ITT Rule IDL Version 7.0 Uživatelský manuál stáhnout pdf (Strana 182)

182 Chapter 7: Creating an Operation

Registering an Operation iTool Developer’s Guide

Registering an Operation

Before an operation can be performed by an iTool, the operation’s class definition

must be registered as being available to the iTool. Registering an operation with the

iTool links the class definition file that contains the actual IDL code that defines the

operation with a simple string that names the type. Code that performs an operation in

an iTool uses the name string to specify which operation should be performed.

Using IDLitTool::RegisterOperation

In most cases, you will register an operation with the iTool in the iTool’s class Init

method. Registration ensures that the operation is available to the iTool. (See

“Creating a New iTool Class” on page 91 for details on the iTool class Init method.)

To register an operation, call the IDLitTool::RegisterOperation method:

self->RegisterOperation,

OperationName

Operation_Class_Name

where OperationName is the string you will use when referring to the operation, and

Operation_Class_Name is a string that specifies the name of the class file that

contains the operation’s definition.

Note

The file

Operation_Class_Name

__define.pro must exist somewhere in

IDL’s path for the visualization type to be successfully registered.

See “IDLitTool::RegisterOperation” (IDL Reference Guide) for details.

Specifying Useful Properties

You can set any property of the IDLitOperation and IDLitComponent classes when

registering an operation. The following properties may be of particular interest:

EXPENSIVE_COMPUTATION

A boolean value that indicates whether the operation is expensive. Expensive

operations are those that require significant memory or processing time to execute.

Individual operations should use the value of this property to determine whether the

results of the operation should be cached to avoid re-execution when undoing or

redoing.

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ITT Rule IDL Version 7.0 Uživatelský manuál Strana 182