Tk_GetAnchor — C Library Procedures

NAME

Tk_GetAnchor, Tk_NameOfAnchor − translate between strings and anchor positions

SYNOPSIS

#include <tk.h>
Tk_Anchor
Tk_GetAnchor(interp, string, anchorPtr)
char ∗
Tk_NameOfAnchor(anchor)

ARGUMENTS

Tcl_Interp∗interp(in) Interpreter to use for error reporting.

char∗string(in) String containing name of anchor point: one of “n”, “ne”, “e”, “se”, “s”, “sw”, “w”, “nw”, or “center”.

int∗anchorPtr(out) Pointer to location in which to store anchor position corresponding to string.

Tk_Anchoranchor(in) Anchor position, e.g. TCL_ANCHOR_CENTER.

DESCRIPTION

Tk_GetAnchor places in ∗anchorPtr an anchor position (enumerated type Tk_Anchor) corresponding to string, which 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 that 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, then an error message is stored in interp->result, TCL_ERROR is returned, and ∗anchorPtr is unmodified.

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