int dal_men_set_lfp_men (idm, fnc)

Sets a menu-listener callback function.

Input Parameters Significance
DtvLong idm menu-Id
MEN_FNC_LAY_LNR fnc pointer to the menu-listener function

Output Parameters Significance
none -

Return Code Significance
0 all OK
1 old menu-listener function was overwritten
-1 No menu Id passed

With the help of the menu-listener callback function you can react on changes to the local data structure. The menu-listener function is automatically invoked by all functions that change menus, such as dal_men_wri_row.

The menu-listener function must correspond to the specification void fnc(idm, typ, fnc_nam, par). The parameters are:

If the same listener function is used for all objects (menus, button areas, masks), the enumeration type DTV_LAY_LNR_TYP can be used to determine from which object the listener function was called.