VFW120 Using Hidden Commands

VFW120 – Using Hidden Commands

Hidden Command Handler Anatomy

• Hidden commands are run in the same way as other commands but do not appear on tabs or in separate windows and are hidden from the user

• Are used to perform non-visual tasks.

• For Windows applications hidden commands are reusable parts with an ancestor of VF_AC020.

• Have most non-visual VL Framework and instance list services available to them.

Structurally, Hidden Command Handlers for Windows applications are similar to Windows Command Handlers with these important differences:

• They extend the base class #VF_AC020.

• They don't use the optional method uInitialize.

• They don't use the optional method uTerminate.

• They don't listen to events.

When using Hidden Command Handlers it is important to remember that they:

• Should always have the Default Command option set to NEVER for instance level commands or NO for business object level commands.

• Should never be used with the Hide All Other Command Tabs option set.

• Should never be attached to RAMP Destination screens.

• Should never attempt to display information to the user or interact with the user. Hidden means hidden

Objectives

• To create a demonstration hidden command, 'Reverse', which will act on the current instance list entry and reverse the employee full name string.

• This is a quick and simple example to demonstrate the principle.

To achieve this objective you will complete the following steps:

Step 1. Add Reverse as a Hidden Command for Employees

Step 2. Create the Reverse Command

Step 3. Plugin and Test Reverse Command

Summary

Before You Begin

Complete exercises VFW030, VFW040 and VFW042.