Tk_GetScrollInfo
NAMESYNOPSIS
ARGUMENTS
DESCRIPTION
KEYWORDS
___________________________
NAME
Tk_GetScrollInfo, Tk_GetScrollInfoObj − parse arguments for scrolling commands
SYNOPSIS
#include <tk.h>
int
Tk_GetScrollInfo(interp, argc, argv, dblPtr,
intPtr)
int
Tk_GetScrollInfoObj(interp, objc, objv, dblPtr,
intPtr)
ARGUMENTS
|
Tcl_Interp *interp (in) |
Interpreter to use for error reporting. | ||
|
int argc (in) |
Number of strings in argv array. | ||
|
const char *argv[] (in) |
Argument strings. These represent the entire widget command, of which the first word is typically the widget name and the second word is typically xview or yview. | ||
|
int objc (in) |
Number of Tcl_Obj’s in objv array. | ||
|
Tcl_Obj *const objv[] (in) |
Argument objects. These represent the entire widget command, of which the first word is typically the widget name and the second word is typically xview or yview. | ||
|
double *dblPtr (out) |
Filled in with fraction from moveto option, if any. | ||
|
int *intPtr (out) |
Filled in with line or page count from scroll option, if any. The value may be negative. |
______________
DESCRIPTION
Tk_GetScrollInfo parses the arguments expected by widget scrolling commands such as xview and yview. It receives the entire list of words that make up a widget command and parses the words starting with argv[2]. The words starting with argv[2] must have one of the following forms:
moveto fraction
scroll number units
scroll number pages
Any of the moveto, scroll, units, and pages keywords may be abbreviated. If argv has the moveto form, TK_SCROLL_MOVETO is returned as result and *dblPtr is filled in with the fraction argument to the command, which must be a proper real value. If argv has the scroll form, TK_SCROLL_UNITS or TK_SCROLL_PAGES is returned and *intPtr is filled in with the number value, which must be a proper integer. If an error occurs in parsing the arguments, TK_SCROLL_ERROR is returned and an error message is left in interp->result.
Tk_GetScrollInfoObj is identical in function to Tk_GetScrollInfo. However, Tk_GetScrollInfoObj accepts Tcl_Obj style arguments, making it more appropriate for use with new development.
KEYWORDS
parse, scrollbar, scrolling command, xview, yview
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