/* * 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" /* * 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. */ TkSizeT 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 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. */ TkSizeT numChars; /* Length of text in characters. */ TkSizeT numBytes; /* Length of text in bytes. */ 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 = { TkCanvasTagsParseProc, TkCanvasTagsPrintProc, NULL }; static const Tk_CustomOption offsetOption = { TkOffsetParseProc, TkOffsetPrintProc, INT2PTR(TK_OFFSET_RELATIVE) }; static int UnderlineParseProc( ClientData dummy, /* Not used.*/ Tcl_Interp *interp, /* Used for reporting errors. */ Tk_Window tkwin, /* Window containing canvas widget. */ const char *value, /* Value of option. */ char *widgRec, /* Pointer to record for item. */ TkSizeT offset) /* Offset into item (ignored). */ { int *underlinePtr = (int *) (widgRec + offset); Tcl_Obj obj; int code; TkSizeT underline; (void)dummy; (void)tkwin; if (value == NULL || *value == 0) { *underlinePtr = INT_MIN; /* No underline */ return TCL_OK; } obj.refCount = 1; obj.bytes = (char *)value; obj.length = strlen(value); obj.typePtr = NULL; code = TkGetIntForIndex(&obj, TCL_INDEX_END, 0, &underline); if (code == TCL_OK) { if (underline == TCL_INDEX_NONE) { underline = INT_MIN; } else if ((size_t)underline > (size_t)TCL_INDEX_END>>1) { underline++; } else if (underline >= INT_MAX) { underline = INT_MAX; } *underlinePtr = underline; } else { Tcl_AppendResult(interp, "bad index \"", value, "\": must be integer?[+-]integer?, end?[+-]integer?, or \"\"", NULL); } return code; } const char * UnderlinePrintProc( ClientData dummy, /* Ignored. */ Tk_Window tkwin, /* Window containing canvas widget. */ char *widgRec, /* Pointer to record for item. */ TkSizeT 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; (void)dummy; (void)tkwin; if (underline == INT_MIN) { #if !defined(TK_NO_DEPRECATED) && TK_MAJOR_VERSION < 9 p = (char *)"-1"; #else p = (char *)""; #endif *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) { sprintf(p, "end%d", underline); } else { sprintf(p, "%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, text), 0, 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, width), TK_CONFIG_DONT_SET_DEFAULT, 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, 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 TkSizeT GetSelText(Tk_Canvas canvas, Tk_Item *itemPtr, TkSizeT offset, char *buffer, TkSizeT maxBytes); static int GetTextIndex(Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, Tcl_Obj *obj, TkSizeT *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, TkSizeT 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, TkSizeT first, TkSizeT last); static void TextInsert(Tk_Canvas canvas, Tk_Item *itemPtr, TkSizeT 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 */ TK_CONFIG_OBJS, /* 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. */ 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"); } /* * 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 = INT_MIN; textPtr->angle = 0.0; textPtr->numChars = 0; textPtr->numBytes = 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. */ 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); return TCL_OK; } else if (objc > 2) { Tcl_SetObjResult(interp, Tcl_ObjPrintf( "wrong # coordinates: expected 0 or 2, got %d", objc)); Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "TEXT", 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 %d", objc)); Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "TEXT", 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. */ 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 = 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. */ textPtr->numBytes = strlen(textPtr->text); textPtr->numChars = Tcl_NumUtfChars(textPtr->text, textPtr->numBytes); if (textInfoPtr->selItemPtr == itemPtr) { if (textInfoPtr->selectFirst + 1 >= textPtr->numChars + 1) { textInfoPtr->selItemPtr = NULL; } else { if (textInfoPtr->selectLast + 1 >= textPtr->numChars + 1) { textInfoPtr->selectLast = textPtr->numChars - 1; } if ((textInfoPtr->anchorItemPtr == itemPtr) && (textInfoPtr->selectAnchor + 1 >= textPtr->numChars + 1)) { textInfoPtr->selectAnchor = textPtr->numChars - 1; } } } if (textPtr->insertPos + 1 >= textPtr->numChars + 1) { textPtr->insertPos = textPtr->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->text != NULL) { ckfree(textPtr->text); } 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); 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. */ 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; 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; TkSizeT 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); if (textInfoPtr->selItemPtr == itemPtr) { selFirstChar = textInfoPtr->selectFirst; selLastChar = textInfoPtr->selectLast; if (selLastChar + 1 > textPtr->numChars + 1 ) { selLastChar = textPtr->numChars - 1; } if (((int)selFirstChar >= 0) && (selFirstChar + 1 <= selLastChar + 1 )) { 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) { 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]; dx1 = x - (textInfoPtr->insertWidth / 2); dy1 = y; dx2 = textInfoPtr->insertWidth; 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_SetCaretPos(Tk_CanvasTkwin(canvas), points[0].x, points[0].y, height); if (textInfoPtr->cursorOn) { Tk_Fill3DPolygon(Tk_CanvasTkwin(canvas), drawable, textInfoPtr->insertBorder, points, 4, textInfoPtr->insertBorderWidth, TK_RELIEF_RAISED); } else if (textPtr->cursorOffGC != NULL) { /* * 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. */ XFillPolygon(display, drawable, textPtr->cursorOffGC, points, 4, Convex, CoordModeOrigin); } } } /* * 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. */ if ((selFirstChar != TCL_INDEX_NONE) && (textPtr->selTextGC != textPtr->gc)) { if (0 < selFirstChar) { TkDrawAngledTextLayout(display, drawable, textPtr->gc, textPtr->textLayout, drawableX, drawableY, textPtr->angle, 0, selFirstChar); } TkDrawAngledTextLayout(display, drawable, textPtr->selTextGC, textPtr->textLayout, drawableX, drawableY, textPtr->angle, selFirstChar, selLastChar + 1); if (selLastChar + 1 < textPtr->numChars) { TkDrawAngledTextLayout(display, drawable, textPtr->gc, textPtr->textLayout, drawableX, drawableY, textPtr->angle, selLastChar + 1, textPtr->numChars); } } else { TkDrawAngledTextLayout(display, drawable, textPtr->gc, textPtr->textLayout, drawableX, drawableY, textPtr->angle, 0, textPtr->numChars); } TkUnderlineAngledTextLayout(display, drawable, textPtr->gc, textPtr->textLayout, drawableX, drawableY, textPtr->angle, 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. */ TkSizeT index, /* Character index before which string is to * be inserted. */ Tcl_Obj *obj) /* New characters to be inserted. */ { TextItem *textPtr = (TextItem *) itemPtr; int byteIndex, charsAdded; TkSizeT byteCount; char *newStr, *text; const char *string; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; string = Tcl_GetStringFromObj(obj, &byteCount); text = textPtr->text; if (index == TCL_INDEX_NONE) { index = 0; } if (index + 1 > textPtr->numChars + 1) { index = textPtr->numChars; } byteIndex = Tcl_UtfAtIndex(text, index) - text; byteCount = strlen(string); if (byteCount == 0) { return; } newStr = (char *)ckalloc(textPtr->numBytes + byteCount + 1); memcpy(newStr, text, 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 + 1 >= index + 1) { textInfoPtr->selectFirst += charsAdded; } if (textInfoPtr->selectLast + 1 >= index + 1) { textInfoPtr->selectLast += charsAdded; } if ((textInfoPtr->anchorItemPtr == itemPtr) && (textInfoPtr->selectAnchor + 1 >= index + 1)) { textInfoPtr->selectAnchor += charsAdded; } } if (textPtr->insertPos + 1 >= index + 1) { 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. */ TkSizeT first, /* Character index of first character to * delete. */ TkSizeT 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 ((int)first < 0) { first = 0; } if (last + 1 >= textPtr->numChars + 1) { last = textPtr->numChars - 1; } if (first + 1 > last + 1) { return; } charsRemoved = last + 1 - first; byteIndex = Tcl_UtfAtIndex(text, first) - text; byteCount = Tcl_UtfAtIndex(text + byteIndex, charsRemoved) - (text + byteIndex); newStr = (char *)ckalloc(textPtr->numBytes + 1 - byteCount); memcpy(newStr, text, 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 + 1 > first + 1) { textInfoPtr->selectFirst -= charsRemoved; if ((int)textInfoPtr->selectFirst + 1 < (int)first + 1) { textInfoPtr->selectFirst = first; } } if (textInfoPtr->selectLast + 1 >= first + 1) { textInfoPtr->selectLast -= charsRemoved; if (textInfoPtr->selectLast + 1 < first) { textInfoPtr->selectLast = first - 1; } } if ((int)textInfoPtr->selectFirst + 1 > (int)textInfoPtr->selectLast + 1) { textInfoPtr->selItemPtr = NULL; } if ((textInfoPtr->anchorItemPtr == itemPtr) && (textInfoPtr->selectAnchor + 1 > first + 1)) { textInfoPtr->selectAnchor -= charsRemoved; if (textInfoPtr->selectAnchor + 1 < first + 1) { textInfoPtr->selectAnchor = first; } } } if (textPtr->insertPos + 1 > first + 1) { textPtr->insertPos -= charsRemoved; if ((int)textPtr->insertPos + 1 < (int)first + 1) { 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, px, py; if (state == TK_STATE_NULL) { state = Canvas(canvas)->canvas_state; } textPtr = (TextItem *) itemPtr; px = pointPtr[0] - textPtr->drawOrigin[0]; py = pointPtr[1] - textPtr->drawOrigin[1]; value = (double) Tk_DistanceToTextLayout(textPtr->textLayout, (int) (px*textPtr->cosine - py*textPtr->sine), (int) (py*textPtr->cosine + px*textPtr->sine)); 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 = Canvas(canvas)->canvas_state; } textPtr = (TextItem *) itemPtr; return TkIntersectAngledTextLayout(textPtr->textLayout, (int) ((rectPtr[0] + 0.5) - textPtr->drawOrigin[0]), (int) ((rectPtr[1] + 0.5) - textPtr->drawOrigin[1]), (int) (rectPtr[2] - rectPtr[0] + 0.5), (int) (rectPtr[3] - rectPtr[1] + 0.5), textPtr->angle); } /* *-------------------------------------------------------------- * * RotateText -- * * This function is called to rotate a text item by a given amount about a * point. Note that this does *not* rotate the text of the item. * * Results: * None. * * Side effects: * The position of the text anchor is rotated by angleRad about (originX, * originY), and the bounding box is updated in the generic part of the * item structure. * *-------------------------------------------------------------- */ static void RotateText( Tk_Canvas canvas, /* Canvas containing item. */ Tk_Item *itemPtr, /* Item that is being rotated. */ double originX, double originY, double angleRad) /* Amount by which item is to be rotated. */ { TextItem *textPtr = (TextItem *) itemPtr; TkRotatePoint(originX, originY, sin(angleRad), cos(angleRad), &textPtr->x, &textPtr->y); ComputeTextBbox(canvas, textPtr); } /* *-------------------------------------------------------------- * * 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. * *-------------------------------------------------------------- */ 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. */ TCL_UNUSED(Tk_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. */ TkSizeT *indexPtr) /* Where to store converted character * index. */ { TextItem *textPtr = (TextItem *) itemPtr; TkSizeT length, idx; int c; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; const char *string; if (TCL_OK == TkGetIntForIndex(obj, textPtr->numChars - 1, 1, &idx)) { if (idx == TCL_INDEX_NONE) { idx = 0; } else if (idx > textPtr->numChars) { idx = textPtr->numChars; } *indexPtr = idx; return TCL_OK; } string = Tcl_GetStringFromObj(obj, &length); c = string[0]; if ((c == 'i') && (strncmp(string, "insert", length) == 0)) { *indexPtr = textPtr->insertPos; } else if ((c == 's') && (length >= 5) && (strncmp(string, "sel.first", length) == 0)) { if (textInfoPtr->selItemPtr != itemPtr) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "selection isn't in item", -1)); Tcl_SetErrorCode(interp, "TK", "CANVAS", "UNSELECTED", NULL); return TCL_ERROR; } *indexPtr = textInfoPtr->selectFirst; } else if ((c == 's') && (length >= 5) && (strncmp(string, "sel.last", length) == 0)) { if (textInfoPtr->selItemPtr != itemPtr) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "selection isn't in item", -1)); Tcl_SetErrorCode(interp, "TK", "CANVAS", "UNSELECTED", NULL); return TCL_ERROR; } *indexPtr = textInfoPtr->selectLast; } else if (c == '@') { int x, y; double tmp, cs = textPtr->cosine, s = textPtr->sine; char *end; const char *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); x -= (int) textPtr->drawOrigin[0]; y -= (int) textPtr->drawOrigin[1]; *indexPtr = Tk_PointToChar(textPtr->textLayout, (int) (x*cs - y*s), (int) (y*cs + x*s)); } 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_SetObjResult(interp, Tcl_ObjPrintf("bad index \"%s\"", string)); Tcl_SetErrorCode(interp, "TK", "CANVAS", "ITEM_INDEX", "TEXT", 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. * *-------------------------------------------------------------- */ static void SetTextCursor( TCL_UNUSED(Tk_Canvas), /* Record describing canvas widget. */ Tk_Item *itemPtr, /* Text item in which cursor position is to be * set. */ TkSizeT index) /* Character index of character just before * which cursor is to be positioned. */ { TextItem *textPtr = (TextItem *) itemPtr; if (index == TCL_INDEX_NONE) { 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 TkSizeT GetSelText( TCL_UNUSED(Tk_Canvas), /* Canvas containing selection. */ Tk_Item *itemPtr, /* Text item containing selection. */ TkSizeT offset, /* Byte offset within selection of first * character to be returned. */ char *buffer, /* Location in which to place selection. */ TkSizeT maxBytes) /* Maximum number of bytes to place at buffer, * not including terminating NULL * character. */ { TextItem *textPtr = (TextItem *) itemPtr; TkSizeT byteCount; char *text; const char *selStart, *selEnd; Tk_CanvasTextInfo *textInfoPtr = textPtr->textInfoPtr; if (((int)textInfoPtr->selectFirst < 0) || (textInfoPtr->selectFirst + 1 > textInfoPtr->selectLast + 1)) { return 0; } text = textPtr->text; selStart = Tcl_UtfAtIndex(text, textInfoPtr->selectFirst); selEnd = Tcl_UtfAtIndex(selStart, textInfoPtr->selectLast + 1 - textInfoPtr->selectFirst); if (selEnd <= selStart + offset) { return 0; } byteCount = selEnd - selStart - offset; if (byteCount > maxBytes) { byteCount = maxBytes; } memcpy(buffer, selStart + offset, 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; double x, y; Tk_FontMetrics fm; const char *justify; XColor *color; Pixmap stipple; Tk_State state = itemPtr->state; Tcl_Obj *psObj; Tcl_InterpState interpState; if (state == TK_STATE_NULL) { state = Canvas(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 (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; } } /* * Make our working space. */ psObj = Tcl_NewObj(); interpState = Tcl_SaveInterpState(interp, TCL_OK); /* * Generate postscript. */ Tcl_ResetResult(interp); if (Tk_CanvasPsFont(interp, canvas, textPtr->tkfont) != TCL_OK) { goto error; } Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); if (prepass != 0) { goto done; } Tcl_ResetResult(interp); Tk_CanvasPsColor(interp, canvas, color); Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); if (stipple != None) { Tcl_ResetResult(interp); Tk_CanvasPsStipple(interp, canvas, stipple); Tcl_AppendPrintfToObj(psObj, "/StippleText {\n %s} bind def\n", Tcl_GetString(Tcl_GetObjResult(interp))); } 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; default: x = 1; y = 1; break; } switch (textPtr->justify) { case TK_JUSTIFY_CENTER: justify = "0.5"; break; case TK_JUSTIFY_RIGHT: justify = "1"; break; default: justify = "0"; break; } Tk_GetFontMetrics(textPtr->tkfont, &fm); Tcl_AppendPrintfToObj(psObj, "%.15g %.15g %.15g [\n", textPtr->angle, textPtr->x, Tk_CanvasPsY(canvas, textPtr->y)); Tcl_ResetResult(interp); Tk_TextLayoutToPostscript(interp, textPtr->textLayout); Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp)); Tcl_AppendPrintfToObj(psObj, "] %d %g %g %s %s DrawText\n", fm.linespace, x / -2.0, y / 2.0, justify, ((stipple == None) ? "false" : "true")); /* * Plug the accumulated postscript back into the result. */ done: (void) Tcl_RestoreInterpState(interp, interpState); Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj); Tcl_DecrRefCount(psObj); return TCL_OK; error: Tcl_DiscardInterpState(interpState); Tcl_DecrRefCount(psObj); return TCL_ERROR; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */