Apple Newton Internet Enabler Especificaciones descargar pdf (Pagina 17)

these slot views include a label and can pop-up lists of potential values. The

miscellaneous slot views include the

newtEditView

and the

newtCheckBox

Slot views are implemented for many types of common data. Text,

integers, real numbers, symbols, and entire notes can be displayed and

edited by using the appropriate slot views. The names of the slot view

protos, while typically long and sometimes cumbersome, are good cues to

indicate where to use each one. For instance, it’s easier to know when to

use a

newtLabelPhoneInputLine

than to type it. In addition to the

data type being in the name, if the proto name contains the letters “

” (as

newtRONumberView

), this tells you that the proto is read-only and

can be used only to display data.

Despite their varying formats and capabilities, all slot views have a

common interface. All slot views use a path slot, which contains the path

reference to that slot view’s corresponding slot in the soup entry. This path

reference can be a simple symbol, like

‘myDataSlot

, or a path expression,

[pathExpr: ‘myClassFrame, ‘myDataSlot]

. They all

implement the

ReTarget

method, which forces a slot view to update its

view’s value from the value in the specified path. When any of the slot views

change, they all trigger the flush timer in the entry level. Most slot views

also implement a

JamFromEntry

method which is controlled by the

jamSlot

JAMMING

Jamming is the technique used by the slot views to incorporate data from

other soups’ entries in their own entry. Certain label-style slot views can

query another soup for the contents of their popup, or display a picker of

soup entries for the user to choose from. The most useful of these is

newtSmartNameView

. To use data from the built-in names soup in

your application, simply provide a

newtSmartNameView

. When the

user taps this slot view, the standard Names list picker appears. When the

user chooses a name from the picker, the current entry view in your

application is “jammed” with the chosen names entry. The

JamFromEntry(otherEntry)

method in each of your slot views is then

called.

JamFromEntry

checks to see if you’ve set the

jamSlot

for that

view. If

jamSlot

is not nil, it is used as a path expression in the foreign

entry. The contents of the slot view’s path are then replaced by the

contents of the foreign entry’s

jamSlot

. For example, if I wanted to

include the name and title of a customer in my application’s entry, I would

use a

newtSmartNameView

with a path of

‘customerName

. In

Newton Technology Journal June 1996

NTJ

If you have an idea

for an article

you’d like to write

for Newton Technology Journal,

send it via Internet to:

[email protected]

or AppleLink: NEWTONDEV

To request information on

or an application for

Apple’s Newton developer programs,

contact Apple’s Developer Support Center at

408-974-4897

or Applelink: NEWTONDEV

or Internet: [email protected]

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