Drag and Drop - Actions

Actions

The basic sequence involved in drag and drop is:

  • Move the pointer to the object
  • Press, and hold down, the button on the mouse or other pointing device, to "grab" the object,
  • "Drag" the object to the desired location,
  • "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. Extended dragging and dropping (as in graphic design) can stress the mousing hand.

A design problem appears when the same button selects and drags items. Imprecise movement can cause a dragging when the user just wants to select.

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.

Read more about this topic:  Drag And Drop

Famous quotes containing the word actions:

    “To have the fear of God before our eyes, and, in our mutual dealings with each other, to govern our actions by the eternal measures of right and wrong:MThe first of these will comprehend the duties of religion;Mthe second, those of morality, which are so inseparably connected together, that you cannot divide these two tables ... without breaking and mutually destroying them both.”
    —Laurence Sterne (1713–1768)

    “We should often be ashamed of our finest actions if the world understood all the motives behind them.”
    —François, Duc De La Rochefoucauld (1613–80)

    “I also believe that few people remain completely untouched by the thought that instead of the life they lead there might also be another, where all actions proceed from a very personal state of excitement. Where actions have meanings, not just causes. And where a person, to use a trivial word, is happy, and not just nervously tormenting himself.”
    —Robert Musil (1880–1942)