Arbortext Command Language > Callbacks > doc_add_callback > delete Callback Type
  
delete Callback Type
Function prototype:
function funcname (doc, op)
delete is called before a delete operation occurs in the Edit window.
Arguments
doc is the identifier of the document in which the delete was attempted and can be used to derive the cursor position or the selected region.
op is the function callback operation. Callbacks are called twice in succession with op specifying the stage of callback operation.
1. op == 1 first call — The returned argument specifies whether the execution should continue or be stopped:
0 — Continue callback processing.
-1 — Stop further callback processing.
2. op == 2 second call — Occurs unless the processing was stopped during the first call. The returned argument allows or prevents basic Arbortext Editor processing after all callbacks have been called:
0 — Basic Arbortext Editor processing allowed.
-1 — Basic Arbortext Editor processing prevented.