Tk_GetJustifyFromObj manual page - Tk Library Procedures

## Tcl/Tk Documentation > Tk C API, version 8.6.18 > GetJustify

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  NAME
    Tk_GetJustifyFromObj, Tk_GetJustify, Tk_NameOfJustify — translate between strings and justification styles
  SYNOPSIS
    #include <tk.h>
    int
    Tk_GetJustifyFromObj(interp, objPtr, justifyPtr)
    int
    Tk_GetJustify(interp, string, justifyPtr)
    const char *
    Tk_NameOfJustify(justify)
  ARGUMENTS
  DESCRIPTION
    TK_JUSTIFY_LEFT
    TK_JUSTIFY_RIGHT
    TK_JUSTIFY_CENTER
  KEYWORDS

### NAME

Tk_GetJustifyFromObj, Tk_GetJustify, Tk_NameOfJustify — translate between strings and justification styles

### SYNOPSIS

#include <tk.h>
int
Tk_GetJustifyFromObj(interp, objPtr, justifyPtr)
int
Tk_GetJustify(interp, string, justifyPtr)
const char *
Tk_NameOfJustify(justify)

### ARGUMENTS

Tcl_Interp *interp (in)
  Interpreter to use for error reporting, or NULL.

Tcl_Obj *objPtr (in/out)
  String value contains name of justification style - one of “left”, “right”, or “center” - or a unique abbreviation of one. The internal rep will be modified to cache corresponding justify value.

const char *string (in)
  Same as objPtr except description of justification style is passed as a string.

int *justifyPtr (out)
  Pointer to location in which to store justify value corresponding to objPtr or string.

Tk_Justify justify (in)
  Justification style (one of the values listed below).

### DESCRIPTION

Tk_GetJustifyFromObj places in *justifyPtr the justify value corresponding to objPtr's value. This value will be one of the following:

TK_JUSTIFY_LEFT
  Means that the text on each line should start at the left edge of the line; as a result, the right edges of lines may be ragged.

TK_JUSTIFY_RIGHT
  Means that the text on each line should end at the right edge of the line; as a result, the left edges of lines may be ragged.

TK_JUSTIFY_CENTER
  Means that the text on each line should be centered; as a result, both the left and right edges of lines may be ragged.

Under normal circumstances the return value is TCL_OK and interp is unused. If objPtr does not contain a valid justification style or an abbreviation of one of these names, TCL_ERROR is returned, *justifyPtr is unmodified, and an error message is stored in interp's result if interp is not NULL. Tk_GetJustifyFromObj caches information about the return value in objPtr, which speeds up future calls to Tk_GetJustifyFromObj with the same objPtr.

Tk_GetJustify is identical to Tk_GetJustifyFromObj except that the description of the justification is specified with a string instead of an object. This prevents Tk_GetJustify from caching the return value, so Tk_GetJustify is less efficient than Tk_GetJustifyFromObj.

Tk_NameOfJustify is the logical inverse of Tk_GetJustify. Given a justify value it returns a statically-allocated string corresponding to justify. If justify is not a legal justify value, then “unknown justification style” is returned.

### KEYWORDS

center, fill, justification, string
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