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Newton Technology Journal June 1996

symbol slot in that

dataDef

. See the Newton Programmer’s Guide for

more information on the required slots for

dataDefs

. The

allDataDefs

frame can explicitly list a set of frames and/or it can reference NTK layouts

using the

GetLayout(filename)

function.

The allViewDefs Slot

The

allViewDefs

slot is where the

viewDefs

are linked to the

dataDefs

in your application. This includes any print or other routing

formats you wish to use. The structure of this frame parallels the

allDataDefs

slot. For each

dataDef

slot in

allDataDefs

you need a

frame which contains the

viewDefs

for that

dataDef

. Aside from the

stationery requirement that one of the

viewDefs

must be named default,

you are free to associate as many

viewDefs

with a single

dataDef

as you

like. For example, if an

allDataDefs

slot contains:

{ dataDef1: GetLayout(“dataDef1”),

dataDef2: GetLayout(“dataDef2”)},

then a matching

allViewDefs

slot might look like:

{ dataDef1:{default:GetLayout(“dd1DefaultViewDef”),

notes: GetLayout(“notesViewDef”),

frameFormat: protoFrameFormat},

dataDef2:{default: GetLayout(“dd2DefaultViewDef”),

frameFormat: protoFrameFormat}}

Note that for beaming and mailing, you can use the system-supplied

protoFrameFormat

which provides routing for free. Also, notice that

you don’t have to specify the same number of

viewDefs

for each

dataDef

. Even if the application is currently displaying an item with a

viewDef

, but that

viewDef

isn’t available for another item, the NewtApp

framework will switch to the default

viewDef

when needed. In addition,

the

newtShowStationeryButton

will only list the

viewDefs

available for the currently displayed item.

THE LAYOUT LEVEL

When we refer to layouts in NewtApp, we don’t mean layouts in the NTK

sense. Yes, the layouts in a NewtApp are NTK layout files, but so are the

other levels of a NewtApp. In NewtApp the layout layer controls the general

appearance of your application, so it may help to think of them as the “visual

layout” of the application. NewtApp supports two layouts in an application.

These are the layouts enumerated in the allLayouts slot of the application

layer, and are called default and overview. The default layout is used to show

the individual entries in your application soup, and the overview layout

provides the familiar Newton overview of your soup. Currently there are

three protos for the default layout, and two protos for the overview layout.

Which protos are used depends on the flavor of application you are building

– card, page or roll.

The most important slot to set in the layout proto is the

masterSoupSlot

. This slot contains the name of one of the slots from

the

allSoups

frame in the application base view. In the example from in

the

allSoups

section, the layouts would have a

masterSoupSlot

‘appSoup

. In addition, if you use the

statusBarSlot

mechanism of the

application base layer, then you can create

menuLeftButtons

and

menuRightButtons

at this level to replace the status bar buttons. Other

key slots and methods are outlined in the Newton Programmer’s Guide and

demonstrated in the DTS sample code. One handy method to remember is

DoRetarget()

. This method will update the layout from the soup data.

So, if you need to advance to a particular entry, you can go to the entry in

soup referenced by a layout’s

masterSoupSlot

and call

DoRetarget()

to update the views.

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