Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 93)

100

101

CHAPTER 3

Views

About Views 3-9

Opening and closing animation effects

The

viewEffect slot deﬁnes an animation to be performed

when the view is displayed or hidden.

Other attributes Some other slots deﬁne view characteristics such as font,

copy protection, and so on.

Inheritance links The

_proto, _parent, viewChildren, and

stepChildren slots contain links to a view’s template,

parent view, and child views.

These different categories of view characteristics are described in the following

sections.

Class 3

The viewClass slot deﬁnes the view class. This information is used by the

system when creating a view from its template. The view class describes the type

of graphic object to be used to display the data described in the template. The view

classes built into the system serve as the primitive building blocks from which all

visible objects are constructed. The view classes are listed and described in Table 2-2

(page 2-4) in the Newton Programmer’s Reference.

Behavior 3

The viewFlags slot deﬁnes behavioral attributes of a view other than those that

are derived from the view class. Each attribute is represented by a constant deﬁned

as a bit ﬂag. Multiple attributes are speciﬁed by adding them together, like this:

vVisible+vFramed

Note that in the NTK viewFlags editor, multiple attributes are speciﬁed simply by

checking the appropriate boxes.

Some of the viewFlags constants are listed and described in Table 2-4 (page 2-11)

in the Newton Programmer’s Reference. There are also several additional constants

you can specify in the

viewFlags slot that control what kinds of pen input (taps,

strokes, words, letters, numbers, and so on) are recognized and handled by the view.

These other constants are described in “Recognition” (page 9-1).

View behavior is also controlled through methods in the view that handle system

messages. As an application executes, its views receive messages from the system,

triggered by various events, usually the result of a user action. Views can handle

system messages by having methods that are named after the messages. You

control the behavior of views by providing such methods and including code that

operates on the receiving view or other views.

For a detailed description of the messages that views can receive, and information

on how to handle them, see “Application-Deﬁned Methods” (page 3-26).”

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 941 942

Komentáře k této Příručce

Žádné komentáře

Apple Newton Utilities Uživatelská příručka Strana 93

Komentáře k této Příručce

Související produkty a manuály pro Software Apple Newton Utilities