Curves: improve Add menu for new curves object

The goal is to make the Add menu more convenient for the new curves object.
The following changes are done:
* Add `curves` submenu.
* Add an `Empty Hair` operator that also sets the surface object.
* Rename the old operator to `Random`. It's mostly for testing at this point.

Differential Revision: https://developer.blender.org/D14556

release/scripts/startup/bl_ui/space_view3d.py

@@ -2052,6 +2052,19 @@ class VIEW3D_MT_curve_add(Menu):
         layout.operator("curve.primitive_nurbs_path_add", text="Path", icon='CURVE_PATH')
 
 
+class VIEW3D_MT_curves_add(Menu):
+    bl_idname = "VIEW3D_MT_curves_add"
+    bl_label = "Curves"
+
+    def draw(self, _context):
+        layout = self.layout
+
+        layout.operator_context = 'INVOKE_REGION_WIN'
+
+        layout.operator("object.curves_empty_hair_add", text="Empty Hair", icon='CURVES_DATA')
+        layout.operator("object.curves_random_add", text="Random", icon='CURVES_DATA')
+
+
 class VIEW3D_MT_surface_add(Menu):
     bl_idname = "VIEW3D_MT_surface_add"
     bl_label = "Surface"
@@ -2204,12 +2217,12 @@ class VIEW3D_MT_add(Menu):
 
         # layout.operator_menu_enum("object.curve_add", "type", text="Curve", icon='OUTLINER_OB_CURVE')
         layout.menu("VIEW3D_MT_curve_add", icon='OUTLINER_OB_CURVE')
+        if context.preferences.experimental.use_new_curves_type:
+            layout.menu("VIEW3D_MT_curves_add", icon='OUTLINER_OB_CURVES')
         # layout.operator_menu_enum("object.surface_add", "type", text="Surface", icon='OUTLINER_OB_SURFACE')
         layout.menu("VIEW3D_MT_surface_add", icon='OUTLINER_OB_SURFACE')
         layout.menu("VIEW3D_MT_metaball_add", text="Metaball", icon='OUTLINER_OB_META')
         layout.operator("object.text_add", text="Text", icon='OUTLINER_OB_FONT')
-        if context.preferences.experimental.use_new_curves_type:
-            layout.operator("object.hair_curves_add", text="Hair Curves", icon='OUTLINER_OB_CURVES')
         if context.preferences.experimental.use_new_point_cloud_type:
             layout.operator("object.pointcloud_add", text="Point Cloud", icon='OUTLINER_OB_POINTCLOUD')
         layout.menu("VIEW3D_MT_volume_add", text="Volume", icon='OUTLINER_OB_VOLUME')
@@ -7638,6 +7651,7 @@ classes = (
     VIEW3D_MT_angle_control,
     VIEW3D_MT_mesh_add,
     VIEW3D_MT_curve_add,
+    VIEW3D_MT_curves_add,
     VIEW3D_MT_surface_add,
     VIEW3D_MT_edit_metaball_context_menu,
     VIEW3D_MT_metaball_add,

source/blender/editors/object/object_add.cc

@@ -2044,10 +2044,10 @@ void OBJECT_OT_speaker_add(wmOperatorType *ot)
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name Add Hair Curves Operator
+/** \name Add Curves Operator
  * \{ */
 
-static bool object_hair_curves_add_poll(bContext *C)
+static bool object_curves_add_poll(bContext *C)
 {
   if (!U.experimental.use_new_curves_type) {
     return false;
@@ -2055,7 +2055,7 @@ static bool object_hair_curves_add_poll(bContext *C)
   return ED_operator_objectmode(C);
 }
 
-static int object_hair_curves_add_exec(bContext *C, wmOperator *op)
+static int object_curves_random_add_exec(bContext *C, wmOperator *op)
 {
   using namespace blender;
 
@@ -2075,16 +2075,16 @@ static int object_hair_curves_add_exec(bContext *C, wmOperator *op)
   return OPERATOR_FINISHED;
 }
 
-void OBJECT_OT_hair_curves_add(wmOperatorType *ot)
+void OBJECT_OT_curves_random_add(wmOperatorType *ot)
 {
   /* identifiers */
-  ot->name = "Add Hair Curves";
-  ot->description = "Add a hair curves object to the scene";
-  ot->idname = "OBJECT_OT_hair_curves_add";
+  ot->name = "Add Random Curves";
+  ot->description = "Add a curves object with random curves to the scene";
+  ot->idname = "OBJECT_OT_curves_random_add";
 
   /* api callbacks */
-  ot->exec = object_hair_curves_add_exec;
-  ot->poll = object_hair_curves_add_poll;
+  ot->exec = object_curves_random_add_exec;
+  ot->poll = object_curves_add_poll;
 
   /* flags */
   ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
@@ -2092,6 +2092,43 @@ void OBJECT_OT_hair_curves_add(wmOperatorType *ot)
   ED_object_add_generic_props(ot, false);
 }
 
+static int object_curves_empty_hair_add_exec(bContext *C, wmOperator *op)
+{
+  ushort local_view_bits;
+  float loc[3], rot[3];
+  if (!ED_object_add_generic_get_opts(
+          C, op, 'Z', loc, rot, nullptr, nullptr, &local_view_bits, nullptr)) {
+    return OPERATOR_CANCELLED;
+  }
+
+  Object *surface_ob = CTX_data_active_object(C);
+
+  Object *object = ED_object_add_type(C, OB_CURVES, nullptr, loc, rot, false, local_view_bits);
+  object->dtx |= OB_DRAWBOUNDOX; /* TODO: remove once there is actual drawing. */
+
+  if (surface_ob != nullptr && surface_ob->type == OB_MESH) {
+    Curves *curves_id = static_cast<Curves *>(object->data);
+    curves_id->surface = surface_ob;
+    id_us_plus(&surface_ob->id);
+  }
+
+  return OPERATOR_FINISHED;
+}
+
+void OBJECT_OT_curves_empty_hair_add(wmOperatorType *ot)
+{
+  ot->name = "Add Empty Curves";
+  ot->description = "Add an empty curve object to the scene with the selected mesh as surface";
+  ot->idname = "OBJECT_OT_curves_empty_hair_add";
+
+  ot->exec = object_curves_empty_hair_add_exec;
+  ot->poll = object_curves_add_poll;
+
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+
+  ED_object_add_generic_props(ot, false);
+}
+
 /** \} */
 
 /* -------------------------------------------------------------------- */

source/blender/editors/object/object_intern.h

@@ -113,7 +113,8 @@ void OBJECT_OT_light_add(struct wmOperatorType *ot);
 void OBJECT_OT_effector_add(struct wmOperatorType *ot);
 void OBJECT_OT_camera_add(struct wmOperatorType *ot);
 void OBJECT_OT_speaker_add(struct wmOperatorType *ot);
-void OBJECT_OT_hair_curves_add(struct wmOperatorType *ot);
+void OBJECT_OT_curves_random_add(struct wmOperatorType *ot);
+void OBJECT_OT_curves_empty_hair_add(struct wmOperatorType *ot);
 void OBJECT_OT_pointcloud_add(struct wmOperatorType *ot);
 /**
  * Only used as menu.

source/blender/editors/object/object_ops.c

@@ -89,7 +89,8 @@ void ED_operatortypes_object(void)
   WM_operatortype_append(OBJECT_OT_light_add);
   WM_operatortype_append(OBJECT_OT_camera_add);
   WM_operatortype_append(OBJECT_OT_speaker_add);
-  WM_operatortype_append(OBJECT_OT_hair_curves_add);
+  WM_operatortype_append(OBJECT_OT_curves_random_add);
+  WM_operatortype_append(OBJECT_OT_curves_empty_hair_add);
   WM_operatortype_append(OBJECT_OT_pointcloud_add);
   WM_operatortype_append(OBJECT_OT_volume_add);
   WM_operatortype_append(OBJECT_OT_volume_import);