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Drag and drop
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== Actions == The basic sequence involved in drag and drop is: * Move the [[pointer (computing WIMP)|pointer]] to the object * Press, and hold down, the button on the [[computer mouse|mouse]] or other [[pointing device]], to "grab" the object * "Drag" the object to the desired location by moving the pointer to this one * "Drop" the object by releasing the button Dragging requires more physical effort than moving the same pointing device without holding down any buttons. Because of this, a user cannot move as quickly and precisely while dragging (see [[Fitts' law]]). However, drag-and-drop operations have the advantage of thoughtfully chunking together two operands (the object to drag, and the drop location) into a single action.<ref>{{cite conference |author=Buxton, W. |title=Chunking and Phrasing and the Design of Human-Computer Dialogues |book-title=Proceedings of the IFIP World Computer Congress |year=1986 |pages=475–480 |url=http://www.billbuxton.com/chunking.html |url-status=dead |archive-url=https://web.archive.org/web/20040607162853/http://www.billbuxton.com/chunking.html |archive-date=7 June 2004}}</ref> Extended dragging and dropping (as in graphic design) can stress the mousing hand. A design problem appears when the same button [[selection (user interface)|select]]s and drags items. Imprecise movement can cause an attempt to select an object to register as a dragging motion. Another problem is that the target of the dropping can be hidden under other objects. The user would have to stop the dragging, make both the source and the target visible and start again. In classic Mac OS the top-of-screen menu bar served as a universal "drag cancel" target. This issue has been dealt with in [[Mac OS X]] with the introduction of [[Exposé (Mac OS X)|Exposé]].
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