230 lines
6.7 KiB
C
230 lines
6.7 KiB
C
/*
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* tkUtil.c --
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*
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* This file contains miscellaneous utility procedures that
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* are used by the rest of Tk, such as a procedure for drawing
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* a focus highlight.
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*
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* Copyright (c) 1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tkUtil.c 1.8 96/08/21 17:45:36
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*/
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#include "tkInt.h"
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#include "tkPort.h"
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/*
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*----------------------------------------------------------------------
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*
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* Tk_DrawFocusHighlight --
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*
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* This procedure draws a rectangular ring around the outside of
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* a widget to indicate that it has received the input focus.
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*
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* Results:
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* None.
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*
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* Side effects:
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* A rectangle "width" pixels wide is drawn in "drawable",
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* corresponding to the outer area of "tkwin".
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*
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*----------------------------------------------------------------------
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*/
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void
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Tk_DrawFocusHighlight(tkwin, gc, width, drawable)
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Tk_Window tkwin; /* Window whose focus highlight ring is
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* to be drawn. */
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GC gc; /* Graphics context to use for drawing
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* the highlight ring. */
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int width; /* Width of the highlight ring, in pixels. */
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Drawable drawable; /* Where to draw the ring (typically a
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* pixmap for double buffering). */
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{
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XRectangle rects[4];
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rects[0].x = 0;
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rects[0].y = 0;
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rects[0].width = Tk_Width(tkwin);
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rects[0].height = width;
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rects[1].x = 0;
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rects[1].y = Tk_Height(tkwin) - width;
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rects[1].width = Tk_Width(tkwin);
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rects[1].height = width;
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rects[2].x = 0;
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rects[2].y = width;
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rects[2].width = width;
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rects[2].height = Tk_Height(tkwin) - 2*width;
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rects[3].x = Tk_Width(tkwin) - width;
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rects[3].y = width;
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rects[3].width = width;
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rects[3].height = rects[2].height;
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XFillRectangles(Tk_Display(tkwin), drawable, gc, rects, 4);
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tk_GetScrollInfo --
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*
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* This procedure is invoked to parse "xview" and "yview"
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* scrolling commands for widgets using the new scrolling
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* command syntax ("moveto" or "scroll" options).
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*
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* Results:
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* The return value is either TK_SCROLL_MOVETO, TK_SCROLL_PAGES,
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* TK_SCROLL_UNITS, or TK_SCROLL_ERROR. This indicates whether
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* the command was successfully parsed and what form the command
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* took. If TK_SCROLL_MOVETO, *dblPtr is filled in with the
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* desired position; if TK_SCROLL_PAGES or TK_SCROLL_UNITS,
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* *intPtr is filled in with the number of lines to move (may be
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* negative); if TK_SCROLL_ERROR, interp->result contains an
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* error message.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tk_GetScrollInfo(interp, argc, argv, dblPtr, intPtr)
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Tcl_Interp *interp; /* Used for error reporting. */
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int argc; /* # arguments for command. */
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char **argv; /* Arguments for command. */
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double *dblPtr; /* Filled in with argument "moveto"
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* option, if any. */
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int *intPtr; /* Filled in with number of pages
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* or lines to scroll, if any. */
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{
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int c;
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size_t length;
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length = strlen(argv[2]);
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c = argv[2][0];
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if ((c == 'm') && (strncmp(argv[2], "moveto", length) == 0)) {
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if (argc != 4) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " ", argv[1], " moveto fraction\"",
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(char *) NULL);
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return TK_SCROLL_ERROR;
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}
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if (Tcl_GetDouble(interp, argv[3], dblPtr) != TCL_OK) {
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return TK_SCROLL_ERROR;
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}
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return TK_SCROLL_MOVETO;
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} else if ((c == 's')
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&& (strncmp(argv[2], "scroll", length) == 0)) {
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if (argc != 5) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " ", argv[1], " scroll number units|pages\"",
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(char *) NULL);
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return TK_SCROLL_ERROR;
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}
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if (Tcl_GetInt(interp, argv[3], intPtr) != TCL_OK) {
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return TK_SCROLL_ERROR;
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}
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length = strlen(argv[4]);
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c = argv[4][0];
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if ((c == 'p') && (strncmp(argv[4], "pages", length) == 0)) {
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return TK_SCROLL_PAGES;
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} else if ((c == 'u')
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&& (strncmp(argv[4], "units", length) == 0)) {
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return TK_SCROLL_UNITS;
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} else {
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Tcl_AppendResult(interp, "bad argument \"", argv[4],
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"\": must be units or pages", (char *) NULL);
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return TK_SCROLL_ERROR;
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}
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}
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Tcl_AppendResult(interp, "unknown option \"", argv[2],
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"\": must be moveto or scroll", (char *) NULL);
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return TK_SCROLL_ERROR;
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}
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/*
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*---------------------------------------------------------------------------
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*
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* TkFindStateString --
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*
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* Given a lookup table, map a number to a string in the table.
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*
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* Results:
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* If numKey was equal to the numeric key of one of the elements
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* in the table, returns the string key of that element.
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* Returns NULL if numKey was not equal to any of the numeric keys
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* in the table.
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*
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* Side effects.
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* None.
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*
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*---------------------------------------------------------------------------
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*/
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char *
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TkFindStateString(mapPtr, numKey)
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CONST TkStateMap *mapPtr; /* The state table. */
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int numKey; /* The key to try to find in the table. */
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{
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for ( ; mapPtr->strKey != NULL; mapPtr++) {
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if (numKey == mapPtr->numKey) {
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return mapPtr->strKey;
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}
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}
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return NULL;
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}
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/*
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*---------------------------------------------------------------------------
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*
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* TkFindStateNum --
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*
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* Given a lookup table, map a string to a number in the table.
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*
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* Results:
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* If strKey was equal to the string keys of one of the elements
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* in the table, returns the numeric key of that element.
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* Returns the numKey associated with the last element (the NULL
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* string one) in the table if strKey was not equal to any of the
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* string keys in the table. In that case, an error message is
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* also left in interp->result (if interp is not NULL).
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*
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* Side effects.
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* None.
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*
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*---------------------------------------------------------------------------
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*/
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int
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TkFindStateNum(interp, field, mapPtr, strKey)
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Tcl_Interp *interp; /* Interp for error reporting. */
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CONST char *field; /* String to use when constructing error. */
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CONST TkStateMap *mapPtr; /* Lookup table. */
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CONST char *strKey; /* String to try to find in lookup table. */
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{
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CONST TkStateMap *mPtr;
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if (mapPtr->strKey == NULL) {
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panic("TkFindStateNum: no choices in lookup table");
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}
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for (mPtr = mapPtr; mPtr->strKey != NULL; mPtr++) {
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if (strcmp(strKey, mPtr->strKey) == 0) {
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return mPtr->numKey;
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}
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}
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if (interp != NULL) {
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mPtr = mapPtr;
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Tcl_AppendResult(interp, "bad ", field, " value \"", strKey,
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"\": must be ", mPtr->strKey, (char *) NULL);
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for (mPtr++; mPtr->strKey != NULL; mPtr++) {
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Tcl_AppendResult(interp, ", ", mPtr->strKey, (char *) NULL);
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}
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}
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return mPtr->numKey;
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}
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