XView is awidget toolkit fromSun Microsystems introduced in 1988. It provides anOPEN LOOK user interface forX Window System applications, with an object-orientedapplication programming interface (API) for theC programming language. Its interface, controls, and layouts are very close to that of the earlierSunView window system, making it easy to convert existing applications from SunView to X. Sun also produced theUser Interface Toolkit (UIT), aC++ API to XView.
The XView source code has been freely available since the early 1990s, making it the "firstopen-source professional-quality X Window System toolkit".[1] XView was later abandoned by Sun in favor ofMotif (the basis ofCDE), and more recentlyGTK+ (the basis ofGNOME).
XView was reputedly the first system to use right-buttoncontext menus,[1] which are now ubiquitous among computer user interfaces.