scroll bar

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scroll bar

[′skrōl ‚bär]
(computer science)
A horizontal or vertical bar that contains a box that is clicked and dragged up, down, left, or right in order to scroll the screen.

scroll bar

(graphics)
A widget found in graphical user interfaces and used to show and control ("scroll") which portion of a document is currently visible in a window. A window may have a horizontal or, most often, vertical scroll bar or both.

A vertical scroll bar is a narrow strip drawn up the side of the window containing a "bubble" whose position in the scroll bar represents the position of the visible part within the whole document. By dragging the bubble with the mouse the user can scroll the view over the entire document. Arrow buttons are usually provided at the end(s) of the scroll bar to allow the window to be scrolled by a small amount, e.g. one line of text, in either direction by clicking them with the mouse. Some programs provide a second pair of buttons for scrolling a page at a time or some other unit. Clicking on the scroll bar outside the bubble will either, depending on the particular WIMP, move the bubble to that point or move it some amount (typically a screenful) in that direction.

Different WIMP systems define different standards for whether scroll bars appear on the left or right, top or bottom of the window, and for their behaviour.

To reduce mouse movement, the up and down scroll buttons should either be next to each other at one end of the scroll bar (as in NEXTSTEP) or should reverse their effect when clicked with the right-hand mouse button (as in the X Window System and RISC OS). The fraction of the scroll bar filled by the bubble should indicate the fraction of the document visible in the window.

scroll bar

A vertical bar on the right side of a window or a horizontal bar at the bottom of a window that is used to move the window contents up and down or left and right. The bar contains a "thumb", which looks like an elevator in a shaft. When dragged with the mouse, the window contents move correspondingly. When the bar is clicked above or below the thumb, the contents are moved a page at a time. The arrows are clicked to move one line at a time.

Becoming Somewhat Obsolete
Since the advent of scroll mice, which use a wheel for vertical and horizontal scrolling, the scroll bar is being used less and less on desktop applications. In addition, tablet and smartphone content is scrolled by fingers, and a scroll bar was never a natural part of the interface. See scroll mouse.


Scroll Bars
Clicking in the bar or dragging the thumb moves the contents within the window. The Mac example (right) shows an optional variation that places both scroll arrows in the same vicinity to lessen mouse movement when switching directions.
References in periodicals archive ?
When the type of question was analyzed in relation to level of difficulty, the results showed that pictures occurred most frequently for students whose RIT level was lower than 176, and long passages with scroll bars occurred most frequently for students whose RIT level was higher than 186 (a 10.
We provide additional discussions of scroll bars in the example files.
Then under Window Options heading, uncheck 'Gridlines' and 'Row and column headers' as well as horizontal and vertical scroll bars.
This eliminates the need to use the scroll bars on the side and bottom of your browser window.
We'll show how to use three Excel tools--spinners, scroll bars and conditional formatting--to make forecast calculations a breeze.
Note, the Bernstein polynomials can be investigated with spinners and scroll bars as well (see www.
Participants were tested on four distinct tasks on the touch screen: (a) unstacked buttons, (b) stacked buttons, (c) horizontal scroll bars, and (d) vertical scroll bars.
Either that, or you accept that the less well endowed, screen-wise, will have to suffer scroll bars and you expand your canvas to 1024x768 and get a load of Web usability activists complaining you've infringed their human rights
Using separate, easy-to-use scroll bars for red, blue and green, the program lets you adjust colors and manipulate portions of the image so that you can select just the areas that you would like to change or delete.
However the open source community is concerned that the directive would take Europe a step closer to the US patent system whereby even basic elements of design such as horizontal scroll bars are patented.
The lack of scroll bars on the display means it's difficult to quickly pan from one region of the sky to another; Stella 2000's navigation buttons lack speed and efficiency.
If that isn't heresy enough, Tufte denounces the layering of information in favor of scroll bars.