Enable lock attribute for statement and form; show this attribute same as grayout.

Signed-off-by: ydong10
Reviewed-by: lgao4

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12721 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/SetupBrowserDxe/Ui.c

@@ -577,6 +577,7 @@ UiWaitForSingleEvent (
 
   @param  String                 String description for this option.
   @param  Handle                 Hii handle for the package list.
+  @param  Form                   The form this statement belong to.
   @param  Statement              Statement of this Menu Option.
   @param  NumberOfLines          Display lines for this Menu Option.
   @param  MenuItemCount          The index for this Option in the Menu.
@@ -588,6 +589,7 @@ UI_MENU_OPTION *
 UiAddMenuOption (
   IN CHAR16                  *String,
   IN EFI_HII_HANDLE          Handle,
+  IN FORM_BROWSER_FORM       *Form,
   IN FORM_BROWSER_STATEMENT  *Statement,
   IN UINT16                  NumberOfLines,
   IN UINT16                  MenuItemCount
@@ -643,6 +645,13 @@ UiAddMenuOption (
       MenuOption->GrayOut = Statement->GrayOutExpression->Result.Value.b;
     }
 
+    //
+    // If the form or the question has the lock attribute, deal same as grayout.
+    //
+    if (Form->Locked || Statement->Locked) {
+      MenuOption->GrayOut = TRUE;
+    }
+    
     switch (Statement->Operand) {
     case EFI_IFR_ORDERED_LIST_OP:
     case EFI_IFR_ONE_OF_OP: