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  4. Tk_GetJustifyFromObj(3)

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Tk_GetJustifyFromObj(3) Tk Library Procedures Tk_GetJustifyFromObj(3) 





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:



  

  
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.

  

  
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.

  

  
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







  

    8.1
    Tk