|Tk_GetJustifyFromObj(3tk)||Tk Library Procedures||Tk_GetJustifyFromObj(3tk)|
NAME¶Tk_GetJustifyFromObj, Tk_GetJustify, Tk_NameOfJustify - translate between strings and justification styles
#include <tk.h> int Tk_GetJustifyFromObj(interp, objPtr, justifyPtr) int Tk_GetJustify(interp, string, justifyPtr) const char * Tk_NameOfJustify(justify)
- 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