Apple Newton Utilities Guia do Utilizador descarregar pdf (Página 579)

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101

CHAPTER 15

Filing

Using the Filing Service 15-13

Specifying the Target 15

The GetTargetInfo method identiﬁes the current target and target view to the

system. Depending on your needs, you can use the default version of this method

or override it.

If you use the default version, your application’s base view must supply

target

and

targetView slots that you update whenever the target or target view

changes. If you override this method, you provide these slots in the result frame

that it returns, rather than in your application’s base view. These slots provide the

same information regardless of whether they reside in the

GetTargetInfo

method’s result frame or in the application’s base view.

Creating the Target Slot 15

The target slot contains the data item with which the user is working, such as the

soup entry that represents the currently displayed note to ﬁle. If there is no active

item, this slot must have the value

nil.

Your application must update the value of the

target slot every time the user

views a new item. Because the selection of a new item is an application-speciﬁc

detail, it is difﬁcult to recommend a means of updating this slot that is appropriate

for every application; however, it is common to update the value of this slot from

the

ViewClickScript method of the active view.

Creating the TargetView Slot 15

The targetView slot contains the view that receives messages from the Filing

service and can manipulate the target. The application’s base view is usually an

appropriate value for this slot.

Overriding the GetTargetInfo Method 15

You can implement your own GetTargetInfo method if the default version

supplied by the system is not suitable for your application’s needs. For example, if

your application images data items in ﬂoating windows or displays more than one

data item at a time, you probably need to supply a

GetTargetInfo method that

can return an appropriate target and target view in those situations.

You must override the

GetTargetInfo method in order to move an item to

another store when it is ﬁled. The result frame returned by your

GetTargetInfo

override can include an optional

targetStore slot that speciﬁes the store on

which an item is to reside when it is ﬁled.

To override this method, create in your application base view a slot named

GetTargetInfo and implement this method as specified in the description of

the

GetTargetInfo method (page 12-11) in

Newton Programmer’s

Reference

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