ITT Rule IDL Version 7.0 User Manual download pdf (Page 31)

Chapter 2: iTool System Architecture 31

iTool Developer’s Guide iTool Object Hierarchy

iTool Object Hierarchy

The iTool system is a collection of object class instances organized in a hierarchy of

container objects. The hierarchy serves both to organize the numerous object

instances and to display information about the objects in the iTool user interface. In

most cases, an object’s location in the iTool hierarchy controls where and how the

object is made visible in the user interface.

For example, the Rotate operation object is stored in the iImage iTool’s object

hierarchy with the object identifier

OPERATIONS/OPERATIONS/ROTATE

From this identifier we can deduce two things:

1. The Rotate operation object is stored in the iTool’s object hierarchy in the

OPERATIONS container within the OPERATIONS container.

2. The Rotate operation will be displayed in the iTool’s widget interface under

the Operations menu.

iTool System Object

The iTool system object contains and provides a single point of access to all objects

managed by the iTool system. Only one instance of the iTool system object can exist

in a given IDL session; it is created automatically when any iTool is created.

Note

As an iTool developer, there is no need for you to create or otherwise interact with

the system object yourself. This discussion of the structure of the system object is

included solely to help you understand the organization of iTool objects.

The iTool system object is a subclass of the IDLitContainer object, which provides

functionality to manage a hierarchy of container objects via their object identifiers.

iTool System-Level Hierarchy

As the root of the iTools environment, the iTool system object has the unique object

identifier of “

/”. All fully qualified object identifiers begin with this reference to the

system object, providing a global location on which to base a location in the iTools

hierarchy.

The hierarchy contained by the iTool system object includes the following

containers:

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 429 430

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ITT Rule IDL Version 7.0 User Manual Page 31