag-spaces = The tag may not contain spaces.
+    .attdef-positive = Value must be positive and nonzero.
+    .attdef-angle = Requires valid numeric angle or second point.
 model =
     .create = 建立
     .boolean = 布林運算

src/app/commands/attdef.rs

@@ -46,6 +46,19 @@ impl OpenCADStudio {
                 self.push_ucs_to_cmd(i);
                 Some(Task::none())
             }
+            "ATTMODE0" => self.dispatch_draw("ATTDISP OFF", i),
+            "ATTMODE1" => self.dispatch_draw("ATTDISP NORMAL", i),
+            "ATTMODE2" => self.dispatch_draw("ATTDISP ON", i),
+            "_ATTDEF_VALUE" => {
+                let value = attdef::session().editor_value.take();
+                if let Some(state) = self.attdef_dialog.as_mut() {
+                    if let Some(value) = value {
+                        state.default = value;
+                    }
+                    self.active_modal = Some(crate::app::ModalKind::AttDef);
+                }
+                Some(Task::none())
+            }
             cmd if cmd == "_ATTDEF_PICKED" || cmd.starts_with("_ATTDEF_PICKED ") => {
                 let mut parts = cmd.split_whitespace().skip(1);
                 if let (Some(kind), Some(value), Some(state)) =
@@ -116,10 +129,11 @@ impl OpenCADStudio {
             height: short(defaults.height),
             rotation: "0".into(),
             width: "0".into(),
-            on_screen: true,
+            on_screen: session.on_screen,
             coords: ["0".into(), "0".into(), "0".into()],
             align_below: false,
             can_align_below: session.last.is_some(),
+            error: None,
         });
         drop(session);
         self.tabs[i].active_cmd = None;
@@ -139,6 +153,7 @@ impl OpenCADStudio {
             prompt: a.prompt.clone(),
             default: a.default_value.clone(),
             constant: a.flags.constant,
+            error: None,
         });
         self.active_modal = Some(crate::app::ModalKind::AttDefEdit);
     }
@@ -155,6 +170,7 @@ impl OpenCADStudio {
                         .as_ref(),
                 ),
                 AttdefDialogMsg::EditOk => return self.attdef_edit_ok(i),
+                AttdefDialogMsg::DismissError => edit.error = None,
                 _ => {}
             }
             return Task::none();
@@ -201,30 +217,50 @@ impl OpenCADStudio {
                     .as_ref(),
             ),
             AttdefDialogMsg::Ok => return self.attdef_dialog_ok(i),
+            AttdefDialogMsg::DismissError => state.error = None,
+            AttdefDialogMsg::EditValue => {
+                // The dialog waits while the multi-line editor collects the value.
+                let initial = state.default.clone();
+                let height = state.height.trim().parse::<f64>().ok().filter(|h| *h > 0.0).unwrap_or(2.5);
+                self.active_modal = None;
+                attdef::session().editor_value = None;
+                self.tabs[i].active_cmd = Some(Box::new(attdef::AttdefValueCommand));
+                let pos = self.tabs[i].scene.camera.borrow().target;
+                return self.apply_cmd_result(crate::command::CmdResult::SuspendForMTextInput {
+                    pos,
+                    initial,
+                    height,
+                });
+            }
             _ => {}
         }
         Task::none()
     }
 
+    /// Show a validation message in the dialog; it stays open.
+    fn attdef_dialog_error(&mut self, error: &str) -> Task<Message> {
+        if let Some(state) = self.attdef_dialog.as_mut() {
+            state.error = Some(crate::t!(error).into_owned());
+        }
+        Task::none()
+    }
+
     fn attdef_dialog_ok(&mut self, i: usize) -> Task<Message> {
         let Some(state) = self.attdef_dialog.clone() else {
             return Task::none();
         };
         if let Some(error) = tag_error(&state.tag) {
-            self.command_line.push_error(error);
-            return Task::none();
+            return self.attdef_dialog_error(error);
         }
         let number = |s: &str| s.trim().parse::<f64>().ok().filter(|v| v.is_finite());
         let height = match number(&state.height) {
             Some(v) if v > 0.0 => v,
             _ => {
-                self.command_line.push_error("Value must be positive and nonzero.");
-                return Task::none();
+                return self.attdef_dialog_error("Value must be positive and nonzero.");
             }
         };
         let Some(rotation) = number(&state.rotation) else {
-            self.command_line.push_error("Requires valid numeric angle or second point.");
-            return Task::none();
+            return self.attdef_dialog_error("Requires valid numeric angle or second point.");
         };
         let width = number(&state.width).unwrap_or(0.0).max(0.0);
         let defaults =
@@ -250,6 +286,7 @@ impl OpenCADStudio {
             let mut session = attdef::session();
             session.aflags = spec.aflags;
             session.annotative = spec.annotative;
+            session.on_screen = state.on_screen;
         }
         self.reset_command_start_state(i);
         if state.align_below {
@@ -288,7 +325,9 @@ impl OpenCADStudio {
             return Task::none();
         };
         if let Some(error) = tag_error(&state.tag) {
-            self.command_line.push_error(error);
+            if let Some(edit) = self.attdef_edit.as_mut() {
+                edit.error = Some(crate::t!(error).into_owned());
+            }
             return Task::none();
         }
         self.attdef_edit = None;

src/app/commands/draw.rs

@@ -183,68 +183,32 @@ impl OpenCADStudio {
                 }
             }
 
-            // ATTDISP — control attribute display visibility.
-            // ATTDISP ON   — make all AttributeDefinitions visible
-            // ATTDISP OFF  — make all AttributeDefinitions invisible
-            // ATTDISP NORMAL — restore: show only those without the invisible flag
+            // ATTDISP sets ATTMODE: 0 hides every attribute, 1 shows the
+            // visible ones, 2 shows them all. The definitions are not touched.
             "ATTDISP" => {
-                use crate::command::KeywordCommand;
-                let c = KeywordCommand::new(
-                    "ATTDISP",
-                    "ATTDISP  attribute display  [On / Off / Normal]:",
-                    vec![
-                        ("On", "ON", None),
-                        ("Off", "OFF", None),
-                        ("Normal", "NORMAL", None),
-                    ],
+                let command = crate::modules::draw::draw::attdef::AttdispCommand::new(
+                    self.tabs[i].scene.document.header.attribute_visibility,
                 );
-                self.command_line.push_info(&c.prompt());
-                self.tabs[i].active_cmd = Some(Box::new(c));
+                self.command_line.push_info(&command.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(command));
             }
             cmd if cmd.starts_with("ATTDISP ") => {
-                let sub = cmd.split_whitespace().nth(1).unwrap_or("").to_uppercase();
-                match sub.as_str() {
-                    "ON" | "OFF" | "NORMAL" => {
-                        let handles: Vec<_> = self.tabs[i]
-                            .scene
-                            .document
-                            .entities()
-                            .filter_map(|entity| {
-                                matches!(entity, codec::EntityType::AttributeDefinition(_))
-                                    .then_some(entity.common().handle)
-                            })
-                            .filter(|handle| !self.tabs[i].scene.is_layer_locked(*handle))
-                            .collect();
-                        self.push_undo_snapshot(i, "ATTDISP");
-                        let mut count = 0usize;
-                        for handle in handles {
-                            if let Some(codec::EntityType::AttributeDefinition(ad)) =
-                                self.tabs[i].scene.document.get_entity_mut(handle)
-                            {
-                                match sub.as_str() {
-                                    "ON" => {
-                                        ad.flags.invisible = false;
-                                        count += 1;
-                                    }
-                                    "OFF" => {
-                                        ad.flags.invisible = true;
-                                        count += 1;
-                                    }
-                                    _ => {}
-                                }
-                            }
-                        }
-                        self.tabs[i].dirty = true;
-                        self.command_line.push_output(
-                            crate::tf!("ATTDISP {sub}: {count} attribute definition(s) updated.")
-                                .as_ref(),
-                        );
-                    }
+                let mode = match cmd[8..].trim().to_ascii_uppercase().as_str() {
+                    "OFF" => 0,
+                    "ON" => 2,
+                    "NORMAL" | "N" => 1,
                     _ => {
-                        self.command_line
-                            .push_info(crate::t!("Usage: ATTDISP ON | OFF | NORMAL").as_ref());
+                        self.command_line.push_error("Invalid option keyword.");
+                        return Some(Task::none());
                     }
+                };
+                if self.tabs[i].scene.document.header.attribute_visibility != mode {
+                    self.push_undo_snapshot(i, "ATTDISP");
+                    self.tabs[i].scene.document.header.attribute_visibility = mode;
+                    self.tabs[i].dirty = true;
+                    self.tabs[i].scene.bump_geometry();
                 }
+                self.command_line.push_output("Regenerating model.");
             }
 
             "DONUT" => {

src/app/commands/mod.rs

@@ -666,6 +666,9 @@ inventory::submit!(crate::command::CommandRegistration {
         "POINTCLOUDPOINTMAXLEGACY",
         "XCLIPFRAME",
         "WIPEOUTFRAME",
+        "ATTMODE0",
+        "ATTMODE1",
+        "ATTMODE2",
         "FRAMES0",
         "FRAMES1",
         "FRAMES3",

src/app/update/mod.rs

@@ -344,6 +344,12 @@ impl OpenCADStudio {
             _ => "FRAMES3",
         };
         self.ribbon.set_dropdown_current("FRAMES_DROPDOWN", current);
+        let attmode = match tab.scene.document.header.attribute_visibility {
+            0 => "ATTMODE0",
+            2 => "ATTMODE2",
+            _ => "ATTMODE1",
+        };
+        self.ribbon.set_dropdown_current("ATTMODE_DROPDOWN", attmode);
     }
 
     fn update_message(&mut self, msg: Message) -> Task<Message> {

src/locale_catalog.rs

@@ -175,6 +175,15 @@ pub(super) fn message_attribute(source: &str) -> Option<(&'static str, &'static
         "Define Attributes" => Some(("insert", "attdef-define-attributes")),
         "Manage Attributes" => Some(("insert", "attdef-manage-attributes")),
         "Set Base Point" => Some(("insert", "attdef-set-base-point")),
+        "Retain Attribute Display" => Some(("insert", "attdef-attmode-retain")),
+        "Display All Attributes" => Some(("insert", "attdef-attmode-all")),
+        "Hide All Attributes" => Some(("insert", "attdef-attmode-none")),
+        "Edit Attribute" => Some(("insert", "attdef-edit-attribute")),
+        "Multiline editor" => Some(("insert", "attdef-multiline-editor")),
+        "The tag cannot be empty." => Some(("insert", "attdef-tag-empty")),
+        "The tag may not contain spaces." => Some(("insert", "attdef-tag-spaces")),
+        "Value must be positive and nonzero." => Some(("insert", "attdef-positive")),
+        "Requires valid numeric angle or second point." => Some(("insert", "attdef-angle")),
         "Stylization" => Some(("properties", "stylization")),
         "Color scheme" => Some(("properties", "color-scheme")),
         "Scan Colors" => Some(("properties", "scan-colors")),

src/modules/draw/draw/attdef.rs

@@ -32,12 +32,18 @@ pub struct AttdefSession {
     pub aflags: u8,
     pub annotative: bool,
     pub last: Option<AttributeDefinition>,
+    /// The dialog's "Specify on-screen" choice, kept for the session.
+    pub on_screen: bool,
+    /// Text the multi-line editor handed back to the dialog's Default field.
+    pub editor_value: Option<String>,
 }
 
 pub static SESSION: Mutex<AttdefSession> = Mutex::new(AttdefSession {
     aflags: AFLAG_LOCK,
     annotative: false,
     last: None,
+    on_screen: true,
+    editor_value: None,
 });
 
 pub fn session() -> std::sync::MutexGuard<'static, AttdefSession> {
@@ -1046,3 +1052,92 @@ impl CadCommand for AttdefPickCommand {
         CmdResult::Dispatch("_ATTDEF_PICKED".into())
     }
 }
+
+/// ATTDISP: `Enter attribute visibility setting [Normal/ON/OFF] <current>:`.
+/// Hands the chosen setting back as `ATTDISP <word>`; Enter keeps the current
+/// one.
+pub struct AttdispCommand {
+    current: &'static str,
+}
+
+impl AttdispCommand {
+    /// `mode` is ATTMODE: 0 OFF, 1 Normal, 2 ON.
+    pub fn new(mode: i16) -> Self {
+        Self { current: attdisp_word(mode) }
+    }
+}
+
+/// The ATTDISP keyword for an ATTMODE value.
+pub fn attdisp_word(mode: i16) -> &'static str {
+    match mode {
+        0 => "OFF",
+        2 => "ON",
+        _ => "Normal",
+    }
+}
+
+impl CadCommand for AttdispCommand {
+    fn name(&self) -> &'static str {
+        "ATTDISP"
+    }
+
+    fn prompt(&self) -> String {
+        format!("Enter attribute visibility setting [Normal/ON/OFF] <{}>:", self.current)
+    }
+
+    fn input_kind(&self) -> InputKind {
+        InputKind::SingleToken
+    }
+
+    fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
+        let word = text.trim().trim_start_matches('_').to_ascii_uppercase();
+        if word.is_empty() {
+            return Some(self.on_enter());
+        }
+        let mode = match word.as_str() {
+            "N" | "NORMAL" => "NORMAL",
+            "ON" => "ON",
+            "OF" | "OFF" => "OFF",
+            _ => return Some(CmdResult::ReportError("Invalid option keyword.".into())),
+        };
+        Some(CmdResult::Dispatch(format!("ATTDISP {mode}")))
+    }
+
+    fn on_point(&mut self, _pt: DVec3) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        CmdResult::Cancel
+    }
+}
+
+/// The dialog's "…" button: the default value is edited in the multi-line
+/// text editor, then handed back to the dialog (`_ATTDEF_VALUE`).
+pub struct AttdefValueCommand;
+
+impl CadCommand for AttdefValueCommand {
+    fn name(&self) -> &'static str {
+        "ATTDEF"
+    }
+
+    fn prompt(&self) -> String {
+        String::new()
+    }
+
+    fn on_point(&mut self, _pt: DVec3) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_enter(&mut self) -> CmdResult {
+        CmdResult::NeedPoint
+    }
+
+    fn on_editor_text(&mut self, value: String) {
+        session().editor_value = Some(value);
+    }
+
+    fn on_editor_closed(&mut self, _committed: bool) -> CmdResult {
+        CmdResult::Dispatch("_ATTDEF_VALUE".into())
+    }
+}

src/modules/insert/mod.rs

@@ -105,7 +105,28 @@ impl CadModule for InsertModule {
                     tools: vec![
                         RibbonItem::LargeTool(mview_block::tool()),
                         RibbonItem::LargeTool(insert_block::tool()),
-                        RibbonItem::LargeTool(attedit::tool()),
+                        RibbonItem::LabeledDropdown {
+                            id: "ATTEDIT_DROPDOWN",
+                            label: "Edit Attribute",
+                            icon: attedit::ICON,
+                            items: vec![
+                                ("ATTEDIT", "Single", attedit::ICON),
+                                ("-ATTEDIT", "Multiple", attedit::ICON),
+                            ],
+                            default: "ATTEDIT",
+                        },
+                        // ATTMODE: the face shows the drawing's current setting.
+                        RibbonItem::LabeledDropdown {
+                            id: "ATTMODE_DROPDOWN",
+                            label: "",
+                            icon: attedit::ICON,
+                            items: vec![
+                                ("ATTMODE1", "Retain Attribute Display", attedit::ICON),
+                                ("ATTMODE2", "Display All Attributes", attedit::ICON),
+                                ("ATTMODE0", "Hide All Attributes", attedit::ICON),
+                            ],
+                            default: "ATTMODE1",
+                        },
                     ],
                 },
                 // ── Block Definition (slide-out: Set Base Point, Synchronize) ─────

src/ui/window/attdef_dialog.rs

@@ -34,6 +34,9 @@ pub enum AttdefDialogMsg {
     PickHeight,
     PickRotation,
     PickWidth,
+    /// Edit the default value in the multi-line text editor.
+    EditValue,
+    DismissError,
     Ok,
     Help,
     EditTag(String),
@@ -71,6 +74,8 @@ pub struct AttdefDialogState {
     pub align_below: bool,
     /// A definition was placed before in this session.
     pub can_align_below: bool,
+    /// Validation message shown above the buttons.
+    pub error: Option<String>,
 }
 
 /// The Edit Attribute Definition dialog's fields.
@@ -81,6 +86,7 @@ pub struct AttdefEditState {
     pub prompt: String,
     pub default: String,
     pub constant: bool,
+    pub error: Option<String>,
 }
 
 fn msg(m: AttdefDialogMsg) -> Message {
@@ -131,6 +137,36 @@ fn mode<'a>(label: String, on: bool, bit: u8) -> Element<'a, Message> {
         .into()
 }
 
+/// The validation message band, as in the Write Block dialog.
+fn error_band<'a>(error: &Option<String>) -> Option<Element<'a, Message>> {
+    let error = error.clone()?;
+    Some(
+        container(
+            row![
+                crate::ui::icons::semantic(ICON_WARN, 14.0),
+                text(error).size(11),
+                Space::new().width(Fill),
+                button(text("×").size(12))
+                    .on_press(msg(AttdefDialogMsg::DismissError))
+                    .style(button_style(false))
+                    .padding([1, 6]),
+            ]
+            .spacing(8)
+            .align_y(iced::Center),
+        )
+        .padding([6, 10])
+        .width(Fill)
+        .style(|theme: &iced::Theme| container::Style {
+            background: Some(iced::Background::Color(theme.palette().danger.base.color.scale_alpha(0.18))),
+            border: iced::Border { radius: 4.0.into(), ..Default::default() },
+            ..Default::default()
+        })
+        .into(),
+    )
+}
+
+static ICON_WARN: &[u8] = include_bytes!("../../../assets/icons/ui/warning_triangle.svg");
+
 fn footer<'a>(action: std::borrow::Cow<'static, str>, ok: AttdefDialogMsg) -> Element<'a, Message> {
     row![
         button(text("?").size(12))
@@ -194,11 +230,18 @@ pub fn view<'a>(state: &'a AttdefDialogState, sizing: crate::ui::modal::ModalSiz
             ),
             labelled(
                 if constant { t!("Value") } else { t!("Default") }.into_owned(),
-                row![
-                    input(&state.default, true, AttdefDialogMsg::Default),
+                {
+                    let mut value = row![input(&state.default, true, AttdefDialogMsg::Default)].spacing(6);
+                    if multiline {
+                        value = value.push(pick(
+                            "…",
+                            t!("Multiline editor").into_owned(),
+                            Some(AttdefDialogMsg::EditValue),
+                        ));
+                    }
                     // No field picker in this application yet.
-                    pick("ƒ", t!("Insert field").into_owned(), None),
-                ]
+                    value.push(pick("ƒ", t!("Insert field").into_owned(), None))
+                }
                 .spacing(6)
                 .into(),
                 true
@@ -295,7 +338,12 @@ pub fn view<'a>(state: &'a AttdefDialogState, sizing: crate::ui::modal::ModalSiz
         column![attribute, settings].spacing(10).width(Fill),
     ]
     .spacing(10);
-    column![body, align, footer(t!("Define"), AttdefDialogMsg::Ok)]
+    let mut content = column![body, align];
+    if let Some(band) = error_band(&state.error) {
+        content = content.push(band);
+    }
+    content
+        .push(footer(t!("Define"), AttdefDialogMsg::Ok))
         .spacing(10)
         .padding([10, 12])
         .width(sizing.width)
@@ -331,7 +379,12 @@ pub fn view_edit<'a>(state: &'a AttdefEditState, sizing: crate::ui::modal::Modal
         ]
         .spacing(8),
     );
-    column![content, footer(t!("Apply"), AttdefDialogMsg::EditOk)]
+    let mut content = column![content];
+    if let Some(band) = error_band(&state.error) {
+        content = content.push(band);
+    }
+    content
+        .push(footer(t!("Apply"), AttdefDialogMsg::EditOk))
         .spacing(10)
         .padding([10, 12])
         .width(sizing.width)