833 lines
24 KiB
C
833 lines
24 KiB
C
/*
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* tkUnixScale.c --
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*
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* This file implements the X specific portion of the scrollbar
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* widget.
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*
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* Copyright (c) 1996 by 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: @(#) tkUnixScale.c 1.5 96/07/31 14:22:29
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*/
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#include "tkScale.h"
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#include "tkInt.h"
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/*
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* Forward declarations for procedures defined later in this file:
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*/
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static void DisplayHorizontalScale _ANSI_ARGS_((TkScale *scalePtr,
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Drawable drawable, XRectangle *drawnAreaPtr));
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static void DisplayHorizontalValue _ANSI_ARGS_((TkScale *scalePtr,
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Drawable drawable, double value, int top));
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static void DisplayVerticalScale _ANSI_ARGS_((TkScale *scalePtr,
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Drawable drawable, XRectangle *drawnAreaPtr));
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static void DisplayVerticalValue _ANSI_ARGS_((TkScale *scalePtr,
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Drawable drawable, double value, int rightEdge));
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/*
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*----------------------------------------------------------------------
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*
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* TkpCreateScale --
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*
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* Allocate a new TkScale structure.
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*
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* Results:
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* Returns a newly allocated TkScale structure.
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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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TkScale *
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TkpCreateScale(tkwin)
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Tk_Window tkwin;
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{
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return (TkScale *) ckalloc(sizeof(TkScale));
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpDestroyScale --
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*
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* Destroy a TkScale structure.
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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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* Memory is freed.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkpDestroyScale(scalePtr)
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TkScale *scalePtr;
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{
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ckfree((char *) scalePtr);
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}
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/*
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*--------------------------------------------------------------
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*
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* DisplayVerticalScale --
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*
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* This procedure redraws the contents of a vertical scale
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* window. It is invoked as a do-when-idle handler, so it only
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* runs when there's nothing else for the application to do.
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*
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* Results:
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* There is no return value. If only a part of the scale needs
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* to be redrawn, then drawnAreaPtr is modified to reflect the
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* area that was actually modified.
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*
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* Side effects:
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* Information appears on the screen.
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*
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*--------------------------------------------------------------
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*/
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static void
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DisplayVerticalScale(scalePtr, drawable, drawnAreaPtr)
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TkScale *scalePtr; /* Widget record for scale. */
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Drawable drawable; /* Where to display scale (window
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* or pixmap). */
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XRectangle *drawnAreaPtr; /* Initally contains area of window;
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* if only a part of the scale is
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* redrawn, gets modified to reflect
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* the part of the window that was
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* redrawn. */
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{
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Tk_Window tkwin = scalePtr->tkwin;
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int x, y, width, height, shadowWidth;
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double tickValue;
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Tk_3DBorder sliderBorder;
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/*
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* Display the information from left to right across the window.
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*/
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if (!(scalePtr->flags & REDRAW_OTHER)) {
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drawnAreaPtr->x = scalePtr->vertTickRightX;
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drawnAreaPtr->y = scalePtr->inset;
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drawnAreaPtr->width = scalePtr->vertTroughX + scalePtr->width
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+ 2*scalePtr->borderWidth - scalePtr->vertTickRightX;
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drawnAreaPtr->height -= 2*scalePtr->inset;
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}
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Tk_Fill3DRectangle(tkwin, drawable, scalePtr->bgBorder,
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drawnAreaPtr->x, drawnAreaPtr->y, drawnAreaPtr->width,
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drawnAreaPtr->height, 0, TK_RELIEF_FLAT);
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if (scalePtr->flags & REDRAW_OTHER) {
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/*
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* Display the tick marks.
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*/
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if (scalePtr->tickInterval != 0) {
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for (tickValue = scalePtr->fromValue; ;
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tickValue += scalePtr->tickInterval) {
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/*
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* The TkRoundToResolution call gets rid of accumulated
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* round-off errors, if any.
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*/
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tickValue = TkRoundToResolution(scalePtr, tickValue);
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if (scalePtr->toValue >= scalePtr->fromValue) {
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if (tickValue > scalePtr->toValue) {
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break;
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}
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} else {
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if (tickValue < scalePtr->toValue) {
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break;
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}
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}
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DisplayVerticalValue(scalePtr, drawable, tickValue,
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scalePtr->vertTickRightX);
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}
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}
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}
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/*
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* Display the value, if it is desired.
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*/
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if (scalePtr->showValue) {
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DisplayVerticalValue(scalePtr, drawable, scalePtr->value,
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scalePtr->vertValueRightX);
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}
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/*
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* Display the trough and the slider.
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*/
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Tk_Draw3DRectangle(tkwin, drawable,
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scalePtr->bgBorder, scalePtr->vertTroughX, scalePtr->inset,
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scalePtr->width + 2*scalePtr->borderWidth,
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Tk_Height(tkwin) - 2*scalePtr->inset, scalePtr->borderWidth,
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TK_RELIEF_SUNKEN);
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XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC,
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scalePtr->vertTroughX + scalePtr->borderWidth,
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scalePtr->inset + scalePtr->borderWidth,
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(unsigned) scalePtr->width,
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(unsigned) (Tk_Height(tkwin) - 2*scalePtr->inset
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- 2*scalePtr->borderWidth));
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if (scalePtr->state == tkActiveUid) {
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sliderBorder = scalePtr->activeBorder;
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} else {
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sliderBorder = scalePtr->bgBorder;
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}
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width = scalePtr->width;
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height = scalePtr->sliderLength/2;
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x = scalePtr->vertTroughX + scalePtr->borderWidth;
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y = TkpValueToPixel(scalePtr, scalePtr->value) - height;
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shadowWidth = scalePtr->borderWidth/2;
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if (shadowWidth == 0) {
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shadowWidth = 1;
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}
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Tk_Draw3DRectangle(tkwin, drawable, sliderBorder, x, y, width,
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2*height, shadowWidth, scalePtr->sliderRelief);
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x += shadowWidth;
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y += shadowWidth;
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width -= 2*shadowWidth;
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height -= shadowWidth;
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Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y, width,
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height, shadowWidth, scalePtr->sliderRelief);
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Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y+height,
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width, height, shadowWidth, scalePtr->sliderRelief);
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/*
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* Draw the label to the right of the scale.
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*/
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if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelLength != 0)) {
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Tk_FontMetrics fm;
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Tk_GetFontMetrics(scalePtr->tkfont, &fm);
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Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC,
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scalePtr->tkfont, scalePtr->label, scalePtr->labelLength,
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scalePtr->vertLabelX, scalePtr->inset + (3*fm.ascent)/2);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* DisplayVerticalValue --
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*
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* This procedure is called to display values (scale readings)
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* for vertically-oriented scales.
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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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* The numerical value corresponding to value is displayed with
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* its right edge at "rightEdge", and at a vertical position in
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* the scale that corresponds to "value".
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*
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*----------------------------------------------------------------------
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*/
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static void
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DisplayVerticalValue(scalePtr, drawable, value, rightEdge)
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register TkScale *scalePtr; /* Information about widget in which to
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* display value. */
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Drawable drawable; /* Pixmap or window in which to draw
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* the value. */
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double value; /* Y-coordinate of number to display,
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* specified in application coords, not
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* in pixels (we'll compute pixels). */
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int rightEdge; /* X-coordinate of right edge of text,
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* specified in pixels. */
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{
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register Tk_Window tkwin = scalePtr->tkwin;
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int y, width, length;
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char valueString[PRINT_CHARS];
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Tk_FontMetrics fm;
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Tk_GetFontMetrics(scalePtr->tkfont, &fm);
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y = TkpValueToPixel(scalePtr, value) + fm.ascent/2;
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sprintf(valueString, scalePtr->format, value);
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length = strlen(valueString);
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width = Tk_TextWidth(scalePtr->tkfont, valueString, length);
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/*
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* Adjust the y-coordinate if necessary to keep the text entirely
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* inside the window.
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*/
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if ((y - fm.ascent) < (scalePtr->inset + SPACING)) {
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y = scalePtr->inset + SPACING + fm.ascent;
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}
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if ((y + fm.descent) > (Tk_Height(tkwin) - scalePtr->inset - SPACING)) {
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y = Tk_Height(tkwin) - scalePtr->inset - SPACING - fm.descent;
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}
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Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC,
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scalePtr->tkfont, valueString, length, rightEdge - width, y);
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}
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/*
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*--------------------------------------------------------------
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*
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* DisplayHorizontalScale --
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*
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* This procedure redraws the contents of a horizontal scale
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* window. It is invoked as a do-when-idle handler, so it only
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* runs when there's nothing else for the application to do.
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*
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* Results:
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* There is no return value. If only a part of the scale needs
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* to be redrawn, then drawnAreaPtr is modified to reflect the
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* area that was actually modified.
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*
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* Side effects:
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* Information appears on the screen.
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*
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*--------------------------------------------------------------
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*/
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static void
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DisplayHorizontalScale(scalePtr, drawable, drawnAreaPtr)
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TkScale *scalePtr; /* Widget record for scale. */
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Drawable drawable; /* Where to display scale (window
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* or pixmap). */
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XRectangle *drawnAreaPtr; /* Initally contains area of window;
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* if only a part of the scale is
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* redrawn, gets modified to reflect
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* the part of the window that was
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* redrawn. */
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{
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register Tk_Window tkwin = scalePtr->tkwin;
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int x, y, width, height, shadowWidth;
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double tickValue;
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Tk_3DBorder sliderBorder;
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/*
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* Display the information from bottom to top across the window.
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*/
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if (!(scalePtr->flags & REDRAW_OTHER)) {
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drawnAreaPtr->x = scalePtr->inset;
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drawnAreaPtr->y = scalePtr->horizValueY;
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drawnAreaPtr->width -= 2*scalePtr->inset;
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drawnAreaPtr->height = scalePtr->horizTroughY + scalePtr->width
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+ 2*scalePtr->borderWidth - scalePtr->horizValueY;
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}
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Tk_Fill3DRectangle(tkwin, drawable, scalePtr->bgBorder,
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drawnAreaPtr->x, drawnAreaPtr->y, drawnAreaPtr->width,
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drawnAreaPtr->height, 0, TK_RELIEF_FLAT);
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if (scalePtr->flags & REDRAW_OTHER) {
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/*
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* Display the tick marks.
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*/
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if (scalePtr->tickInterval != 0) {
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for (tickValue = scalePtr->fromValue; ;
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tickValue += scalePtr->tickInterval) {
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/*
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* The TkRoundToResolution call gets rid of accumulated
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* round-off errors, if any.
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*/
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tickValue = TkRoundToResolution(scalePtr, tickValue);
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if (scalePtr->toValue >= scalePtr->fromValue) {
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if (tickValue > scalePtr->toValue) {
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break;
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}
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} else {
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if (tickValue < scalePtr->toValue) {
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break;
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}
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}
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DisplayHorizontalValue(scalePtr, drawable, tickValue,
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scalePtr->horizTickY);
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}
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}
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}
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/*
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* Display the value, if it is desired.
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*/
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if (scalePtr->showValue) {
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DisplayHorizontalValue(scalePtr, drawable, scalePtr->value,
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scalePtr->horizValueY);
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}
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/*
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* Display the trough and the slider.
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*/
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y = scalePtr->horizTroughY;
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Tk_Draw3DRectangle(tkwin, drawable,
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scalePtr->bgBorder, scalePtr->inset, y,
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Tk_Width(tkwin) - 2*scalePtr->inset,
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scalePtr->width + 2*scalePtr->borderWidth,
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scalePtr->borderWidth, TK_RELIEF_SUNKEN);
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XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC,
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scalePtr->inset + scalePtr->borderWidth,
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y + scalePtr->borderWidth,
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(unsigned) (Tk_Width(tkwin) - 2*scalePtr->inset
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- 2*scalePtr->borderWidth),
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(unsigned) scalePtr->width);
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if (scalePtr->state == tkActiveUid) {
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sliderBorder = scalePtr->activeBorder;
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} else {
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sliderBorder = scalePtr->bgBorder;
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}
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width = scalePtr->sliderLength/2;
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height = scalePtr->width;
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x = TkpValueToPixel(scalePtr, scalePtr->value) - width;
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y += scalePtr->borderWidth;
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shadowWidth = scalePtr->borderWidth/2;
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if (shadowWidth == 0) {
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shadowWidth = 1;
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}
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Tk_Draw3DRectangle(tkwin, drawable, sliderBorder,
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x, y, 2*width, height, shadowWidth, scalePtr->sliderRelief);
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x += shadowWidth;
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y += shadowWidth;
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width -= shadowWidth;
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height -= 2*shadowWidth;
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Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y, width, height,
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shadowWidth, scalePtr->sliderRelief);
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Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x+width, y,
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width, height, shadowWidth, scalePtr->sliderRelief);
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/*
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* Draw the label at the top of the scale.
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*/
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if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelLength != 0)) {
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Tk_FontMetrics fm;
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Tk_GetFontMetrics(scalePtr->tkfont, &fm);
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Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC,
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scalePtr->tkfont, scalePtr->label, scalePtr->labelLength,
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scalePtr->inset + fm.ascent/2, scalePtr->horizLabelY + fm.ascent);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* DisplayHorizontalValue --
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*
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* This procedure is called to display values (scale readings)
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* for horizontally-oriented scales.
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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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* The numerical value corresponding to value is displayed with
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* its bottom edge at "bottom", and at a horizontal position in
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* the scale that corresponds to "value".
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*
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*----------------------------------------------------------------------
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*/
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static void
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DisplayHorizontalValue(scalePtr, drawable, value, top)
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register TkScale *scalePtr; /* Information about widget in which to
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* display value. */
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Drawable drawable; /* Pixmap or window in which to draw
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* the value. */
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double value; /* X-coordinate of number to display,
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* specified in application coords, not
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* in pixels (we'll compute pixels). */
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int top; /* Y-coordinate of top edge of text,
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* specified in pixels. */
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{
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register Tk_Window tkwin = scalePtr->tkwin;
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int x, y, length, width;
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char valueString[PRINT_CHARS];
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Tk_FontMetrics fm;
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x = TkpValueToPixel(scalePtr, value);
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Tk_GetFontMetrics(scalePtr->tkfont, &fm);
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y = top + fm.ascent;
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sprintf(valueString, scalePtr->format, value);
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length = strlen(valueString);
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width = Tk_TextWidth(scalePtr->tkfont, valueString, length);
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/*
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* Adjust the x-coordinate if necessary to keep the text entirely
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* inside the window.
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*/
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x -= (width)/2;
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if (x < (scalePtr->inset + SPACING)) {
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x = scalePtr->inset + SPACING;
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}
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if (x > (Tk_Width(tkwin) - scalePtr->inset)) {
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x = Tk_Width(tkwin) - scalePtr->inset - SPACING - width;
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}
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Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC,
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scalePtr->tkfont, valueString, length, x, y);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpDisplayScale --
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*
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* This procedure is invoked as an idle handler to redisplay
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* the contents of a scale widget.
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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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* The scale gets redisplayed.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkpDisplayScale(clientData)
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ClientData clientData; /* Widget record for scale. */
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{
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TkScale *scalePtr = (TkScale *) clientData;
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Tk_Window tkwin = scalePtr->tkwin;
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Tcl_Interp *interp = scalePtr->interp;
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Pixmap pixmap;
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int result;
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char string[PRINT_CHARS];
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XRectangle drawnArea;
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if ((scalePtr->tkwin == NULL) || !Tk_IsMapped(scalePtr->tkwin)) {
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goto done;
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}
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/*
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* Invoke the scale's command if needed.
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*/
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Tcl_Preserve((ClientData) scalePtr);
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Tcl_Preserve((ClientData) interp);
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if ((scalePtr->flags & INVOKE_COMMAND) && (scalePtr->command != NULL)) {
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sprintf(string, scalePtr->format, scalePtr->value);
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result = Tcl_VarEval(interp, scalePtr->command, " ", string,
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(char *) NULL);
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if (result != TCL_OK) {
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Tcl_AddErrorInfo(interp, "\n (command executed by scale)");
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Tcl_BackgroundError(interp);
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}
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}
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Tcl_Release((ClientData) interp);
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scalePtr->flags &= ~INVOKE_COMMAND;
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if (scalePtr->tkwin == NULL) {
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Tcl_Release((ClientData) scalePtr);
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return;
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}
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Tcl_Release((ClientData) scalePtr);
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/*
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* In order to avoid screen flashes, this procedure redraws
|
||
* the scale in a pixmap, then copies the pixmap to the
|
||
* screen in a single operation. This means that there's no
|
||
* point in time where the on-sreen image has been cleared.
|
||
*/
|
||
|
||
pixmap = Tk_GetPixmap(scalePtr->display, Tk_WindowId(tkwin),
|
||
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
|
||
drawnArea.x = 0;
|
||
drawnArea.y = 0;
|
||
drawnArea.width = Tk_Width(tkwin);
|
||
drawnArea.height = Tk_Height(tkwin);
|
||
|
||
/*
|
||
* Much of the redisplay is done totally differently for
|
||
* horizontal and vertical scales. Handle the part that's
|
||
* different.
|
||
*/
|
||
|
||
if (scalePtr->vertical) {
|
||
DisplayVerticalScale(scalePtr, pixmap, &drawnArea);
|
||
} else {
|
||
DisplayHorizontalScale(scalePtr, pixmap, &drawnArea);
|
||
}
|
||
|
||
/*
|
||
* Now handle the part of redisplay that is the same for
|
||
* horizontal and vertical scales: border and traversal
|
||
* highlight.
|
||
*/
|
||
|
||
if (scalePtr->flags & REDRAW_OTHER) {
|
||
if (scalePtr->relief != TK_RELIEF_FLAT) {
|
||
Tk_Draw3DRectangle(tkwin, pixmap, scalePtr->bgBorder,
|
||
scalePtr->highlightWidth, scalePtr->highlightWidth,
|
||
Tk_Width(tkwin) - 2*scalePtr->highlightWidth,
|
||
Tk_Height(tkwin) - 2*scalePtr->highlightWidth,
|
||
scalePtr->borderWidth, scalePtr->relief);
|
||
}
|
||
if (scalePtr->highlightWidth != 0) {
|
||
GC gc;
|
||
|
||
if (scalePtr->flags & GOT_FOCUS) {
|
||
gc = Tk_GCForColor(scalePtr->highlightColorPtr, pixmap);
|
||
} else {
|
||
gc = Tk_GCForColor(scalePtr->highlightBgColorPtr, pixmap);
|
||
}
|
||
Tk_DrawFocusHighlight(tkwin, gc, scalePtr->highlightWidth, pixmap);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Copy the information from the off-screen pixmap onto the screen,
|
||
* then delete the pixmap.
|
||
*/
|
||
|
||
XCopyArea(scalePtr->display, pixmap, Tk_WindowId(tkwin),
|
||
scalePtr->copyGC, drawnArea.x, drawnArea.y, drawnArea.width,
|
||
drawnArea.height, drawnArea.x, drawnArea.y);
|
||
Tk_FreePixmap(scalePtr->display, pixmap);
|
||
|
||
done:
|
||
scalePtr->flags &= ~REDRAW_ALL;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkpScaleElement --
|
||
*
|
||
* Determine which part of a scale widget lies under a given
|
||
* point.
|
||
*
|
||
* Results:
|
||
* The return value is either TROUGH1, SLIDER, TROUGH2, or
|
||
* OTHER, depending on which of the scale's active elements
|
||
* (if any) is under the point at (x,y).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkpScaleElement(scalePtr, x, y)
|
||
TkScale *scalePtr; /* Widget record for scale. */
|
||
int x, y; /* Coordinates within scalePtr's window. */
|
||
{
|
||
int sliderFirst;
|
||
|
||
if (scalePtr->vertical) {
|
||
if ((x < scalePtr->vertTroughX)
|
||
|| (x >= (scalePtr->vertTroughX + 2*scalePtr->borderWidth +
|
||
scalePtr->width))) {
|
||
return OTHER;
|
||
}
|
||
if ((y < scalePtr->inset)
|
||
|| (y >= (Tk_Height(scalePtr->tkwin) - scalePtr->inset))) {
|
||
return OTHER;
|
||
}
|
||
sliderFirst = TkpValueToPixel(scalePtr, scalePtr->value)
|
||
- scalePtr->sliderLength/2;
|
||
if (y < sliderFirst) {
|
||
return TROUGH1;
|
||
}
|
||
if (y < (sliderFirst+scalePtr->sliderLength)) {
|
||
return SLIDER;
|
||
}
|
||
return TROUGH2;
|
||
}
|
||
|
||
if ((y < scalePtr->horizTroughY)
|
||
|| (y >= (scalePtr->horizTroughY + 2*scalePtr->borderWidth +
|
||
scalePtr->width))) {
|
||
return OTHER;
|
||
}
|
||
if ((x < scalePtr->inset)
|
||
|| (x >= (Tk_Width(scalePtr->tkwin) - scalePtr->inset))) {
|
||
return OTHER;
|
||
}
|
||
sliderFirst = TkpValueToPixel(scalePtr, scalePtr->value)
|
||
- scalePtr->sliderLength/2;
|
||
if (x < sliderFirst) {
|
||
return TROUGH1;
|
||
}
|
||
if (x < (sliderFirst+scalePtr->sliderLength)) {
|
||
return SLIDER;
|
||
}
|
||
return TROUGH2;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkpSetScaleValue --
|
||
*
|
||
* This procedure changes the value of a scale and invokes
|
||
* a Tcl command to reflect the current position of a scale
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* A Tcl command is invoked, and an additional error-processing
|
||
* command may also be invoked. The scale's slider is redrawn.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkpSetScaleValue(scalePtr, value, setVar, invokeCommand)
|
||
register TkScale *scalePtr; /* Info about widget. */
|
||
double value; /* New value for scale. Gets adjusted
|
||
* if it's off the scale. */
|
||
int setVar; /* Non-zero means reflect new value through
|
||
* to associated variable, if any. */
|
||
int invokeCommand; /* Non-zero means invoked -command option
|
||
* to notify of new value, 0 means don't. */
|
||
{
|
||
char string[PRINT_CHARS];
|
||
|
||
value = TkRoundToResolution(scalePtr, value);
|
||
if ((value < scalePtr->fromValue)
|
||
^ (scalePtr->toValue < scalePtr->fromValue)) {
|
||
value = scalePtr->fromValue;
|
||
}
|
||
if ((value > scalePtr->toValue)
|
||
^ (scalePtr->toValue < scalePtr->fromValue)) {
|
||
value = scalePtr->toValue;
|
||
}
|
||
if (scalePtr->flags & NEVER_SET) {
|
||
scalePtr->flags &= ~NEVER_SET;
|
||
} else if (scalePtr->value == value) {
|
||
return;
|
||
}
|
||
scalePtr->value = value;
|
||
if (invokeCommand) {
|
||
scalePtr->flags |= INVOKE_COMMAND;
|
||
}
|
||
TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
|
||
|
||
if (setVar && (scalePtr->varName != NULL)) {
|
||
sprintf(string, scalePtr->format, scalePtr->value);
|
||
scalePtr->flags |= SETTING_VAR;
|
||
#ifdef STk_CODE
|
||
STk_tcl_setvar(scalePtr->varName, string, 0, scalePtr->env);
|
||
#else
|
||
Tcl_SetVar(scalePtr->interp, scalePtr->varName, string,
|
||
TCL_GLOBAL_ONLY);
|
||
#endif
|
||
scalePtr->flags &= ~SETTING_VAR;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkpPixelToValue --
|
||
*
|
||
* Given a pixel within a scale window, return the scale
|
||
* reading corresponding to that pixel.
|
||
*
|
||
* Results:
|
||
* A double-precision scale reading. If the value is outside
|
||
* the legal range for the scale then it's rounded to the nearest
|
||
* end of the scale.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
double
|
||
TkpPixelToValue(scalePtr, x, y)
|
||
register TkScale *scalePtr; /* Information about widget. */
|
||
int x, y; /* Coordinates of point within
|
||
* window. */
|
||
{
|
||
double value, pixelRange;
|
||
|
||
if (scalePtr->vertical) {
|
||
pixelRange = Tk_Height(scalePtr->tkwin) - scalePtr->sliderLength
|
||
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
|
||
value = y;
|
||
} else {
|
||
pixelRange = Tk_Width(scalePtr->tkwin) - scalePtr->sliderLength
|
||
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
|
||
value = x;
|
||
}
|
||
|
||
if (pixelRange <= 0) {
|
||
/*
|
||
* Not enough room for the slider to actually slide: just return
|
||
* the scale's current value.
|
||
*/
|
||
|
||
return scalePtr->value;
|
||
}
|
||
value -= scalePtr->sliderLength/2 + scalePtr->inset
|
||
+ scalePtr->borderWidth;
|
||
value /= pixelRange;
|
||
if (value < 0) {
|
||
value = 0;
|
||
}
|
||
if (value > 1) {
|
||
value = 1;
|
||
}
|
||
value = scalePtr->fromValue +
|
||
value * (scalePtr->toValue - scalePtr->fromValue);
|
||
return TkRoundToResolution(scalePtr, value);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkpValueToPixel --
|
||
*
|
||
* Given a reading of the scale, return the x-coordinate or
|
||
* y-coordinate corresponding to that reading, depending on
|
||
* whether the scale is vertical or horizontal, respectively.
|
||
*
|
||
* Results:
|
||
* An integer value giving the pixel location corresponding
|
||
* to reading. The value is restricted to lie within the
|
||
* defined range for the scale.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkpValueToPixel(scalePtr, value)
|
||
register TkScale *scalePtr; /* Information about widget. */
|
||
double value; /* Reading of the widget. */
|
||
{
|
||
int y, pixelRange;
|
||
double valueRange;
|
||
|
||
valueRange = scalePtr->toValue - scalePtr->fromValue;
|
||
pixelRange = (scalePtr->vertical ? Tk_Height(scalePtr->tkwin)
|
||
: Tk_Width(scalePtr->tkwin)) - scalePtr->sliderLength
|
||
- 2*scalePtr->inset - 2*scalePtr->borderWidth;
|
||
if (valueRange == 0) {
|
||
y = 0;
|
||
} else {
|
||
y = (int) ((value - scalePtr->fromValue) * pixelRange
|
||
/ valueRange + 0.5);
|
||
if (y < 0) {
|
||
y = 0;
|
||
} else if (y > pixelRange) {
|
||
y = pixelRange;
|
||
}
|
||
}
|
||
y += scalePtr->sliderLength/2 + scalePtr->inset + scalePtr->borderWidth;
|
||
return y;
|
||
}
|