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XmDropTransfer - The DropTransfer widget class
DropTransfer provides a set of resources that identifies the procedures and
associated information required by the toolkit in order to process and
complete a drop transaction. Clients should not explicitly create a
DropTransfer widget. Instead, a client initiates a transfer by calling
XmDropTransferStart, which initializes and returns a DropTransfer widget.
If this function is called within an XmNdropProc callback, the actual
transfers are initiated after the callback returns. Even if no data needs
to be transferred, XmDropTransferStart needs to be called (typically with
no arguments, or just setting XmNtransferStatus) to finish the drag and
The XmNdropTransfers resource specifies a transfer list that describes the
requested target types for the source data. A transfer list is an array of
XmDropTransferEntryRec structures, each of which identifies a target type.
The transfer list is analogous to the MULTIPLE selections capability
defined in the Inter-Client Communication Conventions Manual (ICCCM).
The DropTransfer resource, XmNtransferProc, specifies a transfer procedure
of type XtSelectionCallbackProc that delivers the requested selection data.
This procedure operates in conjunction with the underlying Xt selection
capabilities and is called for each target in the transfer list.
Additional target types can be requested after a transfer is initiated by
calling the XmDropTransferAdd function.
An XmDropTransferEntry is a pointer to the following structure of type
XmDropTransferEntryRec, which identifies a selection target associated with
a given drop transaction:
} XmDropTransferEntryRec, *XmDropTransferEntry;
Specifies any additional information required by this selection target
Specifies a selection target associated with the drop operation
DropTransfer inherits behavior and a resource from Object.
The class pointer is xmDropTransferObjectClass.
The class name is XmDropTransfer.
The following table defines a set of widget resources used by the
programmer to specify data. The programmer can also set the resource
values for the inherited classes to set attributes for this widget. To
reference a resource by name or by class in a .Xdefaults file, remove the
XmN or XmC prefix and use the remaining letters. To specify one of the
defined values for a resource in a .Xdefaults file, remove the Xm prefix
and use the remaining letters (in either lowercase or uppercase, but
include any underscores between words). The codes in the access column
indicate if the given resource can be set at creation time (C), set by
using XtSetValues (S), retrieved by using XtGetValues (G), or is not
XmDropTransfer Resource Set
Type: XmDropTransferEntryRec *
Type: unsigned char
Specifies the address of an array of drop transfer entry records. The
drop transfer is complete when all the entries in the list have been
Specifies a Boolean value that indicates whether the transfer on the
receiver side uses the Xt incremental selection transfer mechanism
described in X Toolkit Intrinsics--C Language Interface. If the value
is True, the receiver uses incremental transfer; if the value is False,
the receiver uses atomic transfer.
Specifies the number of entries in XmNdropTransfers. If this resource
is set to 0 at any time, the transfer is considered complete. The
value of XmNtransferStatus determines the completion handshaking
Specifies a procedure of type XtSelectionCallbackProc that delivers the
requested selection values. The widget argument passed to this
procedure is the DropTransfer widget. The selection atom passed is
_MOTIF_DROP. For additional information on selection callback
procedures, see X Toolkit Intrinsics--C Language Interface.
Specifies the current status of the drop transfer. The client updates
this value when the transfer ends and communicates the value to the
initiator. The possible values are:
The transfer succeeded.
The transfer failed.
DropTransfer inherits behavior and a resource from Object. For a complete
description of this resource, refer to the Object reference page.
Object Resource Set
Object(3X), XmDisplay(3X), XmDragContext(3X), XmDragIcon(3X),
XmDropSite(3X), XmDropTransferAdd(3X), XmDropTransferStart(3X)
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