The Lister

Listers are what you might call the Opus "main window" - in a traditional file manager, they would be the main (or only) window. The name Lister derives from the original Opus on the Amiga computer (20 years ago!). Listers were much simpler then, doing nothing much more than displaying a list of files and folders - and what do you call something that lists things? A lister!

These days the Opus Lister contains multiple configurable user-interface elements that let you access various program functionality. At their core though they still display lists of files and folders, and indeed this is the only functionality of a Lister that can't be disabled.
 

basic_lister.png 
 

Above is a screenshot of a fairly simple Lister using the default Opus configuration. The two default toolbars are visible at the top of the Lister, then below this are the folder tree (on the left), and the file display on the right. The file display has a third toolbar at the top of it. The folder tree indicates that drive C: has been selected and indeed, you can see that the contents of drive C: are shown in the file display to the right of the tree. Note the folder tab displayed at the bottom of the file display - currently, only one tab is open (the one showing C:) but you can open as many folders as you like each in their own tab, and rapidly switch between them.

At the  bottom of the file display is the status bar, which displays some summary information about the folder shown in the file display. The information displayed on the status bar can be configured through the Preferences system.

 

You might think from that image that a Lister is basically the same as Explorer - in which case, what's the point of Opus? In fact, Opus has been deliberately designed to resemble Explorer in its default configuration. This provides a sense of familiarity for new users first switching from Explorer - if you've used Explorer before you can instantly start using Opus in the same way, and learn more about its additional functionality and configurability as you go.

 

biglister.png 

This screenshot illustrates a much more complex Lister, and immediately you can see that the resemblance to Explorer is only superficial. The key user interface elements visible in this screenshot are: