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 1.13 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;
}