Datasheet

Working Common Controls
Throughout your work in Windows, you’ll be presented with various controls
on the screen. A control on the screen is like a control in a car. For example,
in a car, the brake is a control you work with your foot. The steering wheel is a
control you work with your hands, as are the controls for the radio, windshield
wipers, and headlights. In Windows, the controls on your screen are things you
work with your mouse or keyboard. In this section we’ll look at some examples
of controls you’re likely to come across in Windows quite often.
Using Scroll Bars
Scroll bars appear on your screen whenever there’s more text, or more infor-
mation, than will fit in the space available. The scroll bar allows you to scroll
around and see any text that’s not currently visible. There are vertical scroll
bars that let you move up and down and horizontal scroll bars for moving left
and right. The scroll bar has buttons at either end, and a scroll box within it,
as shown in Figure 1-14.
Figure 1-14: Horizontal and vertical
scroll bars
The size of the scroll box relative to the size of the scroll bar tells you roughly
how much information is currently out of view. For example, looking at the ver-
tical scroll bar in Figure 1-14, you can see that the scroll box occupies about
the top 25 percent of the scroll bar. That means that currently you’re viewing
only the top 25 percent of whatever text is shown to the left of the scroll bar.
To scroll through text that’s out of view, use the scroll bar to scroll down. To
operate the scroll bar using your mouse:
✦ Click the button at the bottom to scroll down one line.
✦ Click the button at the top to scroll up one line.
✦ Click an empty area on the scroll bar, beneath the scroll box, to move
down a page.
Scroll box
Scroll bar
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