Tk Source Code

All scrollable widgets have \fBxview\fR and \fByview\fR commands
that take exactly the additional arguments appended by the scrollbar
as described in \fBSCROLLING COMMANDS\fR below.
.OP \-elementborderwidth elementBorderWidth BorderWidth
Specifies the width of borders drawn around the internal elements
of the scrollbar (the two arrows and the slider).  The value may
have any of the forms acceptable to \fBTk_GetPixels\fR.
If this value is the empth string (the default), the value of
the \fB\-borderwidth\fR option is used in its place.
.OP \-width width Width
Specifies the desired narrow dimension of the scrollbar window,
not including 3-D border, if any.  For vertical
scrollbars this will be the width and for horizontal scrollbars
this will be the height.
The value may have any of the forms acceptable to \fBTk_GetPixels\fR.
.BE

    scrollPtr->activeBorder = NULL;
    scrollPtr->troughColorPtr = NULL;
    scrollPtr->relief = TK_RELIEF_FLAT;
    scrollPtr->highlightWidth = 0;
    scrollPtr->highlightBgColorPtr = NULL;
    scrollPtr->highlightColorPtr = NULL;
    scrollPtr->inset = 0;
    scrollPtr->elementBorderWidth = INT_MIN;
    scrollPtr->arrowLength = 0;
    scrollPtr->sliderFirst = 0;
    scrollPtr->sliderLast = 0;
    scrollPtr->activeField = 0;
    scrollPtr->activeRelief = TK_RELIEF_RAISED;
    scrollPtr->firstFraction = 0.0;
    scrollPtr->lastFraction = 0.0;

     */

    if (scrollPtr->command != NULL) {
        scrollPtr->commandSize = (int) strlen(scrollPtr->command);
    } else {
	scrollPtr->commandSize = 0;
    }
    if (scrollPtr->highlightWidth < 0) {
	scrollPtr->highlightWidth = 0;
    }
    if (scrollPtr->elementBorderWidth < 0) {
	scrollPtr->elementBorderWidth = INT_MIN;
    }

    /*
     * Configure platform specific options.
     */

    TkpConfigureScrollbar(scrollPtr);

#define DEF_SCROLLBAR_ACTIVE_BG_MONO	BLACK
#define DEF_SCROLLBAR_ACTIVE_RELIEF	"raised"
#define DEF_SCROLLBAR_BG_COLOR		NORMAL_BG
#define DEF_SCROLLBAR_BG_MONO		WHITE
#define DEF_SCROLLBAR_BORDER_WIDTH	"0"
#define DEF_SCROLLBAR_COMMAND		""
#define DEF_SCROLLBAR_CURSOR		""
#define DEF_SCROLLBAR_EL_BORDER_WIDTH	NULL
#define DEF_SCROLLBAR_HIGHLIGHT_BG	NORMAL_BG
#define DEF_SCROLLBAR_HIGHLIGHT		NORMAL_FG
#define DEF_SCROLLBAR_HIGHLIGHT_WIDTH	"0"
#define DEF_SCROLLBAR_JUMP		"0"
#define DEF_SCROLLBAR_ORIENT		"vertical"
#define DEF_SCROLLBAR_RELIEF		"flat"
#define DEF_SCROLLBAR_REPEAT_DELAY	"300"

	msPtr->info.value = factor * scrollPtr->firstFraction;
    }

    if ((scrollPtr->firstFraction <= 0.0 && scrollPtr->lastFraction >= 1.0)
	    || height <= metrics.minHeight) {
    	msPtr->info.enableState = kThemeTrackHideTrack;
    } else {
	msPtr->info.enableState = kThemeTrackActive;
	msPtr->info.attributes =
		kThemeTrackShowThumb | kThemeTrackThumbRgnIsNotGhost;
    }
}

/*
 *--------------------------------------------------------------
 *

#define DEF_SCROLLBAR_ACTIVE_BG_MONO	BLACK
#define DEF_SCROLLBAR_ACTIVE_RELIEF	"raised"
#define DEF_SCROLLBAR_BG_COLOR		NORMAL_BG
#define DEF_SCROLLBAR_BG_MONO		WHITE
#define DEF_SCROLLBAR_BORDER_WIDTH	"1"
#define DEF_SCROLLBAR_COMMAND		""
#define DEF_SCROLLBAR_CURSOR		""
#define DEF_SCROLLBAR_EL_BORDER_WIDTH	NULL
#define DEF_SCROLLBAR_HIGHLIGHT_BG	NORMAL_BG
#define DEF_SCROLLBAR_HIGHLIGHT		BLACK
#define DEF_SCROLLBAR_HIGHLIGHT_WIDTH	"0"
#define DEF_SCROLLBAR_JUMP		"0"
#define DEF_SCROLLBAR_ORIENT		"vertical"
#define DEF_SCROLLBAR_RELIEF		"sunken"
#define DEF_SCROLLBAR_REPEAT_DELAY	"300"

TkpComputeScrollbarGeometry(
    TkScrollbar *scrollPtr)
				/* Scrollbar whose geometry may have
				 * changed. */
{
    int width, fieldLength;




    scrollPtr->inset = scrollPtr->highlightWidth + scrollPtr->borderWidth;
    width = (scrollPtr->vertical) ? Tk_Width(scrollPtr->tkwin)
	    : Tk_Height(scrollPtr->tkwin);

    /*
     * Next line assumes that the arrow area is a square.
     */

#define DEF_SCROLLBAR_ACTIVE_BG_MONO	BLACK
#define DEF_SCROLLBAR_ACTIVE_RELIEF	"raised"
#define DEF_SCROLLBAR_BG_COLOR		NORMAL_BG
#define DEF_SCROLLBAR_BG_MONO		WHITE
#define DEF_SCROLLBAR_BORDER_WIDTH	"0"
#define DEF_SCROLLBAR_COMMAND		""
#define DEF_SCROLLBAR_CURSOR		""
#define DEF_SCROLLBAR_EL_BORDER_WIDTH	NULL
#define DEF_SCROLLBAR_HIGHLIGHT_BG	NORMAL_BG
#define DEF_SCROLLBAR_HIGHLIGHT	HIGHLIGHT
#define DEF_SCROLLBAR_HIGHLIGHT_WIDTH	"0"
#define DEF_SCROLLBAR_JUMP		"0"
#define DEF_SCROLLBAR_ORIENT		"vertical"
#define DEF_SCROLLBAR_RELIEF		"sunken"
#define DEF_SCROLLBAR_REPEAT_DELAY	"300"

    int fieldLength, minThumbSize;

    /*
     * Windows doesn't use focus rings on scrollbars, but we still perform
     * basic sanity checks to appease backwards compatibility.
     */





    if (scrollPtr->vertical) {
	scrollPtr->arrowLength = vArrowHeight;
	fieldLength = Tk_Height(scrollPtr->tkwin);
	minThumbSize = vThumb;
    } else {
	scrollPtr->arrowLength = hArrowWidth;
	fieldLength = Tk_Width(scrollPtr->tkwin);