March 2002
Intermediate to advanced
480 pages
18h 40m
English
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Name
Gauge
Synopsis
This class is an Item that can be used as either a progress
bar or a slider. The Gauge displays a fixed range of integer values
together with the current value. The maximum value of the range
and the initial value are set when the Gauge is constructed and may
subsequently be changed using the setMaxValue() and
setValue() methods. The minimum value is always implicitly zero.
In normal operation, the current value would probably start at zero and be updated
by application code by calling the setValue() method to reflect the
progress of an ongoing operation. In this mode, the Gauge operates
as a progress bar and its value cannot be changed by the user. To prevent the user
changing the value, the Gauge should be made non-interactive,
which can be done by setting the interactive constructor argument
to false. Note that this attribute cannot be changed once the
Gauge has been constructed, although its value can be obtained by
calling isInteractive().
To use the Gauge as a slider, it should be made interactive. In this
mode, the user can change the current value within the permitted range using a device-dependent
gesture. As the value changes, the Gauge notifies the
ItemStateListener for the Form
on which it is displayed,
which can retrieve the new value using the getValue() method.
Owing to display limitations, it may not be possible for every possible value in the allowed
range to be displayed and therefore the user may have to adjust the Gauge value several times ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.