[Bf-blender-cvs] [11843e7c299] master: UI: set the message for disabled vertex weight operators

[Campbell Barton]

Commit: 11843e7c299c3289078360657c9ace91ac9a5f07
Author: Campbell Barton
Date:   Wed Nov 4 11:36:55 2020 +1100
Branches: master
https://developer.blender.org/rB11843e7c299c3289078360657c9ace91ac9a5f07

UI: set the message for disabled vertex weight operators

===================================================================

M	source/blender/editors/object/object_vgroup.c

===================================================================

diff --git a/source/blender/editors/object/object_vgroup.c b/source/blender/editors/object/object_vgroup.c
index e92b3323441..b48b854c238 100644
--- a/source/blender/editors/object/object_vgroup.c
+++ b/source/blender/editors/object/object_vgroup.c
@@ -2664,12 +2664,23 @@ static void vgroup_assign_verts(Object *ob, const float weight)
 static bool vertex_group_supported_poll_ex(bContext *C, const Object *ob)
 {
   if (!ED_operator_object_active_local_editable_ex(C, ob)) {
+    CTX_wm_operator_poll_msg_set(C, "No active editable object");
     return false;
   }
+
+  if (!OB_TYPE_SUPPORT_VGROUP(ob->type)) {
+    CTX_wm_operator_poll_msg_set(C, "Object type does not support vertex groups");
+    return false;
+  }
+
+  /* Data checks. */
   const ID *data = ob->data;
-  return (OB_TYPE_SUPPORT_VGROUP(ob->type) &&
-          /* Data checks. */
-          (data != NULL) && !ID_IS_LINKED(data) && !ID_IS_OVERRIDE_LIBRARY(data));
+  if (data == NULL || ID_IS_LINKED(data) || ID_IS_OVERRIDE_LIBRARY(data)) {
+    CTX_wm_operator_poll_msg_set(C, "Object type \"%s\" does not have editable data");
+    return false;
+  }
+
+  return true;
 }
 
 static bool vertex_group_supported_poll(bContext *C)
@@ -2678,48 +2689,61 @@ static bool vertex_group_supported_poll(bContext *C)
   return vertex_group_supported_poll_ex(C, ob);
 }
 
-static bool vertex_group_poll(bContext *C)
+static bool vertex_group_poll_ex(bContext *C, Object *ob)
 {
-  Object *ob = ED_object_context(C);
+  if (!vertex_group_supported_poll_ex(C, ob)) {
+    return false;
+  }
+
+  if (BLI_listbase_is_empty(&ob->defbase)) {
+    CTX_wm_operator_poll_msg_set(C, "Object has no vertex groups");
+    return false;
+  }
 
-  return (vertex_group_supported_poll(C) && ob->defbase.first);
+  return true;
 }
 
-static bool vertex_group_mesh_poll(bContext *C)
+static bool vertex_group_poll(bContext *C)
 {
   Object *ob = ED_object_context(C);
-
-  return (vertex_group_poll(C) && ob->type == OB_MESH);
+  return vertex_group_poll_ex(C, ob);
 }
 
-static bool vertex_group_mesh_with_dvert_poll(bContext *C)
+static bool vertex_group_mesh_poll_ex(bContext *C, Object *ob)
 {
-  Object *ob = ED_object_context(C);
-
-  if (!vertex_group_mesh_poll(C)) {
+  if (!vertex_group_poll_ex(C, ob)) {
     return false;
   }
 
-  Mesh *me = ob->data;
-  if (me->dvert == NULL) {
+  if (ob->type != OB_MESH) {
+    CTX_wm_operator_poll_msg_set(C, "Only mesh objects are supported");
     return false;
   }
 
   return true;
 }
 
-static bool UNUSED_FUNCTION(vertex_group_mesh_supported_poll)(bContext *C)
+static bool vertex_group_mesh_with_dvert_poll(bContext *C)
 {
   Object *ob = ED_object_context(C);
+  if (!vertex_group_mesh_poll_ex(C, ob)) {
+    return false;
+  }
+
+  Mesh *me = ob->data;
+  if (me->dvert == NULL) {
+    CTX_wm_operator_poll_msg_set(C, "The active mesh object has no vertex group data");
+    return false;
+  }
 
-  return (vertex_group_supported_poll(C) && ob->type == OB_MESH);
+  return true;
 }
 
 static bool UNUSED_FUNCTION(vertex_group_poll_edit)(bContext *C)
 {
   Object *ob = ED_object_context(C);
 
-  if (!vertex_group_supported_poll(C)) {
+  if (!vertex_group_supported_poll_ex(C, ob)) {
     return false;
   }
 
@@ -2733,7 +2757,7 @@ static bool vertex_group_vert_poll_ex(bContext *C,
 {
   Object *ob = ED_object_context(C);
 
-  if (!vertex_group_supported_poll(C)) {
+  if (!vertex_group_supported_poll_ex(C, ob)) {
     return false;
   }
 
@@ -2786,7 +2810,7 @@ static bool vertex_group_vert_select_unlocked_poll(bContext *C)
 {
   Object *ob = ED_object_context(C);
 
-  if (!vertex_group_supported_poll(C)) {
+  if (!vertex_group_supported_poll_ex(C, ob)) {
     return false;
   }
 
@@ -2807,7 +2831,7 @@ static bool vertex_group_vert_select_mesh_poll(bContext *C)
 {
   Object *ob = ED_object_context(C);
 
-  if (!vertex_group_supported_poll(C)) {
+  if (!vertex_group_supported_poll_ex(C, ob)) {
     return false;
   }