XmDropSite(3X) XmDropSite(3X)
NAME
XmDropSite - The DropSite Registry
SYNOPSIS
#include <Xm/DragDrop.h>
DESCRIPTION
A client registers a widget or gadget as a drop site using the XmDropSiteRegister function. In addition, this routine defines the behavior
and capabilities of a drop site by specifying appropriate resources. For example, the XmNimportTargets and XmNnumImportTargets resources
identify respectively the selection target types and number of types supported by a drop site. The visual animation effects associated
with a drop site are also described with DropSite resources.
Drop site animation effects that occur in response to the pointer entering a valid drop site are called drag-under effects. A receiver can
select from several animation styles supplied by the toolkit or can provide customized animation effects. Drag-under effects supplied by
the toolkit include border highlighting, shadow in/out drawing, and pixmap representation.
When a preregister drag protocol style is used, the toolkit generates drag-under visual effects based on the value of the XmNanimationStyle
resource. In dynamic mode, if the drop site XmNdragProc resource is NULL, the toolkit also provides animation effects based on the XmNani-
mationStyle resource. Otherwise, if the XmNdragProc routine is specified, the receiver can either assume responsibility for animation
effects (through the XmNdragProc routine) or rely on the toolkit to provide animation.
Drop sites may overlap. The initial stacking order corresponds to the order in which the drop sites were registered. When a drop site
overlaps another drop site, the drag-under effects of the drop site underneath are clipped by the obscuring drop site(s).
The XmDropSiteUpdate routine sets resources for a widget that is registered as a drop site. XmDropSiteRetrieve gets drop site resource
values previously specified for a registered widget. These routines are used instead of XtSetValues and XtGetValues.
Classes
XmDropSite does not inherit from any widget class.
New Resources
The following table defines a set of widget resources used by the programmer to specify data. 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 XmDropSiteUpdate (S),
retrieved by using XmDropSiteRetrieve (G), or is not applicable (N/A).
XmDropSite Resource Set
Class: XmCAnimationMask Default: XmUNSPECIFIED_PIXMAP Type: Pixmap Access: CSG Class: XmCAnimationPixmap Default: XmUNSPECIFIED_PIXMAP
Type: Pixmap Access: CSG Class: XmCAnimationPixmapDepth Default: 0 Type: int Access: CSG Class: XmCAnimationStyle Default:
XmDRAG_UNDER_HIGHLIGHT Type: unsigned char Access: CSG Class: XmCDragProc Default: NULL Type: XtCallbackProc Access: CSG Class: XmCDrop-
Proc Default: NULL Type: XtCallbackProc Access: CSG Class: XmCDropRectangles Default: dynamic Type: XRectangle * Access: CSG Class: XmC-
DropSiteActivity Default: XmDROP_SITE_ACTIVE Type: unsigned char Access: CSG Class: XmCDropSiteOperations Default: XmDROP_MOVE
XmDROP_COPY Type: unsigned char Access: CSG Class: XmCDropSiteType Default: XmDROP_SITE_SIMPLE Type: unsigned char Access: CG Class:
XmCImportTargets Default: NULL Type: Atom * Access: CSG Class: XmCNumDropRectangles Default: 1 Type: Cardinal Access: CSG Class: XmCNu-
mImportTargets Default: 0 Type: Cardinal Access: CSG
Specifies a mask to use with the pixmap specified by XmNanimationPixmap when the animation style is XmDRAG_UNDER_PIXMAP. Specifies
a pixmap for drag-under animation when the animation style is XmDRAG_UNDER_PIXMAP. The pixmap is drawn with its origin at the upper
left corner of the bounding box of the drop site. If the drop site window is larger than the animation pixmap, the portion of the
window not covered by the pixmap will be tiled with the window's background color. Specifies the depth of the pixmap specified by
the XmNanimationPixmap resource. When the depth is 1, the colors are taken from the foreground and background of the drop site wid-
get. For any other value, drop site animation occurs only if the XmNanimationPixmapDepth matches the depth of the drop site window.
Colors are derived from the current colormap. Specifies the drag-under animation style used when a drag enters a valid drop site.
The possible values are: The drop site uses highlighting effects. The drop site uses an outset shadow. The drop site uses an inset
shadow. The drop site uses the pixmap specified by XmNanimationPixmap to indicate that it can receive the drop. The drop site does
not use animation effects. A client using a dynamic protocol, may provide drag-under effects in its XmNdragProc routine. Specifies
the procedure that is invoked when the drop site receives a crossing, motion, or operation changed message. This procedure is
called only when a dynamic protocol is used. The type of structure whose address is passed to this procedure is XmDragProcCallback-
Struct. The reason sent to the procedure is one of the following:
XmCR_DROP_SITE_ENTER_MESSAGE XmCR_DROP_SITE_LEAVE_MESSAGE XmCR_DRAG_MOTION_MESSAGE XmCR_OPERATION_CHANGED_MESSAGE
The drag procedure may change the values of some members of the XmDragProcCallbackStruct passed to it. After the drag procedure
returns, the toolkit uses the final values in initializing some members of the callback struct passed to the appropriate callbacks
of the initiator (the DragContext's XmNdropSiteEnterCallback, XmNdropSiteLeaveCallback, XmNdragMotionCallback, or XmNopera-
tionChangedCallback callbacks). Specifies the procedure that is invoked when a drop (excluding a cancel or interrupt action) occurs
on a drop site regardless of the status of the drop site. The type of the structure whose address is passed to this procedure is
XmDropProcCallbackStruct. The reason sent to the procedure is XmCR_DROP_MESSAGE.
The drop procedure may change the values of some members of the XmDropProcCallbackStruct passed to it. After the drop procedure
returns, the toolkit uses the final values in initializing some members of the XmDropStartCallbackStruct passed to the initiator's
drop start callbacks (the DragContext's XmNdropStartCallback callbacks). Specifies a list of rectangles that describe the shape of
a drop site. The locations of the rectangles are relative to the origin of the enclosing object. When XmNdropRectangles is NULL,
the drop site is assumed to be the sensitive area of the enclosing widget. If XmNdropSiteType is XmDROP_SITE_COMPOSITE, this
resource cannot be specified by the application. Indicates whether a drop site is active or inactive. The values are
XmDROP_SITE_ACTIVE and XmDROP_SITE_INACTIVE. An active drop site can receive a drop, whereas an inactive drop site is dormant. An
inactive drop site is treated as if it was not a registered drop site and any drag-under visuals associated with entering or leaving
the drop site do not occur. However, it is still used for clipping drag-under effects. Specifies the set of valid operations asso-
ciated with a drop site. This resource is a bit mask that is formed by combining one or more of the following values using a bitwise
operation such as inclusive OR (|): XmDROP_COPY, XmDROP_LINK, and XmDROP_MOVE. The value XmDROP_NOOP for this resource indicates
that no operations are valid. Specifies the type of the drop site. The possible values are: The widget does not have any additional
children that are registered as drop sites. The widget will have children that are registered as drop sites. Specifies the list of
target atoms that this drop site accepts. Specifies the number of rectangles in the XmNdropRectangles list. If the drop site type
is XmDROP_SITE_COMPOSITE, this resource can not be specified by the application. Specifies the number of atoms in the target atom
list.
Callback Information
A pointer to the following structure is passed to the XmNdragProc routine when the drop site receives crossing, motion, or operation
changed messages. typedef struct {
int reason;
XEvent *event;
Time timeStamp;
Widget dragContext;
Position x;
Position y;
unsigned char dropSiteStatus;
unsigned char operation;
unsigned char operations;
Boolean animate; }XmDragProcCallbackStruct, *XmDragProcCallback;
Indicates why the callback was invoked. Points to the XEvent that triggered the callback. Specifies the timestamp of the logical event.
Specifies the ID of the DragContext widget associated with the transaction. Indicates the x-coordinate of the pointer relative to the drop
site. Indicates the y-coordinate of the pointer relative to the drop site. An IN/OUT member that indicates whether or not a drop site is
valid.
When the reason is XmCR_DROP_SITE_ENTER_MESSAGE or XmCR_OPERATION_CHANGED_MESSAGE, or when the reason is XmCR_DRAG_MOTION_MESSAGE or
XmCR_DROP_SITE_LEAVE_MESSAGE and the pointer is not in the same drop site as on the previous invocation of the drag procedure, the
toolkit initializes dropSiteStatus as follows: the toolkit initializes dropSiteStatus to XmDROP_SITE_VALID if the DragContext's XmN-
exportTargets and the DropSite's XmNimportTargets are compatible and if the initial value of the operation member is not
XmDROP_NOOP. Otherwise, the toolkit initializes dropSiteStatus to XmDROP_SITE_INVALID.
When the reason is XmCR_DRAG_MOTION_MESSAGE or XmCR_DROP_SITE_LEAVE_MESSAGE and the pointer is within the same drop site as on the
previous invocation of the drag procedure, the toolkit initializes dropSiteStatus to the value of dropSiteStatus at the time the
previous invocation of the drag procedure returns.
The drag procedure may change the value of this member. After the drag procedure returns, the toolkit uses the final value in ini-
tializing the dropSiteStatus member of the callback struct passed to the appropriate callbacks of the initiator. An IN/OUT member
that identifies an operation.
The toolkit initializes operation by selecting an operation from the bitwise AND of the initial value of the operations member and
the value of the DropSite's XmNdropSiteOperations resource. The toolkit searches this set first for XmDROP_MOVE, then for
XmDROP_COPY, then for XmDROP_LINK, and initializes operation to the first operation it finds in the set. If the toolkit finds none
of these operations in the set, it initializes operation to XmDROP_NOOP.
The drag procedure may change the value of this member. After the drag procedure returns, the toolkit uses the final value in ini-
tializing the operation member of the callback struct passed to the appropriate callbacks of the initiator. An IN/OUT member that
indicates the set of operations supported for the source data.
If the user does not select an operation (by pressing a modifier key), the toolkit initializes operations to the value of the Drag-
Context's XmNdragOperations resource. If the user does select an operation, the toolkit initializes operations to the bitwise AND of
the corresponding operation and the value of the DragContext's XmNdragOperations resource. If the resulting set of operations is
empty, the toolkit initializes operations to XmDROP_NOOP.
The drag procedure may change the value of this member. After the drag procedure returns, the toolkit uses the final value in ini-
tializing the operations member of the callback struct passed to the appropriate callbacks of the initiator. An OUT member that
indicates whether the toolkit or the receiver client provides drag-under effects for a valid drop site. If animate is set to True,
the toolkit provides drop site animation per the XmNanimationStyle resource value; if it is set to False, the receiver generates
drag-under animation effects.
A pointer to the following structure is passed to the XmNdropProc routine when the drop site receives a drop message: typedef struct {
int reason;
XEvent *event;
Time timeStamp;
Widget dragContext;
Position x;
Position y;
unsigned char dropSiteStatus;
unsigned char operation;
unsigned char operations;
unsigned char dropAction; }XmDropProcCallbackStruct, *XmDropProcCallback;
Indicates why the callback was invoked. Specifies the XEvent that triggered the callback. Specifies the timestamp of the logical event.
Specifies the ID of the DragContext widget associated with the transaction. Indicates the x-coordinate of the pointer relative to the drop
site. Indicates the y-coordinate of the pointer relative to the drop site. An IN/OUT member that indicates whether or not a drop site is
valid.
The toolkit initializes dropSiteStatus to XmDROP_SITE_VALID if the DragContext's XmNexportTargets and the DropSite's XmNimportTar-
gets are compatible and if the initial value of the operation member is not XmDROP_NOOP. Otherwise, the toolkit initializes drop-
SiteStatus to XmDROP_SITE_INVALID.
The drop procedure may change the value of this member. After the drop procedure returns, the toolkit uses the final value in ini-
tializing the dropSiteStatus member of the XmDropStartCallbackStruct passed to the initiator's drop start callbacks (the DragCon-
text's XmNdropStartCallback callbacks). An IN/OUT member that identifies an operation.
The toolkit initializes operation by selecting an operation from the bitwise AND of the initial value of the operations member and
the value of the DropSite's XmNdropSiteOperations resource. The toolkit searches this set first for XmDROP_MOVE, then for
XmDROP_COPY, then for XmDROP_LINK, and initializes operation to the first operation it finds in the set. If it finds none of these
operations in the set, it initializes operation to XmDROP_NOOP.
The drop procedure may change the value of this member. After the drop procedure returns, the toolkit uses the final value in ini-
tializing the operation member of the XmDropStartCallbackStruct passed to the initiator's drop start callbacks (the DragContext's
XmNdropStartCallback callbacks). An IN/OUT member that indicates the set of operations supported for the source data.
If the user does not select an operation (by pressing a modifier key), the toolkit initializes operations to the value of the Drag-
Context's XmNdragOperations resource. If the user does select an operation, the toolkit initializes operations to the bitwise AND of
the corresponding operation and the value of the DragContext's XmNdragOperations resource. If the resulting set of operations is
empty, the toolkit initializes operations to XmDROP_NOOP.
The drop procedure may change the value of this member. After the drop procedure returns, the toolkit uses the final value in ini-
tializing the operations member of the XmDropStartCallbackStruct passed to the initiator's drop start callbacks (the DragContext's
XmNdropStartCallback callbacks). An IN/OUT member that identifies the action associated with the drop. The possible values are: A
drop was attempted. If the drop site is valid, drop transfer handling proceeds. The user has requested help on the drop site.
The drop procedure may change the value of this member. After the drop procedure returns, the toolkit uses the final value in initializing
the dropAction member of the XmDropStartCallbackStruct passed to the initiator's drop start callbacks (the DragContext's XmNdropStartCall-
back callbacks).
SEE ALSO
XmDragContext(3X), XmDragIcon(3X), XmDropSiteConfigureStackingOrder(3X), XmDropSiteEndUpdate(3X), XmDropSiteQueryStackingOrder(3X), XmDrop-
SiteRegister(3X), XmDropSiteStartUpdate(3X), XmDropSiteUpdate(3X), XmDropSiteUnregister(3X), XmDropTransfer(3X), XmTargetsAreCompatible(3X)
XmDropSite(3X)