Initial revision

FossilOrigin-Name: 2bf55ca9aa942b581137b9f474da5ad9c1480de4

1 files changed, 691 insertions, 0 deletions

diff --git a/generic/tkScrollbar.c b/generic/tkScrollbar.c
new file mode 100644
index 0000000..3025a78
--- /dev/null
+++ b/generic/tkScrollbar.c
@@ -0,0 +1,691 @@
+/* 
+ * 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.
+ *
+ * SCCS: @(#) tkScrollbar.c 1.94 97/07/31 09:12:44
+ */
+
+#include "tkPort.h"
+#include "tkScrollbar.h"
+#include "default.h"
+
+/*
+ * 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_UID, "-orient", "orient", "Orient",
+	DEF_SCROLLBAR_ORIENT, Tk_Offset(TkScrollbar, orientUid), 0},
+    {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, char **argv,
+			    int flags));
+static void		ScrollbarCmdDeletedProc _ANSI_ARGS_((
+			    ClientData clientData));
+static int		ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData,
+			    Tcl_Interp *, int argc, 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. */
+    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);
+
+    TkSetClassProcs(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->orientUid = NULL;
+    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;
+    }
+
+    interp->result = Tk_PathName(scrollPtr->tkwin);
+    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. */
+    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:		interp->result = "arrow1";	break;
+		case SLIDER:		interp->result = "slider";	break;
+		case BOTTOM_ARROW:	interp->result = "arrow2";	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;
+
+	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(interp->result, "%g", fraction);
+    } else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) {
+	int x, y, pos, length;
+	double fraction;
+
+	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(interp->result, "%g", fraction);
+    } 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 {
+	    sprintf(interp->result, "%d %d %d %d", scrollPtr->totalUnits,
+		    scrollPtr->windowUnits, scrollPtr->firstUnit,
+		    scrollPtr->lastUnit);
+	}
+    } 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:	interp->result = "arrow1";	break;
+	    case TOP_GAP:	interp->result = "trough1";	break;
+	    case SLIDER:	interp->result = "slider";	break;
+	    case BOTTOM_GAP:	interp->result = "trough2";	break;
+	    case BOTTOM_ARROW:	interp->result = "arrow2";	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 interp->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. */
+    char **argv;			/* Arguments. */
+    int flags;				/* Flags to pass to
+					 * Tk_ConfigureWidget. */
+{
+    size_t length;
+
+    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 parsing the
+     * orientation or setting the background from a 3-D border.
+     */
+
+    length = strlen(scrollPtr->orientUid);
+    if (strncmp(scrollPtr->orientUid, "vertical", length) == 0) {
+	scrollPtr->vertical = 1;
+    } else if (strncmp(scrollPtr->orientUid, "horizontal", length) == 0) {
+	scrollPtr->vertical = 0;
+    } else {
+	Tcl_AppendResult(interp, "bad orientation \"", scrollPtr->orientUid,
+		"\": must be vertical or horizontal", (char *) NULL);
+	return TCL_ERROR;
+    }
+
+    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;
+    }
+}