3. Drag & Drop Flags

Many of the drag and drop messages contain a flag bitfield, which is called the ``DnD Flags'' throughout this documentation. The ``DnD Flags'' consist of four distinct bitfields - each of it is four bits wide and is labeled 1 through 4 in figure .

Not every message makes use of every of the four bitfields. Some drag and drop messages don't use the ``DnD Flags'' at all, although they contain a spare field with the same size and in the same position as the ``DnD Flags''. Below, the descriptions of the various drag and drop messages will refer to this bitfields 1 through 4. Thus, you can easily tell, which bitfields are used for a particular message.

Figure: The ``DnD Flags'' signal various status conditions during a drag and drop operation.

Their purpose is as follows:

Table: Operation codes.

Identifier	Value
XmDROP_NOOP	0x00
XmDROP_MOVE	0x01
XmDROP_COPY	0x02
XmDROP_LINK	0x04

Table: Completion status codes.

Identifier	Value
XmDROP	0x00
XmDROP_HELP	0x01
XmDROP_CANCEL	0x02
XmDROP_INTERRUPT	0x03

Table: Drop site status codes.

Identifier	Value
XmNO_DROP_SITE	0x01
XmDROP_SITE_INVALID	0x02
XmDROP_SITE_VALID	0x03
XmINVALID_DROP_SITE (DEPRECATED SYMBOL)	0x02
XmVALID_DROP_SITE (DEPRECATED SYMBOL)	0x03