GetAnchor3tk

Usage

#include <tk.h>

int
Tk_GetAnchorFromObj(interp, objPtr, anchorPtr)

int
Tk_GetAnchor(interp, string, anchorPtr)

char *
Tk_NameOfAnchor(anchor)

Arguments

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.

char *string (in)

Same as objPtr except description of anchor point is passed as a string.

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.

Overview

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, or TK_ANCHOR_CENTER. 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.

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_GetAnchorFromObj.

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.

Keywords

anchor position