Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 574)

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CHAPTER 15

Filing

15-8 About Filing

on the internal store, the external store or both; that is, the user can specify a stores

ﬁlter in addition to a labels ﬁlter. Figure 15-8 shows the folder tab picker in a view

based on the

protoClockFolderTab proto.

Figure 15-8 Choosing a ﬁling ﬁlter

To display items according to the user’s choice of store, your target view must

supply a

storesFilter slot. When the target view has a storesFilter slot

and more than one store is available, the folder tab views allow the user to specify a

store in addition to a folder from which data items are retrieved for display. For

example, the user might choose to display only entries in the

'business folder

on the internal store.

When the user chooses any ﬁlter from this picker, the system updates the

storesFilter or labelsFilter slot and sends the target view a

NewFilingFilter message. The argument passed to this method by the system

tells you what changed—the stores ﬁlter or the labels ﬁlter—but not its new value.

You must supply a

NewFilingFilter method that examines the

storesFilter or labelsFilter slot and queries your application’s soups

appropriately. If the value of the

labelsFilter slot is nil, your

NewFilingFilter method must display all target items. Similarly, if

the value of the target view’s

storesFilter slot is nil, your

NewFilingFilter method must display items on all available stores.

Your

NewFilingFilter method must also perform any other actions

necessary to display the appropriate data, such as redrawing views affected by

the new ﬁlter value.

You can use the

RegFolderChanged function to register your own callback

function to be executed when the user adds, deletes, or edits folder names. You

cannot respond adequately to these kinds of changes from within your

NewFilingFilter or FileThis methods alone.

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