Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 602)

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CHAPTER 16

Find

16-14 Using the Find Service

If your application does not store data as soup entries, you can use the

ROM_CompatibleFinder proto as the framework from which to create your

ﬁnder frame. Although

ROM_CompatibleFinder provides most of the services

that

ROM_SoupFinder does, it does not respond to messages sent by the system

when the user ﬁles, deletes, or moves items in the Find overview. The following

methods have the same deﬁnitions in the

ROM_CompatibleFinder as they have

in the

ROM_SoupFinder. If you use ROM_CompatibleFinder proto, in most

cases, you must deﬁne the following methods to work on your data structures:

■ FileAndMove

■ Delete

■ IsSelected

■ SelectItem

■ ForEachSelected

■ GetTarget

The commonality of deﬁnition between these methods causes problems in some

cases. For instance, when used with the

ROM_CompatibleFinder proto, the

ForEachSelected method must be overridden because it is expected to return

an array of soup entries.

The

ROM_CompatibleFinder proto has the two following methods which are

not found in the

ROM_SoupFinder proto:

■ ShowFakeEntry

■ ConvertToSoupEntry

When you use the ROM_CompatibleFinder proto, you should deﬁne a

ShowFakeEntry method that makes sure your application is open, and calls your

ShowFoundItem method.

The convenience method,

ConvertToSoupEntry, returns a soup entry when

given a data item as a parameter.

Implementing Search Methods 16

Your application conducts searches in response to messages that it receives from

the system. You must supply a search method for each message that your application

supports. These methods are usually deﬁned in your application’s base view;

they include:

■ Find

■ DateFind

■ FindTargeted

■ DateFindTargeted

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