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NAME
     DtDnd.h - Drag and drop definitions

SYNOPSIS
     #include <Dt/Dnd.h>

DESCRIPTION
     The <Dt/Dnd.h>  header  defines  the  following  enumeration
     types:

          DtCR_DND_CONVERT_DATA
          DtCR_DND_CONVERT_DELETE
          DtCR_DND_DRAG_FINISH
          DtCR_DND_TRANSFER_DATA
          DtCR_DND_DROP_ANIMATE

     The header defines the  following  enumeration  data  types,
     with at least the following members:

        DtDndStatus
              DtDND_SUCCESS, DtDND_FAILURE

        DtDndProtocol

                   DtDND_TEXT_TRANSFER     = (1L << 0)
                   DtDND_FILENAME_TRANSFER = (1L << 1)
                   DtDND_BUFFER_TRANSFER   = (1L << 2)

     The header declares the following structures:

          typedef struct _DtDndBuffer {
              void *bp;
              int size;
              string name;
          } DtDndBuffer;

          typedef struct _DtDndContext {
              DtDndProtocol protocol;
              int numItems;
              union {
                  XmString *strings;
                  String *files;
                  DtDndBuffer *buffers;
              } data;
          } DtDndContext;

          typedef struct _DtDndConvertCallbackStruct {
              int reason;
              XEvent *event;
              DtDndContext *dragData;
              DtDndStatus status;
          } DtDndConvertCallbackStruct, *DtDndConvertCallback;
          typedef struct _DtDndDragFinishCallbackStruct {
              int reason;
              XEvent *event;
              DtDndContext *dragData;
              Widget sourceIcon;
          } DtDndDragFinishCallbackStruct, *DtDndDragFinishCallback;

          typedef struct _DtDndTransferCallbackStruct {
              int reason;
              XEvent *event;
              Position x, y;
              unsigned char operation;
              DtDndContext *dropData;
              Boolean completeMove;
              DtDndStatus status;
          } DtDndTransferCallbackStruct, *DtDndTransferCallback;

          typedef struct _DtDndDropAnimateCallbackStruct {
              int reason;
              XEvent *event;
              Position x, y;
              unsigned char operation;
              DtDndContext *dropData;
          } DtDndDropAnimateCallbackStruct, *DtDndDropAnimateCallback;

     The header declares the following as functions:

     Widget DtDndCreateSourceIcon(Widget parent,
                                  Pixmap pixmap,
                                  Pixmap mask);

     Widget DtDndDragStart(Widget dragSource,
                           XEvent *event,
                           DtDndProtocol protocol,
                           Cardinal numItems,
                           unsigned char operations,
                           XtCallbackList convertCallback,
                           XtCallbackList dragFinishCallback,
                           ArgList argList,
                           Cardinal argCount);

     Widget DtDndVaDragStart(Widget dragSource,
                             XEvent *event,
                             DtDndProtocol protocol,
                             Cardinal numItems,
                             unsigned char operations,
                             XtCallbackList convertCallback,
                             XtCallbackList dragFinishCallback,
                             ...);

     void DtDndDropRegister(Widget dropSite,
                            DtDndProtocol protocols,
                            unsigned char operations,
                            XtCallbackList transferCallback,
                            ArgList argList,
                            Cardinal argCount);

     void DtDndVaDropRegister(Widget dropSite,
                              DtDndProtocol protocols,
                              unsigned char operations,
                              XtCallbackList transferCallback,
                              ...);

     void DtDndDropUnregister(Widget dropSite);

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