/* * tkScrollbar.c -- * * This module implements a scrollbar widgets for the Tk * toolkit. A scrollbar displays a slider and two arrows; * mouse clicks on features within the scrollbar cause * scrolling commands to be invoked. * * Copyright (c) 1990-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tkScrollbar.c,v 1.1.1.1 2007/07/10 15:05:17 duncan Exp $ */ #include "tkPort.h" #include "tkScrollbar.h" #include "default.h" /* * Custom option for handling "-orient" */ static Tk_CustomOption orientOption = { (Tk_OptionParseProc *) TkOrientParseProc, TkOrientPrintProc, (ClientData) NULL }; /* * Information used for argv parsing. */ Tk_ConfigSpec tkpScrollbarConfigSpecs[] = { {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground", DEF_SCROLLBAR_ACTIVE_BG_COLOR, Tk_Offset(TkScrollbar, activeBorder), TK_CONFIG_COLOR_ONLY}, {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground", DEF_SCROLLBAR_ACTIVE_BG_MONO, Tk_Offset(TkScrollbar, activeBorder), TK_CONFIG_MONO_ONLY}, {TK_CONFIG_RELIEF, "-activerelief", "activeRelief", "Relief", DEF_SCROLLBAR_ACTIVE_RELIEF, Tk_Offset(TkScrollbar, activeRelief), 0}, {TK_CONFIG_BORDER, "-background", "background", "Background", DEF_SCROLLBAR_BG_COLOR, Tk_Offset(TkScrollbar, bgBorder), TK_CONFIG_COLOR_ONLY}, {TK_CONFIG_BORDER, "-background", "background", "Background", DEF_SCROLLBAR_BG_MONO, Tk_Offset(TkScrollbar, bgBorder), TK_CONFIG_MONO_ONLY}, {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL, (char *) NULL, 0, 0}, {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL, (char *) NULL, 0, 0}, {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth", DEF_SCROLLBAR_BORDER_WIDTH, Tk_Offset(TkScrollbar, borderWidth), 0}, {TK_CONFIG_STRING, "-command", "command", "Command", DEF_SCROLLBAR_COMMAND, Tk_Offset(TkScrollbar, command), TK_CONFIG_NULL_OK}, {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor", DEF_SCROLLBAR_CURSOR, Tk_Offset(TkScrollbar, cursor), TK_CONFIG_NULL_OK}, {TK_CONFIG_PIXELS, "-elementborderwidth", "elementBorderWidth", "BorderWidth", DEF_SCROLLBAR_EL_BORDER_WIDTH, Tk_Offset(TkScrollbar, elementBorderWidth), 0}, {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground", "HighlightBackground", DEF_SCROLLBAR_HIGHLIGHT_BG, Tk_Offset(TkScrollbar, highlightBgColorPtr), 0}, {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor", DEF_SCROLLBAR_HIGHLIGHT, Tk_Offset(TkScrollbar, highlightColorPtr), 0}, {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness", "HighlightThickness", DEF_SCROLLBAR_HIGHLIGHT_WIDTH, Tk_Offset(TkScrollbar, highlightWidth), 0}, {TK_CONFIG_BOOLEAN, "-jump", "jump", "Jump", DEF_SCROLLBAR_JUMP, Tk_Offset(TkScrollbar, jump), 0}, {TK_CONFIG_CUSTOM, "-orient", "orient", "Orient", DEF_SCROLLBAR_ORIENT, Tk_Offset(TkScrollbar, vertical), 0, &orientOption}, {TK_CONFIG_RELIEF, "-relief", "relief", "Relief", DEF_SCROLLBAR_RELIEF, Tk_Offset(TkScrollbar, relief), 0}, {TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay", DEF_SCROLLBAR_REPEAT_DELAY, Tk_Offset(TkScrollbar, repeatDelay), 0}, {TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval", DEF_SCROLLBAR_REPEAT_INTERVAL, Tk_Offset(TkScrollbar, repeatInterval), 0}, {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus", DEF_SCROLLBAR_TAKE_FOCUS, Tk_Offset(TkScrollbar, takeFocus), TK_CONFIG_NULL_OK}, {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background", DEF_SCROLLBAR_TROUGH_COLOR, Tk_Offset(TkScrollbar, troughColorPtr), TK_CONFIG_COLOR_ONLY}, {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background", DEF_SCROLLBAR_TROUGH_MONO, Tk_Offset(TkScrollbar, troughColorPtr), TK_CONFIG_MONO_ONLY}, {TK_CONFIG_PIXELS, "-width", "width", "Width", DEF_SCROLLBAR_WIDTH, Tk_Offset(TkScrollbar, width), 0}, {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, 0} }; /* * Forward declarations for procedures defined later in this file: */ static int ConfigureScrollbar _ANSI_ARGS_((Tcl_Interp *interp, TkScrollbar *scrollPtr, int argc, CONST char **argv, int flags)); static void ScrollbarCmdDeletedProc _ANSI_ARGS_(( ClientData clientData)); static int ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData, Tcl_Interp *, int argc, CONST char **argv)); /* *-------------------------------------------------------------- * * Tk_ScrollbarCmd -- * * This procedure is invoked to process the "scrollbar" Tcl * command. See the user documentation for details on what * it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *-------------------------------------------------------------- */ int Tk_ScrollbarCmd(clientData, interp, argc, argv) ClientData clientData; /* Main window associated with * interpreter. */ Tcl_Interp *interp; /* Current interpreter. */ int argc; /* Number of arguments. */ CONST char **argv; /* Argument strings. */ { Tk_Window tkwin = (Tk_Window) clientData; register TkScrollbar *scrollPtr; Tk_Window new; if (argc < 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " pathName ?options?\"", (char *) NULL); return TCL_ERROR; } new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL); if (new == NULL) { return TCL_ERROR; } Tk_SetClass(new, "Scrollbar"); scrollPtr = TkpCreateScrollbar(new); Tk_SetClassProcs(new, &tkpScrollbarProcs, (ClientData) scrollPtr); /* * Initialize fields that won't be initialized by ConfigureScrollbar, * or which ConfigureScrollbar expects to have reasonable values * (e.g. resource pointers). */ scrollPtr->tkwin = new; scrollPtr->display = Tk_Display(new); scrollPtr->interp = interp; scrollPtr->widgetCmd = Tcl_CreateCommand(interp, Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd, (ClientData) scrollPtr, ScrollbarCmdDeletedProc); scrollPtr->vertical = 0; scrollPtr->width = 0; scrollPtr->command = NULL; scrollPtr->commandSize = 0; scrollPtr->repeatDelay = 0; scrollPtr->repeatInterval = 0; scrollPtr->borderWidth = 0; scrollPtr->bgBorder = NULL; 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 = -1; scrollPtr->arrowLength = 0; scrollPtr->sliderFirst = 0; scrollPtr->sliderLast = 0; scrollPtr->activeField = 0; scrollPtr->activeRelief = TK_RELIEF_RAISED; scrollPtr->totalUnits = 0; scrollPtr->windowUnits = 0; scrollPtr->firstUnit = 0; scrollPtr->lastUnit = 0; scrollPtr->firstFraction = 0.0; scrollPtr->lastFraction = 0.0; scrollPtr->cursor = None; scrollPtr->takeFocus = NULL; scrollPtr->flags = 0; if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) { Tk_DestroyWindow(scrollPtr->tkwin); return TCL_ERROR; } Tcl_SetResult(interp, Tk_PathName(scrollPtr->tkwin), TCL_STATIC); return TCL_OK; } /* *-------------------------------------------------------------- * * ScrollbarWidgetCmd -- * * This procedure is invoked to process the Tcl command * that corresponds to a widget managed by this module. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *-------------------------------------------------------------- */ static int ScrollbarWidgetCmd(clientData, interp, argc, argv) ClientData clientData; /* Information about scrollbar * widget. */ Tcl_Interp *interp; /* Current interpreter. */ int argc; /* Number of arguments. */ CONST char **argv; /* Argument strings. */ { register TkScrollbar *scrollPtr = (TkScrollbar *) clientData; int result = TCL_OK; size_t length; int c; if (argc < 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " option ?arg arg ...?\"", (char *) NULL); return TCL_ERROR; } Tcl_Preserve((ClientData) scrollPtr); c = argv[1][0]; length = strlen(argv[1]); if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) { int oldActiveField; if (argc == 2) { switch (scrollPtr->activeField) { case TOP_ARROW: Tcl_SetResult(interp, "arrow1", TCL_STATIC); break; case SLIDER: Tcl_SetResult(interp, "slider", TCL_STATIC); break; case BOTTOM_ARROW: Tcl_SetResult(interp, "arrow2", TCL_STATIC); break; } goto done; } if (argc != 3) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " activate element\"", (char *) NULL); goto error; } c = argv[2][0]; length = strlen(argv[2]); oldActiveField = scrollPtr->activeField; if ((c == 'a') && (strcmp(argv[2], "arrow1") == 0)) { scrollPtr->activeField = TOP_ARROW; } else if ((c == 'a') && (strcmp(argv[2], "arrow2") == 0)) { scrollPtr->activeField = BOTTOM_ARROW; } else if ((c == 's') && (strncmp(argv[2], "slider", length) == 0)) { scrollPtr->activeField = SLIDER; } else { scrollPtr->activeField = OUTSIDE; } if (oldActiveField != scrollPtr->activeField) { TkScrollbarEventuallyRedraw(scrollPtr); } } else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0) && (length >= 2)) { if (argc != 3) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " cget option\"", (char *) NULL); goto error; } result = Tk_ConfigureValue(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0); } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0) && (length >= 2)) { if (argc == 2) { result = Tk_ConfigureInfo(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs, (char *) scrollPtr, (char *) NULL, 0); } else if (argc == 3) { result = Tk_ConfigureInfo(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0); } else { result = ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, TK_CONFIG_ARGV_ONLY); } } else if ((c == 'd') && (strncmp(argv[1], "delta", length) == 0)) { int xDelta, yDelta, pixels, length; double fraction; char buf[TCL_DOUBLE_SPACE]; if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " delta xDelta yDelta\"", (char *) NULL); goto error; } if ((Tcl_GetInt(interp, argv[2], &xDelta) != TCL_OK) || (Tcl_GetInt(interp, argv[3], &yDelta) != TCL_OK)) { goto error; } if (scrollPtr->vertical) { pixels = yDelta; length = Tk_Height(scrollPtr->tkwin) - 1 - 2*(scrollPtr->arrowLength + scrollPtr->inset); } else { pixels = xDelta; length = Tk_Width(scrollPtr->tkwin) - 1 - 2*(scrollPtr->arrowLength + scrollPtr->inset); } if (length == 0) { fraction = 0.0; } else { fraction = ((double) pixels / (double) length); } sprintf(buf, "%g", fraction); Tcl_SetResult(interp, buf, TCL_VOLATILE); } else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) { int x, y, pos, length; double fraction; char buf[TCL_DOUBLE_SPACE]; if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " fraction x y\"", (char *) NULL); goto error; } if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK) || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) { goto error; } if (scrollPtr->vertical) { pos = y - (scrollPtr->arrowLength + scrollPtr->inset); length = Tk_Height(scrollPtr->tkwin) - 1 - 2*(scrollPtr->arrowLength + scrollPtr->inset); } else { pos = x - (scrollPtr->arrowLength + scrollPtr->inset); length = Tk_Width(scrollPtr->tkwin) - 1 - 2*(scrollPtr->arrowLength + scrollPtr->inset); } if (length == 0) { fraction = 0.0; } else { fraction = ((double) pos / (double) length); } if (fraction < 0) { fraction = 0; } else if (fraction > 1.0) { fraction = 1.0; } sprintf(buf, "%g", fraction); Tcl_SetResult(interp, buf, TCL_VOLATILE); } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) { if (argc != 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " get\"", (char *) NULL); goto error; } if (scrollPtr->flags & NEW_STYLE_COMMANDS) { char first[TCL_DOUBLE_SPACE], last[TCL_DOUBLE_SPACE]; Tcl_PrintDouble(interp, scrollPtr->firstFraction, first); Tcl_PrintDouble(interp, scrollPtr->lastFraction, last); Tcl_AppendResult(interp, first, " ", last, (char *) NULL); } else { char buf[TCL_INTEGER_SPACE * 4]; sprintf(buf, "%d %d %d %d", scrollPtr->totalUnits, scrollPtr->windowUnits, scrollPtr->firstUnit, scrollPtr->lastUnit); Tcl_SetResult(interp, buf, TCL_VOLATILE); } } else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) { int x, y, thing; if (argc != 4) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " identify x y\"", (char *) NULL); goto error; } if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK) || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) { goto error; } thing = TkpScrollbarPosition(scrollPtr, x,y); switch (thing) { case TOP_ARROW: Tcl_SetResult(interp, "arrow1", TCL_STATIC); break; case TOP_GAP: Tcl_SetResult(interp, "trough1", TCL_STATIC); break; case SLIDER: Tcl_SetResult(interp, "slider", TCL_STATIC); break; case BOTTOM_GAP: Tcl_SetResult(interp, "trough2", TCL_STATIC); break; case BOTTOM_ARROW: Tcl_SetResult(interp, "arrow2", TCL_STATIC); break; } } else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) { int totalUnits, windowUnits, firstUnit, lastUnit; if (argc == 4) { double first, last; if (Tcl_GetDouble(interp, argv[2], &first) != TCL_OK) { goto error; } if (Tcl_GetDouble(interp, argv[3], &last) != TCL_OK) { goto error; } if (first < 0) { scrollPtr->firstFraction = 0; } else if (first > 1.0) { scrollPtr->firstFraction = 1.0; } else { scrollPtr->firstFraction = first; } if (last < scrollPtr->firstFraction) { scrollPtr->lastFraction = scrollPtr->firstFraction; } else if (last > 1.0) { scrollPtr->lastFraction = 1.0; } else { scrollPtr->lastFraction = last; } scrollPtr->flags |= NEW_STYLE_COMMANDS; } else if (argc == 6) { if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) { goto error; } if (totalUnits < 0) { totalUnits = 0; } if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) { goto error; } if (windowUnits < 0) { windowUnits = 0; } if (Tcl_GetInt(interp, argv[4], &firstUnit) != TCL_OK) { goto error; } if (Tcl_GetInt(interp, argv[5], &lastUnit) != TCL_OK) { goto error; } if (totalUnits > 0) { if (lastUnit < firstUnit) { lastUnit = firstUnit; } } else { firstUnit = lastUnit = 0; } scrollPtr->totalUnits = totalUnits; scrollPtr->windowUnits = windowUnits; scrollPtr->firstUnit = firstUnit; scrollPtr->lastUnit = lastUnit; if (scrollPtr->totalUnits == 0) { scrollPtr->firstFraction = 0.0; scrollPtr->lastFraction = 1.0; } else { scrollPtr->firstFraction = ((double) firstUnit)/totalUnits; scrollPtr->lastFraction = ((double) (lastUnit+1))/totalUnits; } scrollPtr->flags &= ~NEW_STYLE_COMMANDS; } else { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " set firstFraction lastFraction\" or \"", argv[0], " set totalUnits windowUnits firstUnit lastUnit\"", (char *) NULL); goto error; } TkpComputeScrollbarGeometry(scrollPtr); TkScrollbarEventuallyRedraw(scrollPtr); } else { Tcl_AppendResult(interp, "bad option \"", argv[1], "\": must be activate, cget, configure, delta, fraction, ", "get, identify, or set", (char *) NULL); goto error; } done: Tcl_Release((ClientData) scrollPtr); return result; error: Tcl_Release((ClientData) scrollPtr); return TCL_ERROR; } /* *---------------------------------------------------------------------- * * ConfigureScrollbar -- * * This procedure is called to process an argv/argc list, plus * the Tk option database, in order to configure (or * reconfigure) a scrollbar widget. * * Results: * The return value is a standard Tcl result. If TCL_ERROR is * returned, then the interp's result contains an error message. * * Side effects: * Configuration information, such as colors, border width, * etc. get set for scrollPtr; old resources get freed, * if there were any. * *---------------------------------------------------------------------- */ static int ConfigureScrollbar(interp, scrollPtr, argc, argv, flags) Tcl_Interp *interp; /* Used for error reporting. */ register TkScrollbar *scrollPtr; /* Information about widget; may or * may not already have values for * some fields. */ int argc; /* Number of valid entries in argv. */ CONST char **argv; /* Arguments. */ int flags; /* Flags to pass to * Tk_ConfigureWidget. */ { if (Tk_ConfigureWidget(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs, argc, argv, (char *) scrollPtr, flags) != TCL_OK) { return TCL_ERROR; } /* * A few options need special processing, such as setting the * background from a 3-D border. */ if (scrollPtr->command != NULL) { scrollPtr->commandSize = strlen(scrollPtr->command); } else { scrollPtr->commandSize = 0; } /* * Configure platform specific options. */ TkpConfigureScrollbar(scrollPtr); /* * Register the desired geometry for the window (leave enough space * for the two arrows plus a minimum-size slider, plus border around * the whole window, if any). Then arrange for the window to be * redisplayed. */ TkpComputeScrollbarGeometry(scrollPtr); TkScrollbarEventuallyRedraw(scrollPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * TkScrollbarEventProc -- * * This procedure is invoked by the Tk dispatcher for various * events on scrollbars. * * Results: * None. * * Side effects: * When the window gets deleted, internal structures get * cleaned up. When it gets exposed, it is redisplayed. * *-------------------------------------------------------------- */ void TkScrollbarEventProc(clientData, eventPtr) ClientData clientData; /* Information about window. */ XEvent *eventPtr; /* Information about event. */ { TkScrollbar *scrollPtr = (TkScrollbar *) clientData; if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) { TkScrollbarEventuallyRedraw(scrollPtr); } else if (eventPtr->type == DestroyNotify) { TkpDestroyScrollbar(scrollPtr); if (scrollPtr->tkwin != NULL) { scrollPtr->tkwin = NULL; Tcl_DeleteCommandFromToken(scrollPtr->interp, scrollPtr->widgetCmd); } if (scrollPtr->flags & REDRAW_PENDING) { Tcl_CancelIdleCall(TkpDisplayScrollbar, (ClientData) scrollPtr); } /* * Free up all the stuff that requires special handling, then * let Tk_FreeOptions handle all the standard option-related * stuff. */ Tk_FreeOptions(tkpScrollbarConfigSpecs, (char *) scrollPtr, scrollPtr->display, 0); Tcl_EventuallyFree((ClientData) scrollPtr, TCL_DYNAMIC); } else if (eventPtr->type == ConfigureNotify) { TkpComputeScrollbarGeometry(scrollPtr); TkScrollbarEventuallyRedraw(scrollPtr); } else if (eventPtr->type == FocusIn) { if (eventPtr->xfocus.detail != NotifyInferior) { scrollPtr->flags |= GOT_FOCUS; if (scrollPtr->highlightWidth > 0) { TkScrollbarEventuallyRedraw(scrollPtr); } } } else if (eventPtr->type == FocusOut) { if (eventPtr->xfocus.detail != NotifyInferior) { scrollPtr->flags &= ~GOT_FOCUS; if (scrollPtr->highlightWidth > 0) { TkScrollbarEventuallyRedraw(scrollPtr); } } } } /* *---------------------------------------------------------------------- * * ScrollbarCmdDeletedProc -- * * This procedure is invoked when a widget command is deleted. If * the widget isn't already in the process of being destroyed, * this command destroys it. * * Results: * None. * * Side effects: * The widget is destroyed. * *---------------------------------------------------------------------- */ static void ScrollbarCmdDeletedProc(clientData) ClientData clientData; /* Pointer to widget record for widget. */ { TkScrollbar *scrollPtr = (TkScrollbar *) clientData; Tk_Window tkwin = scrollPtr->tkwin; /* * This procedure could be invoked either because the window was * destroyed and the command was then deleted (in which case tkwin * is NULL) or because the command was deleted, and then this procedure * destroys the widget. */ if (tkwin != NULL) { scrollPtr->tkwin = NULL; Tk_DestroyWindow(tkwin); } } /* *-------------------------------------------------------------- * * TkScrollbarEventuallyRedraw -- * * Arrange for one or more of the fields of a scrollbar * to be redrawn. * * Results: * None. * * Side effects: * None. * *-------------------------------------------------------------- */ void TkScrollbarEventuallyRedraw(scrollPtr) register TkScrollbar *scrollPtr; /* Information about widget. */ { if ((scrollPtr->tkwin == NULL) || (!Tk_IsMapped(scrollPtr->tkwin))) { return; } if ((scrollPtr->flags & REDRAW_PENDING) == 0) { Tcl_DoWhenIdle(TkpDisplayScrollbar, (ClientData) scrollPtr); scrollPtr->flags |= REDRAW_PENDING; } }