A Panel is a widget container which can be located on any side of the desktop. There can be multiple panels on the same side. The default layout is one panel that stretches across the entire bottom of the desktop with the following widgets: application menu, desktop pager, task manager (list of open windows), system tray (including things like a device notifier) and clock. If you are using a laptop, netbook or other computer that uses a battery there will also be a power management widget in the system tray. At the end of the panel is a toolbox button which can be activated to access configuration options.
The panel can then be configured by clicking on the toolbox located on the right for horizontal or bottom for vertical panel. At that point, the panel will be in configuration mode. Panel configuration may also be accessed via the context (right click) menu in the panel.
Widgets in the panel can be sorted by dragging them when in configuration mode. Widgets align left in the horizontal and top in the vertical panel
Should anything "untoward" happen to your panel have a look at ~/.kde(4)/share/config/plasma-desktop-appletsrc - the panel itself is classed as a containment (there are at least two, the desktop and the panel) which is home to all the different widgets you put there.
|Here the relevant section of plasma-desktop-appletsrc for a default panel containment should go. Please help us provide the info if you know anything about this.|
It is also possible to have more than one panel on your desktop. This proves useful if you want to have a more flexible layout:
To add a new panel either click on the desktop toolbox button and selector open the context (right click) menu on the desktop and select from the menu.
If more than one kind of Panel is installed, you will be able to select between them to choose what sort of Panel you would prefer. By default, two Panel types are available:, which creates a Panel containing all of the default widgets (launcher, pager, tasks, system tray, clock, etc.), and , which adds an empty Panel without any pre-configured widgets in it.
The panels and desktop may be locked to prevent changes being made to them. When locked, the toolbox buttons will not be shown on either the desktop or on the panels. To configure a panel, it must be unlocked, otherwise the toolbox and context menu entries to configure or add widgets are unavailable.
Locking can be done by either selecting theentry in the Panel toolbox's menu or in the Panel context (right click) menu. Once locked, the Panels can be unlocked again by right clicking on either a panel or desktop and selecting from the menu that is displayed.