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NAME
     DtWsmAddWorkspaceModifiedCallback - add  a  callback  to  be
     called when any workspace is changed

SYNOPSIS
     #include <Dt/Wsm.h>
     DtWsmCBContext
     DtWsmAddWorkspaceModifiedCallback(Widget widget,
                                       DtWsmWsModifiedProc ws_change,
                                       Pointer client_data);

DESCRIPTION
     The DtWsmAddWorkspaceModifiedCallback() function works  with
     the CDE workspace manager, dtwm(1), and registers a function
     to be called when a workspace is added, deleted or modified.

     The widget argument is a realized widget.

     The ws_change argument is the procedure to be called when  a
     workspace is modified.

     The client_data argument points to arbitrary client data  to
     be passed back to ws_change.

     The header defines the DtWsmWsModifiedProc  callback  proto-
     type as follows:

          typedef void (*DtWsmWsModifiedProc)(Widget widget,
                                              Atom aWorkspace,
                                              DtWsmWsReason reason,
                                              Pointer client_data);

     The widget argument is the ID of the widget to be registered
     with the callback.

     The aWorkspace argument is  the  name  of  the  new  current
     workspace (converted to an X atom).

     The reason argument is a type of modification:

        DtWSM_REASON_ADD
              A new workspace was added.

        DtWSM_REASON_BACKDROP
              The backdrop for the workspace changed.

        DtWSM_REASON_CURRENT
              A  different  workspace  was   made   the   current
              workspace.

        DtWSM_REASON_DELETE

              A workspace was deleted.

        DtWSM_REASON_TITLE
              The workspace title changed.

     The client_data argument points to the  client  data  to  be
     registered with the callback.

RETURN VALUE
     Upon successful completion,  the  DtWsmAddWorkspaceModified-
     Callback()  function  returns a workspace callback registra-
     tion context.

APPLICATION USAGE
     The DtWsmAddWorkspaceModifiedCallback() function  returns  a
     registration context that the application must save in order
     to remove this callback later.

     DtWsmAddWorkspaceModifiedCallback() requires a window; thus,
     a gadget is not acceptable for the widget argument.

     The DtWsmRemoveWorkspaceCallback(3) function needs a  regis-
     tration context to remove the callback.

SEE ALSO
     DtWsm(5), dtwm(1), DtWsmGetWorkspaceInfo(3),
     DtWsmGetWorkspaceList(3), DtWsmRemoveWorkspaceCallback(3).

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