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Scrollbars serve a critical need in the modern GUI they enable smallish rectangles (i.e., windows or panes) to meaningfully contain large amounts of information. Unfortunately, they are also typically quite frustrating, difficult to manipulate, and wasteful of pixels. The scrollbar is, without a doubt, both overused and underexamined. In its role as a window content and document navigator a display control its application is appropriate. The singular advantage of the scrollbar aside from its near universal availability is that it provides useful context about where you are in the window. The scrollbar s thumb is the small, draggable box that indicates the current position, and, often, the scale of the territory that can be scrolled. Many scrollbars are quite parsimonious in doling out information to users. The best scrollbars use thumbs that are proportionally sized to show the percentage of the document that is currently visible, as well as:

How many pages there are in total The page number (record number, graphic) as we scroll with the thumb The first sentence (or item) of each page as we scroll with the thumb

2 3 4 5 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

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The rehabilitation of Watauga Hall was bid on December 5, 1983, with eight general contractors participating. The low bid for general construction was $1,440,550, with all bid alternates taken. The general, plumbing, electrical and mechanical low bid total was $2,016,209, or approximately 8 percent below the architect s estimate. The new structural system selected for Watauga Hall consisted of a twoway at-plate cast-in-place reinforced concrete slab supported by steel tube section columns with shear heads. The concrete slab was placed on the existing timber oor surface to be used as a temporary form.

Additionally, many scrollbar implementations are stingy with functions. To better help us manage navigation within documents, they should give us powerful tools for going where we want to go quickly and easily, such as:

Buttons for skipping ahead by pages/chapters/sections/keywords Buttons for jumping to the beginning and end of the document Tools for setting bookmarks that we can quickly return to

0 0 0 0 3.08 -4.16 1.48 4.74 2.10 -1.84 -2.65 1.27 -10.74 0.68 - 3.15 5.02 -4.59 4.07 4.83 0.33 -6.41 -8.87 -4.67 -3.06 -8.86 0.53 -7.03 -12.50 -2.74 - 10.51 0.78 0.52 -7.03 -6.44 - 10.46 0.12 -2.46 1.78 -0.86 -8.08 -1.54 -0.98 - 18.36 -3.94 1.18

Shortcomings in contextual information aside, one of the biggest problems with scrollbars is that they demand a high degree of precision with the mouse. Scrolling down or up in a document is generally much easier than scrolling down and up in a document. You must position the mouse cursor with great care, taking your attention away from the data you are scrolling. Some scrollbars replicate both their up and down nudge arrows at each end of the scrollbar; for windows that will likely stretch across most of the screen, this can be helpful; for smaller windows, such replication of controls is probably overkill and simply adds to screen clutter (see 19 and Figure 19-1 for more discussion of this idiom). The ubiquity of scrollbars has unfortunately resulted in some unfortunate misuse. Most significant here is their shortcomings in navigating time. Without getting too philosophical or theological, we can all hopefully agree that time has no meaningful beginning or end (at least within the perception of the human mind). What, then, is the meaning of dragging the thumb to one end of a calendar scrollbar (See Figure 21-21).

The steel columns were threaded through openings cut into the existing oors and braced prior to placing reinforcing and concrete. The existing timber joists were also supported with additional shoring placed at mid-span locations. The steel columns were carried down to new isolated column footings in the basement or crawl space.

1 0 0 0 18.71 -42.68 15.67 35.57 16.43 - 14.42 - 11.21 3.88 -66.75 12.57 - 13.78 38.48 -20.88 30.51 31.87 -1.62 -41.11 -63.85 - 27.65 - 20.46 -62.04 8.62 -41.01 -80.29 -15.50 -66.23 6.80 -0.15 - 45.58 - 38.57 -70.71 -5.97 -20.20 7.80 -8.91 -55.53 - 15.58 -10.86 - 117.48 - 25.17 6.25

Figure 21-21 This image shows a limitation of using a scrollbar for navigating the endless stream of time. Dragging the thumb all the way to the end of the scrollbar brings a user one year into the future. This seems a bit arbitrary and limiting.

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