feat(plot): page setup manager — named setups, layouts, <none>/<previous>

Restructure the plot dialog into a style-manager-style master/detail: a
left list of page setups plus a right settings editor. The list shows
<none> (defaults + PDF) and <previous> (the settings the dialog opened
with), then the drawing's layouts (*Model*, *Layout1*, …) and its
standalone named page setups.

- Named page setups live in the ACAD_PLOTSETTINGS dictionary
  (src/scene/page_setup.rs: names/get/save/delete/rename, creating the
  dictionary if absent); DWG round-trip verified.
- Toolbar New / Copy / Delete | Set current / Preview / Print. Selecting
  a row loads it into the editor; Set current writes to the active
  layout. Copy duplicates a layout or a setup into a new named setup;
  Delete/Rename apply only to named setups.
- Scene::plot_settings_for(name) generalizes effective_plot_settings so
  any layout's settings can be loaded; on open the settings are
  snapshotted for <previous>.
- Default selection: model space → <none>; a layout → its own setup.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/app/mod.rs

@@ -521,6 +521,9 @@ pub(super) struct OpenCADStudio {
     plot_orientation: crate::io::paper_sizes::Orientation,
     /// Backing state for the full Plot / Print dialog.
     plot_dialog: crate::ui::window::plot::PlotDialogState,
+    /// Snapshot of the dialog's settings taken when it opened, restored by the
+    /// `<previous>` list entry.
+    plot_prev: Option<crate::ui::window::plot::PlotDialogState>,
 
     // ── Plot Style Table ──────────────────────────────────────────────────
     /// Currently loaded CTB/STB table (None = no override).
@@ -2140,6 +2143,7 @@ impl OpenCADStudio {
             plot_format: crate::io::paper_sizes::PaperSize::A4,
             plot_orientation: crate::io::paper_sizes::Orientation::Landscape,
             plot_dialog: crate::ui::window::plot::PlotDialogState::load(),
+            plot_prev: None,
             opening: None,
             pending_close: None,
             save_dialog_format: "DWG 2018".to_string(),

src/app/update/file.rs

@@ -1253,6 +1253,19 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
             let deg = ps.rotation.to_degrees() as i32;
             d.rotation = format!("{deg}°");
         }
+        self.plot_dialog.name_input = None;
+        self.plot_dialog.name_rename = false;
+        // Refresh the list (<none> / <previous> / layouts / named setups) and
+        // snapshot the just-loaded settings as the `<previous>` restore point.
+        self.refresh_page_setups();
+        self.plot_prev = Some(self.plot_dialog.clone());
+        // Default selection: model space → <none>; a layout → its own setup.
+        let cur = self.tabs[self.active_tab].scene.current_layout.clone();
+        if cur == "Model" {
+            self.select_page_setup(crate::ui::window::plot::SETUP_NONE);
+        } else {
+            self.select_page_setup(&format!("*{cur}*"));
+        }
         self.active_modal = Some(crate::app::ModalKind::Plot);
         Task::none()
     }
@@ -1350,17 +1363,255 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
                 self.close_active_modal();
                 Task::done(Message::Command("PLOTWINDOW".into()))
             }
+            M::SelectSetup(name) => {
+                self.select_page_setup(&name);
+                Task::none()
+            }
+            M::SetCurrent => {
+                self.apply_dialog_to_layout();
+                self.command_line.push_info("Page setup applied to the layout.");
+                Task::none()
+            }
+            M::NewSetup => {
+                // Create a setup from the current editor values, then start an
+                // inline rename so the user can name it.
+                let name = self.next_page_setup_name("Setup");
+                let ps = self.dialog_to_plotsettings();
+                self.tabs[self.active_tab].scene.page_setup_save(&name, ps);
+                self.tabs[self.active_tab].dirty = true;
+                self.plot_dialog.selected_setup = name.clone();
+                self.refresh_page_setups();
+                self.plot_dialog.name_input = Some(name);
+                self.plot_dialog.name_rename = true;
+                Task::none()
+            }
+            M::CopySetup => {
+                // Duplicate the selected entry — a layout OR a named setup —
+                // into a new standalone named page setup.
+                let sel = self.plot_dialog.selected_setup.clone();
+                let scene = &self.tabs[self.active_tab].scene;
+                let (src_ps, base) = if is_layout_entry(&sel) {
+                    let ln = layout_entry_name(&sel);
+                    (scene.plot_settings_for(ln), format!("{ln} copy"))
+                } else {
+                    (scene.page_setup_get(&sel), format!("{sel} copy"))
+                };
+                if let Some(ps) = src_ps {
+                    let name = self.next_page_setup_name(&base);
+                    self.tabs[self.active_tab].scene.page_setup_save(&name, ps);
+                    self.tabs[self.active_tab].dirty = true;
+                    self.plot_dialog.selected_setup = name.clone();
+                    self.refresh_page_setups();
+                    self.plot_dialog.name_input = Some(name);
+                    self.plot_dialog.name_rename = true;
+                }
+                Task::none()
+            }
+            M::RenameStart(name) => {
+                // Only standalone named setups can be renamed.
+                if is_layout_entry(&name) || is_special_entry(&name) {
+                    return Task::none();
+                }
+                self.plot_dialog.selected_setup = name.clone();
+                if let Some(ps) = self.tabs[self.active_tab].scene.page_setup_get(&name) {
+                    self.load_plotsettings_into_dialog(&ps);
+                }
+                self.plot_dialog.name_input = Some(name);
+                self.plot_dialog.name_rename = true;
+                Task::none()
+            }
+            M::DeleteSetup => {
+                let sel = self.plot_dialog.selected_setup.clone();
+                if !sel.is_empty() && !is_layout_entry(&sel) {
+                    self.tabs[self.active_tab].scene.page_setup_delete(&sel);
+                    self.tabs[self.active_tab].dirty = true;
+                    self.plot_dialog.selected_setup.clear();
+                    self.refresh_page_setups();
+                }
+                Task::none()
+            }
+            M::NameInput(s) => {
+                self.plot_dialog.name_input = Some(s);
+                Task::none()
+            }
+            M::NameCommit => {
+                if let Some(name) = self.plot_dialog.name_input.take() {
+                    let name = name.trim().to_string();
+                    if !name.is_empty() {
+                        if self.plot_dialog.name_rename {
+                            let old = self.plot_dialog.selected_setup.clone();
+                            self.tabs[self.active_tab].scene.page_setup_rename(&old, &name);
+                        } else {
+                            let ps = self.dialog_to_plotsettings();
+                            self.tabs[self.active_tab].scene.page_setup_save(&name, ps);
+                        }
+                        self.tabs[self.active_tab].dirty = true;
+                        self.plot_dialog.selected_setup = name;
+                        self.refresh_page_setups();
+                    }
+                }
+                self.plot_dialog.name_rename = false;
+                Task::none()
+            }
+            M::NameCancel => {
+                self.plot_dialog.name_input = None;
+                self.plot_dialog.name_rename = false;
+                Task::none()
+            }
             M::Preview => self.on_plot_dlg_commit(true),
             M::Commit => self.on_plot_dlg_commit(false),
         }
     }
 
-    /// Apply the dialog's page settings to the layout, then either open a
-    /// preview PDF, export a PDF, or send the job to the chosen printer.
-    fn on_plot_dlg_commit(&mut self, preview: bool) -> Task<Message> {
+    fn refresh_page_setups(&mut self) {
+        use crate::ui::window::plot::{SETUP_NONE, SETUP_PREV};
+        let scene = &self.tabs[self.active_tab].scene;
+        // <none> / <previous>, then layouts (`*name*`), then named setups.
+        let mut list = vec![SETUP_NONE.to_string(), SETUP_PREV.to_string()];
+        list.extend(scene.layout_names().into_iter().map(|n| format!("*{n}*")));
+        list.extend(scene.page_setup_names());
+        self.plot_dialog.page_setups = list;
+    }
+
+    /// Apply a page-setup list selection to the editor. Handles the pseudo
+    /// entries (`<none>` / `<previous>`), layout rows (`*name*`) and named
+    /// setups.
+    fn select_page_setup(&mut self, name: &str) {
+        use crate::ui::window::plot::{SETUP_NONE, SETUP_PREV};
+        self.plot_dialog.selected_setup = name.to_string();
+        if name == SETUP_NONE {
+            // No page setup: default geometry + PDF output.
+            let is_model = self.tabs[self.active_tab].scene.current_layout == "Model";
+            let d = &mut self.plot_dialog;
+            d.to_file = true;
+            d.paper = "A4".into();
+            d.orientation = "Landscape".into();
+            d.area = if is_model { "Window".into() } else { "Layout".into() };
+            d.center = true;
+            d.offset_x = "0.0".into();
+            d.offset_y = "0.0".into();
+            d.rotation = "0°".into();
+            d.scale = "Fit".into();
+        } else if name == SETUP_PREV {
+            if let Some(prev) = self.plot_prev.clone() {
+                self.plot_dialog.copy_settings_from(&prev);
+            }
+        } else if is_layout_entry(name) {
+            if let Some(ps) = self
+                .tabs[self.active_tab]
+                .scene
+                .plot_settings_for(layout_entry_name(name))
+            {
+                self.load_plotsettings_into_dialog(&ps);
+            }
+        } else if let Some(ps) = self.tabs[self.active_tab].scene.page_setup_get(name) {
+            self.load_plotsettings_into_dialog(&ps);
+        }
+    }
+
+    /// A page-setup name based on `base` that isn't already taken (`base`,
+    /// `base 2`, `base 3`, …).
+    fn next_page_setup_name(&self, base: &str) -> String {
+        let existing = self.tabs[self.active_tab].scene.page_setup_names();
+        if !existing.iter().any(|n| n == base) {
+            return base.to_string();
+        }
+        (2..)
+            .map(|i| format!("{base} {i}"))
+            .find(|c| !existing.iter().any(|n| n == c))
+            .unwrap_or_else(|| base.to_string())
+    }
+
+    /// Build a `PlotSettings` from the current dialog fields (for saving a named
+    /// page setup).
+    fn dialog_to_plotsettings(&self) -> acadrust::objects::PlotSettings {
+        use acadrust::objects::{
+            PlotPaperUnits, PlotRotation, PlotSettings, PlotType, ScaledType,
+        };
+        use crate::io::paper_sizes::{sheet_mm, Orientation, PaperSize};
+        let d = &self.plot_dialog;
+        let paper = match d.paper.as_str() {
+            "A3" => PaperSize::A3,
+            "A2" => PaperSize::A2,
+            "A1" => PaperSize::A1,
+            "A0" => PaperSize::A0,
+            _ => PaperSize::A4,
+        };
+        let orient = if d.orientation == "Portrait" {
+            Orientation::Portrait
+        } else {
+            Orientation::Landscape
+        };
+        let (w, h) = sheet_mm(paper, orient);
+        let mut ps = PlotSettings::new("");
+        ps.paper_width = w;
+        ps.paper_height = h;
+        ps.paper_units = PlotPaperUnits::Millimeters;
+        ps.plot_type = match d.area.as_str() {
+            "Window" => PlotType::Window,
+            "Layout" => PlotType::Layout,
+            _ => PlotType::Extents,
+        };
+        ps.flags.plot_centered = d.center;
+        ps.origin_x = d.offset_x.parse::<f64>().unwrap_or(0.0);
+        ps.origin_y = d.offset_y.parse::<f64>().unwrap_or(0.0);
+        let rot: i16 = d.rotation.trim_end_matches('°').parse().unwrap_or(0);
+        ps.rotation = match rot {
+            90 => PlotRotation::Degrees90,
+            180 => PlotRotation::Degrees180,
+            270 => PlotRotation::Degrees270,
+            _ => PlotRotation::None,
+        };
+        if d.scale == "Fit" {
+            ps.set_scale_to_fit();
+        } else {
+            let (num, den) = parse_plot_scale(&d.scale);
+            ps.scale_type = ScaledType::CustomScale;
+            ps.scale_numerator = num;
+            ps.scale_denominator = den;
+        }
+        ps.printer_name = d.printer.clone().unwrap_or_default();
+        ps.current_style_sheet = d.style_name.clone();
+        ps
+    }
+
+    /// Load a `PlotSettings` into the dialog editor fields.
+    fn load_plotsettings_into_dialog(&mut self, ps: &acadrust::objects::PlotSettings) {
+        use acadrust::objects::PlotType;
+        let (paper, orient) = paper_label_from_dims(ps.paper_width, ps.paper_height);
+        let d = &mut self.plot_dialog;
+        d.paper = paper;
+        d.orientation = orient;
+        d.area = match ps.plot_type {
+            PlotType::Window => "Window",
+            PlotType::Layout => "Layout",
+            _ => "Extents",
+        }
+        .to_string();
+        d.center = ps.flags.plot_centered;
+        d.offset_x = format!("{:.2}", ps.origin_x);
+        d.offset_y = format!("{:.2}", ps.origin_y);
+        let deg = ps.rotation.to_degrees() as i32;
+        d.rotation = format!("{deg}°");
+        d.scale = if ps.is_scale_to_fit() {
+            "Fit".into()
+        } else {
+            let n = ps.scale_numerator;
+            let m = ps.scale_denominator;
+            if (n - 1.0).abs() < 1e-9 {
+                format!("1:{}", m as i64)
+            } else if (m - 1.0).abs() < 1e-9 {
+                format!("{}:1", n as i64)
+            } else {
+                "Fit".into()
+            }
+        };
+    }
+
+    /// Write the current dialog fields into the active layout's plot settings.
+    /// Shared by the "Set current" action and the print/export commit.
+    fn apply_dialog_to_layout(&mut self) {
         use crate::io::paper_sizes::{sheet_mm, Orientation, PaperSize};
-        // Remember the user's print preferences across sessions.
-        self.plot_dialog.save();
         let d = self.plot_dialog.clone();
         let paper = match d.paper.as_str() {
             "A3" => PaperSize::A3,
@@ -1375,9 +1626,6 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
             Orientation::Landscape
         };
         let (sheet_w, sheet_h) = sheet_mm(paper, orient);
-        // Persist the dialog's page settings into the layout's PlotSettings /
-        // paper_limits, then reuse the tested layout-plot derivation. `plot_scale`
-        // feeds the model-space window plot path.
         self.plot_format = paper;
         self.plot_orientation = orient;
         self.plot_scale = d.scale.clone();
@@ -1388,6 +1636,17 @@ pub(super) fn on_open_file(&mut self) -> Task<Message> {
         self.apply_plot_page_settings(
             sheet_w, sheet_h, extents, d.center, off_x, off_y, rotation, &d.scale,
         );
+    }
+
+    /// Apply the dialog's page settings to the layout, then either open a
+    /// preview PDF, export a PDF, or send the job to the chosen printer.
+    fn on_plot_dlg_commit(&mut self, preview: bool) -> Task<Message> {
+        // Remember the user's print preferences across sessions.
+        self.plot_dialog.save();
+        let d = self.plot_dialog.clone();
+        // Persist the dialog's page settings into the layout, then reuse the
+        // tested layout-plot derivation.
+        self.apply_dialog_to_layout();
         self.active_modal = None;
 
         let plot_style = if d.with_styles {

src/app/update/util.rs

@@ -39,6 +39,39 @@ fn format_annotation_scale_name(anno: f32) -> String {
     }
 }
 
+/// `<none>` / `<previous>` are pseudo-entries, not real page setups.
+pub(super) fn is_special_entry(s: &str) -> bool {
+    s == crate::ui::window::plot::SETUP_NONE || s == crate::ui::window::plot::SETUP_PREV
+}
+
+/// A page-setup list entry wrapped in `*…*` is a layout (its embedded page
+/// setup), not a standalone named page setup.
+pub(super) fn is_layout_entry(s: &str) -> bool {
+    s.len() >= 2 && s.starts_with('*') && s.ends_with('*')
+}
+
+/// The layout name inside a `*name*` list entry.
+pub(super) fn layout_entry_name(s: &str) -> &str {
+    s.trim_start_matches('*').trim_end_matches('*')
+}
+
+/// Infer the closest A-series paper label and orientation from sheet
+/// dimensions (mm). Falls back to A4 when nothing is close.
+pub(super) fn paper_label_from_dims(w: f64, h: f64) -> (String, String) {
+    use crate::io::paper_sizes::PaperSize;
+    let orient = if w >= h { "Landscape" } else { "Portrait" };
+    let (short, long) = if w <= h { (w, h) } else { (h, w) };
+    let mut best = ("A4".to_string(), f64::INFINITY);
+    for p in PaperSize::ALL {
+        let (pw, ph) = p.dimensions_mm(); // portrait: pw < ph
+        let err = (pw - short).abs() + (ph - long).abs();
+        if err < best.1 {
+            best = (p.label().to_string(), err);
+        }
+    }
+    (best.0, orient.to_string())
+}
+
 pub(super) fn parse_plot_scale(s: &str) -> (f64, f64) {
     if s == "Fit" {
         return (1.0, 1.0);

src/app/view/mod.rs

@@ -1466,7 +1466,7 @@ impl OpenCADStudio {
             PluginManager => (520, 460),
             UpdateNotice => (560, 460),
             Layers => (900, 360),
-            Plot => (660, 540),
+            Plot => (760, 540),
             LayoutManager => (640, 320),
             Plotstyle => (780, 540),
             TextStyle => (860, 480),

src/app/view/modal.rs

@@ -48,7 +48,7 @@ impl OpenCADStudio {
                 sized(tab.layers.view_window(), 900, 360)
             }
             super::super::ModalKind::Plot => {
-                sized(crate::ui::window::plot::view_window(&self.plot_dialog), 660, 540)
+                sized(crate::ui::window::plot::view_window(&self.plot_dialog), 760, 540)
             }
             super::super::ModalKind::LayoutManager => {
                 let i = self.active_tab;

src/scene/mod.rs

@@ -21,6 +21,7 @@ mod camera_ops;
 mod layout;
 mod modify;
 mod mspace;
+mod page_setup;
 mod paper;
 mod preview;
 mod project;
@@ -1677,14 +1678,20 @@ impl Scene {
     /// AutoCAD files keep their settings embedded, so without this fallback the
     /// plot/PDF path would ignore the file's rotation, origin and scale.
     pub fn effective_plot_settings(&self) -> Option<acadrust::objects::PlotSettings> {
+        self.plot_settings_for(&self.current_layout)
+    }
+
+    /// Plot settings for a specific layout by name: its standalone
+    /// `PlotSettings` object if one exists, else synthesized from the `Layout`
+    /// object's embedded fields.
+    pub fn plot_settings_for(&self, name: &str) -> Option<acadrust::objects::PlotSettings> {
         use acadrust::objects::{
             ObjectType, PaperMargin, PlotPaperUnits, PlotRotation, PlotSettings, PlotType,
             PlotWindow, ScaledType,
         };
-        let name = &self.current_layout;
         if let Some(ps) = self.document.objects.values().find_map(|o| {
             if let ObjectType::PlotSettings(ps) = o {
-                if &ps.page_name == name {
+                if ps.page_name.as_str() == name {
                     return Some(ps.clone());
                 }
             }
@@ -1694,7 +1701,7 @@ impl Scene {
         }
         self.document.objects.values().find_map(|o| {
             let ObjectType::Layout(l) = o else { return None };
-            if &l.name != name {
+            if l.name.as_str() != name {
                 return None;
             }
             let mut ps = PlotSettings::new(l.name.clone());

src/scene/page_setup.rs

@@ -0,0 +1,126 @@
+//! Named page setups — the reusable plot configurations a drawing stores in
+//! its `ACAD_PLOTSETTINGS` dictionary (each a standalone `PlotSettings` object
+//! keyed by name). These are distinct from a layout's own embedded plot
+//! settings: a named setup can be applied to any layout. CRUD here keeps the
+//! dictionary + objects consistent so the result round-trips through DWG/DXF.
+
+use super::Scene;
+use acadrust::objects::{Dictionary, ObjectType, PlotSettings};
+use acadrust::Handle;
+
+impl Scene {
+    /// Names of the document's named page setups, in dictionary order.
+    pub fn page_setup_names(&self) -> Vec<String> {
+        let dh = self.document.header.acad_plotsettings_dict_handle;
+        match self.document.objects.get(&dh) {
+            Some(ObjectType::Dictionary(d)) => d.entries.iter().map(|(k, _)| k.clone()).collect(),
+            _ => Vec::new(),
+        }
+    }
+
+    /// Clone the named page setup's `PlotSettings`, or `None` if absent.
+    pub fn page_setup_get(&self, name: &str) -> Option<PlotSettings> {
+        let dh = self.document.header.acad_plotsettings_dict_handle;
+        let ObjectType::Dictionary(d) = self.document.objects.get(&dh)? else {
+            return None;
+        };
+        let h = d.entries.iter().find(|(k, _)| k == name).map(|(_, h)| *h)?;
+        match self.document.objects.get(&h)? {
+            ObjectType::PlotSettings(ps) => Some(ps.clone()),
+            _ => None,
+        }
+    }
+
+    /// Handle of the `ACAD_PLOTSETTINGS` dictionary, creating it (and its entry
+    /// in the root named-objects dictionary) if the drawing has none yet.
+    fn ensure_plotsettings_dict(&mut self) -> Handle {
+        let dh = self.document.header.acad_plotsettings_dict_handle;
+        if matches!(self.document.objects.get(&dh), Some(ObjectType::Dictionary(_))) {
+            return dh;
+        }
+        let root = self.document.header.named_objects_dict_handle;
+        let mut dict = Dictionary::new();
+        dict.handle = self.document.allocate_handle();
+        dict.owner = root;
+        let new_handle = dict.handle;
+        self.document
+            .objects
+            .insert(new_handle, ObjectType::Dictionary(dict));
+        self.document.header.acad_plotsettings_dict_handle = new_handle;
+        if let Some(ObjectType::Dictionary(rd)) = self.document.objects.get_mut(&root) {
+            rd.entries.retain(|(k, _)| k != "ACAD_PLOTSETTINGS");
+            rd.entries.push(("ACAD_PLOTSETTINGS".to_string(), new_handle));
+        }
+        new_handle
+    }
+
+    /// Handle of the named page setup, if it exists.
+    fn page_setup_handle(&self, name: &str) -> Option<Handle> {
+        let dh = self.document.header.acad_plotsettings_dict_handle;
+        let ObjectType::Dictionary(d) = self.document.objects.get(&dh)? else {
+            return None;
+        };
+        d.entries.iter().find(|(k, _)| k == name).map(|(_, h)| *h)
+    }
+
+    /// Create or update the named page setup from `ps` (its `page_name` and
+    /// `owner` are set here). Existing entries are updated in place; new ones
+    /// are inserted and registered in the dictionary.
+    pub fn page_setup_save(&mut self, name: &str, mut ps: PlotSettings) {
+        let dict_handle = self.ensure_plotsettings_dict();
+        ps.page_name = name.to_string();
+        ps.owner = dict_handle;
+        if let Some(h) = self.page_setup_handle(name) {
+            ps.handle = h;
+            self.document.objects.insert(h, ObjectType::PlotSettings(ps));
+        } else {
+            ps.handle = self.document.allocate_handle();
+            let h = ps.handle;
+            self.document.objects.insert(h, ObjectType::PlotSettings(ps));
+            if let Some(ObjectType::Dictionary(d)) = self.document.objects.get_mut(&dict_handle) {
+                d.entries.push((name.to_string(), h));
+            }
+        }
+    }
+
+    /// Remove the named page setup (object + dictionary entry). No-op if absent.
+    pub fn page_setup_delete(&mut self, name: &str) {
+        let dict_handle = self.document.header.acad_plotsettings_dict_handle;
+        let handle = if let Some(ObjectType::Dictionary(d)) =
+            self.document.objects.get_mut(&dict_handle)
+        {
+            let h = d.entries.iter().find(|(k, _)| k == name).map(|(_, h)| *h);
+            d.entries.retain(|(k, _)| k != name);
+            h
+        } else {
+            None
+        };
+        if let Some(h) = handle {
+            self.document.objects.remove(&h);
+        }
+    }
+
+    /// Rename a named page setup (dictionary key + the object's `page_name`).
+    /// No-op if `old` is absent or `new` already exists.
+    pub fn page_setup_rename(&mut self, old: &str, new: &str) {
+        if old == new || new.trim().is_empty() {
+            return;
+        }
+        if self.page_setup_handle(new).is_some() {
+            return; // name collision
+        }
+        let dict_handle = self.document.header.acad_plotsettings_dict_handle;
+        let mut renamed = None;
+        if let Some(ObjectType::Dictionary(d)) = self.document.objects.get_mut(&dict_handle) {
+            if let Some(e) = d.entries.iter_mut().find(|(k, _)| k == old) {
+                e.0 = new.to_string();
+                renamed = Some(e.1);
+            }
+        }
+        if let Some(h) = renamed {
+            if let Some(ObjectType::PlotSettings(ps)) = self.document.objects.get_mut(&h) {
+                ps.page_name = new.to_string();
+            }
+        }
+    }
+}

src/ui/window/plot.rs

@@ -7,7 +7,8 @@
 use crate::app::Message;
 use crate::io::paper_sizes::PaperSize;
 use iced::widget::{
-    button, checkbox, column, container, pick_list, row, scrollable, text, text_input, Space,
+    button, checkbox, column, container, mouse_area, pick_list, row, scrollable, text, text_input,
+    Space,
 };
 use iced::{Background, Border, Color, Element, Fill, Length, Theme};
 
@@ -18,11 +19,18 @@ const TEXT: Color = Color { r: 0.88, g: 0.88, b: 0.88, a: 1.0 };
 const DIM: Color = Color { r: 0.55, g: 0.55, b: 0.55, a: 1.0 };
 const ACCENT: Color = Color { r: 0.25, g: 0.50, b: 0.85, a: 1.0 };
 const FIELD: Color = Color { r: 0.10, g: 0.10, b: 0.10, a: 1.0 };
+const ACTIVE: Color = Color { r: 0.20, g: 0.40, b: 0.70, a: 1.0 };
+const LIST: Color = Color { r: 0.12, g: 0.12, b: 0.12, a: 1.0 };
 
 /// Sentinel entries in the printer dropdown (not real printer names).
 pub const OUT_DEFAULT: &str = "System default printer";
 pub const OUT_PDF: &str = "Save to PDF file…";
 
+/// Top-of-list entries: no page setup (defaults + PDF), and the last-used
+/// settings captured when the dialog opened.
+pub const SETUP_NONE: &str = "<none>";
+pub const SETUP_PREV: &str = "<previous>";
+
 /// One of the many boolean plot options (folded into a single message so the
 /// dialog needn't carry a variant per checkbox).
 #[derive(Debug, Clone, Copy)]
@@ -62,6 +70,25 @@ pub enum PlotDlgMsg {
     LoadStyle,
     ClearStyle,
     PickWindow,
+    // ── Named page-setup manager ─────────────────────────────────────────
+    /// Pick a named page setup (loads its values into the editor).
+    SelectSetup(String),
+    /// Write the current editor values into the active layout.
+    SetCurrent,
+    /// Create a new named page setup from the current editor values.
+    NewSetup,
+    /// Duplicate the selected page setup.
+    CopySetup,
+    /// Begin an inline rename of the given page setup row.
+    RenameStart(String),
+    /// Delete the selected named page setup.
+    DeleteSetup,
+    /// Live edit of the new/rename name field.
+    NameInput(String),
+    /// Confirm the new/rename name.
+    NameCommit,
+    /// Cancel the new/rename name row.
+    NameCancel,
 }
 
 /// Transient state backing the Plot dialog. Seeded from the layout's plot
@@ -98,6 +125,14 @@ pub struct PlotDialogState {
     pub save_layout: bool,
     /// Display name of the active plot style table ("" = none).
     pub style_name: String,
+    /// Named page setups in the document (refreshed when the dialog opens).
+    pub page_setups: Vec<String>,
+    /// Currently selected named page setup ("" = none / current layout).
+    pub selected_setup: String,
+    /// When `Some`, a name-entry row is showing (for New / Rename).
+    pub name_input: Option<String>,
+    /// `true` when `name_input` is renaming the selected setup, else creating.
+    pub name_rename: bool,
 }
 
 impl Default for PlotDialogState {
@@ -128,11 +163,45 @@ impl Default for PlotDialogState {
             stamp: false,
             save_layout: false,
             style_name: String::new(),
+            page_setups: Vec::new(),
+            selected_setup: String::new(),
+            name_input: None,
+            name_rename: false,
         }
     }
 }
 
 impl PlotDialogState {
+    /// Copy the plot-setting fields (paper, scale, output options, …) from
+    /// `o`, leaving list / rename / runtime UI state untouched. Used to restore
+    /// the `<previous>` snapshot.
+    pub fn copy_settings_from(&mut self, o: &PlotDialogState) {
+        self.printer = o.printer.clone();
+        self.to_file = o.to_file;
+        self.paper = o.paper.clone();
+        self.orientation = o.orientation.clone();
+        self.rotation = o.rotation.clone();
+        self.copies = o.copies.clone();
+        self.area = o.area.clone();
+        self.center = o.center;
+        self.offset_x = o.offset_x.clone();
+        self.offset_y = o.offset_y.clone();
+        self.scale = o.scale.clone();
+        self.scale_lw = o.scale_lw;
+        self.quality = o.quality.clone();
+        self.dpi = o.dpi.clone();
+        self.shade = o.shade.clone();
+        self.mono = o.mono;
+        self.lineweights = o.lineweights;
+        self.with_styles = o.with_styles;
+        self.transparency = o.transparency;
+        self.paperspace_last = o.paperspace_last;
+        self.hide_paperspace = o.hide_paperspace;
+        self.stamp = o.stamp;
+        self.save_layout = o.save_layout;
+        self.style_name = o.style_name.clone();
+    }
+
     /// Load the persisted print preferences (printer, copies, quality, output
     /// options) from `<config>/OpenCADStudio/plot.txt`. Drawing-specific fields
     /// (paper, scale, offset, rotation…) are NOT persisted here — they are
@@ -271,6 +340,50 @@ fn section_label<'a>(s: &'static str) -> Element<'a, Message> {
     text(s).size(11).color(DIM).into()
 }
 
+fn vsep<'a>() -> Element<'a, Message> {
+    container(Space::new().width(1).height(Fill))
+        .width(1)
+        .height(Fill)
+        .style(|_: &Theme| container::Style {
+            background: Some(Background::Color(BORDER)),
+            ..Default::default()
+        })
+        .into()
+}
+
+/// One row in the page-setup list: a selectable name, or an inline rename field
+/// when this row is being renamed.
+fn setup_row<'a>(
+    name: &'a str,
+    selected: &str,
+    renaming: Option<&str>,
+    rename_buf: &'a str,
+) -> Element<'a, Message> {
+    if renaming == Some(name) {
+        return text_input("", rename_buf)
+            .on_input(|v| Message::PlotDlg(PlotDlgMsg::NameInput(v)))
+            .on_submit(Message::PlotDlg(PlotDlgMsg::NameCommit))
+            .style(field_style)
+            .size(11)
+            .padding([4, 8])
+            .width(Fill)
+            .into();
+    }
+    let is_sel = name == selected;
+    let cell = container(text(name.to_string()).size(11).color(TEXT))
+        .padding([4, 8])
+        .width(Fill)
+        .style(move |_: &Theme| container::Style {
+            background: is_sel.then_some(Background::Color(ACTIVE)),
+            text_color: Some(TEXT),
+            ..Default::default()
+        });
+    mouse_area(cell)
+        .on_press(Message::PlotDlg(PlotDlgMsg::SelectSetup(name.to_string())))
+        .on_double_click(Message::PlotDlg(PlotDlgMsg::RenameStart(name.to_string())))
+        .into()
+}
+
 /// A `label : dropdown` row. `ctor` turns the picked string into a dialog
 /// message.
 fn drop_row<'a>(
@@ -326,22 +439,52 @@ fn strs(items: &[&str]) -> Vec<String> {
 pub fn view_window(s: &PlotDialogState) -> Element<'_, Message> {
     // ── Toolbar: Cancel … Preview  Print/Export ──────────────────────────
     let action = if s.to_file { "Export PDF" } else { "Print" };
+    // `<none>` / `<previous>` are pseudo-entries; layout rows are `*name*`.
+    let is_special = s.selected_setup == SETUP_NONE || s.selected_setup == SETUP_PREV;
+    let sel_is_layout = s.selected_setup.len() >= 2
+        && s.selected_setup.starts_with('*')
+        && s.selected_setup.ends_with('*');
+    let can_copy = !s.selected_setup.is_empty() && !is_special;
+    let is_named = can_copy && !sel_is_layout;
+    let mut left_bar = row![button(text("New").size(11))
+        .on_press(Message::PlotDlg(PlotDlgMsg::NewSetup))
+        .style(btn(false))
+        .padding([4, 12])]
+    .spacing(4);
+    if can_copy {
+        left_bar = left_bar.push(
+            button(text("Copy").size(11))
+                .on_press(Message::PlotDlg(PlotDlgMsg::CopySetup))
+                .style(btn(false))
+                .padding([4, 12]),
+        );
+    }
+    if is_named {
+        left_bar = left_bar.push(
+            button(text("Delete").size(11))
+                .on_press(Message::PlotDlg(PlotDlgMsg::DeleteSetup))
+                .style(btn(false))
+                .padding([4, 12]),
+        );
+    }
     let toolbar = container(
         row![
-            button(text("Cancel").size(12))
-                .on_press(Message::PlotDlg(PlotDlgMsg::Close))
-                .style(btn(false))
-                .padding([4, 14]),
+            left_bar,
             Space::new().width(Fill),
-            button(text("Preview").size(12))
+            button(text("Set current").size(11))
+                .on_press(Message::PlotDlg(PlotDlgMsg::SetCurrent))
+                .style(btn(false))
+                .padding([4, 12]),
+            Space::new().width(6),
+            button(text("Preview").size(11))
                 .on_press(Message::PlotDlg(PlotDlgMsg::Preview))
                 .style(btn(false))
                 .padding([4, 12]),
-            Space::new().width(8),
-            button(text(action).size(12))
+            Space::new().width(6),
+            button(text(action).size(11))
                 .on_press(Message::PlotDlg(PlotDlgMsg::Commit))
                 .style(btn(true))
-                .padding([4, 20]),
+                .padding([4, 18]),
         ]
         .align_y(iced::Center),
     )
@@ -364,6 +507,54 @@ pub fn view_window(s: &PlotDialogState) -> Element<'_, Message> {
 
     let paper_opts: Vec<String> = PaperSize::ALL.iter().map(|p| p.label().to_string()).collect();
 
+    // ── Left panel: named page-setup list (click selects, double-click renames)
+    let renaming = if s.name_rename && !s.selected_setup.is_empty() {
+        Some(s.selected_setup.as_str())
+    } else {
+        None
+    };
+    let rename_buf = s.name_input.as_deref().unwrap_or("");
+    let rows: Vec<Element<'_, Message>> = s
+        .page_setups
+        .iter()
+        .map(|name| setup_row(name, &s.selected_setup, renaming, rename_buf))
+        .collect();
+    let list_body: Element<'_, Message> = if rows.is_empty() {
+        container(text("(no page setups)").size(11).color(DIM))
+            .padding([6, 8])
+            .into()
+    } else {
+        scrollable(column(rows).spacing(1)).height(Fill).into()
+    };
+    let list_panel = container(
+        column![
+            text("Page setups").size(10).color(DIM),
+            container(list_body)
+                .style(|_: &Theme| container::Style {
+                    background: Some(Background::Color(LIST)),
+                    border: Border {
+                        color: BORDER,
+                        width: 1.0,
+                        radius: 3.0.into(),
+                    },
+                    ..Default::default()
+                })
+                .width(Fill)
+                .height(Fill)
+                .padding(2),
+        ]
+        .spacing(4)
+        .height(Fill),
+    )
+    .width(160)
+    .height(Fill)
+    .padding(iced::Padding {
+        top: 12.0,
+        right: 8.0,
+        bottom: 12.0,
+        left: 12.0,
+    });
+
     // ── Left column ──────────────────────────────────────────────────────
     let style_label: String = if s.style_name.is_empty() {
         "(none)".into()
@@ -507,10 +698,14 @@ pub fn view_window(s: &PlotDialogState) -> Element<'_, Message> {
     .spacing(9)
     .width(Fill);
 
-    let body = row![left, right].spacing(18).padding(14).width(Fill);
-    let content = scrollable(body).width(Fill).height(Fill);
+    let detail = scrollable(
+        container(row![left, right].spacing(18).width(Fill)).padding(14),
+    )
+    .width(Fill)
+    .height(Fill);
+    let body = row![list_panel, vsep(), detail].height(Fill);
 
-    container(column![toolbar, hdivider(), content].spacing(0))
+    container(column![toolbar, hdivider(), body].spacing(0))
         .style(|_: &Theme| container::Style {
             background: Some(Background::Color(BG)),
             ..Default::default()