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context menu
A context menu (also called contextual, shortcut, and popup or pop-up menu) is a menu in a graphical user interface (GUI) that appears upon user interaction, such as a right-click mouse operation. A context menu offers a limited set of choices that are available in the current state, or context, of the operating system or application. Usually the available choices are actions related to the selected object. From a technical point of view, such a context menu is a graphical control element.
==History==
Context menus first appeared in the Smalltalk environment on the Xerox Alto computer, where they were called ''pop-up menus.'' The NEXTSTEP operating system further developed the idea, incorporating a feature whereby the right or middle mouse button brought the main menu (which was vertical and automatically changed depending on context) to the location of the mouse, thereby eliminating the need to move the mouse pointer all the way across the large (for the time) NextStep screen.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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