stk/Tk/generic/tkUtil.c

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/*
* tkUtil.c --
*
* This file contains miscellaneous utility procedures that
* are used by the rest of Tk, such as a procedure for drawing
* a focus highlight.
*
* Copyright (c) 1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkUtil.c 1.7 96/02/15 18:53:04
*/
#include "tk.h"
#include "tkPort.h"
/*
*----------------------------------------------------------------------
*
* Tk_DrawFocusHighlight --
*
* This procedure draws a rectangular ring around the outside of
* a widget to indicate that it has received the input focus.
*
* Results:
* None.
*
* Side effects:
* A rectangle "width" pixels wide is drawn in "drawable",
* corresponding to the outer area of "tkwin".
*
*----------------------------------------------------------------------
*/
void
Tk_DrawFocusHighlight(tkwin, gc, width, drawable)
Tk_Window tkwin; /* Window whose focus highlight ring is
* to be drawn. */
GC gc; /* Graphics context to use for drawing
* the highlight ring. */
int width; /* Width of the highlight ring, in pixels. */
Drawable drawable; /* Where to draw the ring (typically a
* pixmap for double buffering). */
{
XRectangle rects[4];
rects[0].x = 0;
rects[0].y = 0;
rects[0].width = Tk_Width(tkwin);
rects[0].height = width;
rects[1].x = 0;
rects[1].y = Tk_Height(tkwin) - width;
rects[1].width = Tk_Width(tkwin);
rects[1].height = width;
rects[2].x = 0;
rects[2].y = width;
rects[2].width = width;
rects[2].height = Tk_Height(tkwin) - 2*width;
rects[3].x = Tk_Width(tkwin) - width;
rects[3].y = width;
rects[3].width = width;
rects[3].height = rects[2].height;
XFillRectangles(Tk_Display(tkwin), drawable, gc, rects, 4);
}
/*
*----------------------------------------------------------------------
*
* Tk_GetScrollInfo --
*
* This procedure is invoked to parse "xview" and "yview"
* scrolling commands for widgets using the new scrolling
* command syntax ("moveto" or "scroll" options).
*
* Results:
* The return value is either TK_SCROLL_MOVETO, TK_SCROLL_PAGES,
* TK_SCROLL_UNITS, or TK_SCROLL_ERROR. This indicates whether
* the command was successfully parsed and what form the command
* took. If TK_SCROLL_MOVETO, *dblPtr is filled in with the
* desired position; if TK_SCROLL_PAGES or TK_SCROLL_UNITS,
* *intPtr is filled in with the number of lines to move (may be
* negative); if TK_SCROLL_ERROR, interp->result contains an
* error message.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tk_GetScrollInfo(interp, argc, argv, dblPtr, intPtr)
Tcl_Interp *interp; /* Used for error reporting. */
int argc; /* # arguments for command. */
char **argv; /* Arguments for command. */
double *dblPtr; /* Filled in with argument "moveto"
* option, if any. */
int *intPtr; /* Filled in with number of pages
* or lines to scroll, if any. */
{
int c;
size_t length;
length = strlen(argv[2]);
c = argv[2][0];
if ((c == 'm') && (strncmp(argv[2], "moveto", length) == 0)) {
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " ", argv[1], " moveto fraction\"",
(char *) NULL);
return TK_SCROLL_ERROR;
}
if (Tcl_GetDouble(interp, argv[3], dblPtr) != TCL_OK) {
return TK_SCROLL_ERROR;
}
return TK_SCROLL_MOVETO;
} else if ((c == 's')
&& (strncmp(argv[2], "scroll", length) == 0)) {
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " ", argv[1], " scroll number units|pages\"",
(char *) NULL);
return TK_SCROLL_ERROR;
}
if (Tcl_GetInt(interp, argv[3], intPtr) != TCL_OK) {
return TK_SCROLL_ERROR;
}
length = strlen(argv[4]);
c = argv[4][0];
if ((c == 'p') && (strncmp(argv[4], "pages", length) == 0)) {
return TK_SCROLL_PAGES;
} else if ((c == 'u')
&& (strncmp(argv[4], "units", length) == 0)) {
return TK_SCROLL_UNITS;
} else {
Tcl_AppendResult(interp, "bad argument \"", argv[4],
"\": must be units or pages", (char *) NULL);
return TK_SCROLL_ERROR;
}
}
Tcl_AppendResult(interp, "unknown option \"", argv[2],
"\": must be moveto or scroll", (char *) NULL);
return TK_SCROLL_ERROR;
}