Apple Newton Utilities Guia do Utilizador descarregar pdf (Página 116)

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101

CHAPTER 3

Views

3-32 Using Views

New Warning Messages 3

Warning messages are now printed to the inspector when a NewtonScript

application calls a view method in situations where the requested operation is

unwise, unnecessary, ambiguous, invalid, or just a bad idea.

Obsolete Functions and Methods 3

The following functions and methods are obsolete with version 2.0 of the Newton

System Software:

■ Confirm, which created and displayed an OK/Cancel slip. Use

AsyncConfirm instead.

■ DeferredConfirmedCall and DeferredConfirmedSend have both been

replaced by

AsyncConfirm.

Using Views 3

This section describes how to use the view functions and methods to perform

speciﬁc tasks. See “Summary of Views” (page 3-47) for descriptions of the

functions and methods discussed in this section.

Getting References to Views 3

Frequently, when performing view operations, you need access to the child or

parent views of a view, or to the root view in the system. You need to use the

ChildViewFrames and Parent methods as well as the GetRoot and GetView

functions to return references to these “related” views.

To test whether an application is open or not, for example, you can use the

GetRoot function and the application’s signature, together with the global

function

kViewIsOpenFunc:

call kViewIsOpenFunc with (GetRoot().appsignature)

The ChildViewFrames method is an important method you must use if you need

access to the child views of a view. It returns the views in the same order in which

they appear in the view hierarchy, from back to front. The most recently opened

views (which appear on top of the hierarchy) will appear later in the list. Views

with the

vFloating ﬂag (which always appear above nonﬂoating views) will be

at the end of the array.

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