Apple Newton Utilities User's Guide download pdf (Page 89)

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101

CHAPTER 3

Views

About Views 3-5

application base view. (Think of the view hierarchy as a tree structure in which

the tree is turned upside down with its root at the top. The top-level parent view is

the root view.)

Figure 3-2 shows the set of views instantiated from the templates shown in

Figure 3-1. Note that this example is simpliﬁed in that it shows a separate template

for each view. In practice, multiple views often share a single template. Also, this

example doesn’t show templates that are built on other protos.

Figure 3-2 View hierarchy

Arrows indicate a

reference to parent/child

Templates

(permanent, read-only)

Views

(transient, writable)

Arrows indicate a

reference to protos

Parent View

{_proto:

}

Child Template C

{

}

Child Template B

{

}

Child Template D

{

}

Parent Template

{

viewChildren:[]

}

Child Template A

{

viewChildren:[]

}

Child View B

{

_parent:

_proto:

}

Child View A

{_parent:

_proto:

}

Child View D

{

_parent:

_proto:

}

Child View C

{_parent:

_proto:

}

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