src/c_tk_base_7_5_w_mods/tkcanvtext.c

/* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tk_base/tkcanvtext.c,v 1.1.1.1 2001/06/13 04:57:44 dtashley Exp $ */

/* 
 * tkCanvText.c --
 *
 *      This file implements text items for canvas widgets.
 *
 * Copyright (c) 1991-1994 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: tkcanvtext.c,v 1.1.1.1 2001/06/13 04:57:44 dtashley Exp $
 */

#include <stdio.h>
#include "tkInt.h"
#include "tkCanvas.h"
#include "tkPort.h"
#include "default.h"

/*
 * The structure below defines the record for each text item.
 */

typedef struct TextItem  {
    Tk_Item header;             /* Generic stuff that's the same for all
                                 * types.  MUST BE FIRST IN STRUCTURE. */
    Tk_CanvasTextInfo *textInfoPtr;
                                /* Pointer to a structure containing
                                 * information about the selection and
                                 * insertion cursor.  The structure is owned
                                 * by (and shared with) the generic canvas
                                 * code. */
    /*
     * Fields that are set by widget commands other than "configure".
     */
     
    double x, y;                /* Positioning point for text. */
    int insertPos;              /* Character index of character just before
                                 * which the insertion cursor is displayed. */

    /*
     * Configuration settings that are updated by Tk_ConfigureWidget.
     */

    Tk_Anchor anchor;           /* Where to anchor text relative to (x,y). */
    Tk_TSOffset tsoffset;
    XColor *color;              /* Color for text. */
    XColor *activeColor;        /* Color for text. */
    XColor *disabledColor;      /* Color for text. */
    Tk_Font tkfont;             /* Font for drawing text. */
    Tk_Justify justify;         /* Justification mode for text. */
    Pixmap stipple;             /* Stipple bitmap for text, or None. */
    Pixmap activeStipple;       /* Stipple bitmap for text, or None. */
    Pixmap disabledStipple;     /* Stipple bitmap for text, or None. */
    char *text;                 /* Text for item (malloc-ed). */
    int width;                  /* Width of lines for word-wrap, pixels.
                                 * Zero means no word-wrap. */

    /*
     * Fields whose values are derived from the current values of the
     * configuration settings above.
     */

    int numChars;               /* Length of text in characters. */
    int numBytes;               /* Length of text in bytes. */
    Tk_TextLayout textLayout;   /* Cached text layout information. */
    int leftEdge;               /* Pixel location of the left edge of the
                                 * text item; where the left border of the
                                 * text layout is drawn. */
    int rightEdge;              /* Pixel just to right of right edge of
                                 * area of text item.  Used for selecting up
                                 * to end of line. */
    GC gc;                      /* Graphics context for drawing text. */
    GC selTextGC;               /* Graphics context for selected text. */
    GC cursorOffGC;             /* If not None, this gives a graphics context
                                 * to use to draw the insertion cursor when
                                 * it's off.  Used if the selection and
                                 * insertion cursor colors are the same.  */
} TextItem;

/*
 * Information used for parsing configuration specs:
 */

static Tk_CustomOption stateOption = {
    (Tk_OptionParseProc *) TkStateParseProc,
    TkStatePrintProc, (ClientData) 2
};
static Tk_CustomOption tagsOption = {
    (Tk_OptionParseProc *) Tk_CanvasTagsParseProc,
    Tk_CanvasTagsPrintProc, (ClientData) NULL
};
static Tk_CustomOption offsetOption = {
    (Tk_OptionParseProc *) TkOffsetParseProc,
    TkOffsetPrintProc, (ClientData) (TK_OFFSET_RELATIVE)
};

static Tk_ConfigSpec configSpecs[] = {
    {TK_CONFIG_COLOR, "-activefill", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(TextItem, activeColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-activestipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(TextItem, activeStipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL,
        "center", Tk_Offset(TextItem, anchor),
        TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_COLOR, "-disabledfill", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(TextItem, disabledColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-disabledstipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(TextItem, disabledStipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
        "black", Tk_Offset(TextItem, color), TK_CONFIG_NULL_OK},
    {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL,
        DEF_CANVTEXT_FONT, Tk_Offset(TextItem, tkfont), 0},
    {TK_CONFIG_JUSTIFY, "-justify", (char *) NULL, (char *) NULL,
        "left", Tk_Offset(TextItem, justify),
        TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_CUSTOM, "-offset", (char *) NULL, (char *) NULL,
        "0,0", Tk_Offset(TextItem, tsoffset),
        TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
    {TK_CONFIG_CUSTOM, "-state", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK,
        &stateOption},
    {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
        (char *) NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
        (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
    {TK_CONFIG_STRING, "-text", (char *) NULL, (char *) NULL,
        "", Tk_Offset(TextItem, text), 0},
    {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
        "0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
        (char *) NULL, 0, 0}
};

/*
 * Prototypes for procedures defined in this file:
 */

static void             ComputeTextBbox _ANSI_ARGS_((Tk_Canvas canvas,
                            TextItem *textPtr));
static int              ConfigureText _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
                            Tcl_Obj *CONST argv[], int flags));
static int              CreateText _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, struct Tk_Item *itemPtr,
                            int argc, Tcl_Obj *CONST argv[]));
static void             DeleteText _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, Display *display));
static void             DisplayCanvText _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, Display *display, Drawable dst,
                            int x, int y, int width, int height));
static int              GetSelText _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, int offset, char *buffer,
                            int maxBytes));
static int              GetTextIndex _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr,
                            Tcl_Obj *obj, int *indexPtr));
static void             ScaleText _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double originX, double originY,
                            double scaleX, double scaleY));
static void             SetTextCursor _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, int index));
static int              TextCoords _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr,
                            int argc, Tcl_Obj *CONST argv[]));
static void             TextDeleteChars _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, int first, int last));
static void             TextInsert _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, int beforeThis, char *string));
static int              TextToArea _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double *rectPtr));
static double           TextToPoint _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double *pointPtr));
static int              TextToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
                            Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
static void             TranslateText _ANSI_ARGS_((Tk_Canvas canvas,
                            Tk_Item *itemPtr, double deltaX, double deltaY));

/*
 * The structures below defines the rectangle and oval item types
 * by means of procedures that can be invoked by generic item code.
 */

Tk_ItemType tkTextType = {
    "text",                     /* name */
    sizeof(TextItem),           /* itemSize */
    CreateText,                 /* createProc */
    configSpecs,                /* configSpecs */
    ConfigureText,              /* configureProc */
    TextCoords,                 /* coordProc */
    DeleteText,                 /* deleteProc */
    DisplayCanvText,            /* displayProc */
    TK_CONFIG_OBJS,             /* flags */
    TextToPoint,                /* pointProc */
    TextToArea,                 /* areaProc */
    TextToPostscript,           /* postscriptProc */
    ScaleText,                  /* scaleProc */
    TranslateText,              /* translateProc */
    (Tk_ItemIndexProc *) GetTextIndex,/* indexProc */
    SetTextCursor,              /* icursorProc */
    GetSelText,                 /* selectionProc */
    TextInsert,                 /* insertProc */
    TextDeleteChars,            /* dTextProc */
    (Tk_ItemType *) NULL,       /* nextPtr */
};

/*
 *--------------------------------------------------------------
 *
 * CreateText --
 *
 *      This procedure is invoked to create a new text item
 *      in a canvas.
 *
 * Results:
 *      A standard Tcl return value.  If an error occurred in
 *      creating the item then an error message is left in
 *      the interp's result;  in this case itemPtr is left uninitialized
 *      so it can be safely freed by the caller.
 *
 * Side effects:
 *      A new text item is created.
 *
 *--------------------------------------------------------------
 */

static int
CreateText(interp, canvas, itemPtr, argc, argv)
    Tcl_Interp *interp;         /* Interpreter for error reporting. */
    Tk_Canvas canvas;           /* Canvas to hold new item. */
    Tk_Item *itemPtr;           /* Record to hold new item; header has been
                                 * initialized by caller. */
    int argc;                   /* Number of arguments in argv. */
    Tcl_Obj *CONST argv[];      /* Arguments describing rectangle. */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    int i;

    if (argc==1) {
        i = 1;
    } else {
        char *arg = Tcl_GetStringFromObj(argv[1], NULL);
        if ((argc>1) && (arg[0] == '-')
                && (arg[1] >= 'a') && (arg[1] <= 'z')) {
            i = 1;
        } else {
            i = 2;
        }
    }

    if (argc < i) {
        Tcl_AppendResult(interp, "wrong # args: should be \"",
                Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
                itemPtr->typePtr->name, " x y ?options?\"", (char *) NULL);
        return TCL_ERROR;
    }

    /*
     * Carry out initialization that is needed in order to clean up after
     * errors during the the remainder of this procedure.
     */

    textPtr->textInfoPtr = Tk_CanvasGetTextInfo(canvas);

    textPtr->insertPos  = 0;

    textPtr->anchor     = TK_ANCHOR_CENTER;
    textPtr->tsoffset.flags = 0;
    textPtr->tsoffset.xoffset = 0;
    textPtr->tsoffset.yoffset = 0;
    textPtr->color      = NULL;
    textPtr->activeColor = NULL;
    textPtr->disabledColor = NULL;
    textPtr->tkfont     = NULL;
    textPtr->justify    = TK_JUSTIFY_LEFT;
    textPtr->stipple    = None;
    textPtr->activeStipple = None;
    textPtr->disabledStipple = None;
    textPtr->text       = NULL;
    textPtr->width      = 0;

    textPtr->numChars   = 0;
    textPtr->numBytes   = 0;
    textPtr->textLayout = NULL;
    textPtr->leftEdge   = 0;
    textPtr->rightEdge  = 0;
    textPtr->gc         = None;
    textPtr->selTextGC  = None;
    textPtr->cursorOffGC = None;

    /*
     * Process the arguments to fill in the item record.
     */

    if ((TextCoords(interp, canvas, itemPtr, i, argv) != TCL_OK)) {
        goto error;
    }
    if (ConfigureText(interp, canvas, itemPtr, argc-i, argv+i, 0) == TCL_OK) {
        return TCL_OK;
    }

    error:
    DeleteText(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
    return TCL_ERROR;
}

/*
 *--------------------------------------------------------------
 *
 * TextCoords --
 *
 *      This procedure is invoked to process the "coords" widget
 *      command on text items.  See the user documentation for
 *      details on what it does.
 *
 * Results:
 *      Returns TCL_OK or TCL_ERROR, and sets the interp's result.
 *
 * Side effects:
 *      The coordinates for the given item may be changed.
 *
 *--------------------------------------------------------------
 */

static int
TextCoords(interp, canvas, itemPtr, argc, argv)
    Tcl_Interp *interp;         /* Used for error reporting. */
    Tk_Canvas canvas;           /* Canvas containing item. */
    Tk_Item *itemPtr;           /* Item whose coordinates are to be read or
                                 * modified. */
    int argc;                   /* Number of coordinates supplied in argv. */
    Tcl_Obj *CONST argv[];      /* Array of coordinates: x1, y1, x2, y2, ... */
{
    TextItem *textPtr = (TextItem *) itemPtr;

    if (argc == 0) {
        Tcl_Obj *obj = Tcl_NewObj();
        Tcl_Obj *subobj = Tcl_NewDoubleObj(textPtr->x);
        Tcl_ListObjAppendElement(interp, obj, subobj);
        subobj = Tcl_NewDoubleObj(textPtr->y);
        Tcl_ListObjAppendElement(interp, obj, subobj);
        Tcl_SetObjResult(interp, obj);
    } else if (argc < 3) {
        if (argc==1) {
            if (Tcl_ListObjGetElements(interp, argv[0], &argc,
                    (Tcl_Obj ***) &argv) != TCL_OK) {
                return TCL_ERROR;
            } else if (argc != 2) {
                char buf[64 + TCL_INTEGER_SPACE];

                sprintf(buf, "wrong # coordinates: expected 2, got %d", argc);
                Tcl_SetResult(interp, buf, TCL_VOLATILE);
                return TCL_ERROR;
            }
        }
        if ((Tk_CanvasGetCoordFromObj(interp, canvas, argv[0], &textPtr->x) != TCL_OK)
                || (Tk_CanvasGetCoordFromObj(interp, canvas, argv[1],
                    &textPtr->y) != TCL_OK)) {
            return TCL_ERROR;
        }
        ComputeTextBbox(canvas, textPtr);
    } else {
        char buf[64 + TCL_INTEGER_SPACE];
        
        sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", argc);
        Tcl_SetResult(interp, buf, TCL_VOLATILE);
        return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ConfigureText --
 *
 *      This procedure is invoked to configure various aspects
 *      of a text item, such as its border and background colors.
 *
 * Results:
 *      A standard Tcl result code.  If an error occurs, then
 *      an error message is left in the interp's result.
 *
 * Side effects:
 *      Configuration information, such as colors and stipple
 *      patterns, may be set for itemPtr.
 *
 *--------------------------------------------------------------
 */

static int
ConfigureText(interp, canvas, itemPtr, argc, argv, flags)
    Tcl_Interp *interp;         /* Interpreter for error reporting. */
    Tk_Canvas canvas;           /* Canvas containing itemPtr. */
    Tk_Item *itemPtr;           /* Rectangle item to reconfigure. */
    int argc;                   /* Number of elements in argv.  */
    Tcl_Obj *CONST argv[];      /* Arguments describing things to configure. */
    int flags;                  /* Flags to pass to Tk_ConfigureWidget. */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    XGCValues gcValues;
    GC newGC, newSelGC;
    unsigned long mask;
    Tk_Window tkwin;
    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
    XColor *selBgColorPtr;
    XColor *color;
    Pixmap stipple;
    Tk_State state;

    tkwin = Tk_CanvasTkwin(canvas);
    if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, (char **) argv,
            (char *) textPtr, flags|TK_CONFIG_OBJS) != TCL_OK) {
        return TCL_ERROR;
    }

    /*
     * A few of the options require additional processing, such as
     * graphics contexts.
     */

    state = itemPtr->state;

    if (textPtr->activeColor != NULL ||
            textPtr->activeStipple != None) {
        itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
    } else {
        itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
    }

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }

    color = textPtr->color;
    stipple = textPtr->stipple;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (textPtr->activeColor!=NULL) {
            color = textPtr->activeColor;
        }
        if (textPtr->activeStipple!=None) {
            stipple = textPtr->activeStipple;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (textPtr->disabledColor!=NULL) {
            color = textPtr->disabledColor;
        }
        if (textPtr->disabledStipple!=None) {
            stipple = textPtr->disabledStipple;
        }
    }

    newGC = newSelGC = None;
    if (textPtr->tkfont != NULL) {
        gcValues.font = Tk_FontId(textPtr->tkfont);
        mask = GCFont;
        if (color != NULL) {
            gcValues.foreground = color->pixel;
            mask |= GCForeground;
            if (stipple != None) {
                gcValues.stipple = stipple;
                gcValues.fill_style = FillStippled;
                mask |= GCStipple|GCFillStyle;
            }
            newGC = Tk_GetGC(tkwin, mask, &gcValues);
        }
        mask &= ~(GCTile|GCFillStyle|GCStipple);
        if (stipple != None) {
            gcValues.stipple = stipple;
            gcValues.fill_style = FillStippled;
            mask |= GCStipple|GCFillStyle;
        }
        gcValues.foreground = textInfoPtr->selFgColorPtr->pixel;
        newSelGC = Tk_GetGC(tkwin, mask|GCForeground, &gcValues);
    }
    if (textPtr->gc != None) {
        Tk_FreeGC(Tk_Display(tkwin), textPtr->gc);
    }
    textPtr->gc = newGC;
    if (textPtr->selTextGC != None) {
        Tk_FreeGC(Tk_Display(tkwin), textPtr->selTextGC);
    }
    textPtr->selTextGC = newSelGC;

    selBgColorPtr = Tk_3DBorderColor(textInfoPtr->selBorder);
    if (Tk_3DBorderColor(textInfoPtr->insertBorder)->pixel
            == selBgColorPtr->pixel) {
        if (selBgColorPtr->pixel == BlackPixelOfScreen(Tk_Screen(tkwin))) {
            gcValues.foreground = WhitePixelOfScreen(Tk_Screen(tkwin));
        } else {
            gcValues.foreground = BlackPixelOfScreen(Tk_Screen(tkwin));
        }
        newGC = Tk_GetGC(tkwin, GCForeground, &gcValues);
    } else {
        newGC = None;
    }
    if (textPtr->cursorOffGC != None) {
        Tk_FreeGC(Tk_Display(tkwin), textPtr->cursorOffGC);
    }
    textPtr->cursorOffGC = newGC;


    /*
     * If the text was changed, move the selection and insertion indices
     * to keep them inside the item.
     */

    textPtr->numBytes = strlen(textPtr->text);
    textPtr->numChars = Tcl_NumUtfChars(textPtr->text, textPtr->numBytes);
    if (textInfoPtr->selItemPtr == itemPtr) {
        
        if (textInfoPtr->selectFirst >= textPtr->numChars) {
            textInfoPtr->selItemPtr = NULL;
        } else {
            if (textInfoPtr->selectLast >= textPtr->numChars) {
                textInfoPtr->selectLast = textPtr->numChars - 1;
            }
            if ((textInfoPtr->anchorItemPtr == itemPtr)
                    && (textInfoPtr->selectAnchor >= textPtr->numChars)) {
                textInfoPtr->selectAnchor = textPtr->numChars - 1;
            }
        }
    }
    if (textPtr->insertPos >= textPtr->numChars) {
        textPtr->insertPos = textPtr->numChars;
    }

    ComputeTextBbox(canvas, textPtr);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * DeleteText --
 *
 *      This procedure is called to clean up the data structure
 *      associated with a text item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Resources associated with itemPtr are released.
 *
 *--------------------------------------------------------------
 */

static void
DeleteText(canvas, itemPtr, display)
    Tk_Canvas canvas;           /* Info about overall canvas widget. */
    Tk_Item *itemPtr;           /* Item that is being deleted. */
    Display *display;           /* Display containing window for canvas. */
{
    TextItem *textPtr = (TextItem *) itemPtr;

    if (textPtr->color != NULL) {
        Tk_FreeColor(textPtr->color);
    }
    if (textPtr->activeColor != NULL) {
        Tk_FreeColor(textPtr->activeColor);
    }
    if (textPtr->disabledColor != NULL) {
        Tk_FreeColor(textPtr->disabledColor);
    }
    Tk_FreeFont(textPtr->tkfont);
    if (textPtr->stipple != None) {
        Tk_FreeBitmap(display, textPtr->stipple);
    }
    if (textPtr->activeStipple != None) {
        Tk_FreeBitmap(display, textPtr->activeStipple);
    }
    if (textPtr->disabledStipple != None) {
        Tk_FreeBitmap(display, textPtr->disabledStipple);
    }
    if (textPtr->text != NULL) {
        ckfree(textPtr->text);
    }

    Tk_FreeTextLayout(textPtr->textLayout);
    if (textPtr->gc != None) {
        Tk_FreeGC(display, textPtr->gc);
    }
    if (textPtr->selTextGC != None) {
        Tk_FreeGC(display, textPtr->selTextGC);
    }
    if (textPtr->cursorOffGC != None) {
        Tk_FreeGC(display, textPtr->cursorOffGC);
    }
}

/*
 *--------------------------------------------------------------
 *
 * ComputeTextBbox --
 *
 *      This procedure is invoked to compute the bounding box of
 *      all the pixels that may be drawn as part of a text item.
 *      In addition, it recomputes all of the geometry information
 *      used to display a text item or check for mouse hits.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The fields x1, y1, x2, and y2 are updated in the header
 *      for itemPtr, and the linePtr structure is regenerated
 *      for itemPtr.
 *
 *--------------------------------------------------------------
 */

static void
ComputeTextBbox(canvas, textPtr)
    Tk_Canvas canvas;           /* Canvas that contains item. */
    TextItem *textPtr;          /* Item whose bbox is to be recomputed. */
{
    Tk_CanvasTextInfo *textInfoPtr;
    int leftX, topY, width, height, fudge;
    Tk_State state = textPtr->header.state;

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }

    Tk_FreeTextLayout(textPtr->textLayout);
    textPtr->textLayout = Tk_ComputeTextLayout(textPtr->tkfont,
            textPtr->text, textPtr->numChars, textPtr->width,
            textPtr->justify, 0, &width, &height);

    if (state == TK_STATE_HIDDEN || textPtr->color == NULL) {
        width = height = 0;
    }

    /*
     * Use overall geometry information to compute the top-left corner
     * of the bounding box for the text item.
     */

    leftX = (int) (textPtr->x + 0.5);
    topY = (int) (textPtr->y + 0.5);
    switch (textPtr->anchor) {
        case TK_ANCHOR_NW:
        case TK_ANCHOR_N:
        case TK_ANCHOR_NE:
            break;

        case TK_ANCHOR_W:
        case TK_ANCHOR_CENTER:
        case TK_ANCHOR_E:
            topY -= height / 2;
            break;

        case TK_ANCHOR_SW:
        case TK_ANCHOR_S:
        case TK_ANCHOR_SE:
            topY -= height;
            break;
    }
    switch (textPtr->anchor) {
        case TK_ANCHOR_NW:
        case TK_ANCHOR_W:
        case TK_ANCHOR_SW:
            break;

        case TK_ANCHOR_N:
        case TK_ANCHOR_CENTER:
        case TK_ANCHOR_S:
            leftX -= width / 2;
            break;

        case TK_ANCHOR_NE:
        case TK_ANCHOR_E:
        case TK_ANCHOR_SE:
            leftX -= width;
            break;
    }

    textPtr->leftEdge  = leftX;
    textPtr->rightEdge = leftX + width;

    /*
     * Last of all, update the bounding box for the item.  The item's
     * bounding box includes the bounding box of all its lines, plus
     * an extra fudge factor for the cursor border (which could
     * potentially be quite large).
     */

    textInfoPtr = textPtr->textInfoPtr;
    fudge = (textInfoPtr->insertWidth + 1) / 2;
    if (textInfoPtr->selBorderWidth > fudge) {
        fudge = textInfoPtr->selBorderWidth;
    }
    textPtr->header.x1 = leftX - fudge;
    textPtr->header.y1 = topY;
    textPtr->header.x2 = leftX + width + fudge;
    textPtr->header.y2 = topY + height;
}

/*
 *--------------------------------------------------------------
 *
 * DisplayCanvText --
 *
 *      This procedure is invoked to draw a text item in a given
 *      drawable.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      ItemPtr is drawn in drawable using the transformation
 *      information in canvas.
 *
 *--------------------------------------------------------------
 */

static void
DisplayCanvText(canvas, itemPtr, display, drawable, x, y, width, height)
    Tk_Canvas canvas;           /* Canvas that contains item. */
    Tk_Item *itemPtr;           /* Item to be displayed. */
    Display *display;           /* Display on which to draw item. */
    Drawable drawable;          /* Pixmap or window in which to draw item. */
    int x, y, width, height;    /* Describes region of canvas that must be
                                 * redisplayed (not used). */
{
    TextItem *textPtr;
    Tk_CanvasTextInfo *textInfoPtr;
    int selFirstChar, selLastChar;
    short drawableX, drawableY;
    Pixmap stipple;
    Tk_State state = itemPtr->state;

    textPtr = (TextItem *) itemPtr;
    textInfoPtr = textPtr->textInfoPtr;

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    stipple = textPtr->stipple;
    if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (textPtr->activeStipple!=None) {
            stipple = textPtr->activeStipple;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (textPtr->disabledStipple!=None) {
            stipple = textPtr->disabledStipple;
        }
    }

    if (textPtr->gc == None) {
        return;
    }

    /*
     * If we're stippling, then modify the stipple offset in the GC.  Be
     * sure to reset the offset when done, since the GC is supposed to be
     * read-only.
     */

    if (stipple != None) {
        Tk_CanvasSetOffset(canvas, textPtr->gc, &textPtr->tsoffset);
    }

    selFirstChar = -1;
    selLastChar = 0;            /* lint. */

    if (textInfoPtr->selItemPtr == itemPtr) {
        selFirstChar = textInfoPtr->selectFirst;
        selLastChar = textInfoPtr->selectLast;
        if (selLastChar > textPtr->numChars) {
            selLastChar = textPtr->numChars - 1;
        }
        if ((selFirstChar >= 0) && (selFirstChar <= selLastChar)) {
            int xFirst, yFirst, hFirst;
            int xLast, yLast;

            /*
             * Draw a special background under the selection.
             */

            Tk_CharBbox(textPtr->textLayout, selFirstChar, &xFirst, &yFirst,
                    NULL, &hFirst);
            Tk_CharBbox(textPtr->textLayout, selLastChar, &xLast, &yLast,
                    NULL, NULL);

            /*
             * If the selection spans the end of this line, then display
             * selection background all the way to the end of the line.
             * However, for the last line we only want to display up to the
             * last character, not the end of the line.
             */

            x = xFirst;
            height = hFirst;
            for (y = yFirst ; y <= yLast; y += height) {
                if (y == yLast) {
                    width = xLast - x;
                } else {            
                    width = textPtr->rightEdge - textPtr->leftEdge - x;
                }
                Tk_CanvasDrawableCoords(canvas,
                        (double) (textPtr->leftEdge + x
                                - textInfoPtr->selBorderWidth),
                        (double) (textPtr->header.y1 + y),
                        &drawableX, &drawableY);
                Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
                        textInfoPtr->selBorder, drawableX, drawableY,
                        width + 2 * textInfoPtr->selBorderWidth,
                        height, textInfoPtr->selBorderWidth, TK_RELIEF_RAISED);
                x = 0;
            }
        }
    }

    /*
     * If the insertion point should be displayed, then draw a special
     * background for the cursor before drawing the text.  Note:  if
     * we're the cursor item but the cursor is turned off, then redraw
     * background over the area of the cursor.  This guarantees that
     * the selection won't make the cursor invisible on mono displays,
     * where both are drawn in the same color.
     */

    if ((textInfoPtr->focusItemPtr == itemPtr) && (textInfoPtr->gotFocus)) {
        if (Tk_CharBbox(textPtr->textLayout, textPtr->insertPos,
                &x, &y, NULL, &height)) {
            Tk_CanvasDrawableCoords(canvas,
                    (double) (textPtr->leftEdge + x
                            - (textInfoPtr->insertWidth / 2)),
                    (double) (textPtr->header.y1 + y),
                    &drawableX, &drawableY);
            if (textInfoPtr->cursorOn) {
                Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
                        textInfoPtr->insertBorder,
                        drawableX, drawableY,
                        textInfoPtr->insertWidth, height,
                        textInfoPtr->insertBorderWidth, TK_RELIEF_RAISED);
            } else if (textPtr->cursorOffGC != None) {
                /*
                 * Redraw the background over the area of the cursor,
                 * even though the cursor is turned off.  This
                 * guarantees that the selection won't make the cursor
                 * invisible on mono displays, where both may be drawn
                 * in the same color.
                 */

                XFillRectangle(display, drawable, textPtr->cursorOffGC,
                        drawableX, drawableY,
                        (unsigned) textInfoPtr->insertWidth,
                        (unsigned) height);
            }
        }
    }


    /*
     * Display the text in two pieces: draw the entire text item, then
     * draw the selected text on top of it.  The selected text then
     * will only need to be drawn if it has different attributes (such
     * as foreground color) than regular text.
     */

    Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge,
            (double) textPtr->header.y1, &drawableX, &drawableY);
    Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
            drawableX, drawableY, 0, -1);

    if ((selFirstChar >= 0) && (textPtr->selTextGC != textPtr->gc)) {
        Tk_DrawTextLayout(display, drawable, textPtr->selTextGC,
            textPtr->textLayout, drawableX, drawableY, selFirstChar,
            selLastChar + 1);
    }

    if (stipple != None) {
        XSetTSOrigin(display, textPtr->gc, 0, 0);
    }
}

/*
 *--------------------------------------------------------------
 *
 * TextInsert --
 *
 *      Insert characters into a text item at a given position.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The text in the given item is modified.  The cursor and
 *      selection positions are also modified to reflect the
 *      insertion.
 *
 *--------------------------------------------------------------
 */

static void
TextInsert(canvas, itemPtr, index, string)
    Tk_Canvas canvas;           /* Canvas containing text item. */
    Tk_Item *itemPtr;           /* Text item to be modified. */
    int index;                  /* Character index before which string is
                                 * to be inserted. */
    char *string;               /* New characters to be inserted. */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    int byteIndex, byteCount, charsAdded;
    char *new, *text;
    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;

    string = Tcl_GetStringFromObj((Tcl_Obj *) string, &byteCount);

    text = textPtr->text;

    if (index < 0) {
        index = 0;
    }
    if (index > textPtr->numChars) {
        index = textPtr->numChars;
    }
    byteIndex = Tcl_UtfAtIndex(text, index) - text;
    byteCount = strlen(string);
    if (byteCount == 0) {
        return;
    }

    new = (char *) ckalloc((unsigned) textPtr->numBytes + byteCount + 1);
    memcpy(new, text, (size_t) byteIndex);
    strcpy(new + byteIndex, string);
    strcpy(new + byteIndex + byteCount, text + byteIndex);

    ckfree(text);
    textPtr->text = new;
    charsAdded = Tcl_NumUtfChars(string, byteCount);
    textPtr->numChars += charsAdded;
    textPtr->numBytes += byteCount;

    /*
     * Inserting characters invalidates indices such as those for the
     * selection and cursor.  Update the indices appropriately.
     */

    if (textInfoPtr->selItemPtr == itemPtr) {
        if (textInfoPtr->selectFirst >= index) {
            textInfoPtr->selectFirst += charsAdded;
        }
        if (textInfoPtr->selectLast >= index) {
            textInfoPtr->selectLast += charsAdded;
        }
        if ((textInfoPtr->anchorItemPtr == itemPtr)
                && (textInfoPtr->selectAnchor >= index)) {
            textInfoPtr->selectAnchor += charsAdded;
        }
    }
    if (textPtr->insertPos >= index) {
        textPtr->insertPos += charsAdded;
    }
    ComputeTextBbox(canvas, textPtr);
}

/*
 *--------------------------------------------------------------
 *
 * TextDeleteChars --
 *
 *      Delete one or more characters from a text item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Characters between "first" and "last", inclusive, get
 *      deleted from itemPtr, and things like the selection
 *      position get updated.
 *
 *--------------------------------------------------------------
 */

static void
TextDeleteChars(canvas, itemPtr, first, last)
    Tk_Canvas canvas;           /* Canvas containing itemPtr. */
    Tk_Item *itemPtr;           /* Item in which to delete characters. */
    int first;                  /* Character index of first character to
                                 * delete. */
    int last;                   /* Character index of last character to
                                 * delete (inclusive). */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    int byteIndex, byteCount, charsRemoved;
    char *new, *text;
    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;

    text = textPtr->text;
    if (first < 0) {
        first = 0;
    }
    if (last >= textPtr->numChars) {
        last = textPtr->numChars - 1;
    }
    if (first > last) {
        return;
    }
    charsRemoved = last + 1 - first;

    byteIndex = Tcl_UtfAtIndex(text, first) - text;
    byteCount = Tcl_UtfAtIndex(text + byteIndex, charsRemoved)
        - (text + byteIndex);
    
    new = (char *) ckalloc((unsigned) (textPtr->numBytes + 1 - byteCount));
    memcpy(new, text, (size_t) byteIndex);
    strcpy(new + byteIndex, text + byteIndex + byteCount);

    ckfree(text);
    textPtr->text = new;
    textPtr->numChars -= charsRemoved;
    textPtr->numBytes -= byteCount;

    /*
     * Update indexes for the selection and cursor to reflect the
     * renumbering of the remaining characters.
     */

    if (textInfoPtr->selItemPtr == itemPtr) {
        if (textInfoPtr->selectFirst > first) {
            textInfoPtr->selectFirst -= charsRemoved;
            if (textInfoPtr->selectFirst < first) {
                textInfoPtr->selectFirst = first;
            }
        }
        if (textInfoPtr->selectLast >= first) {
            textInfoPtr->selectLast -= charsRemoved;
            if (textInfoPtr->selectLast < first - 1) {
                textInfoPtr->selectLast = first - 1;
            }
        }
        if (textInfoPtr->selectFirst > textInfoPtr->selectLast) {
            textInfoPtr->selItemPtr = NULL;
        }
        if ((textInfoPtr->anchorItemPtr == itemPtr)
                && (textInfoPtr->selectAnchor > first)) {
            textInfoPtr->selectAnchor -= charsRemoved;
            if (textInfoPtr->selectAnchor < first) {
                textInfoPtr->selectAnchor = first;
            }
        }
    }
    if (textPtr->insertPos > first) {
        textPtr->insertPos -= charsRemoved;
        if (textPtr->insertPos < first) {
            textPtr->insertPos = first;
        }
    }
    ComputeTextBbox(canvas, textPtr);
    return;
}

/*
 *--------------------------------------------------------------
 *
 * TextToPoint --
 *
 *      Computes the distance from a given point to a given
 *      text item, in canvas units.
 *
 * Results:
 *      The return value is 0 if the point whose x and y coordinates
 *      are pointPtr[0] and pointPtr[1] is inside the text item.  If
 *      the point isn't inside the text item then the return value
 *      is the distance from the point to the text item.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static double
TextToPoint(canvas, itemPtr, pointPtr)
    Tk_Canvas canvas;           /* Canvas containing itemPtr. */
    Tk_Item *itemPtr;           /* Item to check against point. */
    double *pointPtr;           /* Pointer to x and y coordinates. */
{
    TextItem *textPtr;
    Tk_State state = itemPtr->state;
    double value;

    if (state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    textPtr = (TextItem *) itemPtr;
    value =  (double) Tk_DistanceToTextLayout(textPtr->textLayout,
            (int) pointPtr[0] - textPtr->leftEdge,
            (int) pointPtr[1] - textPtr->header.y1);

    if ((state == TK_STATE_HIDDEN) || (textPtr->color == NULL) ||
            (textPtr->text == NULL) || (*textPtr->text == 0)) {
        value = 1.0e36;
    }
    return value;
}

/*
 *--------------------------------------------------------------
 *
 * TextToArea --
 *
 *      This procedure is called to determine whether an item
 *      lies entirely inside, entirely outside, or overlapping
 *      a given rectangle.
 *
 * Results:
 *      -1 is returned if the item is entirely outside the area
 *      given by rectPtr, 0 if it overlaps, and 1 if it is entirely
 *      inside the given area.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static int
TextToArea(canvas, itemPtr, rectPtr)
    Tk_Canvas canvas;           /* Canvas containing itemPtr. */
    Tk_Item *itemPtr;           /* Item to check against rectangle. */
    double *rectPtr;            /* Pointer to array of four coordinates
                                 * (x1, y1, x2, y2) describing rectangular
                                 * area.  */
{
    TextItem *textPtr;
    Tk_State state = itemPtr->state;

    if (state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }

    textPtr = (TextItem *) itemPtr;
    return Tk_IntersectTextLayout(textPtr->textLayout,
            (int) (rectPtr[0] + 0.5) - textPtr->leftEdge,
            (int) (rectPtr[1] + 0.5) - textPtr->header.y1,
            (int) (rectPtr[2] - rectPtr[0] + 0.5),
            (int) (rectPtr[3] - rectPtr[1] + 0.5));
}

/*
 *--------------------------------------------------------------
 *
 * ScaleText --
 *
 *      This procedure is invoked to rescale a text item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Scales the position of the text, but not the size
 *      of the font for the text.
 *
 *--------------------------------------------------------------
 */

        /* ARGSUSED */
static void
ScaleText(canvas, itemPtr, originX, originY, scaleX, scaleY)
    Tk_Canvas canvas;           /* Canvas containing rectangle. */
    Tk_Item *itemPtr;           /* Rectangle to be scaled. */
    double originX, originY;    /* Origin about which to scale rect. */
    double scaleX;              /* Amount to scale in X direction. */
    double scaleY;              /* Amount to scale in Y direction. */
{
    TextItem *textPtr = (TextItem *) itemPtr;

    textPtr->x = originX + scaleX*(textPtr->x - originX);
    textPtr->y = originY + scaleY*(textPtr->y - originY);
    ComputeTextBbox(canvas, textPtr);
    return;
}

/*
 *--------------------------------------------------------------
 *
 * TranslateText --
 *
 *      This procedure is called to move a text item by a
 *      given amount.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The position of the text item is offset by (xDelta, yDelta),
 *      and the bounding box is updated in the generic part of the
 *      item structure.
 *
 *--------------------------------------------------------------
 */

static void
TranslateText(canvas, itemPtr, deltaX, deltaY)
    Tk_Canvas canvas;           /* Canvas containing item. */
    Tk_Item *itemPtr;           /* Item that is being moved. */
    double deltaX, deltaY;      /* Amount by which item is to be moved. */
{
    TextItem *textPtr = (TextItem *) itemPtr;

    textPtr->x += deltaX;
    textPtr->y += deltaY;
    ComputeTextBbox(canvas, textPtr);
}

/*
 *--------------------------------------------------------------
 *
 * GetTextIndex --
 *
 *      Parse an index into a text item 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 itemPtr) corresponding to
 *      string.  Otherwise an error message is left in
 *      the interp's result.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static int
GetTextIndex(interp, canvas, itemPtr, obj, indexPtr)
    Tcl_Interp *interp;         /* Used for error reporting. */
    Tk_Canvas canvas;           /* Canvas containing item. */
    Tk_Item *itemPtr;           /* Item for which the index is being
                                 * specified. */
    Tcl_Obj *obj;               /* Specification of a particular character
                                 * in itemPtr's text. */
    int *indexPtr;              /* Where to store converted character
                                 * index. */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    size_t length;
    int c;
    TkCanvas *canvasPtr = (TkCanvas *) canvas;
    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
    char *string = Tcl_GetStringFromObj(obj, (int *) &length);

    c = string[0];
    length = strlen(string);

    if ((c == 'e') && (strncmp(string, "end", length) == 0)) {
        *indexPtr = textPtr->numChars;
    } else if ((c == 'i') && (strncmp(string, "insert", length) == 0)) {
        *indexPtr = textPtr->insertPos;
    } else if ((c == 's') && (strncmp(string, "sel.first", length) == 0)
            && (length >= 5)) {
        if (textInfoPtr->selItemPtr != itemPtr) {
            Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
            return TCL_ERROR;
        }
        *indexPtr = textInfoPtr->selectFirst;
    } else if ((c == 's') && (strncmp(string, "sel.last", length) == 0)
            && (length >= 5)) {
        if (textInfoPtr->selItemPtr != itemPtr) {
            Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
            return TCL_ERROR;
        }
        *indexPtr = textInfoPtr->selectLast;
    } else if (c == '@') {
        int x, y;
        double tmp;
        char *end, *p;

        p = string+1;
        tmp = strtod(p, &end);
        if ((end == p) || (*end != ',')) {
            goto badIndex;
        }
        x = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
        p = end+1;
        tmp = strtod(p, &end);
        if ((end == p) || (*end != 0)) {
            goto badIndex;
        }
        y = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
        *indexPtr = Tk_PointToChar(textPtr->textLayout,
                x + canvasPtr->scrollX1 - textPtr->leftEdge,
                y + canvasPtr->scrollY1 - textPtr->header.y1);
    } else if (Tcl_GetIntFromObj((Tcl_Interp *)NULL, obj, indexPtr) == TCL_OK) {
        if (*indexPtr < 0){
            *indexPtr = 0;
        } else if (*indexPtr > textPtr->numChars) {
            *indexPtr = textPtr->numChars;
        }
    } else {
        /*
         * Some of the paths here leave messages in the interp's result,
         * so we have to clear it out before storing our own message.
         */

        badIndex:
        Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
        Tcl_AppendResult(interp, "bad index \"", string, "\"",
                (char *) NULL);
        return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * SetTextCursor --
 *
 *      Set the position of the insertion cursor in this item.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The cursor position will change.
 *
 *--------------------------------------------------------------
 */

        /* ARGSUSED */
static void
SetTextCursor(canvas, itemPtr, index)
    Tk_Canvas canvas;           /* Record describing canvas widget. */
    Tk_Item *itemPtr;           /* Text item in which cursor position is to
                                 * be set. */
    int index;                  /* Character index of character just before
                                 * which cursor is to be positioned. */
{
    TextItem *textPtr = (TextItem *) itemPtr;

    if (index < 0) {
        textPtr->insertPos = 0;
    } else  if (index > textPtr->numChars) {
        textPtr->insertPos = textPtr->numChars;
    } else {
        textPtr->insertPos = index;
    }
}

/*
 *--------------------------------------------------------------
 *
 * GetSelText --
 *
 *      This procedure is invoked to return the selected portion
 *      of a text item.  It is only called when this item has
 *      the selection.
 *
 * 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
GetSelText(canvas, itemPtr, offset, buffer, maxBytes)
    Tk_Canvas canvas;           /* Canvas containing selection. */
    Tk_Item *itemPtr;           /* Text item containing selection. */
    int offset;                 /* Byte 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. */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    int byteCount; 
    char *text, *selStart, *selEnd;
    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;

    if ((textInfoPtr->selectFirst < 0) ||
            (textInfoPtr->selectFirst > textInfoPtr->selectLast)) {
        return 0;
    }
    text = textPtr->text;
    selStart = Tcl_UtfAtIndex(text, textInfoPtr->selectFirst);
    selEnd = Tcl_UtfAtIndex(selStart,
            textInfoPtr->selectLast + 1 - textInfoPtr->selectFirst);
    byteCount = selEnd - selStart - offset;
    if (byteCount > maxBytes) {
        byteCount = maxBytes;
    }
    if (byteCount <= 0) {
        return 0;
    }
    memcpy(buffer, selStart + offset, (size_t) byteCount);
    buffer[byteCount] = '\0';
    return byteCount;
}

/*
 *--------------------------------------------------------------
 *
 * TextToPostscript --
 *
 *      This procedure is called to generate Postscript for
 *      text items.
 *
 * Results:
 *      The return value is a standard Tcl result.  If an error
 *      occurs in generating Postscript then an error message is
 *      left in the interp's result, replacing whatever used
 *      to be there.  If no error occurs, then Postscript for the
 *      item is appended to the result.
 *
 * Side effects:
 *      None.
 *
 *--------------------------------------------------------------
 */

static int
TextToPostscript(interp, canvas, itemPtr, prepass)
    Tcl_Interp *interp;         /* Leave Postscript or error message here. */
    Tk_Canvas canvas;           /* Information about overall canvas. */
    Tk_Item *itemPtr;           /* Item for which Postscript is wanted. */
    int prepass;                /* 1 means this is a prepass to collect
                                 * font information; 0 means final Postscript
                                 * is being created. */
{
    TextItem *textPtr = (TextItem *) itemPtr;
    int x, y;
    Tk_FontMetrics fm;
    char *justify;
    char buffer[500];
    XColor *color;
    Pixmap stipple;
    Tk_State state = itemPtr->state;

    if(state == TK_STATE_NULL) {
        state = ((TkCanvas *)canvas)->canvas_state;
    }
    color = textPtr->color;
    stipple = textPtr->stipple;
    if (state == TK_STATE_HIDDEN || textPtr->color == NULL ||
            textPtr->text == NULL || *textPtr->text == 0) {
        return TCL_OK;
    } else if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) {
        if (textPtr->activeColor!=NULL) {
            color = textPtr->activeColor;
        }
        if (textPtr->activeStipple!=None) {
            stipple = textPtr->activeStipple;
        }
    } else if (state==TK_STATE_DISABLED) {
        if (textPtr->disabledColor!=NULL) {
            color = textPtr->disabledColor;
        }
        if (textPtr->disabledStipple!=None) {
            stipple = textPtr->disabledStipple;
        }
    }

    if (Tk_CanvasPsFont(interp, canvas, textPtr->tkfont) != TCL_OK) {
        return TCL_ERROR;
    }
    if (prepass != 0) {
        return TCL_OK;
    }
    if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
        return TCL_ERROR;
    }
    if (stipple != None) {
        Tcl_AppendResult(interp, "/StippleText {\n    ",
                (char *) NULL);
        Tk_CanvasPsStipple(interp, canvas, stipple);
        Tcl_AppendResult(interp, "} bind def\n", (char *) NULL);
    }

    sprintf(buffer, "%.15g %.15g [\n", textPtr->x,
            Tk_CanvasPsY(canvas, textPtr->y));
    Tcl_AppendResult(interp, buffer, (char *) NULL);

    Tk_TextLayoutToPostscript(interp, textPtr->textLayout);

    x = 0;  y = 0;  justify = NULL;     /* lint. */
    switch (textPtr->anchor) {
        case TK_ANCHOR_NW:      x = 0; y = 0;   break;
        case TK_ANCHOR_N:       x = 1; y = 0;   break;
        case TK_ANCHOR_NE:      x = 2; y = 0;   break;
        case TK_ANCHOR_E:       x = 2; y = 1;   break;
        case TK_ANCHOR_SE:      x = 2; y = 2;   break;
        case TK_ANCHOR_S:       x = 1; y = 2;   break;
        case TK_ANCHOR_SW:      x = 0; y = 2;   break;
        case TK_ANCHOR_W:       x = 0; y = 1;   break;
        case TK_ANCHOR_CENTER:  x = 1; y = 1;   break;
    }
    switch (textPtr->justify) {
        case TK_JUSTIFY_LEFT:   justify = "0";  break;
        case TK_JUSTIFY_CENTER: justify = "0.5";break;
        case TK_JUSTIFY_RIGHT:  justify = "1";  break;
    }

    Tk_GetFontMetrics(textPtr->tkfont, &fm);
    sprintf(buffer, "] %d %g %g %s %s DrawText\n",
            fm.linespace, x / -2.0, y / 2.0, justify,
            ((stipple == None) ? "false" : "true"));
    Tcl_AppendResult(interp, buffer, (char *) NULL);

    return TCL_OK;
}


/* $History: tkCanvText.c $
 * 
 * *****************  Version 1  *****************
 * User: Dtashley     Date: 1/02/01    Time: 2:42a
 * Created in $/IjuScripter, IjuConsole/Source/Tk Base
 * Initial check-in.
 */

/* End of TKCANVTEXT.C */