/* * tkCanvText.c -- * * This file implements text items for canvas widgets. * * Copyright 1991-1992 Regents of the University of California. * Permission to use, copy, modify, and distribute this * software and its documentation for any purpose and without * fee is hereby granted, provided that the above copyright * notice appear in all copies. The University of California * makes no representations about the suitability of this * software for any purpose. It is provided "as is" without * express or implied warranty. */ #ifndef lint static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkCanvText.c,v 1.19 93/01/07 17:29:34 ouster Exp $ SPRITE (Berkeley)"; #endif #include #include "tkInt.h" #include "tkCanvas.h" #include "tkConfig.h" /* * One of the following structures is kept for each line of text * in a text item. It contains geometry and display information * for that line. */ typedef struct TextLine { char *firstChar; /* Pointer to the first character in this * line (in the "text" field of enclosing * text item). */ int numChars; /* Number of characters displayed in this * line. */ int totalChars; /* Total number of characters included as * part of this line (may include an extra * space character at the end that isn't * displayed). */ int x, y; /* Origin at which to draw line on screen * (in integer pixel units, but in canvas * coordinates, not screen coordinates). */ int x1, y1; /* Upper-left pixel that is part of text * line on screen (again, in integer canvas * pixel units). */ int x2, y2; /* Lower-left pixel that is part of text * line on screen (again, in integer canvas * pixel units). */ } TextLine; /* * 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. */ char *text; /* Text for item (malloc-ed). */ int numChars; /* Number of non-NULL characters in text. */ double x, y; /* Positioning point for text. */ Tk_Anchor anchor; /* Where to anchor text relative to (x,y). */ int width; /* Width of lines for word-wrap, pixels. * Zero means no word-wrap. */ Tk_Justify justify; /* Justification mode for text. */ int rightEdge; /* Pixel just to right of right edge of * area of text item. Used for selecting * up to end of line. */ XFontStruct *fontPtr; /* Font for drawing text. */ XColor *color; /* Color for text. */ Pixmap stipple; /* Stipple bitmap for text, or None. */ GC gc; /* Graphics context for drawing text. */ TextLine *linePtr; /* Pointer to array of structures describing * individual lines of text item (malloc-ed). */ int numLines; /* Number of structs at *linePtr. */ int insertPos; /* Insertion cursor is displayed just to left * of character with this index. */ GC selTextGC; /* Graphics context for selected text. */ } TextItem; /* * Information used for parsing configuration specs: */ static Tk_ConfigSpec configSpecs[] = { {TK_CONFIG_ANCHOR, "-anchor", (char *) NULL, (char *) NULL, "center", Tk_Offset(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL, "black", Tk_Offset(TextItem, color), 0}, {TK_CONFIG_FONT, "-font", (char *) NULL, (char *) NULL, "-Adobe-Helvetica-Bold-R-Normal--*-120-*", Tk_Offset(TextItem, fontPtr), 0}, {TK_CONFIG_JUSTIFY, "-justify", (char *) NULL, (char *) NULL, "left", Tk_Offset(TextItem, justify), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL, (char *) NULL, Tk_Offset(TextItem, stipple), TK_CONFIG_NULL_OK}, {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL, (char *) NULL, 0, TK_CONFIG_NULL_OK, &tkCanvasTagsOption}, {TK_CONFIG_STRING, "-text", (char *) NULL, (char *) NULL, "", Tk_Offset(TextItem, text), 0}, {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL, "0", Tk_Offset(TextItem, width), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, 0} }; /* * Prototypes for procedures defined in this file: */ static void ComputeTextBbox _ANSI_ARGS_((Tk_Canvas *canvasPtr, TextItem *textPtr)); static int ConfigureText _ANSI_ARGS_(( Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int argc, char **argv, int flags)); static int CreateText _ANSI_ARGS_((Tk_Canvas *canvasPtr, struct Tk_Item *itemPtr, int argc, char **argv)); static void DeleteText _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr)); static void DisplayText _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, Drawable dst)); static int GetSelText _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int offset, char *buffer, int maxBytes)); static int GetTextIndex _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, char *indexString, int *indexPtr)); static void LineToPostscript _ANSI_ARGS_((Tcl_Interp *interp, char *string, int numChars)); static void ScaleText _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, double originX, double originY, double scaleX, double scaleY)); static void SetTextCursor _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int index)); static int TextCoords _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int argc, char **argv)); static int TextDeleteChars _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int first, int last)); static int TextInsert _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, int beforeThis, char *string)); static int TextToArea _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, double *rectPtr)); static double TextToPoint _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, double *pointPtr)); static int TextToPostscript _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, Tk_PostscriptInfo *psInfoPtr)); static void TranslateText _ANSI_ARGS_((Tk_Canvas *canvasPtr, Tk_Item *itemPtr, double deltaX, double deltaY)); /* * The structures below defines the rectangle and oval item types * by means of procedures that can be invoked by generic item code. */ Tk_ItemType TkTextType = { "text", /* name */ sizeof(TextItem), /* itemSize */ CreateText, /* createProc */ configSpecs, /* configSpecs */ ConfigureText, /* configureProc */ TextCoords, /* coordProc */ DeleteText, /* deleteProc */ DisplayText, /* displayProc */ 0, /* alwaysRedraw */ TextToPoint, /* pointProc */ TextToArea, /* areaProc */ TextToPostscript, /* postscriptProc */ ScaleText, /* scaleProc */ TranslateText, /* translateProc */ GetTextIndex, /* indexProc */ SetTextCursor, /* icursorProc */ GetSelText, /* selectionProc */ TextInsert, /* insertProc */ TextDeleteChars, /* dTextProc */ (Tk_ItemType *) NULL /* nextPtr */ }; /* *-------------------------------------------------------------- * * CreateText -- * * This procedure is invoked to create a new text item * in a canvas. * * Results: * A standard Tcl return value. If an error occurred in * creating the item then an error message is left in * canvasPtr->interp->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(canvasPtr, itemPtr, argc, argv) register Tk_Canvas *canvasPtr; /* Canvas to hold new item. */ Tk_Item *itemPtr; /* Record to hold new item; header * has been initialized by caller. */ int argc; /* Number of arguments in argv. */ char **argv; /* Arguments describing rectangle. */ { register TextItem *textPtr = (TextItem *) itemPtr; if (argc < 2) { Tcl_AppendResult(canvasPtr->interp, "wrong # args: should be \"", Tk_PathName(canvasPtr->tkwin), "\" create text x y [options]", (char *) NULL); return TCL_ERROR; } /* * Carry out initialization that is needed in order to clean * up after errors during the the remainder of this procedure. */ textPtr->text = NULL; textPtr->anchor = TK_ANCHOR_CENTER; textPtr->width = 0; textPtr->justify = TK_JUSTIFY_LEFT; textPtr->fontPtr = NULL; textPtr->color = NULL; textPtr->stipple = None; textPtr->gc = None; textPtr->linePtr = NULL; textPtr->numLines = 0; textPtr->insertPos = 0; textPtr->selTextGC = None; /* * Process the arguments to fill in the item record. */ if ((TkGetCanvasCoord(canvasPtr, argv[0], &textPtr->x) != TCL_OK) || (TkGetCanvasCoord(canvasPtr, argv[1], &textPtr->y) != TCL_OK)) { return TCL_ERROR; } if (ConfigureText(canvasPtr, itemPtr, argc-2, argv+2, 0) != TCL_OK) { DeleteText(canvasPtr, itemPtr); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * TextCoords -- * * This procedure is invoked to process the "coords" widget * command on text items. See the user documentation for * details on what it does. * * Results: * Returns TCL_OK or TCL_ERROR, and sets canvasPtr->interp->result. * * Side effects: * The coordinates for the given item may be changed. * *-------------------------------------------------------------- */ static int TextCoords(canvasPtr, itemPtr, argc, argv) register Tk_Canvas *canvasPtr; /* Canvas containing item. */ Tk_Item *itemPtr; /* Item whose coordinates are to be * read or modified. */ int argc; /* Number of coordinates supplied in * argv. */ char **argv; /* Array of coordinates: x1, y1, * x2, y2, ... */ { register TextItem *textPtr = (TextItem *) itemPtr; if (argc == 0) { sprintf(canvasPtr->interp->result, "%g %g", textPtr->x, textPtr->y); } else if (argc == 2) { if ((TkGetCanvasCoord(canvasPtr, argv[0], &textPtr->x) != TCL_OK) || (TkGetCanvasCoord(canvasPtr, argv[1], &textPtr->y) != TCL_OK)) { return TCL_ERROR; } ComputeTextBbox(canvasPtr, textPtr); } else { sprintf(canvasPtr->interp->result, "wrong # coordinates: expected 0 or 2, got %d", argc); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * ConfigureText -- * * This procedure is invoked to configure various aspects * of a text item, such as its border and background colors. * * Results: * A standard Tcl result code. If an error occurs, then * an error message is left in canvasPtr->interp->result. * * Side effects: * Configuration information, such as colors and stipple * patterns, may be set for itemPtr. * *-------------------------------------------------------------- */ static int ConfigureText(canvasPtr, itemPtr, argc, argv, flags) Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Rectangle item to reconfigure. */ int argc; /* Number of elements in argv. */ char **argv; /* Arguments describing things to configure. */ int flags; /* Flags to pass to Tk_ConfigureWidget. */ { register TextItem *textPtr = (TextItem *) itemPtr; XGCValues gcValues; GC newGC, newSelGC; unsigned long mask; if (Tk_ConfigureWidget(canvasPtr->interp, canvasPtr->tkwin, configSpecs, argc, argv, (char *) textPtr, flags) != TCL_OK) { return TCL_ERROR; } /* * A few of the options require additional processing, such as * graphics contexts. */ textPtr->numChars = strlen(textPtr->text); newGC = newSelGC = None; if ((textPtr->color != NULL) && (textPtr->fontPtr != NULL)) { gcValues.foreground = textPtr->color->pixel; gcValues.font = textPtr->fontPtr->fid; mask = GCForeground|GCFont; if (textPtr->stipple != None) { gcValues.stipple = textPtr->stipple; gcValues.fill_style = FillStippled; mask |= GCForeground|GCStipple|GCFillStyle; } newGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues); gcValues.foreground = canvasPtr->selFgColorPtr->pixel; newSelGC = Tk_GetGC(canvasPtr->tkwin, mask, &gcValues); } if (textPtr->gc != None) { Tk_FreeGC(canvasPtr->display, textPtr->gc); } textPtr->gc = newGC; if (textPtr->selTextGC != None) { Tk_FreeGC(canvasPtr->display, textPtr->selTextGC); } textPtr->selTextGC = newSelGC; /* * If the text was changed, move the selection and insertion indices * to keep them inside the item. */ if (canvasPtr->selItemPtr == itemPtr) { if (canvasPtr->selectFirst >= textPtr->numChars) { canvasPtr->selItemPtr = NULL; } else { if (canvasPtr->selectLast >= textPtr->numChars) { canvasPtr->selectLast = textPtr->numChars-1; } if ((canvasPtr->anchorItemPtr == itemPtr) && (canvasPtr->selectAnchor >= textPtr->numChars)) { canvasPtr->selectAnchor = textPtr->numChars-1; } } } if (textPtr->insertPos >= textPtr->numChars) { textPtr->insertPos = textPtr->numChars; } ComputeTextBbox(canvasPtr, textPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * DeleteText -- * * This procedure is called to clean up the data structure * associated with a text item. * * Results: * None. * * Side effects: * Resources associated with itemPtr are released. * *-------------------------------------------------------------- */ static void DeleteText(canvasPtr, itemPtr) Tk_Canvas *canvasPtr; /* Info about overall canvas widget. */ Tk_Item *itemPtr; /* Item that is being deleted. */ { register TextItem *textPtr = (TextItem *) itemPtr; if (textPtr->text != NULL) { ckfree(textPtr->text); } if (textPtr->fontPtr != NULL) { Tk_FreeFontStruct(textPtr->fontPtr); } if (textPtr->color != NULL) { Tk_FreeColor(textPtr->color); } if (textPtr->stipple != None) { Tk_FreeBitmap(canvasPtr->display, textPtr->stipple); } if (textPtr->gc != None) { Tk_FreeGC(canvasPtr->display, textPtr->gc); } if (textPtr->linePtr != NULL) { ckfree((char *) textPtr->linePtr); } if (textPtr->selTextGC != None) { Tk_FreeGC(canvasPtr->display, textPtr->selTextGC); } } /* *-------------------------------------------------------------- * * ComputeTextBbox -- * * This procedure is invoked to compute the bounding box of * all the pixels that may be drawn as part of a text item. * In addition, it recomputes all of the geometry information * used to display a text item or check for mouse hits. * * Results: * None. * * Side effects: * The fields x1, y1, x2, and y2 are updated in the header * for itemPtr, and the linePtr structure is regenerated * for itemPtr. * *-------------------------------------------------------------- */ static void ComputeTextBbox(canvasPtr, textPtr) register Tk_Canvas *canvasPtr; /* Canvas that contains item. */ register TextItem *textPtr; /* Item whose bbos is to be * recomputed. */ { register TextLine *linePtr; #define MAX_LINES 100 char *lineStart[MAX_LINES]; int lineChars[MAX_LINES]; int linePixels[MAX_LINES]; int numLines, wrapPixels, maxLinePixels, leftX, topY, y; int lineHeight, i, fudge; char *p; XCharStruct *maxBoundsPtr = &textPtr->fontPtr->max_bounds; if (textPtr->linePtr != NULL) { ckfree((char *) textPtr->linePtr); textPtr->linePtr = NULL; } /* * Work through the text computing the starting point, number of * characters, and number of pixels in each line. */ p = textPtr->text; if (textPtr->width > 0) { wrapPixels = maxLinePixels = textPtr->width; } else { wrapPixels = 10000000; maxLinePixels = 0; } for (numLines = 0; (numLines < MAX_LINES); numLines++) { int numChars, numPixels; numChars = TkMeasureChars(textPtr->fontPtr, p, (textPtr->text + textPtr->numChars) - p, 0, wrapPixels, TK_WHOLE_WORDS|TK_AT_LEAST_ONE, &numPixels); if (numPixels > maxLinePixels) { maxLinePixels = numPixels; } lineStart[numLines] = p; lineChars[numLines] = numChars; linePixels[numLines] = numPixels; p += numChars; /* * Skip space character that terminates a line, if there is one. * In the case of multiple spaces, all but one will be displayed. * This is important to make sure the insertion cursor gets * displayed when it is in the middle of a multi-space. */ if (isspace(*p)) { p++; } else if (*p == 0) { /* * The code below is tricky. Putting the loop termination * here guarantees that there's a TextLine for the last * line of text, even if the line is empty (this can * also happen if the entire text item is empty). This is * needed so that we can display the insertion cursor on a * line even when it is empty. */ numLines++; break; } } /* * Use overall geometry information to compute the top-left corner * of the bounding box for the text item. */ leftX = textPtr->x + 0.5; topY = textPtr->y + 0.5; lineHeight = textPtr->fontPtr->ascent + textPtr->fontPtr->descent; 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 -= (lineHeight * numLines)/2; break; case TK_ANCHOR_SW: case TK_ANCHOR_S: case TK_ANCHOR_SE: topY -= lineHeight * numLines; 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 -= maxLinePixels/2; break; case TK_ANCHOR_NE: case TK_ANCHOR_E: case TK_ANCHOR_SE: leftX -= maxLinePixels; break; } textPtr->rightEdge = leftX + maxLinePixels; /* * Create the new TextLine array and fill it in using the geometry * information gathered already. */ if (numLines > 0) { textPtr->linePtr = (TextLine *) ckalloc((unsigned) (numLines * sizeof(TextLine))); } else { textPtr->linePtr = NULL; } textPtr->numLines = numLines; for (i = 0, linePtr = textPtr->linePtr, y = topY; i < numLines; i++, linePtr++, y += lineHeight) { linePtr->firstChar = lineStart[i]; linePtr->numChars = lineChars[i]; if (i == (numLines-1)) { linePtr->totalChars = linePtr->numChars; } else { linePtr->totalChars = lineStart[i+1] - lineStart[i]; } switch (textPtr->justify) { case TK_JUSTIFY_LEFT: case TK_JUSTIFY_FILL: linePtr->x = leftX; break; case TK_JUSTIFY_CENTER: linePtr->x = leftX + maxLinePixels/2 - linePixels[i]/2; break; case TK_JUSTIFY_RIGHT: linePtr->x = leftX + maxLinePixels - linePixels[i]; break; } linePtr->y = y + textPtr->fontPtr->ascent; linePtr->x1 = linePtr->x - maxBoundsPtr->lbearing; linePtr->y1 = y; linePtr->x2 = linePtr->x + linePixels[i] + maxBoundsPtr->rbearing - textPtr->fontPtr->min_bounds.rbearing; linePtr->y2 = linePtr->y + textPtr->fontPtr->descent - 1; } /* * 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). */ linePtr = textPtr->linePtr; textPtr->header.x1 = textPtr->header.x2 = leftX; textPtr->header.y1 = topY; textPtr->header.y2 = topY + numLines*lineHeight; for (linePtr = textPtr->linePtr, i = textPtr->numLines; i > 0; i--, linePtr++) { if (linePtr->x1 < textPtr->header.x1) { textPtr->header.x1 = linePtr->x1; } if (linePtr->x2 >= textPtr->header.x2) { textPtr->header.x2 = linePtr->x2 + 1; } } fudge = canvasPtr->insertWidth/2; if (canvasPtr->selBorderWidth > fudge) { fudge = canvasPtr->selBorderWidth; } textPtr->header.x1 -= fudge; textPtr->header.x2 += fudge; } /* *-------------------------------------------------------------- * * DisplayText -- * * This procedure is invoked to draw a text item in a given * drawable. * * Results: * None. * * Side effects: * ItemPtr is drawn in drawable using the transformation * information in canvasPtr. * *-------------------------------------------------------------- */ static void DisplayText(canvasPtr, itemPtr, drawable) register Tk_Canvas *canvasPtr; /* Canvas that contains item. */ Tk_Item *itemPtr; /* Item to be displayed. */ Drawable drawable; /* Pixmap or window in which to draw * item. */ { register TextItem *textPtr = (TextItem *) itemPtr; Display *display = Tk_Display(canvasPtr->tkwin); register TextLine *linePtr; int i, focusHere, insertX, insertIndex, lineIndex; int beforeSelect, inSelect, afterSelect, selStartX, selEndX; if (textPtr->gc == None) { return; } focusHere = (canvasPtr->focusItemPtr == itemPtr) && (canvasPtr->flags & GOT_FOCUS); for (linePtr = textPtr->linePtr, i = textPtr->numLines; i > 0; linePtr++, i--) { /* * If part or all of this line is selected, then draw a special * background under the selected part of the line. */ lineIndex = linePtr->firstChar - textPtr->text; if ((canvasPtr->selItemPtr != itemPtr) || (canvasPtr->selectLast < lineIndex) || (canvasPtr->selectFirst >= (lineIndex + linePtr->totalChars))) { beforeSelect = linePtr->numChars; inSelect = 0; } else { beforeSelect = canvasPtr->selectFirst - lineIndex; if (beforeSelect <= 0) { beforeSelect = 0; selStartX = linePtr->x; } else { (void) TkMeasureChars(textPtr->fontPtr, linePtr->firstChar, beforeSelect, 0, (int) 1000000, TK_PARTIAL_OK, &selStartX); selStartX += linePtr->x; } inSelect = canvasPtr->selectLast + 1 - (lineIndex + beforeSelect); /* * 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, hence the * "i != 1" check. */ if (inSelect >= (linePtr->totalChars - beforeSelect)) { inSelect = linePtr->numChars - beforeSelect; if (i != 1) { selEndX = textPtr->rightEdge; goto fillSelectBackground; } } (void) TkMeasureChars(textPtr->fontPtr, linePtr->firstChar + beforeSelect, inSelect, selStartX-linePtr->x, (int) 1000000, TK_PARTIAL_OK, &selEndX); selEndX += linePtr->x; fillSelectBackground: Tk_Fill3DRectangle(display, drawable, canvasPtr->selBorder, selStartX - canvasPtr->drawableXOrigin - canvasPtr->selBorderWidth, linePtr->y - canvasPtr->drawableYOrigin - textPtr->fontPtr->ascent, selEndX - selStartX + 2*canvasPtr->selBorderWidth, textPtr->fontPtr->ascent + textPtr->fontPtr->descent, canvasPtr->selBorderWidth, TK_RELIEF_RAISED); } /* * If the insertion cursor is in this line, 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 (focusHere) { insertIndex = textPtr->insertPos - (linePtr->firstChar - textPtr->text); if ((insertIndex >= 0) && (insertIndex <= linePtr->numChars)) { (void) TkMeasureChars(textPtr->fontPtr, linePtr->firstChar, insertIndex, 0, (int) 1000000, TK_PARTIAL_OK, &insertX); if (canvasPtr->flags & CURSOR_ON) { Tk_Fill3DRectangle(display, drawable, canvasPtr->insertBorder, linePtr->x - canvasPtr->drawableXOrigin + insertX - (canvasPtr->insertWidth)/2, linePtr->y - canvasPtr->drawableYOrigin - textPtr->fontPtr->ascent, canvasPtr->insertWidth, textPtr->fontPtr->ascent + textPtr->fontPtr->descent, canvasPtr->insertBorderWidth, TK_RELIEF_RAISED); } else if (Tk_GetColorModel(canvasPtr->tkwin) != TK_COLOR){ Tk_Fill3DRectangle(display, drawable, canvasPtr->bgBorder, linePtr->x - canvasPtr->drawableXOrigin + insertX - (canvasPtr->insertWidth)/2, linePtr->y - canvasPtr->drawableYOrigin - textPtr->fontPtr->ascent, canvasPtr->insertWidth, textPtr->fontPtr->ascent + textPtr->fontPtr->descent, 0, TK_RELIEF_FLAT); } } } /* * Display the text in three pieces: the part before the * selection, the selected part (which needs a different graphics * context), and the part after the selection. */ if (beforeSelect != 0) { TkDisplayChars(display, drawable, textPtr->gc, textPtr->fontPtr, linePtr->firstChar, beforeSelect, linePtr->x - canvasPtr->drawableXOrigin, linePtr->y - canvasPtr->drawableYOrigin, 0); } if (inSelect != 0) { TkDisplayChars(display, drawable, textPtr->selTextGC, textPtr->fontPtr, linePtr->firstChar + beforeSelect, inSelect, selStartX - canvasPtr->drawableXOrigin, linePtr->y - canvasPtr->drawableYOrigin, 0); } afterSelect = linePtr->numChars - beforeSelect - inSelect; if (afterSelect > 0) { TkDisplayChars(display, drawable, textPtr->gc, textPtr->fontPtr, linePtr->firstChar + beforeSelect + inSelect, afterSelect, selEndX - canvasPtr->drawableXOrigin, linePtr->y - canvasPtr->drawableYOrigin, 0); } } } /* *-------------------------------------------------------------- * * TextInsert -- * * Insert characters into a text item at a given position. * * Results: * Always returns TCL_OK. * * Side effects: * The text in the given item is modified. The cursor and * selection positions are also modified to reflect the * insertion. * *-------------------------------------------------------------- */ static int TextInsert(canvasPtr, itemPtr, beforeThis, string) Tk_Canvas *canvasPtr; /* Canvas containing text item. */ Tk_Item *itemPtr; /* Text item to be modified. */ int beforeThis; /* Index of character before which text is * to be inserted. */ char *string; /* New characters to be inserted. */ { register TextItem *textPtr = (TextItem *) itemPtr; int length; char *new; length = strlen(string); if (length == 0) { return TCL_OK; } if (beforeThis < 0) { beforeThis = 0; } if (beforeThis > textPtr->numChars) { beforeThis = textPtr->numChars; } new = (char *) ckalloc((unsigned) (textPtr->numChars + length + 1)); strncpy(new, textPtr->text, beforeThis); strcpy(new+beforeThis, string); strcpy(new+beforeThis+length, textPtr->text+beforeThis); ckfree(textPtr->text); textPtr->text = new; textPtr->numChars += length; /* * Inserting characters invalidates indices such as those for the * selection and cursor. Update the indices appropriately. */ if (canvasPtr->selItemPtr == itemPtr) { if (canvasPtr->selectFirst >= beforeThis) { canvasPtr->selectFirst += length; } if (canvasPtr->selectLast >= beforeThis) { canvasPtr->selectLast += length; } if ((canvasPtr->anchorItemPtr == itemPtr) && (canvasPtr->selectAnchor >= beforeThis)) { canvasPtr->selectAnchor += length; } } if (textPtr->insertPos >= beforeThis) { textPtr->insertPos += length; } ComputeTextBbox(canvasPtr, textPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * TextDeleteChars -- * * Delete one or more characters from a text item. * * Results: * Always returns TCL_OK. * * Side effects: * Characters between "first" and "last", inclusive, get * deleted from itemPtr, and things like the selection * position get updated. * *-------------------------------------------------------------- */ static int TextDeleteChars(canvasPtr, itemPtr, first, last) Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Item in which to delete characters. */ int first; /* Index of first character to delete. */ int last; /* Index of last character to delete. */ { register TextItem *textPtr = (TextItem *) itemPtr; int count; char *new; if (first < 0) { first = 0; } if (last >= textPtr->numChars) { last = textPtr->numChars-1; } if (first > last) { return TCL_OK; } count = last + 1 - first; new = ckalloc((unsigned) (textPtr->numChars + 1 - count)); strncpy(new, textPtr->text, first); strcpy(new+first, textPtr->text+last+1); ckfree(textPtr->text); textPtr->text = new; textPtr->numChars -= count; /* * Update indexes for the selection and cursor to reflect the * renumbering of the remaining characters. */ if (canvasPtr->selItemPtr == itemPtr) { if (canvasPtr->selectFirst > first) { canvasPtr->selectFirst -= count; if (canvasPtr->selectFirst < first) { canvasPtr->selectFirst = first; } } if (canvasPtr->selectLast >= first) { canvasPtr->selectLast -= count; if (canvasPtr->selectLast < (first-1)) { canvasPtr->selectLast = (first-1); } } if (canvasPtr->selectFirst > canvasPtr->selectLast) { canvasPtr->selItemPtr = NULL; } if ((canvasPtr->anchorItemPtr == itemPtr) && (canvasPtr->selectAnchor > first)) { canvasPtr->selectAnchor -= count; if (canvasPtr->selectAnchor < first) { canvasPtr->selectAnchor = first; } } } if (textPtr->insertPos > first) { textPtr->insertPos -= count; if (textPtr->insertPos < first) { textPtr->insertPos = first; } } ComputeTextBbox(canvasPtr, textPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * 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 arc. If the * point isn't inside the arc then the return value is the * distance from the point to the arc. * * Side effects: * None. * *-------------------------------------------------------------- */ /* ARGSUSED */ static double TextToPoint(canvasPtr, itemPtr, pointPtr) Tk_Canvas *canvasPtr; /* Canvas containing itemPtr. */ Tk_Item *itemPtr; /* Item to check against point. */ double *pointPtr; /* Pointer to x and y coordinates. */ { TextItem *textPtr = (TextItem *) itemPtr; register TextLine *linePtr; int i; double xDiff, yDiff, dist, minDist; /* * Treat each line in the text item as a rectangle, compute the * distance to that rectangle, and take the minimum of these * distances. Perform most of the calculations in integer pixel * units, since that's how the dimensions of the text are defined. */ minDist = -1.0; for (linePtr = textPtr->linePtr, i = textPtr->numLines; i > 0; linePtr++, i--) { /* * If the point is inside the line's rectangle, then can * return immediately. */ if ((pointPtr[0] >= linePtr->x1) && (pointPtr[0] <= linePtr->x2) && (pointPtr[1] >= linePtr->y1) && (pointPtr[1] <= linePtr->y2)) { return 0.0; } /* * Point is outside line's rectangle; compute distance to nearest * side. */ if (pointPtr[0] < linePtr->x1) { xDiff = linePtr->x1 - pointPtr[0]; } else if (pointPtr[0] > linePtr->x2) { xDiff = pointPtr[0] - linePtr->x2; } else { xDiff = 0; } if (pointPtr[1] < linePtr->y1) { yDiff = linePtr->y1 - pointPtr[1]; } else if (pointPtr[1] > linePtr->y2) { yDiff = pointPtr[1] - linePtr->y2; } else { yDiff = 0; } dist = hypot(xDiff, yDiff); if ((dist < minDist) || (minDist < 0.0)) { minDist = dist; } } return minDist; } /* *-------------------------------------------------------------- * * TextToArea -- * * This procedure is called to determine whether an item * lies entirely inside, entirely outside, or overlapping * a given rectangle. * * Results: * -1 is returned if the item is entirely outside the area * given by rectPtr, 0 if it overlaps, and 1 if it is entirely * inside the given area. * * Side effects: * None. * *-------------------------------------------------------------- */ /* ARGSUSED */ static int TextToArea(canvasPtr, itemPtr, rectPtr) Tk_Canvas *canvasPtr; /* 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 = (TextItem *) itemPtr; register TextLine *linePtr; int i, result; /* * Scan the lines one at a time, seeing whether each line is * entirely in, entirely out, or overlapping the rectangle. If * an overlap is detected, return immediately; otherwise wait * until all lines have been processed and see if they were all * inside or all outside. */ result = 0; for (linePtr = textPtr->linePtr, i = textPtr->numLines; i > 0; linePtr++, i--) { if ((rectPtr[2] < linePtr->x1) || (rectPtr[0] > linePtr->x2) || (rectPtr[3] < linePtr->y1) || (rectPtr[1] > linePtr->y2)) { if (result == 1) { return 0; } result = -1; continue; } if ((linePtr->x1 < rectPtr[0]) || (linePtr->x2 > rectPtr[2]) || (linePtr->y1 < rectPtr[1]) || (linePtr->y2 > rectPtr[3])) { return 0; } if (result == -1) { return 0; } result = 1; } return result; } /* *-------------------------------------------------------------- * * ScaleText -- * * This procedure is invoked to rescale a text item. * * Results: * None. * * Side effects: * Scales the position of the text, but not the size * of the font for the text. * *-------------------------------------------------------------- */ /* ARGSUSED */ static void ScaleText(canvasPtr, itemPtr, originX, originY, scaleX, scaleY) Tk_Canvas *canvasPtr; /* Canvas containing rectangle. */ Tk_Item *itemPtr; /* Rectangle to be scaled. */ double originX, originY; /* Origin about which to scale rect. */ double scaleX; /* Amount to scale in X direction. */ double scaleY; /* Amount to scale in Y direction. */ { register TextItem *textPtr = (TextItem *) itemPtr; textPtr->x = originX + scaleX*(textPtr->x - originX); textPtr->y = originY + scaleY*(textPtr->y - originY); ComputeTextBbox(canvasPtr, textPtr); return; } /* *-------------------------------------------------------------- * * TranslateText -- * * This procedure is called to move a text item by a * given amount. * * Results: * None. * * Side effects: * The position of the text item is offset by (xDelta, yDelta), * and the bounding box is updated in the generic part of the * item structure. * *-------------------------------------------------------------- */ static void TranslateText(canvasPtr, itemPtr, deltaX, deltaY) Tk_Canvas *canvasPtr; /* Canvas containing item. */ Tk_Item *itemPtr; /* Item that is being moved. */ double deltaX, deltaY; /* Amount by which item is to be * moved. */ { register TextItem *textPtr = (TextItem *) itemPtr; textPtr->x += deltaX; textPtr->y += deltaY; ComputeTextBbox(canvasPtr, 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 * canvasPtr->interp->result. * * Side effects: * None. * *-------------------------------------------------------------- */ static int GetTextIndex(canvasPtr, itemPtr, string, indexPtr) Tk_Canvas *canvasPtr; /* Canvas containing item. */ Tk_Item *itemPtr; /* Item for which the index is being * specified. */ char *string; /* Specification of a particular character * in itemPtr's text. */ int *indexPtr; /* Where to store converted index. */ { register TextItem *textPtr = (TextItem *) itemPtr; int length; length = strlen(string); if (string[0] == 'e') { if (strncmp(string, "end", length) == 0) { *indexPtr = textPtr->numChars; } else { badIndex: /* * Some of the paths here leave messages in * canvasPtr->interp->result, so we have to clear it out * before storing our own message. */ Tcl_SetResult(canvasPtr->interp, (char *) NULL, TCL_STATIC); Tcl_AppendResult(canvasPtr->interp, "bad index \"", string, "\"", (char *) NULL); return TCL_ERROR; } } else if (string[0] == 'i') { if (strncmp(string, "insert", length) == 0) { *indexPtr = textPtr->insertPos; } else { goto badIndex; } } else if (string[0] == 's') { if (canvasPtr->selItemPtr != itemPtr) { canvasPtr->interp->result = "selection isn't in item"; return TCL_ERROR; } if (length < 5) { goto badIndex; } if (strncmp(string, "sel.first", length) == 0) { *indexPtr = canvasPtr->selectFirst; } else if (strncmp(string, "sel.last", length) == 0) { *indexPtr = canvasPtr->selectLast; } else { goto badIndex; } } else if (string[0] == '@') { int x, y, dummy, i; char *end, *p; register TextLine *linePtr; p = string+1; x = strtol(p, &end, 0); if ((end == p) || (*end != ',')) { goto badIndex; } p = end+1; y = strtol(p, &end, 0); if ((end == p) || (*end != 0)) { goto badIndex; } if ((textPtr->numChars == 0) || (y < textPtr->linePtr[0].y1)) { *indexPtr = 0; return TCL_OK; } for (i = 0, linePtr = textPtr->linePtr; ; i++, linePtr++) { if (i >= textPtr->numLines) { *indexPtr = textPtr->numChars; return TCL_OK; } if (y <= linePtr->y2) { break; } } *indexPtr = TkMeasureChars(textPtr->fontPtr, linePtr->firstChar, linePtr->numChars, linePtr->x, x, 0, &dummy); *indexPtr += linePtr->firstChar - textPtr->text; } else { if (Tcl_GetInt(canvasPtr->interp, string, indexPtr) != TCL_OK) { goto badIndex; } if (*indexPtr < 0){ *indexPtr = 0; } else if (*indexPtr > textPtr->numChars) { *indexPtr = textPtr->numChars; } } 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(canvasPtr, itemPtr, index) Tk_Canvas *canvasPtr; /* Record describing canvas widget. */ Tk_Item *itemPtr; /* Text item in which cursor position * is to be set. */ int index; /* Index of character just before which * cursor is to be positioned. */ { register TextItem *textPtr = (TextItem *) itemPtr; if (index < 0) { textPtr->insertPos = 0; } else if (index > textPtr->numChars) { textPtr->insertPos = textPtr->numChars; } else { textPtr->insertPos = index; } } /* *-------------------------------------------------------------- * * GetSelText -- * * This procedure is invoked to return the selected portion * of a text item. It is only called when this item has * the selection. * * Results: * The return value is the number of non-NULL bytes stored * at buffer. Buffer is filled (or partially filled) with a * NULL-terminated string containing part or all of the selection, * as given by offset and maxBytes. * * Side effects: * None. * *-------------------------------------------------------------- */ static int GetSelText(canvasPtr, itemPtr, offset, buffer, maxBytes) Tk_Canvas *canvasPtr; /* Canvas containing selection. */ Tk_Item *itemPtr; /* Text item containing selection. */ int offset; /* Offset within selection of first * character to be returned. */ char *buffer; /* Location in which to place * selection. */ int maxBytes; /* Maximum number of bytes to place * at buffer, not including terminating * NULL character. */ { TextItem *textPtr = (TextItem *) itemPtr; int count; count = canvasPtr->selectLast + 1 - canvasPtr->selectFirst - offset; if (canvasPtr->selectLast == textPtr->numChars) { count -= 1; } if (count > maxBytes) { count = maxBytes; } if (count <= 0) { return 0; } strncpy(buffer, textPtr->text + canvasPtr->selectFirst + offset, count); buffer[count] = '\0'; return count; } /* *-------------------------------------------------------------- * * TextToPostscript -- * * This procedure is called to generate Postscript for * text items. * * Results: * The return value is a standard Tcl result. If an error * occurs in generating Postscript then an error message is * left in canvasPtr->interp->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(canvasPtr, itemPtr, psInfoPtr) Tk_Canvas *canvasPtr; /* Information about overall canvas. */ Tk_Item *itemPtr; /* Item for which Postscript is * wanted. */ Tk_PostscriptInfo *psInfoPtr; /* Information about the Postscript; * must be passed back to Postscript * utility procedures. */ { register TextItem *textPtr = (TextItem *) itemPtr; register TextLine *linePtr; int i; char *xoffset = NULL, *yoffset = NULL; /* Initializations needed */ char *justify = NULL; /* only to stop compiler * warnings. */ char buffer[500]; if (textPtr->color == NULL) { return TCL_OK; } if (TkCanvPsFont(canvasPtr, psInfoPtr, textPtr->fontPtr) != TCL_OK) { return TCL_ERROR; } if (TkCanvPsColor(canvasPtr, psInfoPtr, textPtr->color) != TCL_OK) { return TCL_ERROR; } sprintf(buffer, "%g %g [\n", textPtr->x, TkCanvPsY(psInfoPtr, textPtr->y)); Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL); for (i = textPtr->numLines, linePtr = textPtr->linePtr; i > 0; i--, linePtr++) { Tcl_AppendResult(canvasPtr->interp, " ", (char *) NULL); LineToPostscript(canvasPtr->interp, linePtr->firstChar, linePtr->numChars); Tcl_AppendResult(canvasPtr->interp, "\n", (char *) NULL); } switch (textPtr->anchor) { case TK_ANCHOR_NW: xoffset = "0"; yoffset = "0"; break; case TK_ANCHOR_N: xoffset = "-0.5"; yoffset = "0"; break; case TK_ANCHOR_NE: xoffset = "-1"; yoffset = "0"; break; case TK_ANCHOR_E: xoffset = "-1"; yoffset = "0.5"; break; case TK_ANCHOR_SE: xoffset = "-1"; yoffset = "1"; break; case TK_ANCHOR_S: xoffset = "-0.5"; yoffset = "1"; break; case TK_ANCHOR_SW: xoffset = "0"; yoffset = "1"; break; case TK_ANCHOR_W: xoffset = "0"; yoffset = "0.5"; break; case TK_ANCHOR_CENTER: xoffset = "-0.5"; yoffset = "0.5"; break; } switch (textPtr->justify) { case TK_JUSTIFY_LEFT: justify = "0"; break; case TK_JUSTIFY_FILL: case TK_JUSTIFY_CENTER: justify = "0.5"; break; case TK_JUSTIFY_RIGHT: justify = "1"; break; } sprintf(buffer, "] %d %s %s %s () false DrawText\n", textPtr->fontPtr->ascent + textPtr->fontPtr->descent, xoffset, yoffset, justify); Tcl_AppendResult(canvasPtr->interp, buffer, (char *) NULL); return TCL_OK; } /* *-------------------------------------------------------------- * * LineToPostscript -- * * This procedure generates a parenthesized Postscript string * describing one line of text from a text item. * * Results: * None. The parenthesized string is appended to * interp->result. It generates proper backslash notation so * that Postscript can interpret the string correctly. * * Side effects: * None. * *-------------------------------------------------------------- */ static void LineToPostscript(interp, string, numChars) Tcl_Interp *interp; /* Interp whose result is to be appended to. */ register char *string; /* String to Postscript-ify. */ int numChars; /* Number of characters in the string. */ { #define BUFFER_SIZE 100 char buffer[BUFFER_SIZE+5]; int used, c; buffer[0] = '('; used = 1; for ( ; numChars > 0; string++, numChars--) { c = (*string) & 0xff; if ((c == '(') || (c == ')') || (c == '\\') || (c < 0x20) || (c >= 0x7f)) { sprintf(buffer+used, "\\%o", c); used += strlen(buffer+used); } else { buffer[used] = c; used++; } if (used >= BUFFER_SIZE) { buffer[used] = 0; Tcl_AppendResult(interp, buffer, (char *) NULL); used = 0; } } buffer[used] = ')'; buffer[used+1] = 0; Tcl_AppendResult(interp, buffer, (char *) NULL); }