Apple Newton Utilities User's Guide download pdf (Page 783)

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CHAPTER 21

Routing Interface

Using Routing 21-35

not provide a view deﬁnition, and there are no other view deﬁnitions available for

that data class, the In/Out Box displays a generic blank view for the item. Items

formatted with the

'view data type do not need a separate view deﬁnition because

the In/Out Box itself provides a page preview view for these items.

Of the view deﬁnitions registered by your application, you can identify which

should be made available to the In/Out Box and which should be hidden from the

In/Out Box, by setting the

protection slot in the view deﬁnition. Set the

protection slot to 'public to make the view definition available to the In/Out

Box. Set the

protection slot to 'private to hide the view deﬁnition from the

In/Out Box.

If more than one view deﬁnition is available to the In/Out Box for viewing an item,

the In/Out Box lets the user choose which view they want to see.

Note that view deﬁnitions for In Box items are opened by the In Box in a read-only

state. That is, if the view deﬁnition is of the type

'editor, the user won’t be able

to edit existing ﬁelds or write in new information. In other words, all child views

based on the

clParagraphView class are read-only. However, views can receive

and respond to taps; that is,

ViewClickScript messages are sent. If you want to

prevent your view deﬁnition from receiving all pen input, you can place a transparent

view of the

clView class over the top of it to catch any taps.

Out Box items are opened in a writable state, if they are normally writable; that is,

the Out Box does nothing special to prevent editing if the view is editable. You may

want to make your out box items writable or not, depending on whether or not you

want the user to be able to change them in the out box.

You can use the

newtEntryView method EntryCool to test if an item in the

In/Out Box is writable or not. This method returns

nil for all In Box items, since

they are read-only.

Note also that application view deﬁnitions used in the In/Out Box must not expect

data deﬁned within the context of the application.

For more information about writing and registering view deﬁnitions, refer to

Chapter 5, “Stationery.” Note that the In/Out Box does not need data deﬁnitions,

only view deﬁnitions.

View Deﬁnition Slots 21

View deﬁnitions to be used by the In/Out Box have other slots of interest besides

the

target slot.

One other slot of interest is named

fields. When the view is open, the fields

slot contains a reference to the In/Out Box entry. If the entry has a

body slot and

the

body slot contains a frame with a class slot, then the In/Out Box sets

target to the body slot of the entry. This allows view definitions written for your

application to be used by the In/Out Box without modiﬁcation. If you need to

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Apple Newton Utilities User's Guide Page 783

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