Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 600)

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CHAPTER 16

Find

16-12 Using the Find Service

The full complement of slots in the ﬁnder frame resulting from your searches

varies according to the ﬁnder proto it’s based on. A ﬁnder frame based on the

ROM_SoupFinder proto returns a finder containing a cursor with which to

retrieve found items from the application soup. A ﬁnder frame based on the

ROM_CompatibleFinder proto results in a frame containing an array of the

actual found items.

The ROM_CompatibleFinder proto is meant to serve as a guideline for creating

a ﬁnder that works on a data storage set that does not use soups. The methods

included must be overridden to ﬁt the data type in which your application data

is stored.

Several methods and slots are included by both system protos; they include:

■ The selected array stores selected items from the Find overview in an

internal format. All you can do is pass the array to the

Length function to

determine the number of selected items.

■ The Count method returns an integer with the total number of found items.

■ The Resync method resets the ﬁnder to the ﬁrst found item.

■ The ShowFoundItem method displays the overview data item that resides in

the overview’s items array.

■ The ShowOrdinalItem method displays an item based on the ordinal number

or symbol (

'first, 'prev, or 'next) passed to it.

Whenever possible, you should store your application’s data in soups and use the

ROM_SoupFinder proto to support the Find service, as shown in the following

code fragment:

if cursor:Entry() then begin

myFinder := {

_proto: ROM_SoupFinder,

owner: self,

title:"My Application",

findType:'text, //other possible values are

//'dateBefore,'dateOn, and 'dateAfter

findWords: [searchedForTheseStrings],

cursor: myCursor,};

Table 16-1 provides quick reference descriptions of the ROM_SoupFinder

methods. Most should not be overridden, but those that may be are indicated.

1 2 ... 595 596 597 598 599 600 601 602 603 604 605 ... 941 942

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