XmeDragSource(3X) UNIX System V XmeDragSource(3X)
NAME
XmeDragSource - A toolkit function that starts a drag and
drop operation
SYNOPSIS
#include <Xm/TransferP.h>
Widget XmeDragSource(
Widget widget,
XtPointer location_data,
XEvent *event,
ArgList args,
Cardinal arg_count);
VERSION
This page documents Motif 2.1.
DESCRIPTION
XmeDragSource begins a drag and drop operation from the
specified widget.
This routine first asks the widget to convert the
_MOTIF_DROPselection to _MOTIF_EXPORT_TARGETS. The returned
list of targets becomes the initial value of the
DragContext's XmNexportTargets, and the number of targets
becomes the initial value of the DragContext's
XmNnumExportTargets.
The location_data argument contains information about the
location of the elements being dragged. If these consist of
the widget's current selection, the value is NULL.
Otherwise, the type and interpretation of the value are
specific to the widget class. The location_data argument
becomes the value of the DragContext's XmNclientData and of
the location_data member of the XmConvertCallbackStruct for
subsequent conversions of the data being dragged.
XmeDragSource sets the DragContext's XmNconvertProc to a
function that asks the widget to convert data.
This routine calls XmDragStart with the widget specified in
widget, the event specified in event, and the arguments
specified in args. It overrides any settings of
XmNexportTargets, XmNnumExportTargets, XmNconvertProc, and
XmNclientDatain args.
Whenever this routine or a subsequent drop operation asks a
widget to convert data, it makes the following sequence of
calls:
1. Calls the application's XmNconvertCallback procedures,
if any.
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XmeDragSource(3X) UNIX System V XmeDragSource(3X)
2. Calls the source widget's convertProc trait method.
However, if any XmNconvertCallback procedure returns
XmCONVERT_DONE or XmCONVERT_REFUSE, then
XmePrimarySource will not call convertProc.
widget Specifies the widget that is the source for the
data.
location_data
Specifies the location of the elements being
dragged. If these consist of the widget's current
selection, the value is NULL. Otherwise, the type
and interpretation of the value are specific to
the widget class.
event Specifies the event that began the drag operation.
args Specifies arguments to be passed to XmDragStart.
arg_count Specifies the number of arguments in args.
RETURN
This function returns the widget ID of the XmDragContext
returned by XmDragStart.
RELATED
XmDragStart(3), XmQTtransfer(3), XmTransferDone(3),
XmTransferValue(3), XmeClipboardSink(3),
XmeClipboardSource(3), XmeConvertMerge(3), XmeDropSink(3),
XmeGetEncodingAtom(3), XmePrimarySink(3),
XmePrimarySource(3), XmeSecondarySink(3),
XmeSecondarySource(3), XmeSecondaryTransfer(3),
XmeStandardConvert(3), XmeStandardTargets(3), and
XmeTransferAddDoneProc(3).
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