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| Trees |
Many different parts
of the Windows XP interface are represented by hierarchical trees,
like the one in Figure 3-33. This collapsible tree
interface can be found in Explorer (representing drives and folders),
the Registry Editor (representing Registry keys), and Device Manager
(representing installed devices).
Figure 3-35. The Folder Tree is an efficient and useful way to visualize and navigate the hierarchy of your filesystem
take too much time, and would certainly be unwieldy. Instead,
branches are "collapsed" and only
the top levels are shown; you can expand any branch by clicking the
plus sign (+), and then collapse any branch by clicking the
corresponding minus sign (-). You can also double-click any branch to
expand it, and again to collapse it. If no plus sign (+) appears,
then the entry has no "children"
and cannot be expanded further.Navigating trees with the
keyboard is often more convenient
than using the mouse. As with listboxes (discussed earlier in this
chapter), you can jump to any branch by typing the first letter (or
first few letters) of its name. This works regardless of the depth of
the entry, but only on entries that are currently visible. Use the
right arrow key to expand the currently selected branch, or the left
arrow key to collapse it; if the branch is already collapsed, the
left arrow key jumps to the parent. The Backspace key also jumps to
the parent, but it never collapses branches. Finally, the asterisk
key (*) expands all branches from the current location.
