Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 912)

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GLOSSARY

GL-4

item frame The frame that encapsulates a

routed (sent or received) object and that is stored

in the In/Out Box soup.

lexical dictionary A list of valid grammars,

each specifying the format of an entity to be

recognized, such as a date, time, phone number

or currency value. See also enumerated

dictionary and grammar.

line A shape deﬁned by two points: the current

x and y location of the graphics pen and the x

and y location of its destination.

local A variable whose scope is the function

within which it is deﬁned. You use the local

keyword to explicitly create a local variable

within a function.

magic pointer A constant that represents a

special kind of reference to an object in the

Newton ROM. Magic pointer references are

resolved at run time by the operating system,

which substitutes the actual address of the ROM

object for the magic pointer reference.

meeting An entry in the Dates application for

a speciﬁc time during the day. People can be

invited and the meeting can be scheduled for a

particular location.

message A symbol with a set of arguments. A

message is sent using the message send syntax

frame:messageName(), where the message

messageName is sent to the

receiver frame.

method A function object in a frame slot that

is invoked in response to a message.

name reference A frame that contains a soup

entry or an alias to a soup entry, often, though

not necessarily, from the Names soup. The

frame may also contain some of the individual

slots from the soup entry.

NewtonScript heap An area of RAM used by

the system for dynamically allocated objects,

including NewtonScript objects.

nil A value that indicates nothing, none, no,

or anything negative or empty. It is similar to

(void*)0 in C. The value nil represents

“false” in Boolean expressions; any other value

represents “true.”

object A typed piece of data that can be an

immediate, array, frame, or binary object. In

NewtonScript, only frame objects can hold

methods and receive messages.

option frame A frame passed as a parameter

to an endpoint method that selects the

communication tool to use; controls its

conﬁguration and operation; and returns result

code information from the endpoint method.

origin The coordinates of the top-left corner

of a view, usually (0, 0). The origin can be

shifted, for example, to scroll the contents of

a view.

output spec A special type of callback spec

used with an endpoint method. An output spec

contains a few additional slots that allow you to

pass special protocol ﬂags and to deﬁne how the

data being sent is translated.

oval A circular or elliptical shape deﬁned by

the bounding rectangle that encloses it.

package The unit in which software can be

installed on and removed from the Newton.

A package consists of a header containing the

package name and other information, and one or

more parts containing the software.

package ﬁle A ﬁle that contains downloadable

Newton software.

package store See store part.

parent A frame referenced through the

_parent slot of another frame. With regard to

views, a parent view encloses its child views.

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