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Cursor (computers)




In computing, a cursor is an indicator used to show the position on a Computer Monitor or other Display Device that will respond to input.

In most Command Line Interface s, the cursor is a blinking Underscore or solid rectangle, indicating where text will be placed when entered. For example, a typical MS-DOS prompt appears as:

C:\> _

Some interfaces use an underscore to indicate that the user is in insert mode, where text will be inserted in the middle of the existing text, and a larger block to indicate that the user is in Overtype mode, where inserted text will overwrite existing text.

Interfaces driven by a Computer Mouse or other Pointing Device add a second cursor to show the current position of the mouse pointer. In Text User Interface s, such as early versions of Microsoft Windows , this cursor is frequently a solid rectangle; depending on the interface, the rectangle may always be a single color, or may be the opposite color of whatever lies "below" it. Graphical User Interface s usually use an arrow-like pointer to show the mouse position, and a solid line as a text insertion point. (Some users refer to the insertion-point cursor as a '' Caret '' to distinguish it from the mouse cursor; others use the terms mouse ''pointer'' and text ''cursor'' to likewise disambiguate.) The blinking of the text cursor is usually temporary suspended when it is being moved; otherwise, the cursor may change position when it is not visible, making its location difficult to follow. Many TUI s and GUI s give the user the option to turn off the mouse cursor when text is being typed.

In many GUIs, the mouse cursor changes shape depending on the circumstances. For example:
  • In text that the user can select or edit, the cursor changes to a vertical bar with little cross-bars (or curved Serif -like extensions) at the top and bottom - sometimes called an "I-beam" since it resembles the cross-section of the construction detail of the same name.

  • When displaying a document, the cursor can appear as a hand with all fingers extended allowing scrolling by "pushing" the displayed page around.

  • Graphics-editing cursors such as brushes, pencils or paint buckets may display when the user edits an image.

  • On an edge or corner of a Window the cursor usually changes into a double arrow (horizontal, vertical, or diagonal) indicating that the user can drag the edge/corner in an indicated direction in order to adjust the shape of the window.

  • While a computer process is performing tasks and cannot accept user input, a wait cursor (an Hourglass in Windows and many other systems, Watch in classic Mac OS , or spinning ball in Mac OS X ) is displayed when the mouse cursor is in the corresponding window.


  • When the cursor hovers over a Hyperlink , it changes into a hand with an outstretched index finger. Often some informative text about the link may pop up in a Tooltip , which disappears when the user moves the cursor away. The tooltips revealed in the box depend on the implementation of the Web Browser ; many web browsers will display the "title" of the element, the "alt" attribute, or the non- Standard "tooltips" attribute. This cursor shape was first used for hyperlinks in Apple Computer's HyperCard .



SEE ALSO


  • Susan Kare , designer of several of the common cursor shapes