Volume 7A: XView Programming Manual

10

Scrollbars

Scrollbars are used to change what you view in a subwindow. For instance, in a text subwin-

dow, scrollbars are used to scroll through a document. In a canvas subwindow, scrollbars can

be used to see another portion of the paint window (which can be larger than the canvas

subwindow). This chapter addresses specific functions of scrollbars themselves. These func-

tions are applicable to any XView package that has scrollbars attached. If you are interested

in how to utilize scrollbars for a particular package, you should consult the chapter that dis-

cusses that package.

OPEN LOOK describes scrollbars using the visual metaphor of an elevator riding on a cable,

which is attached at both ends to anchors. Figure 10-1 shows a scrollbar from the OPEN

LOOK

GUI Specification Guide.

Figure 10-1. An

OPEN LOOK

scrollbar

Scrollbars

Scrollbars 253

The elevator contains directional arrows and a drag box. A subwindow can have vertical or

horizontal scrollbars. Horizontal scrollbars are placed to the right of the subwindow while

vertical scrollbars are placed at the bottom. OPEN LOOK defines precisely how scrollbars

look and behave—the programmer or user cannot change it. All the programmer can control

is the scrollbar’s color, length, and various other common and generic attributes.

One of the functions of the scrollbar is the ability to split a view. The OPENWIN package pro-

vides objects such as text ...