As a feature, support for drag-and-drop is not found in all software, though it is sometimes a fast and easy-to-learn technique for users to perform tasks. However, the lack of affordances in drag-and-drop implementations means that it not always obvious that an item can be dragged.
The basic sequence involved in drag-and-drop is:
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 want 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. This issue has been dealt with in Mac OS X with the introduction of Exposé.
In Mac OS , the user can install software without using the setup, the user can drag the contents of the disk and drag it to another drive to initialize the installation.
Another feature was dragging text or picture to any where were you can bypass the clipboard introduced in System 7.5.
The dragging of window contents was introduced in Mac OS X.
Mac OS X allows users who are dragging window contents, to return to it's position when the mouse is released.
Subsequently numerous other competitors provided drag & drop desktop replacements to the standard Windows interface including the Norton Desktop, Xerox, NewWave, and Central Point. In Windows 95, Microsoft prevented developers from taking over the desktop and released a drag & drop model of their own.
Further examples include:
Company sheds light on UD testing irregularities ; Using 'drag-and-drop' in a computerized test and the resulting grades are at the center of the dispute.
Dec 30, 2007; DAYTON -- At least one University of Dayton law school student found a way to copy material from his computer files into an...