openscad navigation (#211)

* openscad navigation

* addressed pr feedback: fixing box selection conflict with openscad and use constant for openscad

crates/ui-egui/src/prefs.rs

@@ -18,6 +18,7 @@ use crate::theme::Tokens;
 use crate::viewport::NavMode;
 
 pub const UNITS: [&str; 5] = ["mm", "cm", "m", "in", "ft"];
+pub const OPENSCAD_NAV: &str = "openscad";
 /// A mouse button that can drag the camera.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum NavButton {
@@ -81,7 +82,7 @@ use NavButton::{Left, Middle, Right};
 use NavMode::{Orbit, Pan, Zoom};
 
 /// The mouse mappings. The first is the default.
-pub const NAV_PRESETS: [NavPreset; 5] = [
+pub const NAV_PRESETS: [NavPreset; 6] = [
     NavPreset {
         id: "fusion",
         label: "Fusion",
@@ -134,6 +135,19 @@ pub const NAV_PRESETS: [NavPreset; 5] = [
         reverse_zoom: false,
         bindings: &[bind(Right, NavKeys::SHIFT, Pan), bind(Right, NavKeys::NONE, Orbit), bind(Middle, NavKeys::NONE, Pan)],
     },
+    NavPreset {
+        id: OPENSCAD_NAV,
+        label: "OpenSCAD",
+        help: "Left drag on empty space orbits, Shift+left drag box-selects, sketch geometry drags edit; right or middle drag pans, Shift+right or Shift+middle drag zooms",
+        reverse_zoom: false,
+        bindings: &[
+            bind(Left, NavKeys::NONE, Orbit),
+            bind(Right, NavKeys::SHIFT, Zoom),
+            bind(Middle, NavKeys::SHIFT, Zoom),
+            bind(Right, NavKeys::NONE, Pan),
+            bind(Middle, NavKeys::NONE, Pan),
+        ],
+    },
 ];
 
 /// The preset with this id (the default for an unknown one).
@@ -714,7 +728,8 @@ fn page(app: &mut SolveApp, ui: &mut egui::Ui, t: &Tokens) {
                 }
             });
             ui.end_row();
-            note(ui, &format!("{}; hold Shift during orbit to snap; the wheel zooms", nav_preset(&app.preferences.nav).help));
+            let snap_help = if app.preferences.nav == OPENSCAD_NAV { "" } else { "; hold Shift during orbit to snap" };
+            note(ui, &format!("{}{snap_help}; the wheel zooms", nav_preset(&app.preferences.nav).help));
             ui.label("Context menu");
             ui.checkbox(&mut app.preferences.radial_context_menu, "Radial context menu");
             ui.end_row();
@@ -871,7 +886,7 @@ pub fn set(app: &mut SolveApp, p: &serde_json::Value) -> Result<serde_json::Valu
         return Err(format!("units must be one of {}", UNITS.join(", ")));
     }
     if !NAV_PRESETS.iter().any(|p| p.id == new.nav) || !MSAA.contains(&new.msaa) {
-        return Err("`nav` must be fusion, solidworks, inventor, alias or tinkercad and `msaa` 1, 2, 4 or 8".into());
+        return Err("`nav` must be fusion, solidworks, inventor, alias, tinkercad or openscad and `msaa` 1, 2, 4 or 8".into());
     }
     if !THEMES.iter().any(|(id, _)| *id == new.theme) || !["z", "y"].contains(&new.up_axis.as_str()) {
         return Err("`theme` must be dark, light or system and `up_axis` z or y".into());
@@ -959,6 +974,20 @@ mod tests {
         assert!(!app.preferences.smooth_wheel_zoom);
     }
 
+    #[test]
+    fn openscad_preset_maps_navigation_and_persists() {
+        let mut app = SolveApp::new(solvecraft_engine::Session::default(), Default::default());
+        set(&mut app, &json!({"nav": OPENSCAD_NAV})).unwrap();
+        for button in [NavButton::Middle, NavButton::Right] {
+            assert_eq!(nav_mode(&app, button, Modifiers::default()), Some(NavMode::Pan));
+            assert_eq!(nav_mode(&app, button, Modifiers { shift: true, ..Default::default() }), Some(NavMode::Zoom));
+        }
+        assert_eq!(nav_mode(&app, NavButton::Left, Modifiers::default()), Some(NavMode::Orbit));
+        let mut other = SolveApp::new(solvecraft_engine::Session::default(), Default::default());
+        other.load_prefs(&app.prefs());
+        assert_eq!(other.preferences.nav, OPENSCAD_NAV);
+    }
+
     #[test]
     fn presets_map_the_mouse_and_prefs_round_trip() {
         let mut app = SolveApp::new(solvecraft_engine::Session::default(), Default::default());