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[/] [or1k/] [tags/] [start/] [insight/] [tk/] [generic/] [tkEntry.c] - Blame information for rev 1780

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/*
 * tkEntry.c --
 *
 *      This module implements entry widgets for the Tk
 *      toolkit.  An entry displays a string and allows
 *      the string to be edited.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1996 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: tkEntry.c,v 1.1.1.1 2002-01-16 10:25:51 markom Exp $
 */
 
#include "tkInt.h"
#include "default.h"
 
/*
 * A data structure of the following type is kept for each entry
 * widget managed by this file:
 */
 
typedef struct {
    Tk_Window tkwin;            /* Window that embodies the entry. 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 entry. */
    Tcl_Command widgetCmd;      /* Token for entry's widget command. */
 
    /*
     * Fields that are set by widget commands other than "configure".
     */
 
    char *string;               /* Pointer to storage for string;
                                 * NULL-terminated;  malloc-ed. */
    int insertPos;              /* Index of character before which next
                                 * typed character will be inserted. */
 
    /*
     * Information about what's selected, if any.
     */
 
    int selectFirst;            /* Index of first selected character (-1 means
                                 * nothing selected. */
    int selectLast;             /* Index of last selected character (-1 means
                                 * nothing selected. */
    int selectAnchor;           /* Fixed end of selection (i.e. "select to"
                                 * operation will use this as one end of the
                                 * selection). */
 
    /*
     * Information for scanning:
     */
 
    int scanMarkX;              /* X-position at which scan started (e.g.
                                 * button was pressed here). */
    int scanMarkIndex;          /* Index of character that was at left of
                                 * window when scan started. */
 
    /*
     * Configuration settings that are updated by Tk_ConfigureWidget.
     */
 
    Tk_3DBorder normalBorder;   /* Used for drawing border around whole
                                 * window, plus used for background. */
    int borderWidth;            /* Width of 3-D border around window. */
    Tk_Cursor cursor;           /* Current cursor for window, or None. */
    int exportSelection;        /* Non-zero means tie internal entry selection
                                 * to X selection. */
    Tk_Font tkfont;             /* Information about text font, or NULL. */
    XColor *fgColorPtr;         /* Text color in normal mode. */
    XColor *highlightBgColorPtr;/* Color for drawing traversal highlight
                                 * area when highlight is off. */
    XColor *highlightColorPtr;  /* Color for drawing traversal highlight. */
    int highlightWidth;         /* Width in pixels of highlight to draw
                                 * around widget when it has the focus.
                                 * <= 0 means don't draw a highlight. */
    Tk_3DBorder insertBorder;   /* Used to draw vertical bar for insertion
                                 * cursor. */
    int insertBorderWidth;      /* Width of 3-D border around insert cursor. */
    int insertOffTime;          /* Number of milliseconds cursor should spend
                                 * in "off" state for each blink. */
    int insertOnTime;           /* Number of milliseconds cursor should spend
                                 * in "on" state for each blink. */
    int insertWidth;            /* Total width of insert cursor. */
    Tk_Justify justify;         /* Justification to use for text within
                                 * window. */
    int relief;                 /* 3-D effect: TK_RELIEF_RAISED, etc. */
    Tk_3DBorder selBorder;      /* Border and background for selected
                                 * characters. */
    int selBorderWidth;         /* Width of border around selection. */
    XColor *selFgColorPtr;      /* Foreground color for selected text. */
    char *showChar;             /* Value of -show option.  If non-NULL, first
                                 * character is used for displaying all
                                 * characters in entry.  Malloc'ed. */
    Tk_Uid state;               /* Normal or disabled.  Entry is read-only
                                 * when disabled. */
    char *textVarName;          /* Name of variable (malloc'ed) or NULL.
                                 * If non-NULL, entry's string tracks the
                                 * contents of this variable and vice versa. */
    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 prefWidth;              /* Desired width of window, measured in
                                 * average characters. */
    char *scrollCmd;            /* Command prefix for communicating with
                                 * scrollbar(s).  Malloc'ed.  NULL means
                                 * no command to issue. */
 
    /*
     * Fields whose values are derived from the current values of the
     * configuration settings above.
     */
 
    int numChars;               /* Number of non-NULL characters in
                                 * string (may be 0). */
    char *displayString;        /* If non-NULL, points to string with same
                                 * length as string but whose characters
                                 * are all equal to showChar.  Malloc'ed. */
    int inset;                  /* Number of pixels on the left and right
                                 * sides that are taken up by XPAD, borderWidth
                                 * (if any), and highlightWidth (if any). */
    Tk_TextLayout textLayout;   /* Cached text layout information. */
    int layoutX, layoutY;       /* Origin for layout. */
    int leftIndex;              /* Index of left-most character visible in
                                 * window. */
    int leftX;                  /* X position at which character at leftIndex
                                 * is drawn (varies depending on justify). */
    Tcl_TimerToken insertBlinkHandler;
                                /* Timer handler used to blink cursor on and
                                 * off. */
    GC textGC;                  /* For drawing normal text. */
    GC selTextGC;               /* For drawing selected text. */
    GC highlightGC;             /* For drawing traversal highlight. */
    int avgWidth;               /* Width of average character. */
    int flags;                  /* Miscellaneous flags;  see below for
                                 * definitions. */
} Entry;
 
/*
 * Assigned bits of "flags" fields of Entry structures, and what those
 * bits mean:
 *
 * REDRAW_PENDING:              Non-zero means a DoWhenIdle handler has
 *                              already been queued to redisplay the entry.
 * BORDER_NEEDED:               Non-zero means 3-D border must be redrawn
 *                              around window during redisplay.  Normally
 *                              only text portion needs to be redrawn.
 * CURSOR_ON:                   Non-zero means insert cursor is displayed at
 *                              present.  0 means it isn't displayed.
 * GOT_FOCUS:                   Non-zero means this window has the input
 *                              focus.
 * UPDATE_SCROLLBAR:            Non-zero means scrollbar should be updated
 *                              during next redisplay operation.
 * GOT_SELECTION:               Non-zero means we've claimed the selection.
 */
 
#define REDRAW_PENDING          1
#define BORDER_NEEDED           2
#define CURSOR_ON               4
#define GOT_FOCUS               8
#define UPDATE_SCROLLBAR        0x10
#define GOT_SELECTION           0x20
 
/*
 * The following macro defines how many extra pixels to leave on each
 * side of the text in the entry.
 */
 
#define XPAD 1
#define YPAD 1
 
/*
 * Information used for argv parsing.
 */
 
static Tk_ConfigSpec configSpecs[] = {
    {TK_CONFIG_BORDER, "-background", "background", "Background",
        DEF_ENTRY_BG_COLOR, Tk_Offset(Entry, normalBorder),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
        DEF_ENTRY_BG_MONO, Tk_Offset(Entry, normalBorder),
        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_ENTRY_BORDER_WIDTH, Tk_Offset(Entry, borderWidth), 0},
    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
        DEF_ENTRY_CURSOR, Tk_Offset(Entry, cursor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_BOOLEAN, "-exportselection", "exportSelection",
        "ExportSelection", DEF_ENTRY_EXPORT_SELECTION,
        Tk_Offset(Entry, exportSelection), 0},
    {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
        (char *) NULL, 0, 0},
    {TK_CONFIG_FONT, "-font", "font", "Font",
        DEF_ENTRY_FONT, Tk_Offset(Entry, tkfont), 0},
    {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
        DEF_ENTRY_FG, Tk_Offset(Entry, fgColorPtr), 0},
    {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
        "HighlightBackground", DEF_ENTRY_HIGHLIGHT_BG,
        Tk_Offset(Entry, highlightBgColorPtr), 0},
    {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
        DEF_ENTRY_HIGHLIGHT, Tk_Offset(Entry, highlightColorPtr), 0},
    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
        "HighlightThickness",
        DEF_ENTRY_HIGHLIGHT_WIDTH, Tk_Offset(Entry, highlightWidth), 0},
    {TK_CONFIG_BORDER, "-insertbackground", "insertBackground", "Foreground",
        DEF_ENTRY_INSERT_BG, Tk_Offset(Entry, insertBorder), 0},
    {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
        DEF_ENTRY_INSERT_BD_COLOR, Tk_Offset(Entry, insertBorderWidth),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
        DEF_ENTRY_INSERT_BD_MONO, Tk_Offset(Entry, insertBorderWidth),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_INT, "-insertofftime", "insertOffTime", "OffTime",
        DEF_ENTRY_INSERT_OFF_TIME, Tk_Offset(Entry, insertOffTime), 0},
    {TK_CONFIG_INT, "-insertontime", "insertOnTime", "OnTime",
        DEF_ENTRY_INSERT_ON_TIME, Tk_Offset(Entry, insertOnTime), 0},
    {TK_CONFIG_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
        DEF_ENTRY_INSERT_WIDTH, Tk_Offset(Entry, insertWidth), 0},
    {TK_CONFIG_JUSTIFY, "-justify", "justify", "Justify",
        DEF_ENTRY_JUSTIFY, Tk_Offset(Entry, justify), 0},
    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
        DEF_ENTRY_RELIEF, Tk_Offset(Entry, relief), 0},
    {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
        DEF_ENTRY_SELECT_COLOR, Tk_Offset(Entry, selBorder),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
        DEF_ENTRY_SELECT_MONO, Tk_Offset(Entry, selBorder),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
        DEF_ENTRY_SELECT_BD_COLOR, Tk_Offset(Entry, selBorderWidth),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
        DEF_ENTRY_SELECT_BD_MONO, Tk_Offset(Entry, selBorderWidth),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
        DEF_ENTRY_SELECT_FG_COLOR, Tk_Offset(Entry, selFgColorPtr),
        TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
        DEF_ENTRY_SELECT_FG_MONO, Tk_Offset(Entry, selFgColorPtr),
        TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_STRING, "-show", "show", "Show",
        DEF_ENTRY_SHOW, Tk_Offset(Entry, showChar), TK_CONFIG_NULL_OK},
    {TK_CONFIG_UID, "-state", "state", "State",
        DEF_ENTRY_STATE, Tk_Offset(Entry, state), 0},
    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
        DEF_ENTRY_TAKE_FOCUS, Tk_Offset(Entry, takeFocus), TK_CONFIG_NULL_OK},
    {TK_CONFIG_STRING, "-textvariable", "textVariable", "Variable",
        DEF_ENTRY_TEXT_VARIABLE, Tk_Offset(Entry, textVarName),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_INT, "-width", "width", "Width",
        DEF_ENTRY_WIDTH, Tk_Offset(Entry, prefWidth), 0},
    {TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
        DEF_ENTRY_SCROLL_COMMAND, Tk_Offset(Entry, scrollCmd),
        TK_CONFIG_NULL_OK},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
        (char *) NULL, 0, 0}
};
 
/*
 * Flags for GetEntryIndex procedure:
 */
 
#define ZERO_OK                 1
#define LAST_PLUS_ONE_OK        2
 
/*
 * Forward declarations for procedures defined later in this file:
 */
 
static int              ConfigureEntry _ANSI_ARGS_((Tcl_Interp *interp,
                            Entry *entryPtr, int argc, char **argv,
                            int flags));
static void             DeleteChars _ANSI_ARGS_((Entry *entryPtr, int index,
                            int count));
static void             DestroyEntry _ANSI_ARGS_((char *memPtr));
static void             DisplayEntry _ANSI_ARGS_((ClientData clientData));
static void             EntryBlinkProc _ANSI_ARGS_((ClientData clientData));
static void             EntryCmdDeletedProc _ANSI_ARGS_((
                            ClientData clientData));
static void             EntryComputeGeometry _ANSI_ARGS_((Entry *entryPtr));
static void             EntryEventProc _ANSI_ARGS_((ClientData clientData,
                            XEvent *eventPtr));
static void             EntryFocusProc _ANSI_ARGS_ ((Entry *entryPtr,
                            int gotFocus));
static int              EntryFetchSelection _ANSI_ARGS_((ClientData clientData,
                            int offset, char *buffer, int maxBytes));
static void             EntryLostSelection _ANSI_ARGS_((
                            ClientData clientData));
static void             EventuallyRedraw _ANSI_ARGS_((Entry *entryPtr));
static void             EntryScanTo _ANSI_ARGS_((Entry *entryPtr, int y));
static void             EntrySetValue _ANSI_ARGS_((Entry *entryPtr,
                            char *value));
static void             EntrySelectTo _ANSI_ARGS_((
                            Entry *entryPtr, int index));
static char *           EntryTextVarProc _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, char *name1, char *name2,
                            int flags));
static void             EntryUpdateScrollbar _ANSI_ARGS_((Entry *entryPtr));
static void             EntryValueChanged _ANSI_ARGS_((Entry *entryPtr));
static void             EntryVisibleRange _ANSI_ARGS_((Entry *entryPtr,
                            double *firstPtr, double *lastPtr));
static int              EntryWidgetCmd _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, int argc, char **argv));
static void             EntryWorldChanged _ANSI_ARGS_((
                            ClientData instanceData));
static int              GetEntryIndex _ANSI_ARGS_((Tcl_Interp *interp,
                            Entry *entryPtr, char *string, int *indexPtr));
static void             InsertChars _ANSI_ARGS_((Entry *entryPtr, int index,
                            char *string));
 
/*
 * The structure below defines entry class behavior by means of procedures
 * that can be invoked from generic window code.
 */
 
static TkClassProcs entryClass = {
    NULL,                       /* createProc. */
    EntryWorldChanged,          /* geometryProc. */
    NULL                        /* modalProc. */
};
 
 
/*
 *--------------------------------------------------------------
 *
 * Tk_EntryCmd --
 *
 *      This procedure is invoked to process the "entry" 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_EntryCmd(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 Entry *entryPtr;
    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;
    }
 
    /*
     * Initialize the fields of the structure that won't be initialized
     * by ConfigureEntry, or that ConfigureEntry requires to be
     * initialized already (e.g. resource pointers).
     */
 
    entryPtr = (Entry *) ckalloc(sizeof(Entry));
    entryPtr->tkwin = new;
    entryPtr->display = Tk_Display(new);
    entryPtr->interp = interp;
    entryPtr->widgetCmd = Tcl_CreateCommand(interp,
            Tk_PathName(entryPtr->tkwin), EntryWidgetCmd,
            (ClientData) entryPtr, EntryCmdDeletedProc);
    entryPtr->string = (char *) ckalloc(1);
    entryPtr->string[0] = '\0';
    entryPtr->insertPos = 0;
    entryPtr->selectFirst = -1;
    entryPtr->selectLast = -1;
    entryPtr->selectAnchor = 0;
    entryPtr->scanMarkX = 0;
    entryPtr->scanMarkIndex = 0;
 
    entryPtr->normalBorder = NULL;
    entryPtr->borderWidth = 0;
    entryPtr->cursor = None;
    entryPtr->exportSelection = 1;
    entryPtr->tkfont = NULL;
    entryPtr->fgColorPtr = NULL;
    entryPtr->highlightBgColorPtr = NULL;
    entryPtr->highlightColorPtr = NULL;
    entryPtr->highlightWidth = 0;
    entryPtr->insertBorder = NULL;
    entryPtr->insertBorderWidth = 0;
    entryPtr->insertOffTime = 0;
    entryPtr->insertOnTime = 0;
    entryPtr->insertWidth = 0;
    entryPtr->justify = TK_JUSTIFY_LEFT;
    entryPtr->relief = TK_RELIEF_FLAT;
    entryPtr->selBorder = NULL;
    entryPtr->selBorderWidth = 0;
    entryPtr->selFgColorPtr = NULL;
    entryPtr->showChar = NULL;
    entryPtr->state = tkNormalUid;
    entryPtr->textVarName = NULL;
    entryPtr->takeFocus = NULL;
    entryPtr->prefWidth = 0;
    entryPtr->scrollCmd = NULL;
 
    entryPtr->numChars = 0;
    entryPtr->displayString = NULL;
    entryPtr->inset = XPAD;
    entryPtr->textLayout = NULL;
    entryPtr->layoutX = 0;
    entryPtr->layoutY = 0;
    entryPtr->leftIndex = 0;
    entryPtr->leftX = 0;
    entryPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
    entryPtr->textGC = None;
    entryPtr->selTextGC = None;
    entryPtr->highlightGC = None;
    entryPtr->avgWidth = 1;
    entryPtr->flags = 0;
 
    Tk_SetClass(entryPtr->tkwin, "Entry");
    TkSetClassProcs(entryPtr->tkwin, &entryClass, (ClientData) entryPtr);
    Tk_CreateEventHandler(entryPtr->tkwin,
            ExposureMask|StructureNotifyMask|FocusChangeMask,
            EntryEventProc, (ClientData) entryPtr);
    Tk_CreateSelHandler(entryPtr->tkwin, XA_PRIMARY, XA_STRING,
            EntryFetchSelection, (ClientData) entryPtr, XA_STRING);
    if (ConfigureEntry(interp, entryPtr, argc-2, argv+2, 0) != TCL_OK) {
        goto error;
    }
 
    interp->result = Tk_PathName(entryPtr->tkwin);
    return TCL_OK;
 
    error:
    Tk_DestroyWindow(entryPtr->tkwin);
    return TCL_ERROR;
}
 
/*
 *--------------------------------------------------------------
 *
 * EntryWidgetCmd --
 *
 *      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
EntryWidgetCmd(clientData, interp, argc, argv)
    ClientData clientData;              /* Information about entry widget. */
    Tcl_Interp *interp;                 /* Current interpreter. */
    int argc;                           /* Number of arguments. */
    char **argv;                        /* Argument strings. */
{
    register Entry *entryPtr = (Entry *) 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) entryPtr);
    c = argv[1][0];
    length = strlen(argv[1]);
    if ((c == 'b') && (strncmp(argv[1], "bbox", length) == 0)) {
        int index;
        int x, y, width, height;
 
        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " bbox index\"",
                    (char *) NULL);
            goto error;
        }
        if (GetEntryIndex(interp, entryPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if ((index == entryPtr->numChars) && (index > 0)) {
            index--;
        }
        Tk_CharBbox(entryPtr->textLayout, index, &x, &y, &width, &height);
        sprintf(interp->result, "%d %d %d %d",
                x + entryPtr->layoutX, y + entryPtr->layoutY, width, height);
    } 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, entryPtr->tkwin, configSpecs,
                (char *) entryPtr, argv[2], 0);
    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
            && (length >= 2)) {
        if (argc == 2) {
            result = Tk_ConfigureInfo(interp, entryPtr->tkwin, configSpecs,
                    (char *) entryPtr, (char *) NULL, 0);
        } else if (argc == 3) {
            result = Tk_ConfigureInfo(interp, entryPtr->tkwin, configSpecs,
                    (char *) entryPtr, argv[2], 0);
        } else {
            result = ConfigureEntry(interp, entryPtr, argc-2, argv+2,
                    TK_CONFIG_ARGV_ONLY);
        }
    } else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)) {
        int first, last;
 
        if ((argc < 3) || (argc > 4)) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " delete firstIndex ?lastIndex?\"",
                    (char *) NULL);
            goto error;
        }
        if (GetEntryIndex(interp, entryPtr, argv[2], &first) != TCL_OK) {
            goto error;
        }
        if (argc == 3) {
            last = first+1;
        } else {
            if (GetEntryIndex(interp, entryPtr, argv[3], &last) != TCL_OK) {
                goto error;
            }
        }
        if ((last >= first) && (entryPtr->state == tkNormalUid)) {
            DeleteChars(entryPtr, first, last-first);
        }
    } 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;
        }
        interp->result = entryPtr->string;
    } else if ((c == 'i') && (strncmp(argv[1], "icursor", length) == 0)
            && (length >= 2)) {
        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " icursor pos\"",
                    (char *) NULL);
            goto error;
        }
        if (GetEntryIndex(interp, entryPtr, argv[2], &entryPtr->insertPos)
                != TCL_OK) {
            goto error;
        }
        EventuallyRedraw(entryPtr);
    } else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
            && (length >= 3)) {
        int index;
 
        if (argc != 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " index string\"", (char *) NULL);
            goto error;
        }
        if (GetEntryIndex(interp, entryPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        sprintf(interp->result, "%d", index);
    } else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)
            && (length >= 3)) {
        int index;
 
        if (argc != 4) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " insert index text\"",
                    (char *) NULL);
            goto error;
        }
        if (GetEntryIndex(interp, entryPtr, argv[2], &index) != TCL_OK) {
            goto error;
        }
        if (entryPtr->state == tkNormalUid) {
            InsertChars(entryPtr, index, argv[3]);
        }
    } else if ((c == 's') && (length >= 2)
            && (strncmp(argv[1], "scan", length) == 0)) {
        int x;
 
        if (argc != 4) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " scan mark|dragto x\"", (char *) NULL);
            goto error;
        }
        if (Tcl_GetInt(interp, argv[3], &x) != TCL_OK) {
            goto error;
        }
        if ((argv[2][0] == 'm')
                && (strncmp(argv[2], "mark", strlen(argv[2])) == 0)) {
            entryPtr->scanMarkX = x;
            entryPtr->scanMarkIndex = entryPtr->leftIndex;
        } else if ((argv[2][0] == 'd')
                && (strncmp(argv[2], "dragto", strlen(argv[2])) == 0)) {
            EntryScanTo(entryPtr, x);
        } else {
            Tcl_AppendResult(interp, "bad scan option \"", argv[2],
                    "\": must be mark or dragto", (char *) NULL);
            goto error;
        }
    } else if ((c == 's') && (length >= 2)
            && (strncmp(argv[1], "selection", length) == 0)) {
        int index, index2;
 
        if (argc < 3) {
            Tcl_AppendResult(interp, "wrong # args: should be \"",
                    argv[0], " select option ?index?\"", (char *) NULL);
            goto error;
        }
        length = strlen(argv[2]);
        c = argv[2][0];
        if ((c == 'c') && (strncmp(argv[2], "clear", length) == 0)) {
            if (argc != 3) {
                Tcl_AppendResult(interp, "wrong # args: should be \"",
                        argv[0], " selection clear\"", (char *) NULL);
                goto error;
            }
            if (entryPtr->selectFirst != -1) {
                entryPtr->selectFirst = entryPtr->selectLast = -1;
                EventuallyRedraw(entryPtr);
            }
            goto done;
        } else if ((c == 'p') && (strncmp(argv[2], "present", length) == 0)) {
            if (argc != 3) {
                Tcl_AppendResult(interp, "wrong # args: should be \"",
                        argv[0], " selection present\"", (char *) NULL);
                goto error;
            }
            if (entryPtr->selectFirst == -1) {
                interp->result = "0";
            } else {
                interp->result = "1";
            }
            goto done;
        }
        if (argc >= 4) {
            if (GetEntryIndex(interp, entryPtr, argv[3], &index) != TCL_OK) {
                goto error;
            }
        }
        if ((c == 'a') && (strncmp(argv[2], "adjust", length) == 0)) {
            if (argc != 4) {
                Tcl_AppendResult(interp, "wrong # args: should be \"",
                        argv[0], " selection adjust index\"",
                        (char *) NULL);
                goto error;
            }
            if (entryPtr->selectFirst >= 0) {
                int half1, half2;
 
                half1 = (entryPtr->selectFirst + entryPtr->selectLast)/2;
                half2 = (entryPtr->selectFirst + entryPtr->selectLast + 1)/2;
                if (index < half1) {
                    entryPtr->selectAnchor = entryPtr->selectLast;
                } else if (index > half2) {
                    entryPtr->selectAnchor = entryPtr->selectFirst;
                } else {
                    /*
                     * We're at about the halfway point in the selection;
                     * just keep the existing anchor.
                     */
                }
            }
            EntrySelectTo(entryPtr, index);
        } else if ((c == 'f') && (strncmp(argv[2], "from", length) == 0)) {
            if (argc != 4) {
                Tcl_AppendResult(interp, "wrong # args: should be \"",
                        argv[0], " selection from index\"",
                        (char *) NULL);
                goto error;
            }
            entryPtr->selectAnchor = index;
        } else if ((c == 'r') && (strncmp(argv[2], "range", length) == 0)) {
            if (argc != 5) {
                Tcl_AppendResult(interp, "wrong # args: should be \"",
                        argv[0], " selection range start end\"",
                        (char *) NULL);
                goto error;
            }
            if (GetEntryIndex(interp, entryPtr, argv[4], &index2) != TCL_OK) {
                goto error;
            }
            if (index >= index2) {
                entryPtr->selectFirst = entryPtr->selectLast = -1;
            } else {
                entryPtr->selectFirst = index;
                entryPtr->selectLast = index2;
            }
            if (!(entryPtr->flags & GOT_SELECTION)
                    && (entryPtr->exportSelection)) {
                Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY,
                        EntryLostSelection, (ClientData) entryPtr);
                entryPtr->flags |= GOT_SELECTION;
            }
            EventuallyRedraw(entryPtr);
        } else if ((c == 't') && (strncmp(argv[2], "to", length) == 0)) {
            if (argc != 4) {
                Tcl_AppendResult(interp, "wrong # args: should be \"",
                        argv[0], " selection to index\"",
                        (char *) NULL);
                goto error;
            }
            EntrySelectTo(entryPtr, index);
        } else {
            Tcl_AppendResult(interp, "bad selection option \"", argv[2],
                    "\": must be adjust, clear, from, present, range, or to",
                    (char *) NULL);
            goto error;
        }
    } else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
        int index, type, count, charsPerPage;
        double fraction, first, last;
 
        if (argc == 2) {
            EntryVisibleRange(entryPtr, &first, &last);
            sprintf(interp->result, "%g %g", first, last);
            goto done;
        } else if (argc == 3) {
            if (GetEntryIndex(interp, entryPtr, argv[2], &index) != TCL_OK) {
                goto error;
            }
        } else {
            type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
            index = entryPtr->leftIndex;
            switch (type) {
                case TK_SCROLL_ERROR:
                    goto error;
                case TK_SCROLL_MOVETO:
                    index = (int) ((fraction * entryPtr->numChars) + 0.5);
                    break;
                case TK_SCROLL_PAGES:
                    charsPerPage = ((Tk_Width(entryPtr->tkwin)
                            - 2*entryPtr->inset) / entryPtr->avgWidth) - 2;
                    if (charsPerPage < 1) {
                        charsPerPage = 1;
                    }
                    index += charsPerPage*count;
                    break;
                case TK_SCROLL_UNITS:
                    index += count;
                    break;
            }
        }
        if (index >= entryPtr->numChars) {
            index = entryPtr->numChars-1;
        }
        if (index < 0) {
            index = 0;
        }
        entryPtr->leftIndex = index;
        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        EventuallyRedraw(entryPtr);
    } else {
        Tcl_AppendResult(interp, "bad option \"", argv[1],
                "\": must be bbox, cget, configure, delete, get, ",
                "icursor, index, insert, scan, selection, or xview",
                (char *) NULL);
        goto error;
    }
    done:
    Tcl_Release((ClientData) entryPtr);
    return result;
 
    error:
    Tcl_Release((ClientData) entryPtr);
    return TCL_ERROR;
}
 
/*
 *----------------------------------------------------------------------
 *
 * DestroyEntry --
 *
 *      This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
 *      to clean up the internal structure of an entry at a safe time
 *      (when no-one is using it anymore).
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Everything associated with the entry is freed up.
 *
 *----------------------------------------------------------------------
 */
 
static void
DestroyEntry(memPtr)
    char *memPtr;               /* Info about entry widget. */
{
    register Entry *entryPtr = (Entry *) memPtr;
 
    /*
     * Free up all the stuff that requires special handling, then
     * let Tk_FreeOptions handle all the standard option-related
     * stuff.
     */
 
    ckfree(entryPtr->string);
    if (entryPtr->textVarName != NULL) {
        Tcl_UntraceVar(entryPtr->interp, entryPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, (ClientData) entryPtr);
    }
    if (entryPtr->textGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->textGC);
    }
    if (entryPtr->selTextGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->selTextGC);
    }
    Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler);
    if (entryPtr->displayString != NULL) {
        ckfree(entryPtr->displayString);
    }
    Tk_FreeTextLayout(entryPtr->textLayout);
    Tk_FreeOptions(configSpecs, (char *) entryPtr, entryPtr->display, 0);
    ckfree((char *) entryPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * ConfigureEntry --
 *
 *      This procedure is called to process an argv/argc list, plus
 *      the Tk option database, in order to configure (or reconfigure)
 *      an entry 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 entryPtr;  old resources get freed,
 *      if there were any.
 *
 *----------------------------------------------------------------------
 */
 
static int
ConfigureEntry(interp, entryPtr, argc, argv, flags)
    Tcl_Interp *interp;         /* Used for error reporting. */
    register Entry *entryPtr;   /* 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. */
{
    int oldExport;
 
    /*
     * Eliminate any existing trace on a variable monitored by the entry.
     */
 
    if (entryPtr->textVarName != NULL) {
        Tcl_UntraceVar(interp, entryPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, (ClientData) entryPtr);
    }
 
    oldExport = entryPtr->exportSelection;
    if (Tk_ConfigureWidget(interp, entryPtr->tkwin, configSpecs,
            argc, argv, (char *) entryPtr, flags) != TCL_OK) {
        return TCL_ERROR;
    }
 
    /*
     * If the entry is tied to the value of a variable, then set up
     * a trace on the variable's value, create the variable if it doesn't
     * exist, and set the entry's value from the variable's value.
     */
 
    if (entryPtr->textVarName != NULL) {
        char *value;
 
        value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY);
        if (value == NULL) {
            EntryValueChanged(entryPtr);
        } else {
            EntrySetValue(entryPtr, value);
        }
        Tcl_TraceVar(interp, entryPtr->textVarName,
                TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                EntryTextVarProc, (ClientData) entryPtr);
    }
 
    /*
     * A few other options also need special processing, such as parsing
     * the geometry and setting the background from a 3-D border.
     */
 
    if ((entryPtr->state != tkNormalUid)
            && (entryPtr->state != tkDisabledUid)) {
        Tcl_AppendResult(interp, "bad state value \"", entryPtr->state,
                "\": must be normal or disabled", (char *) NULL);
        entryPtr->state = tkNormalUid;
        return TCL_ERROR;
    }
 
    Tk_SetBackgroundFromBorder(entryPtr->tkwin, entryPtr->normalBorder);
 
    if (entryPtr->insertWidth <= 0) {
        entryPtr->insertWidth = 2;
    }
    if (entryPtr->insertBorderWidth > entryPtr->insertWidth/2) {
        entryPtr->insertBorderWidth = entryPtr->insertWidth/2;
    }
 
    /*
     * Restart the cursor timing sequence in case the on-time or off-time
     * just changed.
     */
 
    if (entryPtr->flags & GOT_FOCUS) {
        EntryFocusProc(entryPtr, 1);
    }
 
    /*
     * Claim the selection if we've suddenly started exporting it.
     */
 
    if (entryPtr->exportSelection && (!oldExport)
            && (entryPtr->selectFirst != -1)
            && !(entryPtr->flags & GOT_SELECTION)) {
        Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection,
                (ClientData) entryPtr);
        entryPtr->flags |= GOT_SELECTION;
    }
 
    /*
     * Recompute the window's geometry and arrange for it to be
     * redisplayed.
     */
 
    Tk_SetInternalBorder(entryPtr->tkwin,
            entryPtr->borderWidth + entryPtr->highlightWidth);
    if (entryPtr->highlightWidth <= 0) {
        entryPtr->highlightWidth = 0;
    }
    entryPtr->inset = entryPtr->highlightWidth + entryPtr->borderWidth + XPAD;
 
    EntryWorldChanged((ClientData) entryPtr);
    return TCL_OK;
}
 
/*
 *---------------------------------------------------------------------------
 *
 * EntryWorldChanged --
 *
 *      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:
 *      Entry will be relayed out and redisplayed.
 *
 *---------------------------------------------------------------------------
 */
 
static void
EntryWorldChanged(instanceData)
    ClientData instanceData;    /* Information about widget. */
{
    XGCValues gcValues;
    GC gc;
    unsigned long mask;
    Entry *entryPtr;
 
    entryPtr = (Entry *) instanceData;
 
    entryPtr->avgWidth = Tk_TextWidth(entryPtr->tkfont, "0", 1);
    if (entryPtr->avgWidth == 0) {
        entryPtr->avgWidth = 1;
    }
 
    gcValues.foreground = entryPtr->fgColorPtr->pixel;
    gcValues.font = Tk_FontId(entryPtr->tkfont);
    gcValues.graphics_exposures = False;
    mask = GCForeground | GCFont | GCGraphicsExposures;
    gc = Tk_GetGCColor(entryPtr->tkwin, mask, &gcValues, entryPtr->fgColorPtr,
                       NULL);
    if (entryPtr->textGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->textGC);
    }
    entryPtr->textGC = gc;
 
    gcValues.foreground = entryPtr->selFgColorPtr->pixel;
    gcValues.font = Tk_FontId(entryPtr->tkfont);
    mask = GCForeground | GCFont;
    gc = Tk_GetGCColor(entryPtr->tkwin, mask, &gcValues,
                       entryPtr->selFgColorPtr, NULL);
    if (entryPtr->selTextGC != None) {
        Tk_FreeGC(entryPtr->display, entryPtr->selTextGC);
    }
    entryPtr->selTextGC = gc;
 
    /*
     * Recompute the window's geometry and arrange for it to be
     * redisplayed.
     */
 
    EntryComputeGeometry(entryPtr);
    entryPtr->flags |= UPDATE_SCROLLBAR;
    EventuallyRedraw(entryPtr);
}
 
/*
 *--------------------------------------------------------------
 *
 * DisplayEntry --
 *
 *      This procedure redraws the contents of an entry window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Information appears on the screen.
 *
 *--------------------------------------------------------------
 */
 
static void
DisplayEntry(clientData)
    ClientData clientData;      /* Information about window. */
{
    register Entry *entryPtr = (Entry *) clientData;
    register Tk_Window tkwin = entryPtr->tkwin;
    int baseY, selStartX, selEndX, cursorX, x, w;
    int xBound;
    Tk_FontMetrics fm;
    Pixmap pixmap;
    int showSelection;
 
    entryPtr->flags &= ~REDRAW_PENDING;
    if ((entryPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
        return;
    }
 
    Tk_GetFontMetrics(entryPtr->tkfont, &fm);
 
    /*
     * Update the scrollbar if that's needed.
     */
 
    if (entryPtr->flags & UPDATE_SCROLLBAR) {
        entryPtr->flags &= ~UPDATE_SCROLLBAR;
        EntryUpdateScrollbar(entryPtr);
    }
 
    /*
     * In order to avoid screen flashes, this procedure redraws the
     * textual area of the entry into off-screen memory, then copies
     * it back on-screen in a single operation.  This means there's
     * no point in time where the on-screen image has been cleared.
     */
 
    pixmap = Tk_GetPixmap(entryPtr->display, Tk_WindowId(tkwin),
            Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
 
    /*
     * Compute x-coordinate of the pixel just after last visible
     * one, plus vertical position of baseline of text.
     */
 
    xBound = Tk_Width(tkwin) - entryPtr->inset;
    baseY = (Tk_Height(tkwin) + fm.ascent - fm.descent) / 2;
 
    /*
     * On Windows and Mac, we need to hide the selection whenever we
     * don't have the focus.
     */
 
#ifdef ALWAYS_SHOW_SELECTION
    showSelection = 1;
#else
    showSelection = (entryPtr->flags & GOT_FOCUS);
#endif
 
    /*
     * Draw the background in three layers.  From bottom to top the
     * layers are:  normal background, selection background, and
     * insertion cursor background.
     */
 
    Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->normalBorder,
            0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);
    if (showSelection && (entryPtr->selectLast > entryPtr->leftIndex)) {
        if (entryPtr->selectFirst <= entryPtr->leftIndex) {
            selStartX = entryPtr->leftX;
        } else {
            Tk_CharBbox(entryPtr->textLayout, entryPtr->selectFirst,
                    &x, NULL, NULL, NULL);
            selStartX = x + entryPtr->layoutX;
        }
        if ((selStartX - entryPtr->selBorderWidth) < xBound) {
            Tk_CharBbox(entryPtr->textLayout, entryPtr->selectLast - 1,
                    &x, NULL, &w, NULL);
            selEndX = x + w + entryPtr->layoutX;
            Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->selBorder,
                    selStartX - entryPtr->selBorderWidth,
                    baseY - fm.ascent - entryPtr->selBorderWidth,
                    (selEndX - selStartX) + 2*entryPtr->selBorderWidth,
                    (fm.ascent + fm.descent) + 2*entryPtr->selBorderWidth,
                    entryPtr->selBorderWidth, TK_RELIEF_RAISED);
        }
    }
 
    /*
     * Draw a special background for the insertion cursor, overriding
     * even the selection background.  As a special hack to keep the
     * cursor visible when the insertion cursor color is the same as
     * the color for selected text (e.g., on mono displays), write
     * background in the cursor area (instead of nothing) when the
     * cursor isn't on.  Otherwise the selection would hide the cursor.
     */
 
    if ((entryPtr->insertPos >= entryPtr->leftIndex)
            && (entryPtr->state == tkNormalUid)
            && (entryPtr->flags & GOT_FOCUS)) {
        if (entryPtr->insertPos == 0) {
            cursorX = 0;
        } else if (entryPtr->insertPos >= entryPtr->numChars) {
            int idx = entryPtr->numChars >= 1 ? entryPtr->numChars - 1 : 0;
            Tk_CharBbox(entryPtr->textLayout, idx,
                    &x, NULL, &w, NULL);
            cursorX = x + w;
        } else {
            Tk_CharBbox(entryPtr->textLayout, entryPtr->insertPos,
                    &x, NULL, NULL, NULL);
            cursorX = x;
        }
        cursorX += entryPtr->layoutX;
        cursorX -= (entryPtr->insertWidth)/2;
        if (cursorX < xBound) {
            if (entryPtr->flags & CURSOR_ON) {
                Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->insertBorder,
                        cursorX, baseY - fm.ascent,
                        entryPtr->insertWidth, fm.ascent + fm.descent,
                        entryPtr->insertBorderWidth, TK_RELIEF_RAISED);
            } else if (entryPtr->insertBorder == entryPtr->selBorder) {
                Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->normalBorder,
                        cursorX, baseY - fm.ascent,
                        entryPtr->insertWidth, fm.ascent + fm.descent,
                        0, TK_RELIEF_FLAT);
            }
        }
    }
 
    /*
     * Draw the text in two pieces:  first the unselected portion, then the
     * selected portion on top of it.
     */
 
    Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->textGC,
            entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY,
            entryPtr->leftIndex, entryPtr->numChars);
 
    if (showSelection && (entryPtr->selTextGC != entryPtr->textGC) &&
            (entryPtr->selectFirst < entryPtr->selectLast)) {
        int first;
 
        if (entryPtr->selectFirst - entryPtr->leftIndex < 0) {
            first = entryPtr->leftIndex;
        } else {
            first = entryPtr->selectFirst;
        }
        Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->selTextGC,
                entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY,
                first, entryPtr->selectLast);
    }
 
    /*
     * Draw the border and focus highlight last, so they will overwrite
     * any text that extends past the viewable part of the window.
     */
 
    if (entryPtr->relief != TK_RELIEF_FLAT) {
        Tk_Draw3DRectangle(tkwin, pixmap, entryPtr->normalBorder,
                entryPtr->highlightWidth, entryPtr->highlightWidth,
                Tk_Width(tkwin) - 2*entryPtr->highlightWidth,
                Tk_Height(tkwin) - 2*entryPtr->highlightWidth,
                entryPtr->borderWidth, entryPtr->relief);
    }
    if (entryPtr->highlightWidth != 0) {
        GC gc;
 
        if (entryPtr->flags & GOT_FOCUS) {
            gc = Tk_GCForColor(entryPtr->highlightColorPtr, pixmap);
        } else {
            gc = Tk_GCForColor(entryPtr->highlightBgColorPtr, pixmap);
        }
        Tk_DrawFocusHighlight(tkwin, gc, entryPtr->highlightWidth, pixmap);
    }
 
    /*
     * Everything's been redisplayed;  now copy the pixmap onto the screen
     * and free up the pixmap.
     */
 
    XCopyArea(entryPtr->display, pixmap, Tk_WindowId(tkwin), entryPtr->textGC,
            0, 0, (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin),
            0, 0);
    Tk_FreePixmap(entryPtr->display, pixmap);
    entryPtr->flags &= ~BORDER_NEEDED;
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryComputeGeometry --
 *
 *      This procedure is invoked to recompute information about where
 *      in its window an entry's string will be displayed.  It also
 *      computes the requested size for the window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The leftX and tabOrigin fields are recomputed for entryPtr,
 *      and leftIndex may be adjusted.  Tk_GeometryRequest is called
 *      to register the desired dimensions for the window.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryComputeGeometry(entryPtr)
    Entry *entryPtr;                    /* Widget record for entry. */
{
    int totalLength, overflow, maxOffScreen, rightX;
    int height, width, i;
    Tk_FontMetrics fm;
    char *p, *displayString;
 
    /*
     * If we're displaying a special character instead of the value of
     * the entry, recompute the displayString.
     */
 
    if (entryPtr->displayString != NULL) {
        ckfree(entryPtr->displayString);
        entryPtr->displayString = NULL;
    }
    if (entryPtr->showChar != NULL) {
        entryPtr->displayString = (char *) ckalloc((unsigned)
                (entryPtr->numChars + 1));
        for (p = entryPtr->displayString, i = entryPtr->numChars; i > 0;
                i--, p++) {
            *p = entryPtr->showChar[0];
        }
        *p = 0;
        displayString = entryPtr->displayString;
    } else {
        displayString = entryPtr->string;
    }
    Tk_FreeTextLayout(entryPtr->textLayout);
    entryPtr->textLayout = Tk_ComputeTextLayout(entryPtr->tkfont,
            displayString, entryPtr->numChars, 0, entryPtr->justify,
            TK_IGNORE_NEWLINES, &totalLength, &height);
 
    entryPtr->layoutY = (Tk_Height(entryPtr->tkwin) - height) / 2;
 
    /*
     * Recompute where the leftmost character on the display will
     * be drawn (entryPtr->leftX) and adjust leftIndex if necessary
     * so that we don't let characters hang off the edge of the
     * window unless the entire window is full.
     */
 
    overflow = totalLength - (Tk_Width(entryPtr->tkwin) - 2*entryPtr->inset);
    if (overflow <= 0) {
        entryPtr->leftIndex = 0;
        if (entryPtr->justify == TK_JUSTIFY_LEFT) {
            entryPtr->leftX = entryPtr->inset;
        } else if (entryPtr->justify == TK_JUSTIFY_RIGHT) {
            entryPtr->leftX = Tk_Width(entryPtr->tkwin) - entryPtr->inset
                    - totalLength;
        } else {
            entryPtr->leftX = (Tk_Width(entryPtr->tkwin) - totalLength)/2;
        }
        entryPtr->layoutX = entryPtr->leftX;
    } else {
        /*
         * The whole string can't fit in the window.  Compute the
         * maximum number of characters that may be off-screen to
         * the left without leaving empty space on the right of the
         * window, then don't let leftIndex be any greater than that.
         */
 
        maxOffScreen = Tk_PointToChar(entryPtr->textLayout, overflow, 0);
        Tk_CharBbox(entryPtr->textLayout, maxOffScreen,
                &rightX, NULL, NULL, NULL);
        if (rightX < overflow) {
            maxOffScreen += 1;
        }
        if (entryPtr->leftIndex > maxOffScreen) {
            entryPtr->leftIndex = maxOffScreen;
        }
        Tk_CharBbox(entryPtr->textLayout, entryPtr->leftIndex,
                &rightX, NULL, NULL, NULL);
        entryPtr->leftX = entryPtr->inset;
        entryPtr->layoutX = entryPtr->leftX - rightX;
    }
 
    Tk_GetFontMetrics(entryPtr->tkfont, &fm);
    height = fm.linespace + 2*entryPtr->inset + 2*(YPAD-XPAD);
    if (entryPtr->prefWidth > 0) {
        width = entryPtr->prefWidth*entryPtr->avgWidth + 2*entryPtr->inset;
    } else {
        if (totalLength == 0) {
            width = entryPtr->avgWidth + 2*entryPtr->inset;
        } else {
            width = totalLength + 2*entryPtr->inset;
        }
    }
    Tk_GeometryRequest(entryPtr->tkwin, width, height);
}
 
/*
 *----------------------------------------------------------------------
 *
 * InsertChars --
 *
 *      Add new characters to an entry widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      New information gets added to entryPtr;  it will be redisplayed
 *      soon, but not necessarily immediately.
 *
 *----------------------------------------------------------------------
 */
 
static void
InsertChars(entryPtr, index, string)
    register Entry *entryPtr;   /* Entry that is to get the new
                                 * elements. */
    int index;                  /* Add the new elements before this
                                 * element. */
    char *string;               /* New characters to add (NULL-terminated
                                 * string). */
{
    int length;
    char *new;
 
    length = strlen(string);
    if (length == 0) {
        return;
    }
    new = (char *) ckalloc((unsigned) (entryPtr->numChars + length + 1));
    strncpy(new, entryPtr->string, (size_t) index);
    strcpy(new+index, string);
    strcpy(new+index+length, entryPtr->string+index);
    ckfree(entryPtr->string);
    entryPtr->string = new;
    entryPtr->numChars += length;
 
    /*
     * Inserting characters invalidates all indexes into the string.
     * Touch up the indexes so that they still refer to the same
     * characters (at new positions).  When updating the selection
     * end-points, don't include the new text in the selection unless
     * it was completely surrounded by the selection.
     */
 
    if (entryPtr->selectFirst >= index) {
        entryPtr->selectFirst += length;
    }
    if (entryPtr->selectLast > index) {
        entryPtr->selectLast += length;
    }
    if ((entryPtr->selectAnchor > index) || (entryPtr->selectFirst >= index)) {
        entryPtr->selectAnchor += length;
    }
    if (entryPtr->leftIndex > index) {
        entryPtr->leftIndex += length;
    }
    if (entryPtr->insertPos >= index) {
        entryPtr->insertPos += length;
    }
    EntryValueChanged(entryPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * DeleteChars --
 *
 *      Remove one or more characters from an entry widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Memory gets freed, the entry gets modified and (eventually)
 *      redisplayed.
 *
 *----------------------------------------------------------------------
 */
 
static void
DeleteChars(entryPtr, index, count)
    register Entry *entryPtr;   /* Entry widget to modify. */
    int index;                  /* Index of first character to delete. */
    int count;                  /* How many characters to delete. */
{
    char *new;
 
    if ((index + count) > entryPtr->numChars) {
        count = entryPtr->numChars - index;
    }
    if (count <= 0) {
        return;
    }
 
    new = (char *) ckalloc((unsigned) (entryPtr->numChars + 1 - count));
    strncpy(new, entryPtr->string, (size_t) index);
    strcpy(new+index, entryPtr->string+index+count);
    ckfree(entryPtr->string);
    entryPtr->string = new;
    entryPtr->numChars -= count;
 
    /*
     * Deleting characters results in the remaining characters being
     * renumbered.  Update the various indexes into the string to reflect
     * this change.
     */
 
    if (entryPtr->selectFirst >= index) {
        if (entryPtr->selectFirst >= (index+count)) {
            entryPtr->selectFirst -= count;
        } else {
            entryPtr->selectFirst = index;
        }
    }
    if (entryPtr->selectLast >= index) {
        if (entryPtr->selectLast >= (index+count)) {
            entryPtr->selectLast -= count;
        } else {
            entryPtr->selectLast = index;
        }
    }
    if (entryPtr->selectLast <= entryPtr->selectFirst) {
        entryPtr->selectFirst = entryPtr->selectLast = -1;
    }
    if (entryPtr->selectAnchor >= index) {
        if (entryPtr->selectAnchor >= (index+count)) {
            entryPtr->selectAnchor -= count;
        } else {
            entryPtr->selectAnchor = index;
        }
    }
    if (entryPtr->leftIndex > index) {
        if (entryPtr->leftIndex >= (index+count)) {
            entryPtr->leftIndex -= count;
        } else {
            entryPtr->leftIndex = index;
        }
    }
    if (entryPtr->insertPos >= index) {
        if (entryPtr->insertPos >= (index+count)) {
            entryPtr->insertPos -= count;
        } else {
            entryPtr->insertPos = index;
        }
    }
    EntryValueChanged(entryPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryValueChanged --
 *
 *      This procedure is invoked when characters are inserted into
 *      an entry or deleted from it.  It updates the entry's associated
 *      variable, if there is one, and does other bookkeeping such
 *      as arranging for redisplay.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryValueChanged(entryPtr)
    Entry *entryPtr;            /* Entry whose value just changed. */
{
    char *newValue;
 
    if (entryPtr->textVarName == NULL) {
        newValue = NULL;
    } else {
        newValue = Tcl_SetVar(entryPtr->interp, entryPtr->textVarName,
                entryPtr->string, TCL_GLOBAL_ONLY);
    }
 
    if ((newValue != NULL) && (strcmp(newValue, entryPtr->string) != 0)) {
        /*
         * The value of the variable is different than what we asked for.
         * This means that a trace on the variable modified it.  In this
         * case our trace procedure wasn't invoked since the modification
         * came while a trace was already active on the variable.  So,
         * update our value to reflect the variable's latest value.
         */
 
        EntrySetValue(entryPtr, newValue);
    } else {
        /*
         * Arrange for redisplay.
         */
 
        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        EventuallyRedraw(entryPtr);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntrySetValue --
 *
 *      Replace the contents of a text entry with a given value.  This
 *      procedure is invoked when updating the entry from the entry's
 *      associated variable.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The string displayed in the entry will change.  The selection,
 *      insertion point, and view may have to be adjusted to keep them
 *      within the bounds of the new string.  Note: this procedure does
 *      *not* update the entry's associated variable, since that could
 *      result in an infinite loop.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntrySetValue(entryPtr, value)
    register Entry *entryPtr;           /* Entry whose value is to be
                                         * changed. */
    char *value;                        /* New text to display in entry. */
{
    ckfree(entryPtr->string);
    entryPtr->numChars = strlen(value);
    entryPtr->string = (char *) ckalloc((unsigned) (entryPtr->numChars + 1));
    strcpy(entryPtr->string, value);
    if (entryPtr->selectFirst != -1) {
        if (entryPtr->selectFirst >= entryPtr->numChars) {
            entryPtr->selectFirst = entryPtr->selectLast = -1;
        } else if (entryPtr->selectLast > entryPtr->numChars) {
            entryPtr->selectLast = entryPtr->numChars;
        }
    }
    if (entryPtr->leftIndex >= entryPtr->numChars) {
        entryPtr->leftIndex = entryPtr->numChars-1;
        if (entryPtr->leftIndex < 0) {
            entryPtr->leftIndex = 0;
        }
    }
    if (entryPtr->insertPos > entryPtr->numChars) {
        entryPtr->insertPos = entryPtr->numChars;
    }
 
    entryPtr->flags |= UPDATE_SCROLLBAR;
    EntryComputeGeometry(entryPtr);
    EventuallyRedraw(entryPtr);
}
 
/*
 *--------------------------------------------------------------
 *
 * EntryEventProc --
 *
 *      This procedure is invoked by the Tk dispatcher for various
 *      events on entryes.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      When the window gets deleted, internal structures get
 *      cleaned up.  When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */
 
static void
EntryEventProc(clientData, eventPtr)
    ClientData clientData;      /* Information about window. */
    XEvent *eventPtr;           /* Information about event. */
{
    Entry *entryPtr = (Entry *) clientData;
    if (eventPtr->type == Expose) {
        EventuallyRedraw(entryPtr);
        entryPtr->flags |= BORDER_NEEDED;
    } else if (eventPtr->type == DestroyNotify) {
        if (entryPtr->tkwin != NULL) {
            entryPtr->tkwin = NULL;
            Tcl_DeleteCommandFromToken(entryPtr->interp, entryPtr->widgetCmd);
        }
        if (entryPtr->flags & REDRAW_PENDING) {
            Tcl_CancelIdleCall(DisplayEntry, (ClientData) entryPtr);
        }
        Tcl_EventuallyFree((ClientData) entryPtr, DestroyEntry);
    } else if (eventPtr->type == ConfigureNotify) {
        Tcl_Preserve((ClientData) entryPtr);
        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        EventuallyRedraw(entryPtr);
        Tcl_Release((ClientData) entryPtr);
    } else if (eventPtr->type == FocusIn) {
        if (eventPtr->xfocus.detail != NotifyInferior) {
            EntryFocusProc(entryPtr, 1);
        }
    } else if (eventPtr->type == FocusOut) {
        if (eventPtr->xfocus.detail != NotifyInferior) {
            EntryFocusProc(entryPtr, 0);
        }
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryCmdDeletedProc --
 *
 *      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
EntryCmdDeletedProc(clientData)
    ClientData clientData;      /* Pointer to widget record for widget. */
{
    Entry *entryPtr = (Entry *) clientData;
    Tk_Window tkwin = entryPtr->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) {
        entryPtr->tkwin = NULL;
        Tk_DestroyWindow(tkwin);
    }
}
 
/*
 *--------------------------------------------------------------
 *
 * GetEntryIndex --
 *
 *      Parse an index into an entry and return either its value
 *      or an error.
 *
 * Results:
 *      A standard Tcl result.  If all went well, then *indexPtr is
 *      filled in with the index (into entryPtr) corresponding to
 *      string.  The index value is guaranteed to lie between 0 and
 *      the number of characters in the string, inclusive.  If an
 *      error occurs then an error message is left in interp->result.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */
 
static int
GetEntryIndex(interp, entryPtr, string, indexPtr)
    Tcl_Interp *interp;         /* For error messages. */
    Entry *entryPtr;            /* Entry for which the index is being
                                 * specified. */
    char *string;               /* Specifies character in entryPtr. */
    int *indexPtr;              /* Where to store converted index. */
{
    size_t length;
 
    length = strlen(string);
 
    if (string[0] == 'a') {
        if (strncmp(string, "anchor", length) == 0) {
            *indexPtr = entryPtr->selectAnchor;
        } else {
            badIndex:
 
            /*
             * Some of the paths here leave messages in interp->result,
             * so we have to clear it out before storing our own message.
             */
 
            Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
            Tcl_AppendResult(interp, "bad entry index \"", string,
                    "\"", (char *) NULL);
            return TCL_ERROR;
        }
    } else if (string[0] == 'e') {
        if (strncmp(string, "end", length) == 0) {
            *indexPtr = entryPtr->numChars;
        } else {
            goto badIndex;
        }
    } else if (string[0] == 'i') {
        if (strncmp(string, "insert", length) == 0) {
            *indexPtr = entryPtr->insertPos;
        } else {
            goto badIndex;
        }
    } else if (string[0] == 's') {
        if (entryPtr->selectFirst == -1) {
            interp->result = "selection isn't in entry";
            return TCL_ERROR;
        }
        if (length < 5) {
            goto badIndex;
        }
        if (strncmp(string, "sel.first", length) == 0) {
            *indexPtr = entryPtr->selectFirst;
        } else if (strncmp(string, "sel.last", length) == 0) {
            *indexPtr = entryPtr->selectLast;
        } else {
            goto badIndex;
        }
    } else if (string[0] == '@') {
        int x, roundUp;
 
        if (Tcl_GetInt(interp, string+1, &x) != TCL_OK) {
            goto badIndex;
        }
        if (x < entryPtr->inset) {
            x = entryPtr->inset;
        }
        roundUp = 0;
        if (x >= (Tk_Width(entryPtr->tkwin) - entryPtr->inset)) {
            x = Tk_Width(entryPtr->tkwin) - entryPtr->inset - 1;
            roundUp = 1;
        }
        *indexPtr = Tk_PointToChar(entryPtr->textLayout,
                x - entryPtr->layoutX, 0);
 
        /*
         * Special trick:  if the x-position was off-screen to the right,
         * round the index up to refer to the character just after the
         * last visible one on the screen.  This is needed to enable the
         * last character to be selected, for example.
         */
 
        if (roundUp && (*indexPtr < entryPtr->numChars)) {
            *indexPtr += 1;
        }
    } else {
        if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
            goto badIndex;
        }
        if (*indexPtr < 0){
            *indexPtr = 0;
        } else if (*indexPtr > entryPtr->numChars) {
            *indexPtr = entryPtr->numChars;
        }
    }
    if(*indexPtr > entryPtr->numChars)
        *indexPtr = entryPtr->numChars;
    return TCL_OK;
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryScanTo --
 *
 *      Given a y-coordinate (presumably of the curent mouse location)
 *      drag the view in the window to implement the scan operation.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The view in the window may change.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryScanTo(entryPtr, x)
    register Entry *entryPtr;           /* Information about widget. */
    int x;                              /* X-coordinate to use for scan
                                         * operation. */
{
    int newLeftIndex;
 
    /*
     * Compute new leftIndex for entry by amplifying the difference
     * between the current position and the place where the scan
     * started (the "mark" position).  If we run off the left or right
     * side of the entry, then reset the mark point so that the current
     * position continues to correspond to the edge of the window.
     * This means that the picture will start dragging as soon as the
     * mouse reverses direction (without this reset, might have to slide
     * mouse a long ways back before the picture starts moving again).
     */
 
    newLeftIndex = entryPtr->scanMarkIndex
            - (10*(x - entryPtr->scanMarkX))/entryPtr->avgWidth;
    if (newLeftIndex >= entryPtr->numChars) {
        newLeftIndex = entryPtr->scanMarkIndex = entryPtr->numChars-1;
        entryPtr->scanMarkX = x;
    }
    if (newLeftIndex < 0) {
        newLeftIndex = entryPtr->scanMarkIndex = 0;
        entryPtr->scanMarkX = x;
    }
    if (newLeftIndex != entryPtr->leftIndex) {
        entryPtr->leftIndex = newLeftIndex;
        entryPtr->flags |= UPDATE_SCROLLBAR;
        EntryComputeGeometry(entryPtr);
        EventuallyRedraw(entryPtr);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntrySelectTo --
 *
 *      Modify the selection by moving its un-anchored end.  This could
 *      make the selection either larger or smaller.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The selection changes.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntrySelectTo(entryPtr, index)
    register Entry *entryPtr;           /* Information about widget. */
    int index;                          /* Index of element that is to
                                         * become the "other" end of the
                                         * selection. */
{
    int newFirst, newLast;
 
    /*
     * Grab the selection if we don't own it already.
     */
 
    if (!(entryPtr->flags & GOT_SELECTION) && (entryPtr->exportSelection)) {
        Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection,
                (ClientData) entryPtr);
        entryPtr->flags |= GOT_SELECTION;
    }
 
    /*
     * Pick new starting and ending points for the selection.
     */
 
    if (entryPtr->selectAnchor > entryPtr->numChars) {
        entryPtr->selectAnchor = entryPtr->numChars;
    }
    if (entryPtr->selectAnchor <= index) {
        newFirst = entryPtr->selectAnchor;
        newLast = index;
    } else {
        newFirst = index;
        newLast = entryPtr->selectAnchor;
        if (newLast < 0) {
            newFirst = newLast = -1;
        }
    }
    if ((entryPtr->selectFirst == newFirst)
            && (entryPtr->selectLast == newLast)) {
        return;
    }
    entryPtr->selectFirst = newFirst;
    entryPtr->selectLast = newLast;
    EventuallyRedraw(entryPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryFetchSelection --
 *
 *      This procedure is called back by Tk when the selection is
 *      requested by someone.  It returns part or all of the selection
 *      in a buffer provided by the caller.
 *
 * Results:
 *      The return value is the number of non-NULL bytes stored
 *      at buffer.  Buffer is filled (or partially filled) with a
 *      NULL-terminated string containing part or all of the selection,
 *      as given by offset and maxBytes.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */
 
static int
EntryFetchSelection(clientData, offset, buffer, maxBytes)
    ClientData clientData;              /* Information about entry widget. */
    int offset;                         /* Offset within selection of first
                                         * character to be returned. */
    char *buffer;                       /* Location in which to place
                                         * selection. */
    int maxBytes;                       /* Maximum number of bytes to place
                                         * at buffer, not including terminating
                                         * NULL character. */
{
    Entry *entryPtr = (Entry *) clientData;
    int count;
    char *displayString;
 
    if ((entryPtr->selectFirst < 0) || !(entryPtr->exportSelection)) {
        return -1;
    }
    count = entryPtr->selectLast - entryPtr->selectFirst - offset;
    if (count > maxBytes) {
        count = maxBytes;
    }
    if (count <= 0) {
        return 0;
    }
    if (entryPtr->displayString == NULL) {
        displayString = entryPtr->string;
    } else {
        displayString = entryPtr->displayString;
    }
    strncpy(buffer, displayString + entryPtr->selectFirst + offset,
            (size_t) count);
    buffer[count] = '\0';
    return count;
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryLostSelection --
 *
 *      This procedure is called back by Tk when the selection is
 *      grabbed away from an entry widget.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The existing selection is unhighlighted, and the window is
 *      marked as not containing a selection.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryLostSelection(clientData)
    ClientData clientData;              /* Information about entry widget. */
{
    Entry *entryPtr = (Entry *) clientData;
 
    entryPtr->flags &= ~GOT_SELECTION;
 
    /*
     * On Windows and Mac systems, we want to remember the selection
     * for the next time the focus enters the window.  On Unix, we need
     * to clear the selection since it is always visible.
     */
 
#ifdef ALWAYS_SHOW_SELECTION
    if ((entryPtr->selectFirst != -1) && entryPtr->exportSelection) {
        entryPtr->selectFirst = -1;
        entryPtr->selectLast = -1;
        EventuallyRedraw(entryPtr);
    }
#endif
}
 
/*
 *----------------------------------------------------------------------
 *
 * EventuallyRedraw --
 *
 *      Ensure that an entry is eventually redrawn on the display.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Information gets redisplayed.  Right now we don't do selective
 *      redisplays:  the whole window will be redrawn.  This doesn't
 *      seem to hurt performance noticeably, but if it does then this
 *      could be changed.
 *
 *----------------------------------------------------------------------
 */
 
static void
EventuallyRedraw(entryPtr)
    register Entry *entryPtr;           /* Information about widget. */
{
    if ((entryPtr->tkwin == NULL) || !Tk_IsMapped(entryPtr->tkwin)) {
        return;
    }
 
    /*
     * Right now we don't do selective redisplays:  the whole window
     * will be redrawn.  This doesn't seem to hurt performance noticeably,
     * but if it does then this could be changed.
     */
 
    if (!(entryPtr->flags & REDRAW_PENDING)) {
        entryPtr->flags |= REDRAW_PENDING;
        Tcl_DoWhenIdle(DisplayEntry, (ClientData) entryPtr);
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryVisibleRange --
 *
 *      Return information about the range of the entry that is
 *      currently visible.
 *
 * Results:
 *      *firstPtr and *lastPtr are modified to hold fractions between
 *      0 and 1 identifying the range of characters visible in the
 *      entry.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryVisibleRange(entryPtr, firstPtr, lastPtr)
    Entry *entryPtr;                    /* Information about widget. */
    double *firstPtr;                   /* Return position of first visible
                                         * character in widget. */
    double *lastPtr;                    /* Return position of char just after
                                         * last visible one. */
{
    int charsInWindow;
 
    if (entryPtr->numChars == 0) {
        *firstPtr = 0.0;
        *lastPtr = 1.0;
    } else {
        charsInWindow = Tk_PointToChar(entryPtr->textLayout,
                Tk_Width(entryPtr->tkwin) - entryPtr->inset
                        - entryPtr->layoutX - 1, 0) + 1;
        if (charsInWindow > entryPtr->numChars) {
            /*
             * If all chars were visible, then charsInWindow will be
             * the index just after the last char that was visible.
             */
 
            charsInWindow = entryPtr->numChars;
        }
        charsInWindow -= entryPtr->leftIndex;
        if (charsInWindow == 0) {
            charsInWindow = 1;
        }
        *firstPtr = ((double) entryPtr->leftIndex)/entryPtr->numChars;
        *lastPtr = ((double) (entryPtr->leftIndex + charsInWindow))
                /entryPtr->numChars;
    }
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryUpdateScrollbar --
 *
 *      This procedure is invoked whenever information has changed in
 *      an entry in a way that would invalidate a scrollbar display.
 *      If there is an associated scrollbar, then this procedure updates
 *      it by invoking a Tcl command.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      A Tcl command is invoked, and an additional command may be
 *      invoked to process errors in the command.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryUpdateScrollbar(entryPtr)
    Entry *entryPtr;                    /* Information about widget. */
{
    char args[100];
    int code;
    double first, last;
    Tcl_Interp *interp;
 
    if (entryPtr->scrollCmd == NULL) {
        return;
    }
 
    interp = entryPtr->interp;
    Tcl_Preserve((ClientData) interp);
    EntryVisibleRange(entryPtr, &first, &last);
    sprintf(args, " %g %g", first, last);
    code = Tcl_VarEval(interp, entryPtr->scrollCmd, args, (char *) NULL);
    if (code != TCL_OK) {
        Tcl_AddErrorInfo(interp,
                "\n    (horizontal scrolling command executed by entry)");
        Tcl_BackgroundError(interp);
    }
    Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
    Tcl_Release((ClientData) interp);
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryBlinkProc --
 *
 *      This procedure is called as a timer handler to blink the
 *      insertion cursor off and on.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The cursor gets turned on or off, redisplay gets invoked,
 *      and this procedure reschedules itself.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryBlinkProc(clientData)
    ClientData clientData;      /* Pointer to record describing entry. */
{
    register Entry *entryPtr = (Entry *) clientData;
 
    if (!(entryPtr->flags & GOT_FOCUS) || (entryPtr->insertOffTime == 0)) {
        return;
    }
    if (entryPtr->flags & CURSOR_ON) {
        entryPtr->flags &= ~CURSOR_ON;
        entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                entryPtr->insertOffTime, EntryBlinkProc, (ClientData) entryPtr);
    } else {
        entryPtr->flags |= CURSOR_ON;
        entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                entryPtr->insertOnTime, EntryBlinkProc, (ClientData) entryPtr);
    }
    EventuallyRedraw(entryPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
 * EntryFocusProc --
 *
 *      This procedure is called whenever the entry gets or loses the
 *      input focus.  It's also called whenever the window is reconfigured
 *      while it has the focus.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The cursor gets turned on or off.
 *
 *----------------------------------------------------------------------
 */
 
static void
EntryFocusProc(entryPtr, gotFocus)
    register Entry *entryPtr;   /* Entry that got or lost focus. */
    int gotFocus;               /* 1 means window is getting focus, 0 means
                                 * it's losing it. */
{
    Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler);
    if (gotFocus) {
        entryPtr->flags |= GOT_FOCUS | CURSOR_ON;
        if (entryPtr->insertOffTime != 0) {
            entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                    entryPtr->insertOnTime, EntryBlinkProc,
                    (ClientData) entryPtr);
        }
    } else {
        entryPtr->flags &= ~(GOT_FOCUS | CURSOR_ON);
        entryPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
    }
    EventuallyRedraw(entryPtr);
}
 
/*
 *--------------------------------------------------------------
 *
 * EntryTextVarProc --
 *
 *      This procedure is invoked when someone changes the variable
 *      whose contents are to be displayed in an entry.
 *
 * Results:
 *      NULL is always returned.
 *
 * Side effects:
 *      The text displayed in the entry will change to match the
 *      variable.
 *
 *--------------------------------------------------------------
 */
 
        /* ARGSUSED */
static char *
EntryTextVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;      /* Information about button. */
    Tcl_Interp *interp;         /* Interpreter containing variable. */
    char *name1;                /* Not used. */
    char *name2;                /* Not used. */
    int flags;                  /* Information about what happened. */
{
    register Entry *entryPtr = (Entry *) 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, entryPtr->textVarName, entryPtr->string,
                    TCL_GLOBAL_ONLY);
            Tcl_TraceVar(interp, entryPtr->textVarName,
                    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                    EntryTextVarProc, clientData);
        }
        return (char *) NULL;
    }
 
    /*
     * Update the entry's text with the value of the variable, unless
     * the entry already has that value (this happens when the variable
     * changes value because we changed it because someone typed in
     * the entry).
     */
 
    value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY);
    if (value == NULL) {
        value = "";
    }
    if (strcmp(value, entryPtr->string) != 0) {
        EntrySetValue(entryPtr, value);
    }
    return (char *) NULL;
}
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[/] [or1k/] [tags/] [start/] [insight/] [tk/] [generic/] [tkEntry.c] - Blame information for rev 1780

Line No.	Rev	Author	Line
1	578	markom	`/*`
2			`* tkEntry.c --`
3			`*`
4			`* This module implements entry widgets for the Tk`
5			`* toolkit. An entry displays a string and allows`
6			`* the string to be edited.`
7			`*`
8			`* Copyright (c) 1990-1994 The Regents of the University of California.`
9			`* Copyright (c) 1994-1996 Sun Microsystems, Inc.`
10			`*`
11			`* See the file "license.terms" for information on usage and redistribution`
12			`* of this file, and for a DISCLAIMER OF ALL WARRANTIES.`
13			`*`
14			`* RCS: @(#) $Id: tkEntry.c,v 1.1.1.1 2002-01-16 10:25:51 markom Exp $`
15			`*/`
16
17			`#include "tkInt.h"`
18			`#include "default.h"`
19
20			`/*`
21			`* A data structure of the following type is kept for each entry`
22			`* widget managed by this file:`
23			`*/`
24
25			`typedef struct {`
26			`Tk_Window tkwin; /* Window that embodies the entry. NULL`
27			`* means that the window has been destroyed`
28			`* but the data structures haven't yet been`
29			`* cleaned up.*/`
30			`Display display; / Display containing widget. Used, among`
31			`* other things, so that resources can be`
32			`* freed even after tkwin has gone away. */`
33			`Tcl_Interp interp; / Interpreter associated with entry. */`
34			`Tcl_Command widgetCmd; /* Token for entry's widget command. */`
35
36			`/*`
37			`* Fields that are set by widget commands other than "configure".`
38			`*/`
39
40			`char string; / Pointer to storage for string;`