Tk_GetAnchorFromObj, Tk_GetAnchor, Tk_NameOfAnchor - translate between strings and anchor positions
Tk_GetAnchorFromObj(interp, objPtr, anchorPtr)
Tk_GetAnchor(interp, string, anchorPtr)
CONST char *
Tk_GetAnchorFromObj places in *anchorPtr an anchor position
(enumerated type Tk_Anchor)
corresponding to objPtr's value. The result will be one of
TK_ANCHOR_N, TK_ANCHOR_NE, TK_ANCHOR_E, TK_ANCHOR_SE,
TK_ANCHOR_S, TK_ANCHOR_SW, TK_ANCHOR_W, TK_ANCHOR_NW,
Anchor positions are typically used for indicating a point on an object
that will be used to position the object, e.g. TK_ANCHOR_N means
position the top center point of the object at a particular place.
- Tcl_Interp *interp (in)
Interpreter to use for error reporting, or NULL.
- Tcl_Obj *objPtr (in/out)
String value contains name of anchor point: n, ne,
e, se, s, sw, w, nw, or center;
internal rep will be modified to cache corresponding Tk_Anchor.
- CONST char *string (in)
Same as objPtr except description of anchor point is passed as
- int *anchorPtr (out)
Pointer to location in which to store anchor position corresponding to
objPtr or string.
- Tk_Anchor anchor (in)
Anchor position, e.g. TCL_ANCHOR_CENTER.
Under normal circumstances the return value is TCL_OK and
interp is unused.
If string doesn't contain a valid anchor position
or an abbreviation of one of these names, TCL_ERROR is returned,
*anchorPtr is unmodified, and an error message is
stored in interp's result if interp isn't NULL.
Tk_GetAnchorFromObj caches information about the return
value in objPtr, which speeds up future calls to
Tk_GetAnchorFromObj with the same objPtr.
Tk_GetAnchor is identical to Tk_GetAnchorFromObj except
that the description of the anchor is specified with a string instead
of an object. This prevents Tk_GetAnchor from caching the
return value, so Tk_GetAnchor is less efficient than
Tk_NameOfAnchor is the logical inverse of Tk_GetAnchor.
Given an anchor position such as TK_ANCHOR_N it returns a
statically-allocated string corresponding to anchor.
If anchor isn't a legal anchor value, then
``unknown anchor position'' is returned.
Copyright © 1990 The Regents of the University of California.
Copyright © 1994-1998 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.