fix crlf line endings

FossilOrigin-Name: 69e14e890411588941a77cb07527cc0ed2a07582

1 files changed, 1517 insertions, 1517 deletions

diff --git a/generic/tkCanvText.c b/generic/tkCanvText.c
index 8da2fe1..5e7c400 100644
--- a/generic/tkCanvText.c
+++ b/generic/tkCanvText.c
@@ -1,1517 +1,1517 @@
-/*

- * 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 1.22 2007/02/12 21:41:47 dkf 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. */

-    int underline;		/* Index of character to put underline beneath

-				 * or -1 for no underlining. */

-

-    /*

-     * 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", NULL, NULL,

-	NULL, Tk_Offset(TextItem, activeColor), TK_CONFIG_NULL_OK},

-    {TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,

-	NULL, Tk_Offset(TextItem, activeStipple), TK_CONFIG_NULL_OK},

-    {TK_CONFIG_ANCHOR, "-anchor", NULL, NULL,

-	"center", Tk_Offset(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},

-    {TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,

-	NULL, Tk_Offset(TextItem, disabledColor), TK_CONFIG_NULL_OK},

-    {TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,

-	NULL, Tk_Offset(TextItem, disabledStipple), TK_CONFIG_NULL_OK},

-    {TK_CONFIG_COLOR, "-fill", NULL, NULL,

-	"black", Tk_Offset(TextItem, color), TK_CONFIG_NULL_OK},

-    {TK_CONFIG_FONT, "-font", NULL, NULL,

-	DEF_CANVTEXT_FONT, Tk_Offset(TextItem, tkfont), 0},

-    {TK_CONFIG_JUSTIFY, "-justify", NULL, NULL,

-	"left", Tk_Offset(TextItem, justify), TK_CONFIG_DONT_SET_DEFAULT},

-    {TK_CONFIG_CUSTOM, "-offset", NULL, NULL,

-	"0,0", Tk_Offset(TextItem, tsoffset),

-	TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},

-    {TK_CONFIG_CUSTOM, "-state", NULL, NULL,

-	NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},

-    {TK_CONFIG_BITMAP, "-stipple", NULL, NULL,

-	NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK},

-    {TK_CONFIG_CUSTOM, "-tags", NULL, NULL,

-	NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},

-    {TK_CONFIG_STRING, "-text", NULL, NULL,

-	"", Tk_Offset(TextItem, text), 0},

-    {TK_CONFIG_INT, "-underline", NULL, NULL,

-	"-1", Tk_Offset(TextItem, underline), 0},

-    {TK_CONFIG_PIXELS, "-width", NULL, NULL,

-	"0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT},

-    {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}

-};

-

-/*

- * Prototypes for functions defined in this file:

- */

-

-static void		ComputeTextBbox(Tk_Canvas canvas, TextItem *textPtr);

-static int		ConfigureText(Tcl_Interp *interp,

-			    Tk_Canvas canvas, Tk_Item *itemPtr, int argc,

-			    Tcl_Obj *CONST objv[], int flags);

-static int		CreateText(Tcl_Interp *interp,

-			    Tk_Canvas canvas, struct Tk_Item *itemPtr,

-			    int argc, Tcl_Obj *CONST objv[]);

-static void		DeleteText(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, Display *display);

-static void		DisplayCanvText(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, Display *display, Drawable dst,

-			    int x, int y, int width, int height);

-static int		GetSelText(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, int offset, char *buffer,

-			    int maxBytes);

-static int		GetTextIndex(Tcl_Interp *interp,

-			    Tk_Canvas canvas, Tk_Item *itemPtr,

-			    Tcl_Obj *obj, int *indexPtr);

-static void		ScaleText(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, double originX, double originY,

-			    double scaleX, double scaleY);

-static void		SetTextCursor(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, int index);

-static int		TextCoords(Tcl_Interp *interp,

-			    Tk_Canvas canvas, Tk_Item *itemPtr,

-			    int argc, Tcl_Obj *CONST objv[]);

-static void		TextDeleteChars(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, int first, int last);

-static void		TextInsert(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, int beforeThis, char *string);

-static int		TextToArea(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, double *rectPtr);

-static double		TextToPoint(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, double *pointPtr);

-static int		TextToPostscript(Tcl_Interp *interp,

-			    Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);

-static void		TranslateText(Tk_Canvas canvas,

-			    Tk_Item *itemPtr, double deltaX, double deltaY);

-

-/*

- * The structures below defines the rectangle and oval item types by means of

- * functions 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 */

-    NULL,			/* nextPtr */

-};

-

-/*

- *--------------------------------------------------------------

- *

- * CreateText --

- *

- *	This function 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(

-    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 objc,			/* Number of arguments in objv. */

-    Tcl_Obj *CONST objv[])	/* Arguments describing rectangle. */

-{

-    TextItem *textPtr = (TextItem *) itemPtr;

-    int i;

-

-    if (objc == 0) {

-	Tcl_Panic("canvas did not pass any coords\n");

-    }

-

-    /*

-     * Carry out initialization that is needed in order to clean up after

-     * errors during the the remainder of this function.

-     */

-

-    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->underline	= -1;

-

-    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. Only 1 (list) or 2 (x

-     * y) coords are allowed.

-     */

-

-    if (objc == 1) {

-	i = 1;

-    } else {

-	char *arg = Tcl_GetString(objv[1]);

-

-	i = 2;

-	if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {

-	    i = 1;

-	}

-    }

-    if ((TextCoords(interp, canvas, itemPtr, i, objv) != TCL_OK)) {

-	goto error;

-    }

-    if (ConfigureText(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {

-	return TCL_OK;

-    }

-

-  error:

-    DeleteText(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));

-    return TCL_ERROR;

-}

-

-/*

- *--------------------------------------------------------------

- *

- * TextCoords --

- *

- *	This function 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(

-    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 objc,			/* Number of coordinates supplied in objv. */

-    Tcl_Obj *CONST objv[])	/* Array of coordinates: x1, y1, x2, y2, ... */

-{

-    TextItem *textPtr = (TextItem *) itemPtr;

-

-    if (objc == 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 (objc < 3) {

-	if (objc==1) {

-	    if (Tcl_ListObjGetElements(interp, objv[0], &objc,

-		    (Tcl_Obj ***) &objv) != TCL_OK) {

-		return TCL_ERROR;

-	    } else if (objc != 2) {

-		char buf[64 + TCL_INTEGER_SPACE];

-

-		sprintf(buf, "wrong # coordinates: expected 2, got %d", objc);

-		Tcl_SetResult(interp, buf, TCL_VOLATILE);

-		return TCL_ERROR;

-	    }

-	}

-	if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],

-		    &textPtr->x) != TCL_OK)

-		|| (Tk_CanvasGetCoordFromObj(interp, canvas, objv[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", objc);

-	Tcl_SetResult(interp, buf, TCL_VOLATILE);

-	return TCL_ERROR;

-    }

-    return TCL_OK;

-}

-

-/*

- *--------------------------------------------------------------

- *

- * ConfigureText --

- *

- *	This function 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(

-    Tcl_Interp *interp,		/* Interpreter for error reporting. */

-    Tk_Canvas canvas,		/* Canvas containing itemPtr. */

-    Tk_Item *itemPtr,		/* Rectangle item to reconfigure. */

-    int objc,			/* Number of elements in objv. */

-    Tcl_Obj *CONST objv[],	/* 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 (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,

-	    (CONST char **) objv, (char *) textPtr, flags|TK_CONFIG_OBJS)) {

-	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 function 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(

-    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 function 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(

-    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) floor(textPtr->x + 0.5);

-    topY = (int) floor(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 function 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(

-    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, int y, int width, int 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, wLast;

-

-	    /*

-	     * Draw a special background under the selection.

-	     */

-

-	    Tk_CharBbox(textPtr->textLayout, selFirstChar, &xFirst, &yFirst,

-		    NULL, &hFirst);

-	    Tk_CharBbox(textPtr->textLayout, selLastChar, &xLast, &yLast,

-		    &wLast, 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 + wLast - 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);

-	    Tk_SetCaretPos(Tk_CanvasTkwin(canvas), drawableX, drawableY,

-		    height);

-	    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);

-	    }

-	}

-    }

-

-    /*

-     * If there is no selected text or the selected text foreground is the

-     * same as the regular text foreground, then draw one text string. If

-     * there is selected text and the foregrounds differ, draw the regular

-     * text up to the selection, draw the selection, then draw the rest of the

-     * regular text. Drawing the regular text and then the selected text over

-     * it would causes problems with anti-aliased text because the two

-     * anti-aliasing colors would blend together.

-     */

-

-    Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge,

-	    (double) textPtr->header.y1, &drawableX, &drawableY);

-

-    if ((selFirstChar >= 0) && (textPtr->selTextGC != textPtr->gc)) {

-	Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,

-	    drawableX, drawableY, 0, selFirstChar);

-	Tk_DrawTextLayout(display, drawable, textPtr->selTextGC,

-	    textPtr->textLayout, drawableX, drawableY, selFirstChar,

-	    selLastChar + 1);

-	Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,

-	    drawableX, drawableY, selLastChar + 1, -1);

-    } else {

-	Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,

-	    drawableX, drawableY, 0, -1);

-    }

-    Tk_UnderlineTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,

-	    drawableX, drawableY, textPtr->underline);

-

-    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(

-    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 *newStr, *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;

-    }

-

-    newStr = (char *) ckalloc((unsigned) textPtr->numBytes + byteCount + 1);

-    memcpy(newStr, text, (size_t) byteIndex);

-    strcpy(newStr + byteIndex, string);

-    strcpy(newStr + byteIndex + byteCount, text + byteIndex);

-

-    ckfree(text);

-    textPtr->text = newStr;

-    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(

-    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 *newStr, *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);

-

-    newStr = (char *) ckalloc((unsigned) (textPtr->numBytes + 1 - byteCount));

-    memcpy(newStr, text, (size_t) byteIndex);

-    strcpy(newStr + byteIndex, text + byteIndex + byteCount);

-

-    ckfree(text);

-    textPtr->text = newStr;

-    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(

-    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 function 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(

-    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 function 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(

-    Tk_Canvas canvas,		/* Canvas containing rectangle. */

-    Tk_Item *itemPtr,		/* Rectangle to be scaled. */

-    double originX, double 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 function 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(

-    Tk_Canvas canvas,		/* Canvas containing item. */

-    Tk_Item *itemPtr,		/* Item that is being moved. */

-    double deltaX, double 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(

-    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;

-    int length;

-    int c;

-    TkCanvas *canvasPtr = (TkCanvas *) canvas;

-    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;

-    char *string = Tcl_GetStringFromObj(obj, &length);

-

-    c = string[0];

-

-    if ((c == 'e') && (strncmp(string, "end", (unsigned) length) == 0)) {

-	*indexPtr = textPtr->numChars;

-    } else if ((c == 'i')

-	    && (strncmp(string, "insert", (unsigned) length) == 0)) {

-	*indexPtr = textPtr->insertPos;

-    } else if ((c == 's') && (length >= 5)

-	    && (strncmp(string, "sel.first", (unsigned) length) == 0)) {

-	if (textInfoPtr->selItemPtr != itemPtr) {

-	    Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);

-	    return TCL_ERROR;

-	}

-	*indexPtr = textInfoPtr->selectFirst;

-    } else if ((c == 's') && (length >= 5)

-	    && (strncmp(string, "sel.last", (unsigned) length) == 0)) {

-	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(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, NULL, TCL_STATIC);

-	Tcl_AppendResult(interp, "bad index \"", string, "\"", 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(

-    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 function 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(

-    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;

-    CONST char *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 function 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(

-    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    ", NULL);

-	Tk_CanvasPsStipple(interp, canvas, stipple);

-	Tcl_AppendResult(interp, "} bind def\n", NULL);

-    }

-

-    sprintf(buffer, "%.15g %.15g [\n", textPtr->x,

-	    Tk_CanvasPsY(canvas, textPtr->y));

-    Tcl_AppendResult(interp, buffer, 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, NULL);

-

-    return TCL_OK;

-}

-

-/*

- * Local Variables:

- * mode: c

- * c-basic-offset: 4

- * fill-column: 78

- * End:

- */

+/*
+ * 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 1.23 2007/02/13 11:29:17 das 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. */
+    int underline;		/* Index of character to put underline beneath
+				 * or -1 for no underlining. */
+
+    /*
+     * 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", NULL, NULL,
+	NULL, Tk_Offset(TextItem, activeColor), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,
+	NULL, Tk_Offset(TextItem, activeStipple), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_ANCHOR, "-anchor", NULL, NULL,
+	"center", Tk_Offset(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
+	NULL, Tk_Offset(TextItem, disabledColor), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
+	NULL, Tk_Offset(TextItem, disabledStipple), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_COLOR, "-fill", NULL, NULL,
+	"black", Tk_Offset(TextItem, color), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_FONT, "-font", NULL, NULL,
+	DEF_CANVTEXT_FONT, Tk_Offset(TextItem, tkfont), 0},
+    {TK_CONFIG_JUSTIFY, "-justify", NULL, NULL,
+	"left", Tk_Offset(TextItem, justify), TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_CUSTOM, "-offset", NULL, NULL,
+	"0,0", Tk_Offset(TextItem, tsoffset),
+	TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
+    {TK_CONFIG_CUSTOM, "-state", NULL, NULL,
+	NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},
+    {TK_CONFIG_BITMAP, "-stipple", NULL, NULL,
+	NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK},
+    {TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
+	NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
+    {TK_CONFIG_STRING, "-text", NULL, NULL,
+	"", Tk_Offset(TextItem, text), 0},
+    {TK_CONFIG_INT, "-underline", NULL, NULL,
+	"-1", Tk_Offset(TextItem, underline), 0},
+    {TK_CONFIG_PIXELS, "-width", NULL, NULL,
+	"0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT},
+    {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
+};
+
+/*
+ * Prototypes for functions defined in this file:
+ */
+
+static void		ComputeTextBbox(Tk_Canvas canvas, TextItem *textPtr);
+static int		ConfigureText(Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
+			    Tcl_Obj *CONST objv[], int flags);
+static int		CreateText(Tcl_Interp *interp,
+			    Tk_Canvas canvas, struct Tk_Item *itemPtr,
+			    int argc, Tcl_Obj *CONST objv[]);
+static void		DeleteText(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, Display *display);
+static void		DisplayCanvText(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, Display *display, Drawable dst,
+			    int x, int y, int width, int height);
+static int		GetSelText(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, int offset, char *buffer,
+			    int maxBytes);
+static int		GetTextIndex(Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr,
+			    Tcl_Obj *obj, int *indexPtr);
+static void		ScaleText(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double originX, double originY,
+			    double scaleX, double scaleY);
+static void		SetTextCursor(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, int index);
+static int		TextCoords(Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr,
+			    int argc, Tcl_Obj *CONST objv[]);
+static void		TextDeleteChars(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, int first, int last);
+static void		TextInsert(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, int beforeThis, char *string);
+static int		TextToArea(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double *rectPtr);
+static double		TextToPoint(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double *pointPtr);
+static int		TextToPostscript(Tcl_Interp *interp,
+			    Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
+static void		TranslateText(Tk_Canvas canvas,
+			    Tk_Item *itemPtr, double deltaX, double deltaY);
+
+/*
+ * The structures below defines the rectangle and oval item types by means of
+ * functions 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 */
+    NULL,			/* nextPtr */
+};
+
+/*
+ *--------------------------------------------------------------
+ *
+ * CreateText --
+ *
+ *	This function 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(
+    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 objc,			/* Number of arguments in objv. */
+    Tcl_Obj *CONST objv[])	/* Arguments describing rectangle. */
+{
+    TextItem *textPtr = (TextItem *) itemPtr;
+    int i;
+
+    if (objc == 0) {
+	Tcl_Panic("canvas did not pass any coords\n");
+    }
+
+    /*
+     * Carry out initialization that is needed in order to clean up after
+     * errors during the the remainder of this function.
+     */
+
+    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->underline	= -1;
+
+    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. Only 1 (list) or 2 (x
+     * y) coords are allowed.
+     */
+
+    if (objc == 1) {
+	i = 1;
+    } else {
+	char *arg = Tcl_GetString(objv[1]);
+
+	i = 2;
+	if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
+	    i = 1;
+	}
+    }
+    if ((TextCoords(interp, canvas, itemPtr, i, objv) != TCL_OK)) {
+	goto error;
+    }
+    if (ConfigureText(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
+	return TCL_OK;
+    }
+
+  error:
+    DeleteText(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
+    return TCL_ERROR;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * TextCoords --
+ *
+ *	This function 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(
+    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 objc,			/* Number of coordinates supplied in objv. */
+    Tcl_Obj *CONST objv[])	/* Array of coordinates: x1, y1, x2, y2, ... */
+{
+    TextItem *textPtr = (TextItem *) itemPtr;
+
+    if (objc == 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 (objc < 3) {
+	if (objc==1) {
+	    if (Tcl_ListObjGetElements(interp, objv[0], &objc,
+		    (Tcl_Obj ***) &objv) != TCL_OK) {
+		return TCL_ERROR;
+	    } else if (objc != 2) {
+		char buf[64 + TCL_INTEGER_SPACE];
+
+		sprintf(buf, "wrong # coordinates: expected 2, got %d", objc);
+		Tcl_SetResult(interp, buf, TCL_VOLATILE);
+		return TCL_ERROR;
+	    }
+	}
+	if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0],
+		    &textPtr->x) != TCL_OK)
+		|| (Tk_CanvasGetCoordFromObj(interp, canvas, objv[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", objc);
+	Tcl_SetResult(interp, buf, TCL_VOLATILE);
+	return TCL_ERROR;
+    }
+    return TCL_OK;
+}
+
+/*
+ *--------------------------------------------------------------
+ *
+ * ConfigureText --
+ *
+ *	This function 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(
+    Tcl_Interp *interp,		/* Interpreter for error reporting. */
+    Tk_Canvas canvas,		/* Canvas containing itemPtr. */
+    Tk_Item *itemPtr,		/* Rectangle item to reconfigure. */
+    int objc,			/* Number of elements in objv. */
+    Tcl_Obj *CONST objv[],	/* 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 (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
+	    (CONST char **) objv, (char *) textPtr, flags|TK_CONFIG_OBJS)) {
+	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 function 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(
+    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 function 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(
+    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) floor(textPtr->x + 0.5);
+    topY = (int) floor(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 function 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(
+    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, int y, int width, int 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, wLast;
+
+	    /*
+	     * Draw a special background under the selection.
+	     */
+
+	    Tk_CharBbox(textPtr->textLayout, selFirstChar, &xFirst, &yFirst,
+		    NULL, &hFirst);
+	    Tk_CharBbox(textPtr->textLayout, selLastChar, &xLast, &yLast,
+		    &wLast, 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 + wLast - 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);
+	    Tk_SetCaretPos(Tk_CanvasTkwin(canvas), drawableX, drawableY,
+		    height);
+	    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);
+	    }
+	}
+    }
+
+    /*
+     * If there is no selected text or the selected text foreground is the
+     * same as the regular text foreground, then draw one text string. If
+     * there is selected text and the foregrounds differ, draw the regular
+     * text up to the selection, draw the selection, then draw the rest of the
+     * regular text. Drawing the regular text and then the selected text over
+     * it would causes problems with anti-aliased text because the two
+     * anti-aliasing colors would blend together.
+     */
+
+    Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge,
+	    (double) textPtr->header.y1, &drawableX, &drawableY);
+
+    if ((selFirstChar >= 0) && (textPtr->selTextGC != textPtr->gc)) {
+	Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
+	    drawableX, drawableY, 0, selFirstChar);
+	Tk_DrawTextLayout(display, drawable, textPtr->selTextGC,
+	    textPtr->textLayout, drawableX, drawableY, selFirstChar,
+	    selLastChar + 1);
+	Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
+	    drawableX, drawableY, selLastChar + 1, -1);
+    } else {
+	Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
+	    drawableX, drawableY, 0, -1);
+    }
+    Tk_UnderlineTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
+	    drawableX, drawableY, textPtr->underline);
+
+    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(
+    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 *newStr, *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;
+    }
+
+    newStr = (char *) ckalloc((unsigned) textPtr->numBytes + byteCount + 1);
+    memcpy(newStr, text, (size_t) byteIndex);
+    strcpy(newStr + byteIndex, string);
+    strcpy(newStr + byteIndex + byteCount, text + byteIndex);
+
+    ckfree(text);
+    textPtr->text = newStr;
+    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(
+    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 *newStr, *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);
+
+    newStr = (char *) ckalloc((unsigned) (textPtr->numBytes + 1 - byteCount));
+    memcpy(newStr, text, (size_t) byteIndex);
+    strcpy(newStr + byteIndex, text + byteIndex + byteCount);
+
+    ckfree(text);
+    textPtr->text = newStr;
+    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(
+    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 function 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(
+    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 function 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(
+    Tk_Canvas canvas,		/* Canvas containing rectangle. */
+    Tk_Item *itemPtr,		/* Rectangle to be scaled. */
+    double originX, double 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 function 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(
+    Tk_Canvas canvas,		/* Canvas containing item. */
+    Tk_Item *itemPtr,		/* Item that is being moved. */
+    double deltaX, double 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(
+    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;
+    int length;
+    int c;
+    TkCanvas *canvasPtr = (TkCanvas *) canvas;
+    Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr;
+    char *string = Tcl_GetStringFromObj(obj, &length);
+
+    c = string[0];
+
+    if ((c == 'e') && (strncmp(string, "end", (unsigned) length) == 0)) {
+	*indexPtr = textPtr->numChars;
+    } else if ((c == 'i')
+	    && (strncmp(string, "insert", (unsigned) length) == 0)) {
+	*indexPtr = textPtr->insertPos;
+    } else if ((c == 's') && (length >= 5)
+	    && (strncmp(string, "sel.first", (unsigned) length) == 0)) {
+	if (textInfoPtr->selItemPtr != itemPtr) {
+	    Tcl_SetResult(interp, "selection isn't in item", TCL_STATIC);
+	    return TCL_ERROR;
+	}
+	*indexPtr = textInfoPtr->selectFirst;
+    } else if ((c == 's') && (length >= 5)
+	    && (strncmp(string, "sel.last", (unsigned) length) == 0)) {
+	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(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, NULL, TCL_STATIC);
+	Tcl_AppendResult(interp, "bad index \"", string, "\"", 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(
+    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 function 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(
+    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;
+    CONST char *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 function 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(
+    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    ", NULL);
+	Tk_CanvasPsStipple(interp, canvas, stipple);
+	Tcl_AppendResult(interp, "} bind def\n", NULL);
+    }
+
+    sprintf(buffer, "%.15g %.15g [\n", textPtr->x,
+	    Tk_CanvasPsY(canvas, textPtr->y));
+    Tcl_AppendResult(interp, buffer, 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, NULL);
+
+    return TCL_OK;
+}
+
+/*
+ * Local Variables:
+ * mode: c
+ * c-basic-offset: 4
+ * fill-column: 78
+ * End:
+ */