QIconDrag Class Reference
[iconview module]

Detailed Description

The QIconDrag class supports drag and drop operations within a QIconView.

A QIconDrag object is used to maintain information about the positions of dragged items and the data associated with the dragged items. QIconViews are able to use this information to paint the dragged items in the correct positions. Internally QIconDrag stores the data associated with drag items in QIconDragItem objects.

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

The data in QIconDragItems 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 QIconDrag and reimplement format(), encodedData() and canDecode().

The fileiconview example program demonstrates the use of the QIconDrag class including subclassing and reimplementing dragObject(), format(), encodedData() and canDecode(). See the files qt/examples/fileiconview/qfileiconview.h and qt/examples/fileiconview/qfileiconview.cpp.

See also QMimeSource::format() and Drag And Drop Classes.

Member Function Documentation

QIconDrag::QIconDrag ( QWidget * dragSource, const char * name = 0 )

Note that the drag object will be deleted when dragSource is deleted.

QIconDrag::~QIconDrag () [virtual]

void QIconDrag::append ( const QIconDragItem & i, const QRect & pr, const QRect & tr )

See also QIconDragItem.

Example: fileiconview/qfileiconview.cpp.

bool QIconDrag::canDecode ( QMimeSource * e ) [static]

Example: fileiconview/qfileiconview.cpp.

QByteArray QIconDrag::encodedData ( const char * mime ) const [virtual]

Example: fileiconview/qfileiconview.cpp.

Reimplemented from QMimeSource.

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