Q3IconDrag Class Reference
[Qt3Support module]

Detailed Description

The Q3IconDrag class supports drag and drop operations within a Q3IconView.

A Q3IconDrag object is used to maintain information about the positions of dragged items and the data associated with them. Q3IconViews are able to use this information to paint the dragged items in the correct positions. Internally, Q3IconDrag stores the data associated with drag items in Q3IconDragItem objects.

If you want to use the extended drag and drop functionality of Q3IconView, create a Q3IconDrag object in a reimplementation of Q3IconView::dragObject(). Then create a Q3IconDragItem for each item which should be dragged, set the data it represents with Q3IconDragItem::setData(), and add each Q3IconDragItem to the drag object using append().

The data in Q3IconDragItems is stored in a QByteArray and is mime-typed (see QMimeSource and the Drag and Drop overview). If you want to use your own mime-types derive a class from Q3IconDrag and reimplement format(), encodedData() and canDecode().

The fileiconview example program demonstrates the use of the Q3IconDrag class including subclassing and reimplementing dragObject(), format(), encodedData() and canDecode().

See also QMimeSource::format().

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