Apple Newton Utilities Guia do Utilizador descarregar pdf (Página 568)

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CHAPTER 15

Filing

15-2 About Filing

Your application must provide a target view that can manipulate the target. The

target view is usually the same view that images the target data. Although the

application base view is often an appropriate target view, it may not be under all

circumstances. For example, each of these common situations has specialized

targeting needs:

■ Most applications allow the user to ﬁle and move multiple data items from

within an overview view. In this situation, the target may consist of multiple

items, and the overview view is usually the appropriate target view.

■ Applications that display more than one data item at a time, such as the built-in

Notes application, may need to specify which of several equal child views is

actually the target.

■ You might want the target view to be a ﬂoating window when one is present,

and the application’s base view at all other times.

You can override the system-supplied

GetTargetInfo method to vary the target

and target view according to circumstances.

Applications with less-elaborate targeting needs can use the default

GetTargetInfo method supplied by the system. To use the

default

GetTargetInfo method, your application base view must supply

target and targetView slots. You are responsible for updating the values

of these slots whenever the target changes; that is, whenever the data item on

display changes.

To ﬁle the target, the user taps a ﬁle folder button you provide. This view, which is

based on the

protoFilingButton system prototype, looks like a button with a

picture of a paper ﬁle folder on it. Figure 15-1 provides two examples of views

based on the

protoFilingButton system prototype.

Figure 15-1 Two examples of ﬁling button views

protoFilingButton

views

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