Curves: add switch direction edit mode operator

scripts/startup/bl_ui/space_view3d.py

@@ -1175,6 +1175,7 @@ class VIEW3D_MT_editor_menus(Menu):
                 layout.menu("VIEW3D_MT_edit_curve_ctrlpoints")
                 layout.menu("VIEW3D_MT_edit_curve_segments")
             elif mode_string in {'EDIT_CURVES', 'EDIT_POINT_CLOUD'}:
+                layout.menu("VIEW3D_MT_edit_curves_segments")
                 layout.template_node_operator_asset_root_items()
             elif mode_string == 'EDIT_GREASE_PENCIL':
                 layout.menu("VIEW3D_MT_edit_greasepencil_stroke")
@@ -5916,6 +5917,15 @@ class VIEW3D_MT_edit_curves(Menu):
         layout.template_node_operator_asset_menu_items(catalog_path=self.bl_label)
 
 
+class VIEW3D_MT_edit_curves_segments(Menu):
+    bl_label = "Segments"
+
+    def draw(self, _context):
+        layout = self.layout
+
+        layout.operator("curves.switch_direction")
+
+
 class VIEW3D_MT_edit_pointcloud(Menu):
     bl_label = "Point Cloud"
 
@@ -9058,6 +9068,7 @@ classes = (
     VIEW3D_MT_edit_armature_delete,
     VIEW3D_MT_edit_gpencil_transform,
     VIEW3D_MT_edit_curves,
+    VIEW3D_MT_edit_curves_segments,
     VIEW3D_MT_edit_pointcloud,
     VIEW3D_MT_object_mode_pie,
     VIEW3D_MT_view_pie,

source/blender/editors/curves/intern/curves_ops.cc

@@ -1423,6 +1423,40 @@ static void CURVES_OT_curve_type_set(wmOperatorType *ot)
       ot->srna, "type", rna_enum_curves_type_items, CURVE_TYPE_POLY, "Type", "Curve type");
 }
 
+namespace switch_direction {
+
+static int exec(bContext *C, wmOperator *op)
+{
+  for (Curves *curves_id : get_unique_editable_curves(*C)) {
+    bke::CurvesGeometry &curves = curves_id->geometry.wrap();
+    IndexMaskMemory memory;
+    const IndexMask selection = retrieve_selected_curves(*curves_id, memory);
+    if (selection.is_empty()) {
+      continue;
+    }
+
+    curves.reverse_curves(selection);
+
+    DEG_id_tag_update(&curves_id->id, ID_RECALC_GEOMETRY);
+    WM_event_add_notifier(C, NC_GEOM | ND_DATA, curves_id);
+  }
+  return OPERATOR_FINISHED;
+}
+
+}  // namespace switch_direction
+
+static void CURVES_OT_switch_direction(wmOperatorType *ot)
+{
+  ot->name = "Switch Direction";
+  ot->idname = __func__;
+  ot->description = "Reverse the direction of the selected curves";
+
+  ot->exec = switch_direction::exec;
+  ot->poll = editable_curves_in_edit_mode_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+}
+
 void operatortypes_curves()
 {
   WM_operatortype_append(CURVES_OT_attribute_set);
@@ -1444,6 +1478,7 @@ void operatortypes_curves()
   WM_operatortype_append(CURVES_OT_tilt_clear);
   WM_operatortype_append(CURVES_OT_cyclic_toggle);
   WM_operatortype_append(CURVES_OT_curve_type_set);
+  WM_operatortype_append(CURVES_OT_switch_direction);
 }
 
 void operatormacros_curves()