Key labels versus action defaults

In Four Js Business Development Suite (BDS), labels can be defined for keys such as accept, F10 or Control-Z. With this feature, it is possible to easily decorate ON KEY or COMMAND KEY blocks with a button in the action panel.

With Genero Business Development Language (BDL), interaction statements can define actions with the ON ACTION blocks. These action handlers are more abstract than ON KEY: You identify an action by a name, while decoration is defined in form files ( ACTION DEFAULTS section) or in global configuration files (.4ad file).

When adapting your code for Genero, you are free to use the traditional ON KEY blocks or the new ON ACTION blocks. Genero still supports the key label settings as in Four Js BDS. However, key label settings will overwrite action defaults settings. Additionally, if the name of the key specified in the ON KEY clause does not only contain alphanumeric characters (such as Control-Z), it will not be possible to define action defaults attributes for these action handlers, as action names must be simple identifiers. This is also true for Menu COMMAND labels, for example with COMMAND "Exit program".