Pointer (user interface)

Lore & Background

The pointer commonly appears as an angled arrow, historically because that improved appearance on low-resolution screens, but it can vary within different programs or operating systems. The pointer hotspot is the active pixel used to target a click or drag; the standard arrow pointer has the hotspot at the tip, while others may have it in the center or elsewhere. In many GUIs, moving the pointer around the screen may reveal other screen hotspots as the pointer changes shape depending on circumstances.

For example, in text that the user can select or edit, the pointer changes to a vertical bar with little cross-bars at the top and bottom, sometimes called an I-beam. When displaying a document, the pointer can appear as a hand with all fingers extended allowing scrolling by pushing the displayed page around. Graphics applications often display pointers such as brushes, pencils, or paint buckets depending on which tool is active.

On an edge or corner of a window, the pointer usually changes into a double arrow indicating that the user can drag the edge or corner to adjust the window size. While a computer process is performing tasks and cannot accept user input, a wait pointer is displayed, such as an hourglass in Windows before Vista, a spinning ring in Windows Vista and later, a watch in classic Mac OS, or a spinning pinwheel in macOS. When the pointer hovers over a hyperlink, a mouseover event changes the pointer into a hand with an outstretched index finger; this pointer shape was first used for hyperlinks in Apple Computer's HyperCard.

Reader's Guide

The pointer is a fundamental element of the WIMP style of interaction, enabling users to manipulate graphical user interface elements such as menus, buttons, scrollbars, and other widgets. Its design and behavior are shaped by principles like Fitts's law, which predicts that moving pointers to screen edges and corners is easy and fast because the pointer usually stops when reaching a screen edge, making those spots of virtual infinite size. The pointer's appearance changes contextually to provide visual feedback about available actions, such as indicating resizable edges, editable text, or clickable links. In Windows 7, with the introduction of Windows Touch, a touch pointer resembling a small diamond shape could be displayed instead of the mouse pointer, with visual feedback like a blue ripple on touch.

For pen input, the left-click ripple is colorless and the right-click ring is thinner. The pointer's role extends to repositioning the keyboard cursor, and its hotspot determines the precise point of interaction. The pointer's evolution from a simple arrow to a context-sensitive tool reflects its central role in making computer interfaces intuitive and responsive to user input.