/*

* tkCanvText.c --

*

* This file implements text items for canvas widgets.

*

* Copyright © 1991-1994 The Regents of the University of California.

* Copyright © 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.

*/

#include "tkInt.h"

#include "tkCanvas.h"

#include "default.h"

#ifdef _WIN32

#include "tkWinInt.h"

#endif

/*

* 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. */

Tcl_Size 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. */

Tcl_Obj *textObj; /* Text for item (malloc-ed). */

Tcl_Obj *widthObj; /* Width of lines for word-wrap, pixels. Zero

* means no word-wrap. */

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

* or INT_MIN for no underlining. */

double angle; /* What angle, in degrees, to draw the text

* at. */

/*

* Fields whose values are derived from the current values of the

* configuration settings above.

*/

Tk_TextLayout textLayout; /* Cached text layout information. */

int actualWidth; /* Width of text as computed. Used to make

* selections of wrapped text display

* right. */

double drawOrigin[2]; /* Where we start drawing from. */

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. */

double sine; /* Sine of angle field. */

double cosine; /* Cosine of angle field. */

} TextItem;

/*

* Information used for parsing configuration specs:

*/

static const Tk_CustomOption stateOption = {

TkStateParseProc, TkStatePrintProc, INT2PTR(2)

};

static const Tk_CustomOption tagsOption = {

Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, NULL

};

static const Tk_CustomOption offsetOption = {

TkOffsetParseProc, TkOffsetPrintProc, INT2PTR(TK_OFFSET_RELATIVE)

};

static int

UnderlineParseProc(

TCL_UNUSED(void *), /* Not used.*/

Tcl_Interp *interp, /* Used for reporting errors. */

TCL_UNUSED(Tk_Window), /* Window containing canvas widget. */

const char *value, /* Value of option. */

char *widgRec, /* Pointer to record for item. */

Tcl_Size offset) /* Offset into item (ignored). */

{

int *underlinePtr = (int *) (widgRec + offset);

Tcl_Obj obj;

int code;

Tcl_Size underline;

if (value == NULL || *value == 0) {

*underlinePtr = INT_MIN; /* No underline */

return TCL_OK;

}

obj.refCount = 1;

obj.bytes = (char *)value;

obj.length = (Tcl_Size)strlen(value);

obj.typePtr = NULL;

code = TkGetIntForIndex(&obj, TCL_INDEX_NONE, 0, &underline);

if (code == TCL_OK) {

if (underline < INT_MIN) {

underline = INT_MIN;

} else if (underline > INT_MAX) {

underline = INT_MAX;

}

*underlinePtr = (int)underline;

} else {

Tcl_AppendResult(interp, "bad index \"", value,

"\": must be integer?[+-]integer?, end?[+-]integer?, or \"\"", (char *)NULL);

}

return code;

}

static const char *

UnderlinePrintProc(

TCL_UNUSED(void *),

TCL_UNUSED(Tk_Window), /* Window containing canvas widget. */

char *widgRec, /* Pointer to record for item. */

Tcl_Size offset, /* Pointer to record for item. */

Tcl_FreeProc **freeProcPtr) /* Pointer to variable to fill in with

* information about how to reclaim storage

* for return string. */

{

int underline = *(int *)(widgRec + offset);

char *p;

if (underline == INT_MIN) {

p = (char *)"";

*freeProcPtr = TCL_STATIC;

return p;

} else if (underline == INT_MAX) {

p = (char *)"end+1";

*freeProcPtr = TCL_STATIC;

return p;

} else if (underline == -1) {

p = (char *)"end";

*freeProcPtr = TCL_STATIC;

return p;

}

p = (char *)ckalloc(32);

if (underline < 0) {

snprintf(p, 32, "end%d", 1 + underline);

} else {

snprintf(p, 32, "%d", underline);

}

*freeProcPtr = TCL_DYNAMIC;

return p;

}

static const Tk_CustomOption underlineOption = {

UnderlineParseProc, UnderlinePrintProc, NULL

};

static const Tk_ConfigSpec configSpecs[] = {

{TK_CONFIG_COLOR, "-activefill", NULL, NULL,

NULL, offsetof(TextItem, activeColor), TK_CONFIG_NULL_OK, NULL},

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

NULL, offsetof(TextItem, activeStipple), TK_CONFIG_NULL_OK, NULL},

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

"center", offsetof(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT, NULL},

{TK_CONFIG_DOUBLE, "-angle", NULL, NULL,

"0.0", offsetof(TextItem, angle), TK_CONFIG_DONT_SET_DEFAULT, NULL},

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

NULL, offsetof(TextItem, disabledColor), TK_CONFIG_NULL_OK, NULL},

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

NULL, offsetof(TextItem, disabledStipple), TK_CONFIG_NULL_OK, NULL},

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

DEF_CANVITEM_OUTLINE, offsetof(TextItem, color), TK_CONFIG_NULL_OK, NULL},

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

DEF_CANVTEXT_FONT, offsetof(TextItem, tkfont), 0, NULL},

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

"left", offsetof(TextItem, justify), TK_CONFIG_DONT_SET_DEFAULT, NULL},

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

"0,0", offsetof(TextItem, tsoffset),

TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},

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

NULL, offsetof(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},

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

NULL, offsetof(TextItem, stipple), TK_CONFIG_NULL_OK, NULL},

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

NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},

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

"", offsetof(TextItem, textObj), TK_CONFIG_OBJS|TK_CONFIG_NULL_OK, NULL},

{TK_CONFIG_CUSTOM, "-underline", NULL, NULL, NULL,

offsetof(TextItem, underline), TK_CONFIG_NULL_OK, &underlineOption},

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

"0", offsetof(TextItem, widthObj), TK_CONFIG_OBJS, NULL},

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

};

/*

* 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, Tcl_Size objc,

Tcl_Obj *const objv[], int flags);

static int CreateText(Tcl_Interp *interp,

Tk_Canvas canvas, struct Tk_Item *itemPtr,

Tcl_Size objc, 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 Tcl_Size GetSelText(Tk_Canvas canvas,

Tk_Item *itemPtr, Tcl_Size offset, char *buffer,

Tcl_Size maxBytes);

static int GetTextIndex(Tcl_Interp *interp,

Tk_Canvas canvas, Tk_Item *itemPtr,

Tcl_Obj *obj, Tcl_Size *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, Tcl_Size index);

static int TextCoords(Tcl_Interp *interp,

Tk_Canvas canvas, Tk_Item *itemPtr,

Tcl_Size objc, Tcl_Obj *const objv[]);

static void TextDeleteChars(Tk_Canvas canvas,

Tk_Item *itemPtr, Tcl_Size first, Tcl_Size last);

static void TextInsert(Tk_Canvas canvas,

Tk_Item *itemPtr, Tcl_Size beforeThis, Tcl_Obj *obj);

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 RotateText(Tk_Canvas canvas, Tk_Item *itemPtr,

double originX, double originY, double angleRad);

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 */

0, /* flags */

TextToPoint, /* pointProc */

TextToArea, /* areaProc */

TextToPostscript, /* postscriptProc */

ScaleText, /* scaleProc */

TranslateText, /* translateProc */

GetTextIndex, /* indexProc */

SetTextCursor, /* icursorProc */

GetSelText, /* selectionProc */

TextInsert, /* insertProc */

TextDeleteChars, /* dTextProc */

NULL, /* nextPtr */

RotateText, /* rotateProc */

0, NULL, NULL

};

#define ROUND(d) ((int) floor((d) + 0.5))



/*

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

*

* 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. */

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

Tcl_Obj *const objv[]) /* Arguments describing rectangle. */

{

TextItem *textPtr = (TextItem *) itemPtr;

Tcl_Size i;

if (objc == 0) {

Tcl_Panic("canvas did not pass any coords");

}

/*

* 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->textObj = NULL;

textPtr->widthObj = NULL;

textPtr->underline = INT_MIN;

textPtr->angle = 0.0;

textPtr->textLayout = NULL;

textPtr->actualWidth = 0;

textPtr->drawOrigin[0] = textPtr->drawOrigin[1] = 0.0;

textPtr->gc = NULL;

textPtr->selTextGC = NULL;

textPtr->cursorOffGC = NULL;

textPtr->sine = 0.0;

textPtr->cosine = 1.0;

/*

* 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 {

const 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. */

Tcl_Size 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);

return TCL_OK;

} else if (objc > 2) {

Tcl_SetObjResult(interp, Tcl_ObjPrintf(

"wrong # coordinates: expected 0 or 2, got %" TCL_SIZE_MODIFIER "d", objc));

Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "TEXT", (char *)NULL);

return TCL_ERROR;

}

if (objc == 1) {

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

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

return TCL_ERROR;

} else if (objc != 2) {

Tcl_SetObjResult(interp, Tcl_ObjPrintf(

"wrong # coordinates: expected 2, got %" TCL_SIZE_MODIFIER "d", objc));

Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "TEXT", (char *)NULL);

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);

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. */

Tcl_Size 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,

objv, textPtr, flags)) {

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 = Canvas(canvas)->canvas_state;

}

color = textPtr->color;

stipple = textPtr->stipple;

if (Canvas(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 = NULL;

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;

}

if (textInfoPtr->selFgColorPtr != NULL) {

gcValues.foreground = textInfoPtr->selFgColorPtr->pixel;

}

newSelGC = Tk_GetGC(tkwin, mask|GCForeground, &gcValues);

}

if (textPtr->gc != NULL) {

Tk_FreeGC(Tk_Display(tkwin), textPtr->gc);

}

textPtr->gc = newGC;

if (textPtr->selTextGC != NULL) {

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 = NULL;

}

if (textPtr->cursorOffGC != NULL) {

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.

*/

Tcl_Size numChars = textPtr->textObj ? Tcl_GetCharLength(textPtr->textObj) : 0;

if (textInfoPtr->selItemPtr == itemPtr) {

if (textInfoPtr->selectFirst >= numChars) {

textInfoPtr->selItemPtr = NULL;

} else {

if (textInfoPtr->selectLast >= numChars) {

textInfoPtr->selectLast = numChars - 1;

}

if ((textInfoPtr->anchorItemPtr == itemPtr)

&& (textInfoPtr->selectAnchor >= numChars)) {

textInfoPtr->selectAnchor = numChars - 1;

}

}

}

if (textPtr->insertPos >= numChars) {

textPtr->insertPos = numChars;

}

/*

* Restrict so that 0.0 <= angle < 360.0, and then recompute the cached

* sine and cosine of the angle. Note that fmod() can produce negative

* results, and we try to avoid negative zero as well.

*/

textPtr->angle = fmod(textPtr->angle, 360.0);

if (textPtr->angle < 0.0) {

textPtr->angle += 360.0;

}

if (textPtr->angle == 0.0) {

textPtr->angle = 0.0;

}

textPtr->sine = sin(textPtr->angle * PI/180.0);

textPtr->cosine = cos(textPtr->angle * PI/180.0);

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(

TCL_UNUSED(Tk_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->textObj != NULL) {

Tcl_DecrRefCount(textPtr->textObj);

}

Tk_FreeTextLayout(textPtr->textLayout);

if (textPtr->gc != NULL) {

Tk_FreeGC(display, textPtr->gc);

}

if (textPtr->selTextGC != NULL) {

Tk_FreeGC(display, textPtr->selTextGC);

}

if (textPtr->cursorOffGC != NULL) {

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 width, height, fudge, i;

Tk_State state = textPtr->header.state;

double x[4], y[4], dx[4], dy[4], sinA, cosA, tmp;

if (state == TK_STATE_NULL) {

state = Canvas(canvas)->canvas_state;

}

Tk_FreeTextLayout(textPtr->textLayout);

width = 0;

if (textPtr->widthObj) {

Tk_GetPixelsFromObj(NULL, Tk_CanvasTkwin(canvas), textPtr->widthObj, &width);

}

Tcl_Size numChars = textPtr->textObj ? Tcl_GetCharLength(textPtr->textObj) : 0;

textPtr->textLayout = Tk_ComputeTextLayout(textPtr->tkfont,

(textPtr->textObj ? Tcl_GetString(textPtr->textObj) : ""), numChars, 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.

*/

for (i=0 ; i<4 ; i++) {

dx[i] = dy[i] = 0.0;

}

switch (textPtr->anchor) {

case TK_ANCHOR_NW:

case TK_ANCHOR_N:

case TK_ANCHOR_NE:

break;

case TK_ANCHOR_SW:

case TK_ANCHOR_S:

case TK_ANCHOR_SE:

for (i=0 ; i<4 ; i++) {

dy[i] = -height;

}

break;

default:

for (i=0 ; i<4 ; i++) {

dy[i] = -height / 2;

}

break;

}

switch (textPtr->anchor) {

case TK_ANCHOR_NW:

case TK_ANCHOR_W:

case TK_ANCHOR_SW:

break;

case TK_ANCHOR_NE:

case TK_ANCHOR_E:

case TK_ANCHOR_SE:

for (i=0 ; i<4 ; i++) {

dx[i] = -width;

}

break;

default:

for (i=0 ; i<4 ; i++) {

dx[i] = -width / 2;

}

break;

}

textPtr->actualWidth = width;

sinA = textPtr->sine;

cosA = textPtr->cosine;

textPtr->drawOrigin[0] = textPtr->x + dx[0]*cosA + dy[0]*sinA;

textPtr->drawOrigin[1] = textPtr->y + dy[0]*cosA - dx[0]*sinA;

/*

* 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;

Tk_GetPixelsFromObj(NULL, Tk_CanvasTkwin(canvas), (Tcl_Obj *)textInfoPtr->reserved2, &textInfoPtr->insertWidth);

Tk_GetPixelsFromObj(NULL, Tk_CanvasTkwin(canvas), (Tcl_Obj *)textInfoPtr->reserved3, &textInfoPtr->selBorderWidth);

fudge = (textInfoPtr->insertWidth + 1) / 2;

if (textInfoPtr->selBorderWidth > fudge) {

fudge = textInfoPtr->selBorderWidth;

}

/*

* Apply the rotation before computing the bounding box.

*/

dx[0] -= fudge;

dx[1] += width + fudge;

dx[2] += width + fudge;

dy[2] += height;

dx[3] -= fudge;

dy[3] += height;

for (i=0 ; i<4 ; i++) {

x[i] = textPtr->x + dx[i] * cosA + dy[i] * sinA;

y[i] = textPtr->y + dy[i] * cosA - dx[i] * sinA;

}

/*

* Convert to a rectilinear bounding box.

*/

for (i=1,tmp=x[0] ; i<4 ; i++) {

if (x[i] < tmp) {

tmp = x[i];

}

}

textPtr->header.x1 = ROUND(tmp);

for (i=1,tmp=y[0] ; i<4 ; i++) {

if (y[i] < tmp) {

tmp = y[i];

}

}

textPtr->header.y1 = ROUND(tmp);

for (i=1,tmp=x[0] ; i<4 ; i++) {

if (x[i] > tmp) {

tmp = x[i];

}

}

textPtr->header.x2 = ROUND(tmp);

for (i=1,tmp=y[0] ; i<4 ; i++) {

if (y[i] > tmp) {

tmp = y[i];

}

}

textPtr->header.y2 = ROUND(tmp);

}



/*

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

*

* 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;

Tcl_Size selFirstChar, selLastChar;

short drawableX, drawableY;

Pixmap stipple;

Tk_State state = itemPtr->state;

textPtr = (TextItem *) itemPtr;

textInfoPtr = textPtr->textInfoPtr;

if (state == TK_STATE_NULL) {

state = Canvas(canvas)->canvas_state;

}

stipple = textPtr->stipple;

if (Canvas(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 == NULL) {

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 = TCL_INDEX_NONE;

selLastChar = 0;

Tk_CanvasDrawableCoords(canvas, textPtr->drawOrigin[0],

textPtr->drawOrigin[1], &drawableX, &drawableY);

Tcl_Size numChars = textPtr->textObj ? Tcl_GetCharLength(textPtr->textObj) : 0;

if (textInfoPtr->selItemPtr == itemPtr) {

selFirstChar = textInfoPtr->selectFirst;

selLastChar = textInfoPtr->selectLast;

if (selLastChar > numChars) {

selLastChar = 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;

Tk_GetPixelsFromObj(NULL, Tk_CanvasTkwin(canvas), (Tcl_Obj *)textInfoPtr->reserved3, &textInfoPtr->selBorderWidth);

for (y = yFirst ; y <= yLast; y += height) {

int dx1, dy1, dx2, dy2;

double s = textPtr->sine, c = textPtr->cosine;

XPoint points[4];

if (y == yLast) {

width = xLast + wLast - x;

} else {

width = textPtr->actualWidth - x;

}

dx1 = x - textInfoPtr->selBorderWidth;

dy1 = y;

dx2 = width + 2 * textInfoPtr->selBorderWidth;

dy2 = height;

points[0].x = (short)(drawableX + dx1*c + dy1*s);

points[0].y = (short)(drawableY + dy1*c - dx1*s);

points[1].x = (short)(drawableX + (dx1+dx2)*c + dy1*s);

points[1].y = (short)(drawableY + dy1*c - (dx1+dx2)*s);

points[2].x = (short)(drawableX + (dx1+dx2)*c + (dy1+dy2)*s);

points[2].y = (short)(drawableY + (dy1+dy2)*c - (dx1+dx2)*s);

points[3].x = (short)(drawableX + dx1*c + (dy1+dy2)*s);

points[3].y = (short)(drawableY + (dy1+dy2)*c - dx1*s);

Tk_Fill3DPolygon(Tk_CanvasTkwin(canvas), drawable,

textInfoPtr->selBorder, points, 4,

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)) {

int dx1, dy1, dx2, dy2;

double s = textPtr->sine, c = textPtr->cosine;

XPoint points[4];

Tk_GetPixelsFromObj(NULL, Tk_CanvasTkwin(canvas), (Tcl_Obj *)textInfoPtr->reserved2, &textInfoPtr->insertWidth);

dx1 = x - (textInfoPtr->insertWidth / 2);

dy1 = y;

dx2 = textInfoPtr->insertWidth;

dy2 = height;