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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