/[dtapublic]/projs/dtats/trunk/shared_source/c_tk_base_7_5_w_mods/tkscrollbar.c

Diff of /projs/dtats/trunk/shared_source/c_tk_base_7_5_w_mods/tkscrollbar.c

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-revision 69 by dashley,
Sat Nov  5 10:54:17 2016 UTC
+revision 71 by dashley,
Sat Nov  5 11:07:06 2016 UTC
 Line 1
  /* $Header$ */
  /*
   * 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 2001/06/13 05:07:52 dtashley 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, 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->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. */
      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. */
      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;
      }
  }
  /* End of tkscrollbar.c */

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