/[dtapublic]/projs/dtats/trunk/shared_source/c_tk_base_7_5_w_mods/tkmessage.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
  /* $Header$ */
  /*
   * tkMessage.c --
   *
   *      This module implements a message widgets for the Tk
   *      toolkit.  A message widget displays a multi-line string
   *      in a window according to a particular aspect ratio.
   *
   * 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: tkmessage.c,v 1.1.1.1 2001/06/13 05:06:15 dtashley Exp $
   */
  #include "tkPort.h"
  #include "default.h"
  #include "tkInt.h"
  /*
   * A data structure of the following type is kept for each message
   * widget managed by this file:
   */
  typedef struct {
      Tk_Window tkwin;            /* Window that embodies the message.  NULL
                                   * means that the window has been destroyed
                                   * but the data structures haven't yet been
                                   * cleaned up.*/
      Display *display;           /* Display containing widget.  Used, among
                                   * other things, so that resources can be
                                   * freed even after tkwin has gone away. */
      Tcl_Interp *interp;         /* Interpreter associated with message. */
      Tcl_Command widgetCmd;      /* Token for message's widget command. */
      /*
       * Information used when displaying widget:
       */
      char *string;               /* String displayed in message. */
      int numChars;               /* Number of characters in string, not
                                   * including terminating NULL. */
      char *textVarName;          /* Name of variable (malloc'ed) or NULL.
                                   * If non-NULL, message displays the contents
                                   * of this variable. */
      Tk_3DBorder border;         /* Structure used to draw 3-D border and
                                   * background.  NULL means a border hasn't
                                   * been created yet. */
      int borderWidth;            /* Width of border. */
      int relief;                 /* 3-D effect: TK_RELIEF_RAISED, etc. */
      int highlightWidth;         /* Width in pixels of highlight to draw
                                   * around widget when it has the focus.
                                   * <= 0 means don't draw a highlight. */
      XColor *highlightBgColorPtr;
                                  /* Color for drawing traversal highlight
                                   * area when highlight is off. */
      XColor *highlightColorPtr;  /* Color for drawing traversal highlight. */
      Tk_Font tkfont;             /* Information about text font, or NULL. */
      XColor *fgColorPtr;         /* Foreground color in normal mode. */
      int padX, padY;             /* User-requested extra space around text. */
      int width;                  /* User-requested width, in pixels.  0 means
                                   * compute width using aspect ratio below. */
      int aspect;                 /* Desired aspect ratio for window
                                   * (100*width/height). */
      int msgWidth;               /* Width in pixels needed to display
                                   * message. */
      int msgHeight;              /* Height in pixels needed to display
                                   * message. */
      Tk_Anchor anchor;           /* Where to position text within window region
                                   * if window is larger or smaller than
                                   * needed. */
      Tk_Justify justify;         /* Justification for text. */
      GC textGC;                  /* GC for drawing text in normal mode. */
      Tk_TextLayout textLayout;   /* Saved layout information. */
      /*
       * Miscellaneous information:
       */
      Tk_Cursor cursor;           /* Current cursor for window, or None. */
      char *takeFocus;            /* Value of -takefocus option;  not used in
                                   * the C code, but used by keyboard traversal
                                   * scripts.  Malloc'ed, but may be NULL. */
      int flags;                  /* Various flags;  see below for
                                   * definitions. */
  } Message;
  /*
   * Flag bits for messages:
   *
   * REDRAW_PENDING:              Non-zero means a DoWhenIdle handler
   *                              has already been queued to redraw
   *                              this window.
   * GOT_FOCUS:                   Non-zero means this button currently
   *                              has the input focus.
   */
  #define REDRAW_PENDING          1
  #define GOT_FOCUS               4
  /*
   * Information used for argv parsing.
   */
  static Tk_ConfigSpec configSpecs[] = {
      {TK_CONFIG_ANCHOR, "-anchor", "anchor", "Anchor",
          DEF_MESSAGE_ANCHOR, Tk_Offset(Message, anchor), 0},
      {TK_CONFIG_INT, "-aspect", "aspect", "Aspect",
          DEF_MESSAGE_ASPECT, Tk_Offset(Message, aspect), 0},
      {TK_CONFIG_BORDER, "-background", "background", "Background",
          DEF_MESSAGE_BG_COLOR, Tk_Offset(Message, border),
          TK_CONFIG_COLOR_ONLY},
      {TK_CONFIG_BORDER, "-background", "background", "Background",
          DEF_MESSAGE_BG_MONO, Tk_Offset(Message, border),
          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_MESSAGE_BORDER_WIDTH, Tk_Offset(Message, borderWidth), 0},
      {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
          DEF_MESSAGE_CURSOR, Tk_Offset(Message, cursor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
          (char *) NULL, 0, 0},
      {TK_CONFIG_FONT, "-font", "font", "Font",
          DEF_MESSAGE_FONT, Tk_Offset(Message, tkfont), 0},
      {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
          DEF_MESSAGE_FG, Tk_Offset(Message, fgColorPtr), 0},
      {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
          "HighlightBackground", DEF_MESSAGE_HIGHLIGHT_BG,
          Tk_Offset(Message, highlightBgColorPtr), 0},
      {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
          DEF_MESSAGE_HIGHLIGHT, Tk_Offset(Message, highlightColorPtr), 0},
      {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
          "HighlightThickness",
          DEF_MESSAGE_HIGHLIGHT_WIDTH, Tk_Offset(Message, highlightWidth), 0},
      {TK_CONFIG_JUSTIFY, "-justify", "justify", "Justify",
          DEF_MESSAGE_JUSTIFY, Tk_Offset(Message, justify), 0},
      {TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
          DEF_MESSAGE_PADX, Tk_Offset(Message, padX), 0},
      {TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
          DEF_MESSAGE_PADY, Tk_Offset(Message, padY), 0},
      {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
          DEF_MESSAGE_RELIEF, Tk_Offset(Message, relief), 0},
      {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
          DEF_MESSAGE_TAKE_FOCUS, Tk_Offset(Message, takeFocus),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_STRING, "-text", "text", "Text",
          DEF_MESSAGE_TEXT, Tk_Offset(Message, string), 0},
      {TK_CONFIG_STRING, "-textvariable", "textVariable", "Variable",
          DEF_MESSAGE_TEXT_VARIABLE, Tk_Offset(Message, textVarName),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_PIXELS, "-width", "width", "Width",
          DEF_MESSAGE_WIDTH, Tk_Offset(Message, 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 void             MessageCmdDeletedProc _ANSI_ARGS_((
                              ClientData clientData));
  static void             MessageEventProc _ANSI_ARGS_((ClientData clientData,
                              XEvent *eventPtr));
  static char *           MessageTextVarProc _ANSI_ARGS_((ClientData clientData,
                              Tcl_Interp *interp, char *name1, char *name2,
                              int flags));
  static int              MessageWidgetCmd _ANSI_ARGS_((ClientData clientData,
                              Tcl_Interp *interp, int argc, char **argv));
  static void             MessageWorldChanged _ANSI_ARGS_((
                              ClientData instanceData));
  static void             ComputeMessageGeometry _ANSI_ARGS_((Message *msgPtr));
  static int              ConfigureMessage _ANSI_ARGS_((Tcl_Interp *interp,
                              Message *msgPtr, int argc, char **argv,
                              int flags));
  static void             DestroyMessage _ANSI_ARGS_((char *memPtr));
  static void             DisplayMessage _ANSI_ARGS_((ClientData clientData));
  /*
   * The structure below defines message class behavior by means of procedures
   * that can be invoked from generic window code.
   */
  static TkClassProcs messageClass = {
      NULL,                       /* createProc. */
      MessageWorldChanged,        /* geometryProc. */
      NULL                        /* modalProc. */
  };
  /*
   *--------------------------------------------------------------
   *
   * Tk_MessageCmd --
   *
   *      This procedure is invoked to process the "message" 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_MessageCmd(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. */
  {
      register Message *msgPtr;
      Tk_Window new;
      Tk_Window tkwin = (Tk_Window) clientData;
      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;
      }
      msgPtr = (Message *) ckalloc(sizeof(Message));
      msgPtr->tkwin = new;
      msgPtr->display = Tk_Display(new);
      msgPtr->interp = interp;
      msgPtr->widgetCmd = Tcl_CreateCommand(interp, Tk_PathName(msgPtr->tkwin),
              MessageWidgetCmd, (ClientData) msgPtr, MessageCmdDeletedProc);
      msgPtr->textLayout = NULL;
      msgPtr->string = NULL;
      msgPtr->numChars = 0;
      msgPtr->textVarName = NULL;
      msgPtr->border = NULL;
      msgPtr->borderWidth = 0;
      msgPtr->relief = TK_RELIEF_FLAT;
      msgPtr->highlightWidth = 0;
      msgPtr->highlightBgColorPtr = NULL;
      msgPtr->highlightColorPtr = NULL;
      msgPtr->tkfont = NULL;
      msgPtr->fgColorPtr = NULL;
      msgPtr->textGC = None;
      msgPtr->padX = 0;
      msgPtr->padY = 0;
      msgPtr->anchor = TK_ANCHOR_CENTER;
      msgPtr->width = 0;
      msgPtr->aspect = 150;
      msgPtr->msgWidth = 0;
      msgPtr->msgHeight = 0;
      msgPtr->justify = TK_JUSTIFY_LEFT;
      msgPtr->cursor = None;
      msgPtr->takeFocus = NULL;
      msgPtr->flags = 0;
      Tk_SetClass(msgPtr->tkwin, "Message");
      TkSetClassProcs(msgPtr->tkwin, &messageClass, (ClientData) msgPtr);
      Tk_CreateEventHandler(msgPtr->tkwin,
              ExposureMask|StructureNotifyMask|FocusChangeMask,
              MessageEventProc, (ClientData) msgPtr);
      if (ConfigureMessage(interp, msgPtr, argc-2, argv+2, 0) != TCL_OK) {
          goto error;
      }
      Tcl_SetResult(interp, Tk_PathName(msgPtr->tkwin), TCL_STATIC);
      return TCL_OK;
      error:
      Tk_DestroyWindow(msgPtr->tkwin);
      return TCL_ERROR;
  }
  /*
   *--------------------------------------------------------------
   *
   * MessageWidgetCmd --
   *
   *      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
  MessageWidgetCmd(clientData, interp, argc, argv)
      ClientData clientData;      /* Information about message widget. */
      Tcl_Interp *interp;         /* Current interpreter. */
      int argc;                   /* Number of arguments. */
      char **argv;                /* Argument strings. */
  {
      register Message *msgPtr = (Message *) clientData;
      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;
      }
      c = argv[1][0];
      length = strlen(argv[1]);
      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);
              return TCL_ERROR;
          }
          return Tk_ConfigureValue(interp, msgPtr->tkwin, configSpecs,
                  (char *) msgPtr, argv[2], 0);
      } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
              && (length  >= 2)) {
          if (argc == 2) {
              return Tk_ConfigureInfo(interp, msgPtr->tkwin, configSpecs,
                      (char *) msgPtr, (char *) NULL, 0);
          } else if (argc == 3) {
              return Tk_ConfigureInfo(interp, msgPtr->tkwin, configSpecs,
                      (char *) msgPtr, argv[2], 0);
          } else {
              return ConfigureMessage(interp, msgPtr, argc-2, argv+2,
                      TK_CONFIG_ARGV_ONLY);
          }
      } else {
          Tcl_AppendResult(interp, "bad option \"", argv[1],
                  "\": must be cget or configure", (char *) NULL);
          return TCL_ERROR;
      }
  }
  /*
   *----------------------------------------------------------------------
   *
   * DestroyMessage --
   *
   *      This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
   *      to clean up the internal structure of a message at a safe time
   *      (when no-one is using it anymore).
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Everything associated with the message is freed up.
   *
   *----------------------------------------------------------------------
   */
  static void
  DestroyMessage(memPtr)
      char *memPtr;               /* Info about message widget. */
  {
      register Message *msgPtr = (Message *) memPtr;
      /*
       * Free up all the stuff that requires special handling, then
       * let Tk_FreeOptions handle all the standard option-related
       * stuff.
       */
      Tk_FreeTextLayout(msgPtr->textLayout);
      if (msgPtr->textVarName != NULL) {
          Tcl_UntraceVar(msgPtr->interp, msgPtr->textVarName,
                  TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                  MessageTextVarProc, (ClientData) msgPtr);
      }
      if (msgPtr->textGC != None) {
          Tk_FreeGC(msgPtr->display, msgPtr->textGC);
      }
      Tk_FreeOptions(configSpecs, (char *) msgPtr, msgPtr->display, 0);
      ckfree((char *) msgPtr);
  }
  /*
   *----------------------------------------------------------------------
   *
   * ConfigureMessage --
   *
   *      This procedure is called to process an argv/argc list, plus
   *      the Tk option database, in order to configure (or
   *      reconfigure) a message 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 text string, colors, font,
   *      etc. get set for msgPtr;  old resources get freed, if there
   *      were any.
   *
   *----------------------------------------------------------------------
   */
  static int
  ConfigureMessage(interp, msgPtr, argc, argv, flags)
      Tcl_Interp *interp;         /* Used for error reporting. */
      register Message *msgPtr;   /* 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. */
  {
      /*
       * Eliminate any existing trace on a variable monitored by the message.
       */
      if (msgPtr->textVarName != NULL) {
          Tcl_UntraceVar(interp, msgPtr->textVarName,
                  TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                  MessageTextVarProc, (ClientData) msgPtr);
      }
      if (Tk_ConfigureWidget(interp, msgPtr->tkwin, configSpecs,
              argc, argv, (char *) msgPtr, flags) != TCL_OK) {
          return TCL_ERROR;
      }
      /*
       * If the message is to display the value of a variable, then set up
       * a trace on the variable's value, create the variable if it doesn't
       * exist, and fetch its current value.
       */
      if (msgPtr->textVarName != NULL) {
          char *value;
          value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY);
          if (value == NULL) {
              Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string,
                      TCL_GLOBAL_ONLY);
          } else {
              if (msgPtr->string != NULL) {
                  ckfree(msgPtr->string);
              }
              msgPtr->string = strcpy(ckalloc(strlen(value) + 1), value);
          }
          Tcl_TraceVar(interp, msgPtr->textVarName,
                  TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                  MessageTextVarProc, (ClientData) msgPtr);
      }
      /*
       * A few other options need special processing, such as setting
       * the background from a 3-D border or handling special defaults
       * that couldn't be specified to Tk_ConfigureWidget.
       */
      msgPtr->numChars = Tcl_NumUtfChars(msgPtr->string, -1);
      if (msgPtr->highlightWidth < 0) {
          msgPtr->highlightWidth = 0;
      }
      MessageWorldChanged((ClientData) msgPtr);
      return TCL_OK;
  }
  /*
   *---------------------------------------------------------------------------
   *
   * MessageWorldChanged --
   *
   *      This procedure is called when the world has changed in some
   *      way and the widget needs to recompute all its graphics contexts
   *      and determine its new geometry.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Message will be relayed out and redisplayed.
   *
   *---------------------------------------------------------------------------
   */
  static void
  MessageWorldChanged(instanceData)
      ClientData instanceData;    /* Information about widget. */
  {
      XGCValues gcValues;
      GC gc = None;
      Tk_FontMetrics fm;
      Message *msgPtr;
      msgPtr = (Message *) instanceData;
      if (msgPtr->border != NULL) {
          Tk_SetBackgroundFromBorder(msgPtr->tkwin, msgPtr->border);
      }
      gcValues.font = Tk_FontId(msgPtr->tkfont);
      gcValues.foreground = msgPtr->fgColorPtr->pixel;
      gc = Tk_GetGC(msgPtr->tkwin, GCForeground | GCFont, &gcValues);
      if (msgPtr->textGC != None) {
          Tk_FreeGC(msgPtr->display, msgPtr->textGC);
      }
      msgPtr->textGC = gc;
      Tk_GetFontMetrics(msgPtr->tkfont, &fm);
      if (msgPtr->padX < 0) {
          msgPtr->padX = fm.ascent / 2;
      }
      if (msgPtr->padY == -1) {
          msgPtr->padY = fm.ascent / 4;
      }
      /*
       * Recompute the desired geometry for the window, and arrange for
       * the window to be redisplayed.
       */
      ComputeMessageGeometry(msgPtr);
      if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin)
              && !(msgPtr->flags & REDRAW_PENDING)) {
          Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
          msgPtr->flags |= REDRAW_PENDING;
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * ComputeMessageGeometry --
   *
   *      Compute the desired geometry for a message window,
   *      taking into account the desired aspect ratio for the
   *      window.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Tk_GeometryRequest is called to inform the geometry
   *      manager of the desired geometry for this window.
   *
   *--------------------------------------------------------------
   */
  static void
  ComputeMessageGeometry(msgPtr)
      register Message *msgPtr;   /* Information about window. */
  {
      int width, inc, height;
      int thisWidth, thisHeight, maxWidth;
      int aspect, lowerBound, upperBound, inset;
      Tk_FreeTextLayout(msgPtr->textLayout);
      inset = msgPtr->borderWidth + msgPtr->highlightWidth;
      /*
       * Compute acceptable bounds for the final aspect ratio.
       */
      aspect = msgPtr->aspect/10;
      if (aspect < 5) {
          aspect = 5;
      }
      lowerBound = msgPtr->aspect - aspect;
      upperBound = msgPtr->aspect + aspect;
      /*
       * Do the computation in multiple passes:  start off with
       * a very wide window, and compute its height.  Then change
       * the width and try again.  Reduce the size of the change
       * and iterate until dimensions are found that approximate
       * the desired aspect ratio.  Or, if the user gave an explicit
       * width then just use that.
       */
      if (msgPtr->width > 0) {
          width = msgPtr->width;
          inc = 0;
      } else {
          width = WidthOfScreen(Tk_Screen(msgPtr->tkwin))/2;
          inc = width/2;
      }
      for ( ; ; inc /= 2) {
          msgPtr->textLayout = Tk_ComputeTextLayout(msgPtr->tkfont,
                  msgPtr->string, msgPtr->numChars, width, msgPtr->justify,
 , &thisWidth, &thisHeight);
          maxWidth = thisWidth + 2 * (inset + msgPtr->padX);
          height = thisHeight + 2 * (inset + msgPtr->padY);
          if (inc <= 2) {
              break;
          }
          aspect = (100 * maxWidth) / height;
          if (aspect < lowerBound) {
              width += inc;
          } else if (aspect > upperBound) {
              width -= inc;
          } else {
              break;
          }
          Tk_FreeTextLayout(msgPtr->textLayout);
      }
      msgPtr->msgWidth = thisWidth;
      msgPtr->msgHeight = thisHeight;
      Tk_GeometryRequest(msgPtr->tkwin, maxWidth, height);
      Tk_SetInternalBorder(msgPtr->tkwin, inset);
  }
  /*
   *--------------------------------------------------------------
   *
   * DisplayMessage --
   *
   *      This procedure redraws the contents of a message window.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Information appears on the screen.
   *
   *--------------------------------------------------------------
   */
  static void
  DisplayMessage(clientData)
      ClientData clientData;      /* Information about window. */
  {
      register Message *msgPtr = (Message *) clientData;
      register Tk_Window tkwin = msgPtr->tkwin;
      int x, y;
      int borderWidth = msgPtr->highlightWidth;
      msgPtr->flags &= ~REDRAW_PENDING;
      if ((msgPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
          return;
      }
      if (msgPtr->border != NULL) {
          borderWidth += msgPtr->borderWidth;
      }
      if (msgPtr->relief == TK_RELIEF_FLAT) {
          borderWidth = msgPtr->highlightWidth;
      }
      Tk_Fill3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border,
              borderWidth, borderWidth,
              Tk_Width(tkwin) - 2 * borderWidth,
              Tk_Height(tkwin) - 2 * borderWidth,
 , TK_RELIEF_FLAT);
      /*
       * Compute starting y-location for message based on message size
       * and anchor option.
       */
      TkComputeAnchor(msgPtr->anchor, tkwin, msgPtr->padX, msgPtr->padY,
              msgPtr->msgWidth, msgPtr->msgHeight, &x, &y);
      Tk_DrawTextLayout(Tk_Display(tkwin), Tk_WindowId(tkwin), msgPtr->textGC,
              msgPtr->textLayout, x, y, 0, -1);
      if (borderWidth > msgPtr->highlightWidth) {
          Tk_Draw3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border,
                  msgPtr->highlightWidth, msgPtr->highlightWidth,
                  Tk_Width(tkwin) - 2*msgPtr->highlightWidth,
                  Tk_Height(tkwin) - 2*msgPtr->highlightWidth,
                  msgPtr->borderWidth, msgPtr->relief);
      }
      if (msgPtr->highlightWidth != 0) {
          GC fgGC, bgGC;
          bgGC = Tk_GCForColor(msgPtr->highlightBgColorPtr, Tk_WindowId(tkwin));
          if (msgPtr->flags & GOT_FOCUS) {
              fgGC = Tk_GCForColor(msgPtr->highlightColorPtr, Tk_WindowId(tkwin));
              TkpDrawHighlightBorder(tkwin, fgGC, bgGC, msgPtr->highlightWidth,
                      Tk_WindowId(tkwin));
          } else {
              TkpDrawHighlightBorder(tkwin, bgGC, bgGC, msgPtr->highlightWidth,
                      Tk_WindowId(tkwin));
          }
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * MessageEventProc --
   *
   *      This procedure is invoked by the Tk dispatcher for various
   *      events on messages.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      When the window gets deleted, internal structures get
   *      cleaned up.  When it gets exposed, it is redisplayed.
   *
   *--------------------------------------------------------------
   */
  static void
  MessageEventProc(clientData, eventPtr)
      ClientData clientData;      /* Information about window. */
      XEvent *eventPtr;           /* Information about event. */
  {
      Message *msgPtr = (Message *) clientData;
      if (((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0))
              || (eventPtr->type == ConfigureNotify)) {
          goto redraw;
      } else if (eventPtr->type == DestroyNotify) {
          if (msgPtr->tkwin != NULL) {
              msgPtr->tkwin = NULL;
              Tcl_DeleteCommandFromToken(msgPtr->interp, msgPtr->widgetCmd);
          }
          if (msgPtr->flags & REDRAW_PENDING) {
              Tcl_CancelIdleCall(DisplayMessage, (ClientData) msgPtr);
          }
          Tcl_EventuallyFree((ClientData) msgPtr, DestroyMessage);
      } else if (eventPtr->type == FocusIn) {
          if (eventPtr->xfocus.detail != NotifyInferior) {
              msgPtr->flags |= GOT_FOCUS;
              if (msgPtr->highlightWidth > 0) {
                  goto redraw;
              }
          }
      } else if (eventPtr->type == FocusOut) {
          if (eventPtr->xfocus.detail != NotifyInferior) {
              msgPtr->flags &= ~GOT_FOCUS;
              if (msgPtr->highlightWidth > 0) {
                  goto redraw;
              }
          }
      }
      return;
      redraw:
      if ((msgPtr->tkwin != NULL) && !(msgPtr->flags & REDRAW_PENDING)) {
          Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
          msgPtr->flags |= REDRAW_PENDING;
      }
  }
  /*
   *----------------------------------------------------------------------
   *
   * MessageCmdDeletedProc --
   *
   *      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
  MessageCmdDeletedProc(clientData)
      ClientData clientData;      /* Pointer to widget record for widget. */
  {
      Message *msgPtr = (Message *) clientData;
      Tk_Window tkwin = msgPtr->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) {
          msgPtr->tkwin = NULL;
          Tk_DestroyWindow(tkwin);
      }
  }
  /*
   *--------------------------------------------------------------
   *
   * MessageTextVarProc --
   *
   *      This procedure is invoked when someone changes the variable
   *      whose contents are to be displayed in a message.
   *
   * Results:
   *      NULL is always returned.
   *
   * Side effects:
   *      The text displayed in the message will change to match the
   *      variable.
   *
   *--------------------------------------------------------------
   */
          /* ARGSUSED */
  static char *
  MessageTextVarProc(clientData, interp, name1, name2, flags)
      ClientData clientData;      /* Information about message. */
      Tcl_Interp *interp;         /* Interpreter containing variable. */
      char *name1;                /* Name of variable. */
      char *name2;                /* Second part of variable name. */
      int flags;                  /* Information about what happened. */
  {
      register Message *msgPtr = (Message *) clientData;
      char *value;
      /*
       * If the variable is unset, then immediately recreate it unless
       * the whole interpreter is going away.
       */
      if (flags & TCL_TRACE_UNSETS) {
          if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
              Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string,
                      TCL_GLOBAL_ONLY);
              Tcl_TraceVar(interp, msgPtr->textVarName,
                      TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                      MessageTextVarProc, clientData);
          }
          return (char *) NULL;
      }
      value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY);
      if (value == NULL) {
          value = "";
      }
      if (msgPtr->string != NULL) {
          ckfree(msgPtr->string);
      }
      msgPtr->numChars = Tcl_NumUtfChars(value, -1);
      msgPtr->string = (char *) ckalloc((unsigned) (strlen(value) + 1));
      strcpy(msgPtr->string, value);
      ComputeMessageGeometry(msgPtr);
      if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin)
              && !(msgPtr->flags & REDRAW_PENDING)) {
          Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
          msgPtr->flags |= REDRAW_PENDING;
      }
      return (char *) NULL;
  }
  /* End of tkmessage.c */

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