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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 1.13 97/06/06 11:16:22
- */
-
- #include "tkInt.h"
- #include "tkPort.h"
-
- /*
- *----------------------------------------------------------------------
- *
- * TkDrawInsetFocusHighlight --
- *
- * This procedure draws a rectangular ring around the outside of
- * a widget to indicate that it has received the input focus. It
- * takes an additional padding argument that specifies how much
- * padding is present outside th widget.
- *
- * Results:
- * None.
- *
- * Side effects:
- * A rectangle "width" pixels wide is drawn in "drawable",
- * corresponding to the outer area of "tkwin".
- *
- *----------------------------------------------------------------------
- */
-
- void
- TkDrawInsetFocusHighlight(tkwin, gc, width, drawable, padding)
- 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). */
- int padding; /* Width of padding outside of widget. */
- {
- XRectangle rects[4];
-
- /*
- * On the Macintosh the highlight ring needs to be "padded"
- * out by one pixel. Unfortunantly, none of the Tk widgets
- * had a notion of padding between the focus ring and the
- * widget. So we add this padding here. This introduces
- * two things to worry about:
- *
- * 1) The widget must draw the background color covering
- * the focus ring area before calling Tk_DrawFocus.
- * 2) It is impossible to draw a focus ring of width 1.
- * (For the Macintosh Look & Feel use width of 3)
- */
- #ifdef MAC_TCL
- width--;
- #endif
-
- rects[0].x = padding;
- rects[0].y = padding;
- rects[0].width = Tk_Width(tkwin) - (2 * padding);
- rects[0].height = width;
- rects[1].x = padding;
- rects[1].y = Tk_Height(tkwin) - width - padding;
- rects[1].width = Tk_Width(tkwin) - (2 * padding);
- rects[1].height = width;
- rects[2].x = padding;
- rects[2].y = width + padding;
- rects[2].width = width;
- rects[2].height = Tk_Height(tkwin) - 2*width - 2*padding;
- rects[3].x = Tk_Width(tkwin) - width - padding;
- rects[3].y = rects[2].y;
- rects[3].width = width;
- rects[3].height = rects[2].height;
- XFillRectangles(Tk_Display(tkwin), drawable, gc, rects, 4);
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * 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). */
- {
- TkDrawInsetFocusHighlight(tkwin, gc, width, drawable, 0);
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * 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;
- }
-
- /*
- *---------------------------------------------------------------------------
- *
- * TkComputeAnchor --
- *
- * Determine where to place a rectangle so that it will be properly
- * anchored with respect to the given window. Used by widgets
- * to align a box of text inside a window. When anchoring with
- * respect to one of the sides, the rectangle be placed inside of
- * the internal border of the window.
- *
- * Results:
- * *xPtr and *yPtr set to the upper-left corner of the rectangle
- * anchored in the window.
- *
- * Side effects:
- * None.
- *
- *---------------------------------------------------------------------------
- */
- void
- TkComputeAnchor(anchor, tkwin, padX, padY, innerWidth, innerHeight, xPtr, yPtr)
- Tk_Anchor anchor; /* Desired anchor. */
- Tk_Window tkwin; /* Anchored with respect to this window. */
- int padX, padY; /* Use this extra padding inside window, in
- * addition to the internal border. */
- int innerWidth, innerHeight;/* Size of rectangle to anchor in window. */
- int *xPtr, *yPtr; /* Returns upper-left corner of anchored
- * rectangle. */
- {
- switch (anchor) {
- case TK_ANCHOR_NW:
- case TK_ANCHOR_W:
- case TK_ANCHOR_SW:
- *xPtr = Tk_InternalBorderWidth(tkwin) + padX;
- break;
-
- case TK_ANCHOR_N:
- case TK_ANCHOR_CENTER:
- case TK_ANCHOR_S:
- *xPtr = (Tk_Width(tkwin) - innerWidth) / 2;
- break;
-
- default:
- *xPtr = Tk_Width(tkwin) - (Tk_InternalBorderWidth(tkwin) + padX)
- - innerWidth;
- break;
- }
-
- switch (anchor) {
- case TK_ANCHOR_NW:
- case TK_ANCHOR_N:
- case TK_ANCHOR_NE:
- *yPtr = Tk_InternalBorderWidth(tkwin) + padY;
- break;
-
- case TK_ANCHOR_W:
- case TK_ANCHOR_CENTER:
- case TK_ANCHOR_E:
- *yPtr = (Tk_Height(tkwin) - innerHeight) / 2;
- break;
-
- default:
- *yPtr = Tk_Height(tkwin) - Tk_InternalBorderWidth(tkwin) - padY
- - innerHeight;
- break;
- }
- }
-
- /*
- *---------------------------------------------------------------------------
- *
- * TkFindStateString --
- *
- * Given a lookup table, map a number to a string in the table.
- *
- * Results:
- * If numKey was equal to the numeric key of one of the elements
- * in the table, returns the string key of that element.
- * Returns NULL if numKey was not equal to any of the numeric keys
- * in the table.
- *
- * Side effects.
- * None.
- *
- *---------------------------------------------------------------------------
- */
-
- char *
- TkFindStateString(mapPtr, numKey)
- CONST TkStateMap *mapPtr; /* The state table. */
- int numKey; /* The key to try to find in the table. */
- {
- for ( ; mapPtr->strKey != NULL; mapPtr++) {
- if (numKey == mapPtr->numKey) {
- return mapPtr->strKey;
- }
- }
- return NULL;
- }
-
- /*
- *---------------------------------------------------------------------------
- *
- * TkFindStateNum --
- *
- * Given a lookup table, map a string to a number in the table.
- *
- * Results:
- * If strKey was equal to the string keys of one of the elements
- * in the table, returns the numeric key of that element.
- * Returns the numKey associated with the last element (the NULL
- * string one) in the table if strKey was not equal to any of the
- * string keys in the table. In that case, an error message is
- * also left in interp->result (if interp is not NULL).
- *
- * Side effects.
- * None.
- *
- *---------------------------------------------------------------------------
- */
-
- int
- TkFindStateNum(interp, field, mapPtr, strKey)
- Tcl_Interp *interp; /* Interp for error reporting. */
- CONST char *field; /* String to use when constructing error. */
- CONST TkStateMap *mapPtr; /* Lookup table. */
- CONST char *strKey; /* String to try to find in lookup table. */
- {
- CONST TkStateMap *mPtr;
-
- if (mapPtr->strKey == NULL) {
- panic("TkFindStateNum: no choices in lookup table");
- }
-
- for (mPtr = mapPtr; mPtr->strKey != NULL; mPtr++) {
- if (strcmp(strKey, mPtr->strKey) == 0) {
- return mPtr->numKey;
- }
- }
- if (interp != NULL) {
- mPtr = mapPtr;
- Tcl_AppendResult(interp, "bad ", field, " value \"", strKey,
- "\": must be ", mPtr->strKey, (char *) NULL);
- for (mPtr++; mPtr->strKey != NULL; mPtr++) {
- Tcl_AppendResult(interp, ", ", mPtr->strKey, (char *) NULL);
- }
- }
- return mPtr->numKey;
- }
-