Psion Teklogix 7527S User's Guide download pdf (Page 193)

Chapter 20: Trigger Control

Overview

Psion Teklogix Mobile Devices SDK Developers Guide 181

20.1 Overview

All Psion Teklogix computers have one or more keyboard [SCAN] buttons, some have [SCAN]

buttons on the side, and some have the option for a pistol grip trigger. Usually, these buttons are all

used to initiate a bar code scan or an RFID read cycle. The Mobile Devices SDK allows you to

select any keyboard key or the pistol grip trigger as the means of controlling hardware activity.

Ownership of the trigger mechanisms can be defined in the Mobile Devices SDK.

Each time a trigger is pressed or released an event is generated. The Mobile Devices SDK also

enables an application to generate simulated trigger events.

20.2 Definition Of Terms

Trigger source: A trigger source causes a trigger event. A trigger source is one of the following:

• The pistol grip trigger.

• Any key on the keyboard of the Psion Teklogix computer, including any [SCAN] buttons.

Trigger source ID: Each trigger source has a unique trigger source ID in the form of an integer.

Friendly name: Each trigger source can have a user-friendly name. The friendly name appears on

the Manage Triggers Control Panel applet, and only trigger sources with a friendly name defined

can be accessed through the applet. This name—maximum 15 characters— is the name of the

keyboard key or the trigger source, for example:

• Grip Trigger

•F1

•Scan

• L. Side Scan

If your application creates a new trigger source, and you want to access the trigger source through

the Manage Triggers applet, you must give it a friendly name.

Trigger consumer: An application that receives trigger events. Each trigger consumer is identi-

fied by its unique name—a character string.

Trigger association: A mapping between a trigger source and a trigger consumer.

Double-click time: This is the maximum length of time allowed between two successive presses

of a trigger source for a double-click event to be generated. The default value is 0 (zero).

20.3 Trigger Consumer Registration

Each application that is a trigger consumer must be registered to receive the trigger events. During

registration, a unique trigger consumer name must be associated with the trigger consumer. Once

it is registered, it can be associated with one or more trigger sources. Deregistering a trigger con-

sumer makes all its trigger associations inactive—they become active again when the consumer

registers again.

20.4 Trigger Source IDs

A trigger source ID is associated with the pistol grip trigger or one of the keyboard keys using key-

board remapping. See “Keyboard Remapping” on page 56

for information on how to do this.

Trigger source IDs are unique. The first 256 ID numbers (0-255) are reserved as system (non-key-

board) trigger IDs. Most system trigger IDs will not be available to applications (e.g. most

external scanner triggers). The most notable exception is the pistol-grip trigger, which has the

system trigger ID value of 0 (zero).

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Psion Teklogix 7527S User's Guide Page 193

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