489 lines
14 KiB
C
489 lines
14 KiB
C
/*
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* tkUnixScrollbar.c --
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*
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* This file implements the Unix 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 of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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#include "tkInt.h"
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#include "tkScrollbar.h"
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/*
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* Minimum slider length, in pixels (designed to make sure that the slider is
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* always easy to grab with the mouse).
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*/
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#define MIN_SLIDER_LENGTH 5
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/*
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* Declaration of Unix specific scrollbar structure.
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*/
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typedef struct UnixScrollbar {
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TkScrollbar info; /* Generic scrollbar info. */
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GC troughGC; /* For drawing trough. */
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GC copyGC; /* Used for copying from pixmap onto screen. */
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} UnixScrollbar;
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/*
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* The class procedure table for the scrollbar widget. All fields except size
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* are left initialized to NULL, which should happen automatically since the
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* variable is declared at this scope.
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*/
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const Tk_ClassProcs tkpScrollbarProcs = {
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sizeof(Tk_ClassProcs), /* size */
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NULL, /* worldChangedProc */
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NULL, /* createProc */
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NULL /* modalProc */
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};
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/*
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*----------------------------------------------------------------------
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*
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* TkpCreateScrollbar --
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*
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* Allocate a new TkScrollbar structure.
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*
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* Results:
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* Returns a newly allocated TkScrollbar structure.
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*
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* Side effects:
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* Registers an event handler for the widget.
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*
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*----------------------------------------------------------------------
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*/
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TkScrollbar *
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TkpCreateScrollbar(
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Tk_Window tkwin)
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{
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UnixScrollbar *scrollPtr = (UnixScrollbar *)ckalloc(sizeof(UnixScrollbar));
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scrollPtr->troughGC = NULL;
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scrollPtr->copyGC = NULL;
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Tk_CreateEventHandler(tkwin,
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ExposureMask|StructureNotifyMask|FocusChangeMask,
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TkScrollbarEventProc, scrollPtr);
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return (TkScrollbar *) scrollPtr;
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}
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/*
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*--------------------------------------------------------------
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*
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* TkpDisplayScrollbar --
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*
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* This procedure redraws the contents of a scrollbar window. It is
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* invoked as a do-when-idle handler, so it only runs when there's
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* nothing else for the application to do.
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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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* Information appears on the screen.
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*
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*--------------------------------------------------------------
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*/
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void
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TkpDisplayScrollbar(
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ClientData clientData) /* Information about window. */
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{
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TkScrollbar *scrollPtr = (TkScrollbar *)clientData;
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Tk_Window tkwin = scrollPtr->tkwin;
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XPoint points[7];
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Tk_3DBorder border;
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int relief, width, elementBorderWidth;
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Pixmap pixmap;
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if ((scrollPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
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goto done;
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}
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if (scrollPtr->vertical) {
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width = Tk_Width(tkwin) - 2*scrollPtr->inset;
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} else {
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width = Tk_Height(tkwin) - 2*scrollPtr->inset;
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}
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elementBorderWidth = scrollPtr->elementBorderWidth;
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if (elementBorderWidth < 0) {
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elementBorderWidth = scrollPtr->borderWidth;
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}
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/*
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* In order to avoid screen flashes, this procedure redraws the scrollbar
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* in a pixmap, then copies the pixmap to the screen in a single
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* operation. This means that there's no point in time where the on-sreen
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* image has been cleared.
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*/
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pixmap = Tk_GetPixmap(scrollPtr->display, Tk_WindowId(tkwin),
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Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
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if (scrollPtr->highlightWidth != 0) {
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GC gc;
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if (scrollPtr->flags & GOT_FOCUS) {
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gc = Tk_GCForColor(scrollPtr->highlightColorPtr, pixmap);
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} else {
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gc = Tk_GCForColor(scrollPtr->highlightBgColorPtr, pixmap);
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}
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Tk_DrawFocusHighlight(tkwin, gc, scrollPtr->highlightWidth, pixmap);
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}
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Tk_Draw3DRectangle(tkwin, pixmap, scrollPtr->bgBorder,
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scrollPtr->highlightWidth, scrollPtr->highlightWidth,
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Tk_Width(tkwin) - 2*scrollPtr->highlightWidth,
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Tk_Height(tkwin) - 2*scrollPtr->highlightWidth,
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scrollPtr->borderWidth, scrollPtr->relief);
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XFillRectangle(scrollPtr->display, pixmap,
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((UnixScrollbar*)scrollPtr)->troughGC,
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scrollPtr->inset, scrollPtr->inset,
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(unsigned) (Tk_Width(tkwin) - 2*scrollPtr->inset),
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(unsigned) (Tk_Height(tkwin) - 2*scrollPtr->inset));
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/*
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* Draw the top or left arrow. The coordinates of the polygon points
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* probably seem odd, but they were carefully chosen with respect to X's
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* rules for filling polygons. These point choices cause the arrows to
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* just fill the narrow dimension of the scrollbar and be properly
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* centered.
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*/
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if (scrollPtr->activeField == TOP_ARROW) {
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border = scrollPtr->activeBorder;
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relief = scrollPtr->activeField == TOP_ARROW ? scrollPtr->activeRelief
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: TK_RELIEF_RAISED;
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} else {
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border = scrollPtr->bgBorder;
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relief = TK_RELIEF_RAISED;
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}
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if (scrollPtr->vertical) {
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points[0].x = scrollPtr->inset - 1;
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points[0].y = scrollPtr->arrowLength + scrollPtr->inset - 1;
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points[1].x = width + scrollPtr->inset;
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points[1].y = points[0].y;
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points[2].x = width/2 + scrollPtr->inset;
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points[2].y = scrollPtr->inset - 1;
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Tk_Fill3DPolygon(tkwin, pixmap, border, points, 3,
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elementBorderWidth, relief);
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} else {
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points[0].x = scrollPtr->arrowLength + scrollPtr->inset - 1;
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points[0].y = scrollPtr->inset - 1;
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points[1].x = scrollPtr->inset;
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points[1].y = width/2 + scrollPtr->inset;
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points[2].x = points[0].x;
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points[2].y = width + scrollPtr->inset;
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Tk_Fill3DPolygon(tkwin, pixmap, border, points, 3,
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elementBorderWidth, relief);
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}
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/*
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* Display the bottom or right arrow.
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*/
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if (scrollPtr->activeField == BOTTOM_ARROW) {
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border = scrollPtr->activeBorder;
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relief = scrollPtr->activeField == BOTTOM_ARROW
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? scrollPtr->activeRelief : TK_RELIEF_RAISED;
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} else {
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border = scrollPtr->bgBorder;
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relief = TK_RELIEF_RAISED;
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}
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if (scrollPtr->vertical) {
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points[0].x = scrollPtr->inset;
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points[0].y = Tk_Height(tkwin) - scrollPtr->arrowLength
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- scrollPtr->inset + 1;
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points[1].x = width/2 + scrollPtr->inset;
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points[1].y = Tk_Height(tkwin) - scrollPtr->inset;
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points[2].x = width + scrollPtr->inset;
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points[2].y = points[0].y;
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Tk_Fill3DPolygon(tkwin, pixmap, border,
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points, 3, elementBorderWidth, relief);
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} else {
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points[0].x = Tk_Width(tkwin) - scrollPtr->arrowLength
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- scrollPtr->inset + 1;
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points[0].y = scrollPtr->inset - 1;
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points[1].x = points[0].x;
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points[1].y = width + scrollPtr->inset;
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points[2].x = Tk_Width(tkwin) - scrollPtr->inset;
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points[2].y = width/2 + scrollPtr->inset;
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Tk_Fill3DPolygon(tkwin, pixmap, border,
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points, 3, elementBorderWidth, relief);
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}
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/*
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* Display the slider.
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*/
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if (scrollPtr->activeField == SLIDER) {
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border = scrollPtr->activeBorder;
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relief = scrollPtr->activeField == SLIDER ? scrollPtr->activeRelief
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: TK_RELIEF_RAISED;
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} else {
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border = scrollPtr->bgBorder;
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relief = TK_RELIEF_RAISED;
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}
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if (scrollPtr->vertical) {
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Tk_Fill3DRectangle(tkwin, pixmap, border,
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scrollPtr->inset, scrollPtr->sliderFirst,
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width, scrollPtr->sliderLast - scrollPtr->sliderFirst,
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elementBorderWidth, relief);
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} else {
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Tk_Fill3DRectangle(tkwin, pixmap, border,
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scrollPtr->sliderFirst, scrollPtr->inset,
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scrollPtr->sliderLast - scrollPtr->sliderFirst, width,
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elementBorderWidth, relief);
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}
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/*
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* Copy the information from the off-screen pixmap onto the screen, then
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* delete the pixmap.
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*/
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XCopyArea(scrollPtr->display, pixmap, Tk_WindowId(tkwin),
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((UnixScrollbar*)scrollPtr)->copyGC, 0, 0,
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(unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin), 0, 0);
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Tk_FreePixmap(scrollPtr->display, pixmap);
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done:
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scrollPtr->flags &= ~REDRAW_PENDING;
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpComputeScrollbarGeometry --
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*
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* After changes in a scrollbar's size or configuration, this procedure
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* recomputes various geometry information used in displaying the
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* scrollbar.
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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 scrollbar will be displayed differently.
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*
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*----------------------------------------------------------------------
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*/
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extern void
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TkpComputeScrollbarGeometry(
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TkScrollbar *scrollPtr)
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/* Scrollbar whose geometry may have
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* changed. */
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{
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int width, fieldLength;
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if (scrollPtr->highlightWidth < 0) {
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scrollPtr->highlightWidth = 0;
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}
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scrollPtr->inset = scrollPtr->highlightWidth + scrollPtr->borderWidth;
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width = (scrollPtr->vertical) ? Tk_Width(scrollPtr->tkwin)
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: Tk_Height(scrollPtr->tkwin);
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/*
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* Next line assumes that the arrow area is a square.
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*/
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scrollPtr->arrowLength = width - 2*scrollPtr->inset + 1;
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fieldLength = (scrollPtr->vertical ? Tk_Height(scrollPtr->tkwin)
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: Tk_Width(scrollPtr->tkwin))
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- 2*(scrollPtr->arrowLength + scrollPtr->inset);
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if (fieldLength < 0) {
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fieldLength = 0;
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}
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scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
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scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;
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/*
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* Adjust the slider so that some piece of it is always displayed in the
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* scrollbar and so that it has at least a minimal width (so it can be
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* grabbed with the mouse).
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*/
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if (scrollPtr->sliderFirst > fieldLength - MIN_SLIDER_LENGTH) {
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scrollPtr->sliderFirst = fieldLength - MIN_SLIDER_LENGTH;
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}
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if (scrollPtr->sliderFirst < 0) {
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scrollPtr->sliderFirst = 0;
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}
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if (scrollPtr->sliderLast < scrollPtr->sliderFirst + MIN_SLIDER_LENGTH) {
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scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
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}
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if (scrollPtr->sliderLast > fieldLength) {
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scrollPtr->sliderLast = fieldLength;
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}
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scrollPtr->sliderFirst += scrollPtr->arrowLength + scrollPtr->inset;
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scrollPtr->sliderLast += scrollPtr->arrowLength + scrollPtr->inset;
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/*
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* Register the desired geometry for the window (leave enough space for
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* the two arrows plus a minimum-size slider, plus border around the whole
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* window, if any). Then arrange for the window to be redisplayed.
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*/
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if (scrollPtr->vertical) {
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Tk_GeometryRequest(scrollPtr->tkwin,
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scrollPtr->width + 2*scrollPtr->inset,
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2*(scrollPtr->arrowLength + scrollPtr->borderWidth
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+ scrollPtr->inset));
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} else {
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Tk_GeometryRequest(scrollPtr->tkwin,
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2*(scrollPtr->arrowLength + scrollPtr->borderWidth
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+ scrollPtr->inset), scrollPtr->width + 2*scrollPtr->inset);
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}
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Tk_SetInternalBorder(scrollPtr->tkwin, scrollPtr->inset);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpDestroyScrollbar --
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*
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* Free data structures associated with the scrollbar control.
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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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* Frees the GCs associated with the scrollbar.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkpDestroyScrollbar(
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TkScrollbar *scrollPtr)
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{
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UnixScrollbar *unixScrollPtr = (UnixScrollbar *)scrollPtr;
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if (unixScrollPtr->troughGC != NULL) {
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Tk_FreeGC(scrollPtr->display, unixScrollPtr->troughGC);
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}
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if (unixScrollPtr->copyGC != NULL) {
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Tk_FreeGC(scrollPtr->display, unixScrollPtr->copyGC);
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* TkpConfigureScrollbar --
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*
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* This procedure is called after the generic code has finished
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* processing configuration options, in order to configure platform
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* specific options.
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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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* Configuration info may get changed.
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*
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*----------------------------------------------------------------------
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*/
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void
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TkpConfigureScrollbar(
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TkScrollbar *scrollPtr)
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/* Information about widget; may or may not
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* already have values for some fields. */
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{
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XGCValues gcValues;
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GC newGC;
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UnixScrollbar *unixScrollPtr = (UnixScrollbar *) scrollPtr;
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Tk_SetBackgroundFromBorder(scrollPtr->tkwin, scrollPtr->bgBorder);
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gcValues.foreground = scrollPtr->troughColorPtr->pixel;
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newGC = Tk_GetGC(scrollPtr->tkwin, GCForeground, &gcValues);
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if (unixScrollPtr->troughGC != NULL) {
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Tk_FreeGC(scrollPtr->display, unixScrollPtr->troughGC);
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}
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unixScrollPtr->troughGC = newGC;
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if (unixScrollPtr->copyGC == NULL) {
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gcValues.graphics_exposures = False;
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unixScrollPtr->copyGC = Tk_GetGC(scrollPtr->tkwin,
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GCGraphicsExposures, &gcValues);
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}
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}
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/*
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*--------------------------------------------------------------
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*
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* TkpScrollbarPosition --
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*
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* Determine the scrollbar element corresponding to a given position.
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*
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* Results:
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* One of TOP_ARROW, TOP_GAP, etc., indicating which element of the
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* scrollbar covers the position given by (x, y). If (x,y) is outside the
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* scrollbar entirely, then OUTSIDE is returned.
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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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TkpScrollbarPosition(
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TkScrollbar *scrollPtr,
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/* Scrollbar widget record. */
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int x, int y) /* Coordinates within scrollPtr's window. */
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{
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int length, width, tmp;
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const int inset = scrollPtr->inset;
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if (scrollPtr->vertical) {
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length = Tk_Height(scrollPtr->tkwin);
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width = Tk_Width(scrollPtr->tkwin);
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} else {
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tmp = x;
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x = y;
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y = tmp;
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length = Tk_Width(scrollPtr->tkwin);
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width = Tk_Height(scrollPtr->tkwin);
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}
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if (x<inset || x>=width-inset || y<inset || y>=length-inset) {
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return OUTSIDE;
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}
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/*
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* All of the calculations in this procedure mirror those in
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* TkpDisplayScrollbar. Be sure to keep the two consistent.
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*/
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if (y < inset + scrollPtr->arrowLength) {
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return TOP_ARROW;
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}
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if (y < scrollPtr->sliderFirst) {
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return TOP_GAP;
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}
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if (y < scrollPtr->sliderLast) {
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return SLIDER;
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}
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if (y >= length - (scrollPtr->arrowLength + inset)) {
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return BOTTOM_ARROW;
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}
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return BOTTOM_GAP;
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}
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 4
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* fill-column: 78
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* End:
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*/
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