Apple Computer Network Router 2 User Manual download pdf (Page 87)

CHAPTER 2

Container Views

How Views Work 2-43

Automatic Scrolling 2

In the discussions of scrolling behavior and appearance in the previous

sections, the user controls scrolling by deciding which scroll arrow to use

and how long to use it. Most of the time the user should be in control, but

sometimes an application should scroll a view automatically. When your

application performs an operation and the effect is to select something that’s

not currently visible, your application must scroll to show the new selection.

For example, when the user searches for some text, your application locates

the desired text. If this text appears in a part of the information that isn’t

currently visible, your application should scroll the information to show

the found text. Figure 2-36 shows the effect of automatic scrolling in the

Names File.

Figure 2-36 Automatic scrolling

An application should not scroll automatically any more than is necessary to

bring a selection into view. Users want to control what shows in a scrollable

view. If part of a selection is showing in the view after the user performs an

operation, don’t scroll at all. For example, if the user increases the text size of a

lengthy selection so that the bottom part extends out of view, your application

should not automatically scroll to the end of the selection.

1. Before the search for Mercedes 2. After the search for Mercedes

1 ... 86 87 88 ... 307

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Apple Computer Network Router 2 User Manual Page 87