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PegPresentationManager

PegWindow1

PegPrompt1

PegPrompt2

PegButton

PegWindow2

PegCheckBox

PEG provides the following functions to access and traverse this tree structure:

PegThing* PegThing::Parent(void);

PegThing* PegThing::First(void);

PegThing* PegThing::Next(void);

PegThing* PegThing::Previous(void);

Their use can best be explained using a close up view of a portion of the previous tree

diagram:

Next()

PegWindow2

PegWindow1

Previous()

First()

Parent()

PegButton

Next()

PegPrompt1

Previous()

Again, let’s take the role of PegWindow1. First() would return the first child in our

linked list of children, PegPrompt1. Parent(), although not drawn, would return the

Casio ClassPad 300 Programming Guide

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