feat(viewport): interactive VPORTS model tiled presets

Model space'de VPORTS artık iki aşamalı: bare VPORTS bir yapılandırma
istiyor (SIngle/2H/2V/4), sonraki komut-satırı girdisi düzeni kuruyor
(boş giriş = SINGLE). set_model_tile_layout normalized rect listesiyle
tiled düzeni değiştiriyor:
- SINGLE: tek tam-ekran
- 2H: üst/alt
- 2V: sol/sağ
- 4: 2x2

awaiting_vports app flag'i prompt sonrası girdiyi yakalıyor. Paper-space
VPORTS davranışı değişmedi.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/commands.rs

@@ -2663,8 +2663,48 @@ impl OpenCADStudio {
                 let sub = cmd.split_whitespace().nth(1).unwrap_or("").to_uppercase();
                 let scene = &self.tabs[i].scene;
                 if scene.current_layout == "Model" {
-                    self.command_line
+                    // Bare VPORTS → ask for the configuration interactively;
-                        .push_error("VPORTS: switch to a paper space layout first.");
+                    // the next command-line entry supplies it.
+                    if sub.is_empty() {
+                        self.awaiting_vports = true;
+                        self.command_line
+                            .push_info("VPORTS  Configuration [SIngle/2H/2V/4]:");
+                        return self.focus_cmd_input();
+                    }
+                    // Model space: split the tiled viewport layout.
+                    use iced::Rectangle as R;
+                    let full = R { x: 0.0, y: 0.0, width: 1.0, height: 1.0 };
+                    let rects: Option<Vec<R>> = match sub.as_str() {
+                        "SINGLE" | "SI" | "1" => Some(vec![full]),
+                        "2H" | "2" => Some(vec![
+                            R { x: 0.0, y: 0.0, width: 1.0, height: 0.5 },
+                            R { x: 0.0, y: 0.5, width: 1.0, height: 0.5 },
+                        ]),
+                        "2V" => Some(vec![
+                            R { x: 0.0, y: 0.0, width: 0.5, height: 1.0 },
+                            R { x: 0.5, y: 0.0, width: 0.5, height: 1.0 },
+                        ]),
+                        "4" => Some(vec![
+                            R { x: 0.0, y: 0.0, width: 0.5, height: 0.5 },
+                            R { x: 0.5, y: 0.0, width: 0.5, height: 0.5 },
+                            R { x: 0.0, y: 0.5, width: 0.5, height: 0.5 },
+                            R { x: 0.5, y: 0.5, width: 0.5, height: 0.5 },
+                        ]),
+                        _ => None,
+                    };
+                    match rects {
+                        Some(rects) => {
+                            let n = rects.len();
+                            self.tabs[i].scene.set_model_tile_layout(rects);
+                            self.tabs[i].scene.camera_generation += 1;
+                            self.command_line
+                                .push_output(&format!("VPORTS: {n} viewport(s)."));
+                        }
+                        None => {
+                            self.command_line
+                                .push_error("VPORTS: use SINGLE | 2H | 2V | 4.");
+                        }
+                    }
                 } else if sub.is_empty() {
                     // ── List existing viewports ──────────────────────────
                     let layout_block = scene.current_layout_block_handle_pub();

src/app/mod.rs

@@ -70,6 +70,9 @@ pub(super) struct OpenCADStudio {
     show_grid: bool,
     /// Dynamic input overlay (F12): show coordinate tooltip near cursor.
     dyn_input: bool,
+    /// `true` after a bare `VPORTS` in model space — the next command-line
+    /// entry is treated as the tiled-config option (SIngle/2H/2V/4).
+    awaiting_vports: bool,
     /// Show the UCS icon in the bottom-left corner of model space (UCSICON).
     show_ucs_icon: bool,
     /// Whether the ViewCube 3D gizmo is visible in model space (NAVVCUBE).
@@ -743,6 +746,7 @@ impl OpenCADStudio {
             polar_increment_deg: 45.0,
             show_grid: false,
             dyn_input: true,
+            awaiting_vports: false,
             show_ucs_icon: true,
             show_viewcube: true,
             show_properties: true,

src/app/update.rs

@@ -963,6 +963,15 @@ impl OpenCADStudio {
                 // dropdown so the dispatched command's new prompt is
                 // immediately visible on the overlay.
                 self.command_line.close_history();
+                // Interactive VPORTS: the entry after a bare `VPORTS` is the
+                // tiled configuration. Empty input defaults to SINGLE.
+                if self.awaiting_vports {
+                    self.awaiting_vports = false;
+                    let cfg = self.command_line.input.trim().to_string();
+                    self.command_line.input.clear();
+                    let cfg = if cfg.is_empty() { "SINGLE".to_string() } else { cfg };
+                    return self.dispatch_command(&format!("VPORTS {cfg}"));
+                }
                 // If the user navigated the autocomplete list with the
                 // arrow keys, Enter dispatches the highlighted command
                 // rather than the partial text actually in the buffer.

src/scene/mod.rs

@@ -4362,18 +4362,31 @@ impl Scene {
         true
     }
 
-    /// Reset the Model layout to a single full-window tile.
+    /// Replace the Model tiled layout with the given normalized rectangles
-    pub fn reset_model_tiles(&self) {
+    /// (each in 0..1). Every tile inherits the current camera; the first
+    /// tile becomes active. Used by VPORTS presets and `reset_model_tiles`.
+    pub fn set_model_tile_layout(&self, rects: Vec<iced::Rectangle>) {
         let cam_now = self.camera.borrow().clone();
-        *self.model_tiles.borrow_mut() = vec![ModelTile {
+        let tiles: Vec<ModelTile> = rects
-            rect: iced::Rectangle {
+            .into_iter()
-                x: 0.0,
+            .map(|rect| ModelTile {
-                y: 0.0,
+                rect,
-                width: 1.0,
+                camera: cam_now.clone(),
-                height: 1.0,
+            })
-            },
+            .collect();
-            camera: cam_now,
+        *self.model_tiles.borrow_mut() = if tiles.is_empty() {
-        }];
+            vec![ModelTile {
+                rect: iced::Rectangle {
+                    x: 0.0,
+                    y: 0.0,
+                    width: 1.0,
+                    height: 1.0,
+                },
+                camera: cam_now,
+            }]
+        } else {
+            tiles
+        };
         self.active_model_tile.set(0);
     }