UI: Extend context menu to check current selection

- This extends context menus, checking the selection in some cases
  to conditionally show operators.

- When nothing is selected, add, paste .. etc are added to the menu.

- Use columns when mixed mesh modes are used (vert/edge/face).

- Move armature naming operators into sub-menu.

See D4043

1 files changed, 19 insertions, 6 deletions

diff --git a/release/scripts/startup/bl_ui/space_node.py b/release/scripts/startup/bl_ui/space_node.py
index 750c01d28e5..c5718df3b92 100644
--- a/release/scripts/startup/bl_ui/space_node.py
+++ b/release/scripts/startup/bl_ui/space_node.py
@@ -331,22 +331,35 @@ class NODE_MT_specials(Menu):
     def draw(self, context):
         layout = self.layout
 
+        # If nothing is selected
+        selected_nodes_len = len(context.selected_nodes)
+        if selected_nodes_len == 0:
+            layout.operator_context = 'INVOKE_DEFAULT'
+            layout.menu("NODE_MT_add")
+            layout.operator("node.clipboard_paste", text="Paste")
+            return
+
+        # If something is selected
         layout.operator_context = 'INVOKE_DEFAULT'
         layout.operator("node.duplicate_move")
         layout.operator("node.delete")
+        layout.operator("node.clipboard_copy", text="Copy")
+        layout.operator("node.clipboard_paste", text="Paste")
         layout.operator_context = 'EXEC_DEFAULT'
 
         layout.operator("node.delete_reconnect")
 
-        layout.separator()
+        if selected_nodes_len > 1:
+            layout.separator()
 
-        layout.operator("node.link_make").replace = False
-        layout.operator("node.link_make", text="Make and Replace Links").replace = True
-        layout.operator("node.links_detach")
+            layout.operator("node.link_make").replace = False
+            layout.operator("node.link_make", text="Make and Replace Links").replace = True
+            layout.operator("node.links_detach")
 
-        layout.separator()
+            layout.separator()
+
+            layout.operator("node.group_make", text="Group")
 
-        layout.operator("node.group_make", text="Group")
         layout.operator("node.group_ungroup", text="Ungroup")
         layout.operator("node.group_edit").exit = False