When this feature is implemented on a touchscreen it is called kinetic scrolling. Adobe Reader has a mode identified by a small hand icon (" hand tool") on the document, which can then be dragged by clicking on it and moving the mouse as if sliding a large sheet of paper. Some software supports other ways of scrolling. Some computer mice have a scroll wheel, which scrolls the display, often vertically, when rolled others have scroll balls or tilt wheels which allow both vertical and horizontal scrolling. Typically certain keys or key combinations page up or down on PC-compatible keyboards the page up and page down keys or the space bar are used earlier computers often used control key combinations. Scrolling displays often also support page mode. Older computer terminals changed the entire contents of the display one screenful ("page") at a time this paging mode requires fewer resources than scrolling. Scrolling is often supported by text user interfaces and command line interfaces. In a WIMP-style graphical user interface (GUI), user-controlled scrolling is carried out by manipulating a scrollbar with a mouse, or using keyboard shortcuts, often the arrow keys. This was especially common in 8 and 16bit video game consoles.
Some systems feature hardware scrolling, where an image may be offset as it is displayed, without any frame buffer manipulation (see also hardware windowing). Scrolling is often carried out on a computer by the CPU ( software scrolling) or by a graphics processor. When frame rate is a limiting factor, one smooth scrolling technique is to blur images during movement that would otherwise appear to "jump".Ĭomputing Implementation It is related to scrolling in that changes to text and image position can only happen as often as the image can be redisplayed. Frame rate is the speed at which an entire image is redisplayed. Scrolling may take place in discrete increments (perhaps one or a few lines of text at a time), or continuously ( smooth scrolling). Scrolling may take place completely without user intervention (as in film credits) or, on an interactive device, be triggered by touchscreen or a keypress and continue without further intervention until a further user action, or be entirely controlled by input devices. A common television and movie special effect is to scroll credits, while leaving the background stationary. "Scrolling," as such, does not change the layout of the text or pictures but moves ( pans or tilts) the user's view across what is apparently a larger image that is not wholly seen. In computer displays, filmmaking, television production, and other kinetic displays, scrolling is sliding text, images or video across a monitor or display, vertically or horizontally.
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