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XmDropTransfer(3X) XmDropTransfer(3X) NAME XmDropTransfer - The DropTransfer widget class SYNOPSIS #include <Xm/DragDrop.h> DESCRIPTION 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 wid- get. 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 drop transaction. 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 proce- dure of type XtSelectionCallbackProc that delivers the requested selec- tion 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. Structures An XmDropTransferEntry is a pointer to the following structure of type XmDropTransferEntryRec, which identifies a selection target associated with a given drop transaction: typedef struct { XtPointer client_data; Atom target; } XmDropTransferEntryRec, *XmDropTransferEntry; Specifies any additional information required by this selection target Specifies a selection target associated with the drop operation Classes DropTransfer inherits behavior and a resource from Object. The class pointer is xmDropTransferObjectClass. The class name is XmDropTransfer. New Resources The following table defines a set of widget resources used by the pro- grammer to specify data. The programmer can also set the resource val- ues 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 applicable (N/A). XmDropTransfer Resource Set Class: XmCDropTransfers Default: NULL Type: XmDropTransferEntryRec * Access: CG Class: XmCIncremental Default: False Type: Boolean Access: CSG Class: XmCNumDropTransfers Default: 0 Type: Cardinal Access: CSG Class: XmCTransferProc Default: NULL Type: XtSelectionCallbackProc Ac- cess: CSG Class: XmCTransferStatus Default: XmTRANSFER_SUCCESS Type: unsigned char Access: CSG 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 processed. 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 re- ceiver uses incremental transfer; if the value is False, the re- ceiver 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 process. Specifies a pro- cedure of type XtSelectionCallbackProc that delivers the re- quested 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. Inherited Resources DropTransfer inherits behavior and a resource from Object. For a com- plete description of this resource, refer to the Object reference page. Object Resource Set Class: XmCCallback Default: NULL Type: XtCallbackList Access: C SEE ALSO Object(3X), XmDisplay(3X), XmDragContext(3X), XmDragIcon(3X), XmDrop- Site(3X), XmDropTransferAdd(3X), XmDropTransferStart(3X) XmDropTransfer(3X)