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Volume 6A: Motif Programming Manual
book

Volume 6A: Motif Programming Manual

by David Brennan, Dan Heller, Paula Ferguson
September 1993
Intermediate to advanced content levelIntermediate to advanced
1014 pages
28h 26m
English
O'Reilly Media, Inc.
Content preview from Volume 6A: Motif Programming Manual
14 The Scale Widget
This chapter describes how to use the Scale widget to represent a range of values. The widget can be manipulated to
change the value.
The Scale widget displays a numeric value that falls within upper and lower bounds. The widget allows the user to
change that value interactively using a slider mechanism similar to that of a ScrollBar. This style of interface is useful
when it is inconvenient or inappropriate to have the user change a value using the keyboard. The widget is also
extremely intuitive to use; inexperienced users often understand how a Scale works when they first see one. the figure
shows how a Scale can be used with other widgets in an application.
A Scale widget in an application
A Scale can be oriented either horizontally or vertically. The values given to a Scale are stored as integers, but decimal
representation of values is possible through the use of a resource that allows you to place a decimal point in the value.
A Scale can be put in output−only mode, in which it is sometimes called a gauge. When a Scale is read−only, it
implies that the value is controlled by another widget or that it is being used to report status information specific to the
application. The standard way to create a read−only Scale is to specify that it is insensitive. Unfortunately, this
technique has the side−effect of graying out the widget. One workaround is to create a Scale ...
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Publisher Resources

ISBN: 9780596000431